[Elecraft] KAF2?
Does anyone have a KAF2 audio filter module that's surplus to their needs? Tnx, es 73 Eric -- W. Eric McFadden Athens, Ohio http://home.frognet.net/~mcfadden/wd8rif/radio.htm http://McFaddenPhoto.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KAF2
This is likely just operator error but after setting the date I am not able to set my RTC time. I am following the steps as outlined in the booklet but the time does change. Any ideas? Ed - AD7GR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2
Hi, I have an extra KAF2. Best Offer or Trade for something Elecraft. 73 Bob w7wo offline b...@kalkwarf.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Kaf2
My KAF2 has been sold. Thanks Scott N5SM _ More photos, more messages, more storageget 2GB with Windows Live Hotmail. http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migration_HM_mini_2G_0507 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2
Looking for a KAF2 for my K2 - any out there? Mike ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2
Looking for a KAF2 for a friend (W9LR) who just picked up a K2 S# 529. I've got some fixing to do to it for him and do the upgrades from A to B and the such. If you have a KAF2 for sale built or unbuilt let me know via direct email. Gregg R. Lengling, W9DHI, Retired Administrator http://www.milwaukeehdtv.org K2/100 S#3075 KX1 S# 57 Member: ARRL, RSGB, RCA, WERA and ORC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 Sold!
___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 wanted
Any surplus KAF2 audio filters anyone would want to part with, built or unbuilt? Barry __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KAF2 completed!
Just completed the KAF2 Audio Filter for my K2! Wow thats a nice addition to the radio! Keith Hamilton, W8GX Youngstown, OH __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KAF2 wanted
Dear All HNY.. Does anyone have a KAF2 surplus to requirements? Replies off list directly to me please. Thanks... 73 Marc G0AZS __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KAF2 sold
The KAF2 has been sold. Doug W6JD ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 faulty
My KAF2 has been working fine in my K2 for some years, not that I actually use it that much. Today I came into the shack to find no audio coming out of the K2 and when I tried to change the AFIL settings it said 'not installed'. I cannot change the RTC menu settings either. I have moved S1 on the KAF2 to bypass it and all is working fine so it seems there is a fault on the KAF2. The manual suggests this is a fault with the microcontroller, which of course it may well be, but are there any other known causes? I did think of the backup battery but not sure if this would cause issues outside the RTC, it measures just over 3V so a bit down. 73 Dave G3YMC http://davesergeant.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Elecraft KAF2
I have for sale a KAF2. C19 has been padded with both fixed and a variable capacitor so as to set the 32.768 KHz xtal to obtain precise time. Battery still good , checks at 3.042 VDC. Asking $55.00. Will ship CONUS. Gil K8EAG If interested please contact off list. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 wanted
Looking for a KAF2 that might be surplus to your needs. A friend of mine just purchased a K2 and is looking for the audio filter. Contact Len, K6LEC: [EMAIL PROTECTED] Thanks, Don Minkoff NK6A K2 K1 KX1 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 FS
I have an Elecraft KAF2, fully built, FS, $35 postpaid to US. Works FB- replaced it with KDSP2. Please contact off reflector. Dennis NB1B ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2-Assembly questions
I'm building the KAF2 Audio Filter. Two questions for whoever knows: 1. I mounted the two trimmer pots on the top side of the board even though their outline is on the bottom. Hope that's right, it didn't make sense to have an adjustable component on the bottom. 2. I'm about to mount the socket for U2 on top however its outline is also on the bottom. First instruction says, "If an assembly step does not specify top or bottom, the component should be installed on the top side." Can I take the manual at its word and put the U2 socket on the top? 73, Fred K6DGW - Northern California Contest Club - CU in the 2008 Cal QSO Party 4-5 Oct 08 - www.cqp.org ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 Built & Tested
For sale.yeah, I bought it AND the DSP.and it's built and tested and worked great. $65 mailed to the continental US. Email me off list @ [EMAIL PROTECTED] Ron, KE5QDA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2/KDSP2 impressions
Hi, If you get a chance, do you mind emailing me your impressions of the KAF2 vs the KDSP2? I'm interested in buying one or the other, and hoped to get the opinion of someone who has listened to both. Thanks, N5BCN, Brian __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 faulty
Further investigation shows the output of U4 78L06 regulator to be down to 1V. So it appears the 78L06 has failed and once I have found one I will change it. Thanks for the help. 73 Dave G3YMC On 6 Dec 2014 at 15:57, Dave Sergeant wrote: > My KAF2 has been working fine in my K2 for some years, not that I > actually use it that much. Today I came into the shack to find no audio > coming out of the K2 and when I tried to change the AFIL settings it > said 'not installed'. I cannot change the RTC menu settings either. > > I have moved S1 on the KAF2 to bypass it and all is working fine so it > seems there is a fault on the KAF2. The manual suggests this is a fault > with the microcontroller, which of course it may well be, but are there > any other known causes? I did think of the backup battery but not sure > if this would cause issues outside the RTC, it measures just over 3V so > a bit down. > http://davesergeant.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KAF2 faulty
And to confirm that replacing U4 78L06 got the KAF2 working again. A mystery why it failed though... 73 Dave G3YMC On 8 Dec 2014 at 10:56, Dave Sergeant wrote: > Further investigation shows the output of U4 78L06 regulator to be down > to 1V. So it appears the 78L06 has failed and once I have found one I > will change it. > > Thanks for the help. > > 73 Dave G3YMC > > On 6 Dec 2014 at 15:57, Dave Sergeant wrote: > > > My KAF2 has been working fine in my K2 for some years, not that I > > actually use it that much. Today I came into the shack to find no > > audio coming out of the K2 and when I tried to change the AFIL > > settings it said 'not installed'. I cannot change the RTC menu > > settings either. > > > > I have moved S1 on the KAF2 to bypass it and all is working fine so it > > seems there is a fault on the KAF2. The manual suggests this is a > > fault with the microcontroller, which of course it may well be, but > > are there any other known causes? I did think of the backup battery > > but not sure if this would cause issues outside the RTC, it measures > > just over 3V so a bit down. > > > http://davesergeant.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KAF2 vs DSP
I only have the KAF 2 filter, and have never heard the DSP, but I am very happy with the KAF 2. If anything, position 2 boosts the cw signal, and I don't find any ringing on the cw note. I never use the KAF2 on SSB . I consider the KAF well worth the money, especially since I got it used at a good price. George, N4ym ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] WTB: ELECRAFT KAF2
Does anyone have a KAF2 they're not using? Please contact me off-list if you do. Tnx es 73, ed - k9ew ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 or KDSP2
Hi All, The build of 5226 continues and I have a question best answered by the serious cw dxers in the group. Which is the better audio filter for cw? AF dsp on ssb has left me at best luke warm. And I don't do that much ssb dxing if I can help it. So don't consider ssb in the answer. Just CW. As serious CW ops, which works better the KDSP2 or the KAF2? Both for the quick contact and for sustained listening. Thanks in advance, Joe N9JR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 v. KDSP2
I am planning on purchasing a K2 for general use (SSB and CW) with a current preference for CW. (I enjoy working on CW although I'm not very good.) My preferences may change as my experience grows, so flexibility is important. The question is, why would you want to have the KAF2 instead of the KDSP2? From querying the archives, it seems that the KAF2 is primarily used for CW and is effective for that use. Is the KDSP2 less effective for reducing unwanted noise on CW, or is it equally effective but more costly. I assume that Elecraft continues to sell the KAF2 because it either has a performance advantage in some niche or is less costly and works for certain uses (such as CW). Thanks for the advice, Howard Ashcraft W1WF ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 v. KDSP2
W1WF wrote: >The question is, why would you want to have the KAF2 instead of the KDSP2? Cost, and for some issues the KAF2 will work as well as its more expensive brother. Many guys have KAF2's sitting in their desks that have been replaced by KDSP2's, and these are typically available for $50 or less (some even give them away). This is versus $219 for the KDSP2, which is a fair increment to the K2's base price. I first built and used my K2 without any audio filter, because my experience has been that they did not do much for me (and I've tried almost every audio filter there is including DSP, SCAF and the Hildreth filter described by W6NRW in a January 1980 Ham Radio article). Part of this has to do with how you like to listen for weak signals. I've found I hear weak signals better with a wider bandwidth than most DSP's and use the DSP between-my-ears. The human ear/brain has been proven to have an effective bandwidth of about 40-50 Hz but it needs a wider BW input (typically >300 Hz) to process noise floor signals effectively. Back to my K2, one night while listening for YA8G (at my noise floor) on 1814.0, I was quite surprised to hear a signal from W1AW's S9+30 signal sending code practice on 1817.5. Apparently this was caused by filter blow-by in the K2's crystal filter. Eric or Wayne (I forget which) recommended that either the KAF2 or KDSP2 would clear up the problem. A local offered to let me have his KAF2 and indeed it solved the problem or at least masked it so I no longer hear unwanted QRM from close strong signals. I would first build your K2 without any audio filter and see how you like it. You can always add either audio filter later if you decide you really need one. If the KAF2 will solve your problem, it much more cost-effective than the KDSP2. I seldom use my KAF2 in normal operation unless I experience blow-by QRM from nearby strong signals when trying to copy extremely weak signals. In defense of the K2, this is a corner case problem that I very rarely notice in normal operations. 73, Bill W4ZV ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 filter for sale
I have like new KAF2 audio filter for sale. $55 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2-Assembly questions
At 05:30 PM 3/15/2008, Fred Jensen wrote... >I'm building the KAF2 Audio Filter. Two questions for whoever knows: There's a good picture on the Elecraft site which should answer your concerns: http://www.elecraft.com/kaf2/kaf2_top.jpg ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2-Assembly questions
Andrew Moore wrote: Reference: http://www.elecraft.com/kaf2/kaf2_side.jpg Thanks Andrew. As has happened with every kit I've built, I got the sides of the board mixed up, the picture made that clear. It seems that after I get components on each side and they look sort of similarly populated, and have been building for a couple of hours, this happens. I was able to get the two trimpots out and installed on the proper side. I am now going to take a break until tomorrow evening :-) Fortunately, this isn't likely to be a problem when my K3 gets here although some other technical difficulty in my mind will probably arise. 73, Fred K6DGW - Northern California Contest Club - CU in the 2008 Cal QSO Party 4-5 Oct 08 - www.cqp.org ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2-Assembly questions
Be sure you put the boards in the K3 sunny side up, Fred :-) 73, Bob N6WG - Original Message - From: "Fred Jensen" <[EMAIL PROTECTED]> To: "Elecraft Reflector" Sent: Saturday, March 15, 2008 2:52 PM Subject: Re: [Elecraft] KAF2-Assembly questions > Andrew Moore wrote: > > Reference: > > > > http://www.elecraft.com/kaf2/kaf2_side.jpg > > > > Thanks Andrew. As has happened with every kit I've built, I got the > sides of the board mixed up, the picture made that clear. It seems that > after I get components on each side and they look sort of similarly > populated, and have been building for a couple of hours, this happens. > I was able to get the two trimpots out and installed on the proper side. > I am now going to take a break until tomorrow evening :-) > Fortunately, this isn't likely to be a problem when my K3 gets here > although some other technical difficulty in my mind will probably arise. > > 73, > > Fred K6DGW > - Northern California Contest Club > - CU in the 2008 Cal QSO Party 4-5 Oct 08 > - www.cqp.org > ___ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2/KDSP2 impressions
N5BCN> If you get a chance, do you mind emailing me your impressions of the KAF2 vs the KDSP2? I'm interested in buying one or the other, and hoped to get the opinion of someone who has listened to both. I've been going though this very exercise over the last several months, including about an hour or more spent evaluating a K2-KAF2 side-by-side with a K2-KDSP2 at a local ham's QTH. Our K2s were otherwise configured almost identical. To make a long story short we concluded that neither filter is a clear winner over the other. It's more a matter of tradeoffs. Here are my general impressions: - in some cases the KAF2 produced a more intelligible signal - in some cases the KDSP2 produced a more intelligible signal - KAF2 has a slightly softer, more analog sound. This is not to say the KDSP2 always has a harsher sound in all cases. - KDSP2 was able to pull a weak signal out better, but at the cost of some distortion - The KDSP2 has a noise reduction feature to attenuate background hiss - great for reducing fatigue when listening to RX for a long time while doing other things around the shack, etc. - KAF2 consumes less power - KAF2 has a much simpler user interface: either a simple toggle (AF2 -> Off) or 3-way (AF1 -> AF2 -> Off) depending on how you have it jumpered - KDSP2 allows you to write custom filters (requires additional development tools) In my experience (and opinion) the KAF2's strengths are simplicity and purity, while the KDSP2's are noise reduction and weak signal work. I'll have more to say about it after today or tomorrow, when my KDSP2 will come in and I'll start spending some time evaluating it in depth (been using the KAF2 for about 6 years now). --Andrew, NV1B .. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Kaf2 anti ringing mod
I have seen mention of an anti ringing modification for the kaf2 that was published several years ago by ki6wx. Has anyone done this mod or know where I can find the details? The link often mentioned no longer works. Thanks, Bill WV1N __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KAF2 found - thanks Bill
__ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KAF2 filter mod experience ?
I just received a KAF2 audio filter kit for my K2 and I am considering a few mods when I build it, to increase the bandwidth somewhat, and to increase the gain. My use of the K2 is mostly for VHF weak signal work with transverters, often outdoors with lots of background noise (surf, crickets !) so more overall gain would be useful on weak signals, and in HF CW contests where I'd like to get more rejection of signals far off frequency more than I need really narrow bandwidth. I am familiar with the notes from KI6WX on bandwidth and from Elecraft on increasing gain (both referenced in LA3ZA's mods list) and I have the capability to model the circuit and predict frequency response. Has anyone else tried different variations on the filter bandwidths and if so what are your impressions of the results, and are there any hidden traps in making changes ? 73, Steve VE3SMA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KAF2, KDSP2 or BMF2
I've been following the neat discussion on filtering with the K2 and find it quite interesting. I have obtain a new type of filter that did not cost me anything. Now the KAF2 worked well for me, but I felt the BMF2 worked better. I have not tried toeh KDSP2 yet (it is rather pricey) so I have stuck with the BMF2 filter along with the K2's crystal filters. The BMF2 works well, travels very well, and can be put in or out of the circuit without too much trouble. BMF2 has a very low power consumption and doesn't not take any power from the K2. Perfect for portable operation too, although I use mine in the shack all the time. It is low cost. the BMF2 is Bio-Mass Filter for the K2. You can have BMF1 for the K1. It is called your brain. Best filter in the world. Fastest and most complex computer yet devised. Grin Lee - K0WA In our day and age it seems that Common Sense is in short supply. If you don't have any Common Sense - get some and use it. If you can't find any common sense, ask for help from somebody who has some common sense. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 clock cell life
I forget when I got my KAF2, but it was pretty much right when they came out. My clock seesm to lose its marbles a lot these days. I figure it might be the lithium cell. Wonder how long they are supposed to last for in this application? I have a picoammeter here at work. Maybe I could hook it up and find out what the thing really draws when "off." Until I get a chance to do that (ha! next year, maybe) maybe some other long-time K2/KAF2 owner has experienced the clock issue. Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2, 30M both FB!
I just installed my KAF2 and recalibrated my K2, then took it for a little spin - and worked Brad, FO/N6JA in Tahiti, on 10104, at 0418Z. LL 72 es oo, Lloyd, K3ESE - Reisterstown, Maryland FM19pl K2#4442 - ATS-3 - KX1#11 - multiPIG+#14 - K1#379 Loop - EDZ - LW - Begali Signature Edition #75 ARRL - ARS - QRParci - QCWA - FISTS #8774 FPQRP #-476 - QRP-L - BORG #2 NAQCC #236 - CQC #770 Fun = Skill / Power ! 8^ D Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KAF2 or KDSP2
Joe I have both the KAF2 and KDSP2. I prefer the DSP because the filter skirts are steeper, and I can get some Noise Reduction with it. Not available with the analog KAF2. Good luck and 73 Bob N6WG The Little Station with Attitude -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Joseph Reed Sent: Thursday, February 02, 2006 6:53 PM To: elecraft@mailman.qth.net Subject: [Elecraft] KAF2 or KDSP2 Hi All, The build of 5226 continues and I have a question best answered by the serious cw dxers in the group. Which is the better audio filter for cw? AF dsp on ssb has left me at best luke warm. And I don't do that much ssb dxing if I can help it. So don't consider ssb in the answer. Just CW. As serious CW ops, which works better the KDSP2 or the KAF2? Both for the quick contact and for sustained listening. Thanks in advance, Joe N9JR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KAF2 v. KDSP2
I primarily use my K2 for CW and I sold my KAF2 about 3 months after I got the KDSP2I love it...I'll put this rig up against anything else...when using the Crystal filters and KDSP2 all I hear is the CW station...I have no noise or ringing or anything...I'd shoot for the KDSP2 if I were you. Gregg R. Lengling, W9DHI, Retired Administrator http://www.milwaukeehdtv.org K2/100 S#3075 KX1 S# 57 Member: ARRL, RSGB, RCA, WERA and ORC -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Howard W. Ashcraft Sent: Thursday, July 22, 2004 3:19 PM To: elecraft@mailman.qth.net Subject: [Elecraft] KAF2 v. KDSP2 I am planning on purchasing a K2 for general use (SSB and CW) with a current preference for CW. (I enjoy working on CW although I'm not very good.) My preferences may change as my experience grows, so flexibility is important. The question is, why would you want to have the KAF2 instead of the KDSP2? >From querying the archives, it seems that the KAF2 is primarily used for CW and is effective for that use. Is the KDSP2 less effective for reducing unwanted noise on CW, or is it equally effective but more costly. I assume that Elecraft continues to sell the KAF2 because it either has a performance advantage in some niche or is less costly and works for certain uses (such as CW). Thanks for the advice, Howard Ashcraft W1WF ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 v. KDSP2
Howard W. Ashcraft wrote: Is the KDSP2 less effective for reducing unwanted noise on CW, or is it equally effective but more costly. I assume that Elecraft continues to sell the KAF2 because it either has a performance advantage in some niche or is less costly and works for certain uses (such as CW). I have had both, and I'm primarily a CW operator. I live in a relatively noisy environment. My experience has been that the KDSP2 is much more helpful, because it provides noise reduction in addition to a narrow filter. It is also much more flexible, providing many more bandwidth options. Although I haven't tried it, I understand that the automatic notch filter works well on SSB. I think the reason they still sell it is that it is much less costly than the DSP. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 v. KDSP2
Howard, I can't speak for anyone else, but I just don't like the sound of any audio DSP processor, particularly for CW use. They are good for digging signals out very close to the noise level, but my ears find the KAF2 far less irritating for extended operating periods. It is more a matter of personal preference - the KDSP2 users seem to be quite happy with it, and I have built several for other hams, so I have had opportunity to listen to both on a bit more than a casual basis. For mostly SSB operation I can recommend the KDSP2 for no other reason than the noise reduction, but I personally find I can do without it. Each to his own - if you could listen to both before making up your mind you can make a better decision. With the KDSP2 you can adjust the parameters to alter the sound, but chosing the 'correct' ones for your ears may take a while and a lot of trial and error. 73, Don W3FPR - Original Message - I am planning on purchasing a K2 for general use (SSB and CW) with a current preference for CW. (I enjoy working on CW although I'm not very good.) My preferences may change as my experience grows, so flexibility is important. The question is, why would you want to have the KAF2 instead of the KDSP2? >From querying the archives, it seems that the KAF2 is primarily used for CW and is effective for that use. Is the KDSP2 less effective for reducing unwanted noise on CW, or is it equally effective but more costly. I assume that Elecraft continues to sell the KAF2 because it either has a performance advantage in some niche or is less costly and works for certain uses (such as CW). ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 v. KDSP2
I bought my KAF2 before the KDSP2 was available. I have not upgraded to the KDSP2 for the following reasons: - it costs more - it uses more current - the KAF2 does a great job on CW If you are a SSB op, and are going with a KPA100... then it would be a natural progression to have a KDSP2 so that the radio is on par with other radios that have IF notch filtering and IF passband shift capabilities (although the KDSP is not IF... it is AF in design). - Daniel / AA0NI K2 #3421 --- "Howard W. Ashcraft" <[EMAIL PROTECTED]> wrote: > I am planning on purchasing a K2 for general use (SSB and CW) with a current > preference for CW. (I enjoy working on CW although I'm not very good.) My > preferences may change as my experience grows, so flexibility is important. > The question is, why would you want to have the KAF2 instead of the KDSP2? > From querying the archives, it seems that the KAF2 is primarily used for CW > and is effective for that use. Is the KDSP2 less effective for reducing > unwanted noise on CW, or is it equally effective but more costly. I assume > that Elecraft continues to sell the KAF2 because it either has a performance > advantage in some niche or is less costly and works for certain uses (such as > CW). > > Thanks for the advice, > > Howard Ashcraft > W1WF > > ___ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KAF2 v. KDSP2
I operate 99.99% CW (Haven't even fired up PSK in a year and it's been longer than that since I plugged in the mic) and, not saying anything negative about either the DSP or the audio filter, I don't have either and don't feel motivated to add either to my K2/100. I really like the "sound" of the K2 I.F. filters. Their fairly soft sides avoid lots of artifacts that add harshness to the sound of the bands. Yet they have all the selectivity that I need with their excellent stop band characteristics. Ron AC7AC -Original Message- Howard, I can't speak for anyone else, but I just don't like the sound of any audio DSP processor, particularly for CW use. They are good for digging signals out very close to the noise level, but my ears find the KAF2 far less irritating for extended operating periods 73, Don W3FPR - Original Message - I am planning on purchasing a K2 for general use (SSB and CW) with a current preference for CW. (I enjoy working on CW although I'm not very good.) My preferences may change as my experience grows, so flexibility is important. The question is, why would you want to have the KAF2 instead of the KDSP2? >From querying the archives, it seems that the KAF2 is primarily used >for CW and is effective for that use. Is the KDSP2 less effective for reducing unwanted noise on CW, or is it equally effective but more costly. I assume that Elecraft continues to sell the KAF2 because it either has a performance advantage in some niche or is less costly and works for certain uses (such as CW). ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 v. KDSP2
Hi Howard, I built both KAF2 and KDSP2 for a number of hams. Having the chances of comparing both of them, my views are as follows: 1. There is a substantial price difference between KAF2 and KDSP2. 2. For CW reception, KAF2 performs not much worse than KDSP2 BUT the noise reduction in KDSP2 will lessen the listening fatigue. Of course, there are always individuals who do not like the digital sound. However, I find the noise reduction of KDSP2 is in line with my IC756pro2. 3. For SSB reception, KDSP2 is well more useful than KAF2. I understand you may not be interested in SSB BUT the inclusion of SSB in K2 makes the rig complete. For example, when you drive a Mercedes, you may wish to have alloy wheels or even AMG accessories as a completion. In this respect, KDSP2 is a good choice. Therefore, you choices may depend on: 1. cost concern; 2. the chance of using SSB in your operation 73 Johnny Siu VR2XMC - Original Message - From: "Howard W. Ashcraft" <[EMAIL PROTECTED]> To: Sent: Friday, July 23, 2004 4:18 AM Subject: [Elecraft] KAF2 v. KDSP2 I am planning on purchasing a K2 for general use (SSB and CW) with a current preference for CW. (I enjoy working on CW although I'm not very good.) My preferences may change as my experience grows, so flexibility is important. The question is, why would you want to have the KAF2 instead of the KDSP2? >From querying the archives, it seems that the KAF2 is primarily used for CW and is effective for that use. Is the KDSP2 less effective for reducing unwanted noise on CW, or is it equally effective but more costly. I assume that Elecraft continues to sell the KAF2 because it either has a performance advantage in some niche or is less costly and works for certain uses (such as CW). Thanks for the advice, Howard Ashcraft W1WF ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 v. KDSP2
In the CQ 160 CW contest this past winter we used my K2/100 (SN 850 A)with the KDSP2. No receive antenna (that's a whole story by itself!) and an Inverted-L with a flock of radials. Probably 80% of the time we ran with out any NR or DSP filters. If you could put a dollar amount on multipliers, the KDSP2 got us about 4 non-North American mults that we most likely would not have been 99.9% sure that he was coming back to us without it. In the month or two after the contest the thing got me another 5 countries that I probably would not have heard well enough to work. Would a KAF2 done that? Don't know - the other K2/100 (SN 3519 B) has a KAF2 but no 160M board in it yet, but I don't think so. That said, I don't like the KDSP2 at all for normal QSO's or HF contesting (160 is MF), but it's like that hammer drill I talked the wife into letting me get -- when you need it to do the job, you're glad you have it. And the clock is cute! 73HankK8DD ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 v. KDSP2
I've used both the KAF2 and KDSP2 with my K2 and can offer these comments: For the noise reduction feature of DSP to work well requires a wide bandwidth. That is why any DSP unit is less effective in the NR department on CW than it is on SSB. Personally, I like very narrow BWs when working CW because it enables me to hear the weak signals better. The KDSP2 does a very good job in giving me a very narrow BW with reasonably steep skirts, however that narrow BW makes its NR feature totally ineffective. In contrast, when using the wide BWs necessary for SSB work, the KDSP2's NR feature works incredibly well. Comparing the KDSP2 with the KAF2 on CW, I prefer the KDSP2 because I can set its BW very narrow and therefore dig the weak ones out of the mud better than I can with the KAF2. Now, if only my K2/100 had a mu-metal shield around it so that I could use it with my linear amplifier without degrading its transmit signal (the hypersil HV xfmr in the amp puts out a BIG electromagnetic field at 60 Hz which puts hum into the PLL oscillator circuit in the K2 unless they are separated by an unreasonably large distance). 73, de Earl, K6SE K2 #2622 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 v. KDSP2
On Thu, 22 Jul 2004 13:18:37 -0700, Howard W. Ashcraft wrote: >Is the KDSP2 less effective for reducing unwanted noise on CW No, the KDSP2 provides both a very effective variable bandwidth audio filter (wonderful for both CW and SSB), and a very effective dynamic noise reducer (also very effective on both CW and SSB). If you are starting from scratch, you definitely want the KDSP2. I'm mainly a CW guy, but occasionally work SSB contests. I find the KDSP2 to be a real asset for both modes. Jim K9YC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 Built and tested FS
I have a built and tested KAf2 that was removed for the DSP filter. Will sell with included shipping for 65$. 73, Bill K9YEQ K2 #35; KX1 #35; K3 #1744; mini mods ATS-3B __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] FS: Elecraft KAF2 and KXPD1
Both assembled and working fine, surplus to my needs here, have dupes of both. KAF2 = $65 shipped KXPD1 = $55 shipped Christmas Clearance = $110 for both ! PayPal, MO, check OK. Alan, N3BJ -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.409 / Virus Database: 268.15.22/590 - Release Date: 12/16/2006 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2/DSP swap in UK
Anyone in the UK fancy swapping your KAF2 for my DSP board? I am focussing my K2 on CW and the KAF2 would be better for me. The board is fully built and functioning. 73 Ian __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KAF2 or KDSP2 for K2?
Well going from a rather ancient Ten Tec to a K2 has been a real treat for sure, and as most of us can't seem to be able to leave anything well enough alone, I was thinking about possible options I can add without breaking the bank. Can any of you folks tell me the real life difference between these two options and whether or not either one of them is worth the expense? I do almost no voice...all cw. Thanks! Steve W1SFR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KAF2 or KDSP2 for K2?
I operate mostly CW using a K2/10 with neither option, can't imagine that these would provide improved capability worth the added cost/complexity. Had considered the KAF2 before constructing the K2 but after completion and operation with the basic rig, decided to install a KSB2 instead. Haven't regreted the decision. Curt, KB5JO __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KAF2 or KDSP2 for K2?
Hello John, From time to time, there are used KAF2 available for sale in this reflector at a much lower price. I got mine at US$49. I don't like the KDSP2. The artifact of the sound is just annoying to me. This topic was well discussed in the past and you can find it from the archive. TNX & 73, Johnny VR2XMC 寄件人︰ John 收件人︰ elecraft@mailman.qth.net 傳送日期︰ 2012年05月3日 (週四) 8:24 AM 主題︰ Re: [Elecraft] KAF2 or KDSP2 for K2? Thanks to everyone for the comments and thoughts. I'll start with the bare K2 (I really don't have a choice at the moment) and see how it goes. Later I will refer to your comments again in the archives for the next step. 73 John, kx4o On 5/2/12 8:45 AM, Mike Harris wrote: > In my opinion the KAF2 is essential. The always in-line low pass filter > significantly reduces the high frequency audio hiss and makes SSB in > particular much nicer to listen to. Assuming that your hearing extends > above 3kHz. > > Note that there is a daughter board add on for earlier versions of the > K3 which does the same thing. This filter was incorporated into the DSP > board in a later revision. See the Elecraft web site for info. > > Regards, > > Mike VP8NO > > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KAF2 / KDSP2 (was : K2 noise)
Hello Bill, To my knowledge, K2 can either use KAF2 or KDSP2 but not both at a time. Did you do any modification to K2 so that both units can be used at the same time? 73 Johnny Siu 寄件人﹕ Bill Johnson 收件人﹕ gille...@verizon.net; vr2...@yahoo.com.hk 副本(CC) elecraft@mailman.qth.net 傳送日期﹕ 2010/2/4 (四) 12:26:06 PM 主題： RE: [Elecraft] Re： K2 noise I have both. Each has different results. The DSP unit has many settings and it takes a bit of time to set your personal setttings. I use both, sometimes together or one or the other. The best thing about the DSP is you have an infinite amount of settings. This, of course, can be undaunting without alot of patience. Bill K9YEQ KX1, K2, K3, THP HL2.5Kfx > From: gille...@verizon.net > Date: Wed, 3 Feb 2010 18:22:18 -0500 > To: vr2...@yahoo.com.hk > CC: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Re： K2 noise > > Thank you all for your candid response. I think I am going to forget > about it. > Best regards > Dick > On Feb 3, 2010, at 5:57 PM, Johnny Siu wrote: > > > Hi Mike, > > > > I agree with you. I sold my KDSP2 in return for a KAF2. The DSP > > functions in KDSP2 are just primitive when compared with modern DSP > > rigs (e.g. K3). > > > > I got my KAF2 in the second hand market at a much lower price. Of > > course, KAF2 is even more primitive but it is real cheap. You just > > pay the price for an internal clock but with additional filter > > function. > > > > I played around the KDSP2 with different settings (including the > > default one) but the results were nothing encouraging. Yes, it did > > function as it was advertised but the artifact was annoying. I am > > now happy with my KAF2 (just a fraction of the price of KDSP2 in > > the second hand market). > > > > 73 > > > > Johnny Siu VR2XMC protection. Sign up now. Yahoo!香港提供網上安全攻略，教你如何防範黑客! 請前往 http://hk.promo.yahoo.com/security/ 了解更多! __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KAF2 versus AF1 versus APF
I really miss the K3's APF in my K2. I previously tried a KAF2 but found it to be of marginal help. Has anyone found the AF1 to be as useful as APF? Does anyone have an AF1 they no longer need? I'd love to find someone close to Charlotte NC that might have one I could try before buying. 73, Bill W4ZV -- View this message in context: http://elecraft.365791.n2.nabble.com/KAF2-versus-AF1-versus-APF-tp7580191.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] ***Wanted*** Elecraft KAF2 Audio Filter
Hi Guys, Looking for a Completely assembled and operational Elecraft KAF2 Audio Filter for my Elecraft k2 Price shipped ***PayPal*** Trade??? I have a Icom FL 53a 250hz cw filter that I can trade. Tnx es 73 de ve3vtg __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KAF2, KDSP2 or BMF2
On 4/6/06, Lee Buller <[EMAIL PROTECTED]> wrote: > low cost. the BMF2 is Bio-Mass Filter for the K2. You can have BMF1 for the > K1. > It is called your brain. Best filter in the world. Fastest and most complex > computer > yet devised. I agree with your statements, the brain is an incredible device, and amazing flexible in adapting to various situations. I am still left wondering though about the "ringing" in my ears after listening in on older hams operate a station during Field Day. Several hams I know have complained of hearing lost and only one can pin it on his day job in a machine shop, rather than too much time listening to a loud radio to attempt to understand a signal underneath the QRN and QRM. Perhaps a not so obvious feature, if it is true, is through the use of either KAF2 or KDSP2 hams listen at a "safer" volume with less risk of further hearing lost, by helping our brain by filtering out at least some of the noise before the brain tries to decode the signal, allowing comfortable listening at a lower volume because your brain is not "working" as hard to separate out the signal from as much noise. I don't know, I am just wondering if anyone agrees or disagrees with that aspect of using additional "hearing aids". ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2, KDSP2 or BMF2
Michael, A lot of us "older hams" developed the habit of wearing our "cans" (as the headphones were known) a bit in front of our ears when working CW. I still do it. It protects my ears from sudden loud sounds. It also cuts down on the ringing in my ears. There is almost nothing as hard on hearing as pumping loud sounds directly down the ear canal. A lot of young folk will discover this the hard way when their hearing starts to disappear one of these days. 72, Jim W4BQP since '53 K2 #2268 michael taylor wrote: I am still left wondering though about the "ringing" in my ears after listening in on older hams operate a station during Field Day. Several hams I know have complained of hearing lost and only one can pin it on his day job in a machine shop, rather than too much time listening to a loud radio to attempt to understand a signal underneath the QRN and QRM. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KAF2, KDSP2 or BMF2
Look at these commercial operators at work for examples of what Jim is talking about: http://www.radiomarine.org/historic-5.html Ron AC7AC -Original Message- Michael, A lot of us "older hams" developed the habit of wearing our "cans" (as the headphones were known) a bit in front of our ears when working CW. I still do it. It protects my ears from sudden loud sounds. It also cuts down on the ringing in my ears. There is almost nothing as hard on hearing as pumping loud sounds directly down the ear canal. A lot of young folk will discover this the hard way when their hearing starts to disappear one of these days. 72, Jim W4BQP since '53 K2 #2268 michael taylor wrote: > >I am still left wondering though about the "ringing" in my ears after >listening in on older hams operate a station during Field Day. Several >hams I know have complained of hearing lost and only one can pin it on >his day job in a machine shop, rather than too much time listening to a >loud radio to attempt to understand a signal underneath the QRN and >QRM. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2, KDSP2 or BMF2
Glad you posted this, it's a FB handy household hint to save hearing! 73 de Alex NS6Y On Apr 6, 2006, at 11:01 PM, Ron D'Eau Claire wrote: Look at these commercial operators at work for examples of what Jim is talking about: http://www.radiomarine.org/historic-5.html Ron AC7AC -Original Message- Michael, A lot of us "older hams" developed the habit of wearing our "cans" (as the headphones were known) a bit in front of our ears when working CW. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2, KDSP2 or BMF2
michael taylor <[EMAIL PROTECTED]> wrote: Perhaps a not so obvious feature, if it is true, is through the use of either KAF2 or KDSP2 hams listen at a "safer" volume with less risk of further hearing lost, by helping our brain by filtering out at least some of the noise before the brain tries to decode the signal, allowing comfortable listening at a lower volume because your brain is not "working" as hard to separate out the signal from as much noise. I don't know, I am just wondering if anyone agrees or disagrees with that aspect of using additional "hearing aids". Wearing the "cans" in front of one's ears as noted by Jim W4BQP has saved my ears during almost 60 years of operating. As for audio filtering etc, in another receiver I use a form of "stereo" audio circuitry, with low pass filters in each channel to reduce noise, plus some other trickery. The result is akin to being at a party with conversations being held in various parts of the room, some from the left others from the right, some from the front and others from behind. This really helps the brain to search out and lock onto a particular person's chatter (the desired signal). Unfortunately I have had better results using two product detectors rather than one with audio phasing, to produce the two audio inputs, so such a system could be difficult to add to the K2. But there is always the K3! 73, Geoff GM4ESD ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 - good filter for CW!!!
Hi! Last evening I finished KAF2 audio-filter for my K2. For adjusting CW filter BFO, and for looking maximum peak with KAF2 I'm used spectrogamm on my PC and XG1 test oscillator. With spectrogramm it's very easy! Now the weak signals on 160 and 80m-band I'm copy very strong with KAF2! It working exellence! 72!73! Alexander Ponomarenko de UR5LAM K2 #5287 __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 - good filter for CW!!!
UR5LAM wrote: >Last evening I finished KAF2 audio-filter for my K2. For adjusting CW filter BFO, and for looking maximum peak with KAF2 I'm used spectrogamm on my PC and XG1 test oscillator. With spectrogramm it's very easy! Now the weak signals on 160 and 80m-band I'm copy very strong with KAF2! Priwet Alexander! Would you mind sharing with us what filter parameters worked best for you? 73, Bill W4ZV P.S. KI6WX has some KAF2 measurements here: http://home.pacbell.net/johngreb/kaf2_filter_modifications.pdf ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 For Sale on eBay
Hi All, I have a KAF2 for sale on eBay. Visit: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5722470361 to bid on it. The auction ends on October 1st. I just bought a KDSP2 so I dont nee the KAF2 any more. 73, Bill... AIØC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAF2 cylindrical crystal I got two.
I am confused on the X1 Crystal, cylindrical 32.768 crystal. I have two. One is labeled S573 and the other is labeled S793. I don't think there are supposed to be two and I am not familiar with these. I gues the 793 is closest to the 32.768 but some advice would be nice or am I overlooking something? Ivin __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
Just my opinion having used both, Steve, but if you are primarily a CW operator I think you would be better off with the KAF2. 73 DE David G4DMP In a recent message, Stephen Roberts writes >Well going from a rather ancient Ten Tec to a K2 has been a real treat >for sure, and as most of us can't seem to be able to leave anything >well enough alone, I was thinking about possible options I can add >without breaking the bank. Can any of you folks tell me the real life >difference between these two options and whether or not either one of >them is worth the expense? I do almost no voice...all cw. -- + - - - - - - - - - - - - - - - - + | David M Pratt, Kippax, Leeds. | | Website: http://www.g4dmp.co.uk | + - - - - - - - - - - - - - - - - + __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
Steve - situation here was much the same - went from older Ten-Tec to a K2, do CW only, and wrestled with the KAF2 / KDSP2 choice, spent lots of time with KAF2 and some time evaluating KDSP2, even in side by side tests (two rigs). I have some details of the experience which I think are only in email and never made it to the list, so I'll dig those up for you. One is no dramatically better overall than the other; the choice is more about the application. In the end I decided that for the CW op, the KAF2 wins, but for an all-mode op (or SSB/data mode op), it's the KDSP2, which provides some flexibility that the KAF2 doesn't have. I found the KDSP2 to be a little *too* configurable/fiddly, but keep in mind that's because as a CW op I didn't have a need for that much control over sideband cutoffs, bandwidths for data modes, etc... The KAF2 is dead simple in operation and is very effective. I'll dig up my notes and send them your way (or to the list). --Andrew, NV1B .. On Tue, May 1, 2012 at 12:26 PM, Stephen Roberts wrote: > Well going from a rather ancient Ten Tec to a K2 has been a real treat for > sure, and as most of us can't seem to be able to leave anything well enough > alone, I was thinking about possible options I can add without breaking the > bank. Can any of you folks tell me the real life difference between these > two options and whether or not either one of them is worth the expense? I > do almost no voice...all cw. > > Thanks! > > Steve > W1SFR > > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
For serious contest use of the K2 on 160, I found that the extra skirt depth afforded by the DSP was extremely useful when running as opposed to search and pounce. On the other hand the easy rolloff of audio off the center frequency was useful. Like some others what I really wanted was BOTH. 73, Guy. On Tue, May 1, 2012 at 12:50 PM, David Pratt wrote: > Just my opinion having used both, Steve, but if you are primarily a CW > operator I think you would be better off with the KAF2. > > 73 DE David G4DMP > > In a recent message, Stephen Roberts writes > >Well going from a rather ancient Ten Tec to a K2 has been a real treat > >for sure, and as most of us can't seem to be able to leave anything > >well enough alone, I was thinking about possible options I can add > >without breaking the bank. Can any of you folks tell me the real life > >difference between these two options and whether or not either one of > >them is worth the expense? I do almost no voice...all cw. > -- > + - - - - - - - - - - - - - - - - + > | David M Pratt, Kippax, Leeds. | > | Website: http://www.g4dmp.co.uk | > + - - - - - - - - - - - - - - - - + > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
My K2 had the DSP. I programmed the DSP in a way that it tracked the IF filter settings. I had that both in CW (4 settings) and SSB. This way the DSP worked great as a combo with the IF filtering. More or less as in the K3. The DSP auto notch worked reasonable well. Never got the NR configured in a way that it could increase my copy so never used that. Good luck. 73 Arie PA3A __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
And I too have found many applications/times that would be nice to have both.In fact, I have an outboard unit that I am going to make work so I can have two in one... well.. sorta. that takes care of the digi/analog.. now how to do the analog/digi? --... ..--- Dale - WC7S in Wy __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
One question I have about the choice between the KAF2 and KDSP2 is what about having neither. How would one describe the receiver/filter capabilities of the bare K2? Thanks. John, kx4o On 5/1/12 1:29 PM, Guy Olinger K2AV wrote: > For serious contest use of the K2 on 160, I found that the extra skirt > depth afforded by the DSP was extremely useful when running as opposed to > search and pounce. On the other hand the easy rolloff of audio off the > center frequency was useful. Like some others what I really wanted was > BOTH. > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
Bluntly, as clever as the CW filter scheme was for both cost and effectiveness, the DSP for me really put the finishing touches on the performance. But that is a contesting analysis. No contesting, maybe I don't care. I have the four CW widths and I have the DSP filters set to exactly match the skirts. A bit of a pain getting that right, but when I'm out working on an antenna somewhere running battery, I don't have an issue that I wish I had my K3 out there for hearing. And when I've got something matched by the auto tuner, I know the network values being used to do it. 73, Guy. On Tue, May 1, 2012 at 7:46 PM, John wrote: > One question I have about the choice between the KAF2 and KDSP2 is what > about having neither. > > How would one describe the receiver/filter capabilities of the bare K2? > > Thanks. > > John, kx4o > > On 5/1/12 1:29 PM, Guy Olinger K2AV wrote: > > For serious contest use of the K2 on 160, I found that the extra skirt > > depth afforded by the DSP was extremely useful when running as opposed to > > search and pounce. On the other hand the easy rolloff of audio off the > > center frequency was useful. Like some others what I really wanted was > > BOTH. > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
John, The IF filter response of the K2 filter can be quite good by itself, but cascaded filters are better, particularly the DSP straight sided filter responses. To optimize the IF filters, I would encourage all to use Spectrogram (or something equal) and a wideand noise generator ( or atmospheric band noise on a dead band) to determine the actual width and positioning of each filter. See part 3 of the K2 Dial Calibration article on my website www;.w3fpr.com for more information. I would like to point out that most K2 filters are not set for optimum response - the settings in the manual will produce working filters, but certainly not optimum. I have described the process for achieving not only good dial calibration, but also good filter response in the K2 Dial Calibration article on my website www.w3fpr.com. 73, Don W3FPR On 5/1/2012 7:46 PM, John wrote: > One question I have about the choice between the KAF2 and KDSP2 is what > about having neither. > > How would one describe the receiver/filter capabilities of the bare K2? > > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
Have to vote for Don's article on his web page. Did it that way and got the splendid results right off, first time. Huge help. Many thanks, Don. Oh and probably that is why I saw such a difference adding the DSP. Got maximum results to start with. I wasn't comparing the K2 after DSP to the K2 before. I was evaluating the K2 in contest conditions and comparing results with other rigs. If one is going to do CW contesting then you do need the DSP and the good procedure for adjustment. 73, Guy. On Tue, May 1, 2012 at 9:46 PM, Don Wilhelm wrote: > John, > > The IF filter response of the K2 filter can be quite good by itself, but > cascaded filters are better, particularly the DSP straight sided filter > responses. To optimize the IF filters, I would encourage all to use > Spectrogram (or something equal) and a wideand noise generator ( or > atmospheric band noise on a dead band) to determine the actual width and > positioning of each filter. See part 3 of the K2 Dial Calibration > article on my website www;.w3fpr.com for more information. > > I would like to point out that most K2 filters are not set for optimum > response - the settings in the manual will produce working filters, but > certainly not optimum. I have described the process for achieving not > only good dial calibration, but also good filter response in the K2 Dial > Calibration article on my website www.w3fpr.com. > > 73, > Don W3FPR > > On 5/1/2012 7:46 PM, John wrote: > > One question I have about the choice between the KAF2 and KDSP2 is what > > about having neither. > > > > How would one describe the receiver/filter capabilities of the bare K2? > > > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
John Huggins, kx4o wrote > > One question I have about the choice between the KAF2 and KDSP2 is what > about having neither. > > How would one describe the receiver/filter capabilities of the bare K2? > John neither is a valid response for some situations...it all depends on your operating modes. I use my QRP K2 exclusively for field operating so take my comments with that in mind. I used the rig for several years with no filtering besides the XFIL (set for 1000/700/400/100 BWs). I then decided to add a KAF2 thinking it might add some capability, but in fact I seldom use it. I even modified the AF2 setting for low ringing per KI6WX's analysis (BTW the KI6WX link on LA3ZA's mod site no longer works). This past weekend in the QRPTTF event, conditions were such that nearly all QRP signals were at or below the very low noise floor. Very few signals would light ANY meter bars even with the preamp on. I found my best copy was using the 1000 Hz BW and no AF filtering. I tried both the KAF2's AF1 and AF2 settings several times but always returned it to off for best copy. For copying weak signals in white noise, I find my ears usually beat any DSP (e.g. K3) or analog filtering with the sole exception of the K3's APF, which can help in some situations. My ears need wide bandwidth to help discriminate weak signals from noise and the fact that APF allows this (a very sharp AF filter with gain superposed on a much wider IF bandwidth) makes it helpful in certain situations. Anyway, the K2 without additional AF filtering works well for me when copying weak signals if that's your primary operating mode. I did rediscover this weekend how much I hate (i.e. worse than dislike!) the very high distortion in the K2's sidetone which makes it difficult to match signals when zero-beating. TF3MA's mod for that is next on my K2 list: http://www.raunvis.hi.is/~matti/TF3MA/sidetone_tf3ma.html 73, Bill W4ZV -- View this message in context: http://elecraft.365791.n2.nabble.com/KAF2-or-KDSP2-for-K2-tp7517325p7519675.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
In my opinion the KAF2 is essential. The always in-line low pass filter significantly reduces the high frequency audio hiss and makes SSB in particular much nicer to listen to. Assuming that your hearing extends above 3kHz. Note that there is a daughter board add on for earlier versions of the K3 which does the same thing. This filter was incorporated into the DSP board in a later revision. See the Elecraft web site for info. Regards, Mike VP8NO On 01/05/2012 20:46, John wrote: > One question I have about the choice between the KAF2 and KDSP2 is what > about having neither. > > How would one describe the receiver/filter capabilities of the bare K2? > > Thanks. > > John, kx4o __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
For my operating style (DX-ing, contesting that serious contesters would consider "casual", mostly CW), the filtering capabilities of the basic K2 are way more than adequate. Using the N-GEN + Spectrogram procedure for filter setup works extremely well and I almost never found myself wishing for "more filtering" during recent ARRL CW DX and CQWW CW contests. The K2 is already so much quieter than its predecessor (a Kenwood TS850) that I don't really feel the need to add the noise quieting benefits of either the KDSP2 or KAF2. - Bruce - Bruce Rosen K1FFX K2/100 6982 -- View this message in context: http://elecraft.365791.n2.nabble.com/KAF2-or-KDSP2-for-K2-tp7517325p7520623.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
Thanks to everyone for the comments and thoughts. I'll start with the bare K2 (I really don't have a choice at the moment) and see how it goes. Later I will refer to your comments again in the archives for the next step. 73 John, kx4o On 5/2/12 8:45 AM, Mike Harris wrote: > In my opinion the KAF2 is essential. The always in-line low pass filter > significantly reduces the high frequency audio hiss and makes SSB in > particular much nicer to listen to. Assuming that your hearing extends > above 3kHz. > > Note that there is a daughter board add on for earlier versions of the > K3 which does the same thing. This filter was incorporated into the DSP > board in a later revision. See the Elecraft web site for info. > > Regards, > > Mike VP8NO > > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
For most CW work, the K2 is fine without either, in my experience. I got the KAF2 to give me an extra edge in tough conditions, QRP, etc. but most of the time I just use XFIL1-4. That's not to say the KAF2 isn't useful in some conditions; I still love having it. --Andrew, NV1B .. On Tue, May 1, 2012 at 7:46 PM, John wrote: > One question I have about the choice between the KAF2 and KDSP2 is what > about having neither. > > How would one describe the receiver/filter capabilities of the bare K2? > > Thanks. > > John, kx4o > > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2?
On 05/01/12 09:26, Stephen Roberts wrote: > Can any of you folks tell me the real life difference between these two options and whether or not either one of them is worth the expense? If you live in the city, I wonder if you might prefer either the KDSP2 or the KNB2 over the KAF2. I live on a busy intersection in a big city, so 've got pulse noise more often than not. The KNB2 takes it out pretty well. I think the KDSP2 will deal with pulse noise, also, but the KAF2 alone won't do any more than dull the high frequency component of pulse noise. Also (but this is probably just me), I find that the KAF2 blurs the edges of the dits and dahs, making signals harder to copy rather than easier. Regards, Wayne Conrad KF7QGA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 / KDSP2 (was : K2 noise)
Johnny, My apologies, I misread thinking it was a KNB2. I use that and the DSP unit together. I have a KAF2 which I am not using and find that the flexibility of the DSP unit is greater. For some reason I was more focused on noise. Bill K9YEQ KX1, K2, K3, THP HL2.5Kfx Date: Thu, 4 Feb 2010 13:50:04 +0800 From: vr2...@yahoo.com.hk Subject: [Elecraft] KAF2 / KDSP2 (was : K2 noise) To: k9...@live.com; gille...@verizon.net CC: elecraft@mailman.qth.net Hello Bill, To my knowledge, K2 can either use KAF2 or KDSP2 but not both at a time. Did you do any modification to K2 so that both units can be used at the same time? 73 Johnny Siu 寄件人﹕ Bill Johnson 收件人﹕ gille...@verizon.net; vr2...@yahoo.com.hk 副本(CC) elecraft@mailman.qth.net 傳送日期﹕ 2010/2/4 (四) 12:26:06 PM 主題： RE: [Elecraft] Re： K2 noise I have both. Each has different results. The DSP unit has many settings and it takes a bit of time to set your personal setttings. I use both, sometimes together or one or the other. The best thing about the DSP is you have an infinite amount of settings. This, of course, can be undaunting without alot of patience. Bill K9YEQ KX1, K2, K3, THP HL2.5Kfx > From: gille...@verizon.net > Date: Wed, 3 Feb 2010 18:22:18 -0500 > To: vr2...@yahoo.com.hk > CC: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Re： K2 noise > > Thank you all for your candid response. I think I am going to forget > about it. > Best regards > Dick > On Feb 3, 2010, at 5:57 PM, Johnny Siu wrote: > > > Hi Mike, > > > > I agree with you. I sold my KDSP2 in return for a KAF2. The DSP > > functions in KDSP2 are just primitive when compared with modern DSP > > rigs (e.g. K3). > > > > I got my KAF2 in the second hand market at a much lower price. Of > > course, KAF2 is even more primitive but it is real cheap. You just > > pay the price for an internal clock but with additional filter > > function. > > > > I played around the KDSP2 with different settings (including the > > default one) but the results were nothing encouraging. Yes, it did > > function as it was advertised but the artifact was annoying. I am > > now happy with my KAF2 (just a fraction of the price of KDSP2 in > > the second hand market). > > > > 73 > > > > Johnny Siu VR2XMC protection. Sign up now. Yahoo!香港提供網上安全攻略，教你如何防範黑客!了解更多 _ Hotmail: Trusted email with powerful SPAM protection. http://clk.atdmt.com/GBL/go/201469227/direct/01/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Kaf2 for the K2 for sale
Hello I was given both a KDSP2 and the KAF2 for my birthday by the xyl. Since I can't use both in my K2, I have deicided to sell the KAF2. It is still in the un-opened package, and will ship it for $65.00 to the USA only. If interested contact me at ( [EMAIL PROTECTED] ). Thanks Scott N5SM _ Make every IM count. Download Messenger and join the im Initiative now. Its free. http://im.live.com/messenger/im/home/?source=TAGHM_MAY07 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] For Sale - Elecraft KAF2 Audio Filter
For Sale - Elecraft KAF2 Audio Filter Completely assembled and operational. This unit is in excess to my needs. Less than six months on the battery. The male-female standoff is included, but J1 and J2, the 3 and 5 pin female connectors for the K2 Control Board are not. These are available from Elecraft. Assembly and Operating Instructions are included. Price: $60.00 including Priority Shipping. Contact: WB4DAD at arrl.net. 73, Skip WB4DAD K2/100 # 6626 K2/100 #6787 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KAF2 or KDSP2 for K2 #5287
Hi! I have the question. How much better working KDSP2? It has very expensive price. Are the KDSP2 really so good working that I have to pay "half K2 price"? TNX for any answer! -- 72 & 73! de UR5LAM Alexander Ponomarenko RU-QRP-CLUB #103 mailto: [EMAIL PROTECTED] www.qrp.ru ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 or KDSP2 for K2
FWIW, I operate CW only and have the KAF2 and the KDSP2 installed in my K2. For the most part I find that I only need the XFIL set to FL2 at 500Hz. However there are times when the bands are crowded or noisy and I am trying to work a weak signal. Then I find that the KDSP2 with the Denoiser and CW Filter Gain adjusted for 12db gain to be very helpful in picking up the weak stations. I really like being able to tweak and adjust the KDSP2 filters with its very large selection of settings and adjustments. 73, KI4DGH Chuck Gehring ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KAF2 - good filter for CW!!!
> -Original Message- > Last evening I finished KAF2 audio-filter for my K2. > ... > Now the weak signals on 160 and 80m-band I'm copy > very strong with KAF2! It working exellence! > > > 72!73! Alexander Ponomarenko > de UR5LAM Yes, I agree, I use it almost all of the time. My preferred filters for casual tuning is 1.00 kHz Xtal-filter combined with AF1. That gives a nice reduction in noise and also rounded filter slopes that makes it easy to hear stations even if they are a bit off. If noise or interference increases, then I switch to 0.40 or 0.10 X-tal filter. 73 Sverre LA3ZA http://www.qslnet.de/la3za/ ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 cylindrical crystal I got two.
Ivan, I don't know if there is a significant difference between the 2 crystals or not, but I suspect that either will work. The crystal is only for the Real Time Clock. Put one crystal in and keep tabs on the time display for a few days. If it is off drastically, try the other crystal. If it off by only a little bit, try adjusting C19 as indicated in the manual on page 12. The normal clock accuracy is better than 2 seconds per day. If you have an accurate frequency counter, the clock frequency should be 32768.0 Hz (measure at U3 pin 2). 73, Don W3FPR Ivin Flint wrote: > I am confused on the X1 Crystal, cylindrical 32.768 crystal. I have two. > One is labeled S573 and the other is labeled S793. I don't think there are > supposed to be two and I am not familiar with these. I gues the 793 is > closest to the 32.768 but some advice would be nice or am I overlooking > something? > > Ivin > > > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.409 / Virus Database: 270.13.71/2331 - Release Date: 08/28/09 > 06:26:00 > > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Kaf2 anti ringing mod by KI6WX
William Schmidt wrote > > I have seen mention of an anti ringing modification for the kaf2 that was > published several years ago by ki6wx. > Has anyone done this mod or know where I can find the details? The link > often mentioned no longer works. > > Thanks, > Bill WV1N > I just searched for this myself and also found the pacbell link from KI6WX broken. However I used the WayBack Machine to find an archived copy here: http://web.archive.org/web/20030329174521/http://home.pacbell.net/johngreb/kaf2_filter_modifications.pdf If this does not work for you, email me and I'll send a copy directly. 73, Bill W4ZV -- View this message in context: http://elecraft.365791.n2.nabble.com/Kaf2-anti-ringing-mod-tp7524674p7556131.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KAF2 or KDSP2 for K2 #5287
It depends on how you operate Alexander.My experience with the Ten-Tec Orion's DSP as well as external audio DSP's on the K2 convinced me not to buy the KDSP2 option for the K2. I mainly operate CW. I tune around at 800Hz bandwidth but typically operate at 150-200Hz. At such narrow bandwidths turning the DSP on and off has very little effect.On SSB and wider CW bandwidths the DSP sounds impressive. The KAF2 gives me the best bang for the buck. I forget the exact settings but I think it's around 1.4Khz for filter 1 and 200Hz for filter 2. The KDSP2 does have an operating convenience that lets it remember settings and "track" the IF bandwidth. The KAF2 defaults to "off" on power up of the K2. Tom K2TA - Original Message - From: "Alexander Ponomarenko" <[EMAIL PROTECTED]> To: "Elecraft Group" Sent: Thursday, April 06, 2006 2:38 AM Subject: [Elecraft] KAF2 or KDSP2 for K2 #5287 Hi! I have the question. How much better working KDSP2? It has very expensive price. Are the KDSP2 really so good working that I have to pay "half K2 price"? TNX for any answer! -- 72 & 73! de UR5LAM Alexander Ponomarenko RU-QRP-CLUB #103 mailto: [EMAIL PROTECTED] www.qrp.ru ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 or KDSP2 for K2 #5287
To me that's like saying "The MFJ antenna analyzer has given me nothing but trouble therefore I won't buy ANY antenna analyzer". I won't go into what company I think is gradually buying Ten-Tec as their founders die off.. Alex. On Apr 6, 2006, at 3:10 AM, Tom Althoff wrote: It depends on how you operate Alexander.My experience with the Ten-Tec Orion's DSP as well as external audio DSP's on the K2 convinced me not to buy the KDSP2 option for the K2.Tom K2TA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 or KDSP2 for K2 #5287
Actually it might be more like saying "The MFJ antenna analyzer cannot be used in strong RF fields and other analyzers that I have used cannot be used in strong RF fields so I wouldn't recommend buying an antenna analyzer to check a Field Day dipole attached to the tower of a 50KW broadcast station." I'm saying that ANY DSP radio Ten-Tec, Yaesu or Elecraft with RF or AF processing requires bandwidth to process the signal and throw away the noise. Once you get a bandwidth under 200Hz the DSP code has little to work with to improve copy and can actually degrade the signal by adding artifacts. Compare the KDSP2 to the KAF2 at 200Hz in a thunderstorm and then tell me which you prefer. Since you did not say what mode you intend to operate nor what bandwith you prefer I could only state my experience from my operating conditions. If you operated narrow bandwidth (under 200Hz) CW I suspect you would not feel the KDSP2 was worth the added expense. - Original Message - From: "Alexandra Carter" <[EMAIL PROTECTED]> To: "Tom Althoff" <[EMAIL PROTECTED]> Cc: Sent: Thursday, April 06, 2006 6:21 AM Subject: Re: [Elecraft] KAF2 or KDSP2 for K2 #5287 To me that's like saying "The MFJ antenna analyzer has given me nothing but trouble therefore I won't buy ANY antenna analyzer". I won't go into what company I think is gradually buying Ten-Tec as their founders die off.. Alex. On Apr 6, 2006, at 3:10 AM, Tom Althoff wrote: It depends on how you operate Alexander.My experience with the Ten-Tec Orion's DSP as well as external audio DSP's on the K2 convinced me not to buy the KDSP2 option for the K2.Tom K2TA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 or KDSP2 for K2 #5287
Alexander Ponomarenko wrote: I have the question. How much better working KDSP2? It has very expensive price. Are the KDSP2 really so good working that I have to pay "half K2 price"? I have both of them. Keep in mind that I am only a CW operator, so you will have to get the opinion of an SSB guy if you want to know about that! The KAF2 does nothing for SSB, while the DSP provides filtering and hetrodyne removal. The DSP has the advantage of including a noise-reduction function. It does not make it possible to copy a station that you can't copy without it, but it does make it more comfortable to copy a station that is close to the noise level. The DSP has more flexibility in selecting bandwidths and better shape characteristics than the KAF2. In practical terms, though, I don't think this translates into the ability to work stations that you could not work with the KAF2. One DSP problem is that the noise reduction, if you use it, distorts the leading edge of a weak signal which degrades copy. You need to back off the aggressiveness of the function to avoid this, which makes it less effective. A negative factor, at least in my case, is that the QSK is not as clean with the DSP installed. I've spent some time trying to clean up clicks (only in the receiver, not transmitted) that are related to the delay introduced by the DSP. I haven't succeeded. Recently, I took out the DSP and put back the KAF2. After getting used to missing the noise reduction, I found that I prefer the KAF2. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KAF2 or KDSP2 for K2 #5287
Great reply Vic, Let's widen the question to make it KAF2 or KDSP2 or NOTHING? Does the basic K2's crystal filtering work well enough that you (any of you) would be happy with no AF filtering or does the AF/DSP filtering add enough that you wouldn't want to be without it? - Keith KD1E - -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Vic K2VCO Recently, I took out the DSP and put back the KAF2. After getting used to missing the noise reduction, I found that I prefer the KAF2. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 or KDSP2 for K2 #5287
I find the crystal filter more than adequate for my type of CW operation and have felt no need to add any audio filtering. 73, Dave N7AF - Original Message - From: "Darwin, Keith" <[EMAIL PROTECTED]> To: "Elecraft Group" Sent: Thursday, April 06, 2006 9:14 AM Subject: RE: [Elecraft] KAF2 or KDSP2 for K2 #5287 Great reply Vic, Let's widen the question to make it KAF2 or KDSP2 or NOTHING? Does the basic K2's crystal filtering work well enough that you (any of you) would be happy with no AF filtering or does the AF/DSP filtering add enough that you wouldn't want to be without it? - Keith KD1E - ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 or KDSP2 for K2 #5287
Darwin, Keith wrote: Let's widen the question to make it KAF2 or KDSP2 or NOTHING? Does the basic K2's crystal filtering work well enough that you (any of you) would be happy with no AF filtering or does the AF/DSP filtering add enough that you wouldn't want to be without it? Selectivity has two functions: to reject QRM and to increase the signal/noise ratio by narrowing the bandwidth. The crystal filter in the K2 is usually sufficient for QRM reduction, with the help of the "built-in wetware filter" in the human brain. However, it *is* advantageous to have the narrowest practical bandwidth when receiving a weak CW signal; the signal's energy is concentrated in a very narrow range of frequencies -- maybe 50 Hz is required for usual CW speeds -- while the noise is evenly distributed over the bandpass of the receiver. I find it useful to have a narrow audio filter available for this reason. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KAF2 or KDSP2 for K2 #5287
When I had narrow filtering in my Omni V I found that S/N did not increase as bandwidth decreased. Instead, the noise began to sound like signal since both were at the same frequency. Add some filter ringing to the mix and sometimes the narrowest settings made copy worse. As always, I reserve the right to change my mind as I get more operating time with various rigs :-) - Keith KD1E - -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Vic K2VCO Sent: Thursday, April 06, 2006 12:54 PM To: Elecraft Group Subject: Re: [Elecraft] KAF2 or KDSP2 for K2 #5287 Selectivity has two functions: to reject QRM and to increase the signal/noise ratio by narrowing the bandwidth. The crystal filter in the K2 is usually sufficient for QRM reduction, with the help of the "built-in wetware filter" in the human brain. However, it *is* advantageous to have the narrowest practical bandwidth when receiving a weak CW signal; the signal's energy is concentrated in a very narrow range of frequencies -- maybe 50 Hz is required for usual CW speeds -- while the noise is evenly distributed over the bandpass of the receiver. I find it useful to have a narrow audio filter available for this reason. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KAF2 or KDSP2 for K2 #5287
Same here, Dave. I operate for fun. When signals are so bad I have to crank in $300 filters, it's time to find someone stronger or QRT. I can't imagine a QSO so important that I have to strain to hear it. I had a KAF2 and had a chance to sell it to save for a KDSP2. I found I could still do what I do with the built-in crystal filters. Others have other requirements, of course. Eric KE6US -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dave Lowenstein Sent: Thursday, April 06, 2006 9:49 AM To: Elecraft Group Subject: Re: [Elecraft] KAF2 or KDSP2 for K2 #5287 I find the crystal filter more than adequate for my type of CW operation and have felt no need to add any audio filtering. 73, Dave N7AF - Original Message - From: "Darwin, Keith" <[EMAIL PROTECTED]> To: "Elecraft Group" Sent: Thursday, April 06, 2006 9:14 AM Subject: RE: [Elecraft] KAF2 or KDSP2 for K2 #5287 Great reply Vic, Let's widen the question to make it KAF2 or KDSP2 or NOTHING? Does the basic K2's crystal filtering work well enough that you (any of you) would be happy with no AF filtering or does the AF/DSP filtering add enough that you wouldn't want to be without it? - Keith KD1E - ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 or KDSP2 for K2 #5287
Darwin, Keith wrote: When I had narrow filtering in my Omni V I found that S/N did not increase as bandwidth decreased. Instead, the noise began to sound like signal since both were at the same frequency. Add some filter ringing to the mix and sometimes the narrowest settings made copy worse. It depends on the type of noise. Impulse noise, the kind that noise blankers work best with, has its duration lengthened by a sharp filter, which makes it worse. Atmospheric noise, like that caused by thunderstorms is particularly bad because it contains sharp rise-time pulses but they are distributed in such a way that noise blankers generally don't work on it. But many types of noise are reduced (relative to the signal) by narrowing the bandwidth. The narrow filter is just another tool in the toolbox that sometimes is useful. Actually, I have the KAF2, an OHR SCAF, and a Timewave DSP 59+ all hooked up, and under noisy conditions it's interesting to see the effects of each of them. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KAF2 or KDSP2 for K2 #5287
Keith, KD1E wrote: When I had narrow filtering in my Omni V I found that S/N did not increase as bandwidth decreased. Instead, the noise began to sound like signal since both were at the same frequency. Add some filter ringing to the mix and sometimes the narrowest settings made copy worse. As always, I reserve the right to change my mind as I get more operating time with various rigs :-) --- I, too, have had Keith's experience. Over the years I use narrow filters ONLY when absolutely needed to remove extremely loud QRM. Most often I listen to CW using my >2 kHz OPT1 filter. Perhaps it's a result of having learned to listen to CW as an SWL and Novice many years ago using regenerative receivers and simple superhets for which 6 to 8 kHz bandwidths were typical. And the CW bands were a lot more crowded then, typically, than today. That doesn't mean that I didn't have exotic filters. The most exotic filter yet developed is the one between our ears. It has to be trained, however. For speech, we do that instinctively from childhood by listening. Who hasn't picked out a single voice across the room at a crowded party and heard every word in spite of a dozen or more other voices also carrying on at the same time. It only gets really hard when some character starts shouting in our ear so we can't hear the other voice through the hubbub. We can learn to do the same with CW. Of course, the first step is to avoid having the signal we want to hear made quieter, which is why I avoid AGC for most listening. It responds to the aggregate of signals in the bandpass. I want it to leave my volume where I set it. With most receivers I like having a hard limiter that doesn't let any signal exceed a certain threshold regardless without affecting the other signals. I've never fashioned one for my K2 because I haven't found that the K2 seems to need it. Very, very rarely do I find the copy better at narrower bandwidths for just the reason Keith observes: the narrower bandwidths tend to concentrate all the energy in the bandpass of the filter. It's like trying to listen to someone in a crowded room when a whole group of people are talking at about the same volume, with the same basic pitch to their voices, with similar inflections and pace to their speech (the bane of the keyer!!). Another advantage of using wide bandwidths is being aware of what's going on around the frequency too. Unless the other station is really whizzing along requiring my full attention to avoid missing words, I can keep track of several QSO's around the frequency, again just like being a party. One doesn't have to catch every word to have a good sense of what's being said here and there while still paying quite close attention to the person I'm talking with. It's something that almost anyone can learn with practice. And you already own the filter! Ron AC7AC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KAF2 or KDSP2 for K2 #5287
Keith, It depends on whether you want to get rid of those nasty carriers or bust them. Some people use these radios on SSB. 73, Kurt ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAF2 or KDSP2 for K2 #5287
One nice feature of the DSP for CW operation is the ability to open up the filters for bands that seem to be dead or have little activity. You set the crystal filter to its widest bandwidth and put the DSP in LP (its widest setting). Activate the denoiser. The band is quiet, background noise heavily suppressed. If a signal pops up anywhere in the passband -- even a weak one -- the DSP nearly instantly builds a narrow filter around it. Somewhat like squelch on an FM radio, you hear the signal when it is there, and it is really quiet when no signals are present. It really helps reduce listening fatigue for monitoring. Now, with the current sunspot situation, I am sure this never happens, but if it did... :-) 73, Lyle KK7P ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
