Re: [Elecraft] OT: Well-being check
On 15/03/2020 12:10, Lyn Norstad wrote: > I have also opted out of all my other group activities, and in fact most of > them (ARES/RACES/Skywarn/etc.) have gone into "postpone" mode. In several > other cases we are also looking at setting up virtual meetings and will > conduct our business either by conference call or over internet channels. > I'd be curious to know how you all are coping with this situation. The RSGB was due to hold its thrice-yearly face-to-face meeting of the Volunteer Leadership Team (VLT) yesterday, consisting of board members, HQ staff, committee chairman, honorary officers and regional representatives. Instead, because of Covid-19 concerns, we ran it as a video conference using the Cisco Webex system. It worked very well, despite hardly any of the 34 participants having even heard of it before. 73, Richard G4DYA __ 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] KPA500...standby vs. operate
Just measured the power consumption of my KPA500: Standby 10 W / 16 VA Operate 12 W / 16 VA 73, Richard G4DYA On 27/10/2019 16:59, Don Wilhelm wrote: > John, > > I do not think there is any harm in leaving it in operate. If you are > really "pinching pennies" on the electric bill, you might find a small > advantage to switching it to standby. > > 73, > Don W3FPR > > On 10/27/2019 12:36 PM, Macy monkeys wrote: >> I am in and out of the shack all day with various nets and ragchews. >> Is there any advantage to putting the amp into standby between >> QSOs...or should I just leave it in operate? __ 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] We Need More Power
On 27/09/2019 16:03, Bob McGraw K4TAX wrote: [Tedious eulogy snipped] QRP. It isn't big and it isn't clever. 73, Richard G4DYA __ 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] Line output
On 23/05/2019 11:55, G3YHM via Elecraft wrote: > For some reason my K3 has decided to change the level of the Line out when I > adjust the AF Gain control. Are my fingers in the menu to blame? How can I > return it to normal? Go to CONFIG:LIN OUT and if it says "=PHONES" then tap 1 to return it to "nor 010" (or whatever fixed gain value you've set). 73, Richard G4DYA __ 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] K3s Notch Filter
On 12/05/2019 23:22, Richard wrote: > Is there any way to make the manual notch filter really narrow to keep morons > running legal limit on FT8 from wiping out my waterfall and making my ears > bleed? > > Don’t like what AGC does. Probably not, but both the notch filter and AGC are the wrong tools for the job. The WSJT-X decoder has huge dynamic range (16-bit 48000 samples/sec input decimated to 12000 samples/sec, so over 90 dB), so it's best to use the RX as a dumb converter and let the decoder deal with it. It's the right tool for the job. This means keeping the bandwidth of the RX at least as wide as the band displayed on the waterfall and avoiding the use of anything in the K3 that might improve the signal for aural CW/SSB reception such as notch filtering, equalisation, noise blanking and noise reduction. AGC should be avoided because the level of every FT8 signal in the passband will be modulated by fading on the strongest signal, which makes the decoder's job harder. The AGC recovery time may also cause the loss of more symbols than necessary when there's impulsive interference such as lightning static. The trick is to set the gain manually through the chain, from the RF gain knob on the RX right through to the waterfall settings, so that levels are matched and no one stage in the chain is either clipping strong signals or pushing weak ones below the noise floor. If you ears are still bleeding then turn the AF gain down. If the WSJT-X 'thermometer' is in the red turn the RF gain down. If the waterfall isn't showing both the weakest and strongest signals properly, adjust the waterfall zero and gain controls accordingly. The "morons" are not running legal limit to cause you trouble. We're doing it (for example) because the loss on the 160m path between G and JA is so high that we need legal limit to get even a faintly detectable signal at the other end. 73, Richard G4DYA __ 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] Will there be a K4
On 25/03/2019 00:14, Eric Swartz WA6HHQ - Elecraft wrote: > Inquiring minds want to know: > What would you all like to see as a “K4” ? Something like the Flex / Anan SDRs, but with RX performance to match the K3S. So maybe a 24-bit direct-sampling SDR, if such a thing is even possible, with a open-source cross-platform application to drive it. (For me, Windows = showstopper.) 73, Richard G4DYA __ 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] K3S noise blanker: FMOP OTHR
Hi all, Has anyone had any success using the K3S noise blanker to get rid of the new-ish FM-on-pulse types of over-the-horizon radar? I've tried various settings but nothing seems to make any discernable difference. There seem to be two main systems, both Russian: 'Sunflower', a surface-wave OTHR, which typically occupies about 40 kHz of bandwidth on the lower HF bands and puts out 43 pulses/sec and has been causing a lot of interference on 3.5 and 5 MHz. 'Container', an ionospheric OTHR, which (at present) occupies about 14 kHz of bandwidth, mainly on 14 MHz and puts out 40 pulses/sec and has spent the last few days centred on 14142, 14228 and 14332 kHz. 73, Richard G4DYA __ 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] 160 unusual conditions.
Yes, Heard ZL4AS yesterday using FT8 between 0815 and 0825. Heard him again this morning between 0812 and 0836. Worked him at 0818, just after he'd given another G station +17! Path length 19069 km. He gave me +02, I gave him -12, but he was competing with a passing train powered by an iced-up 25kV catenary 100m away from my Rx loop ... 73, Richard G4DYA On 31/01/2019 13:46, Dave Sublette wrote: > Aren't ZL and G just about the antipodal points from each other? > > Dave, K4TO > > On Thu, Jan 31, 2019 at 8:40 AM Tom Boucher wrote: > >> Just a note to those that may be interested: >> For the last two days, signals from ZL3IX at Eu sunrise have been peaking >> S9. This morning Greg was a good 579 running just 20 watts, before he >> turned his amp on. >> >> 73, >> Tom >> G3OLB __ 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] FT8 Upgrade
On 29/11/2018 00:54, Jim Brown wrote: > On 11/28/2018 3:28 PM, Mike Harris via Elecraft wrote: >> I installed v2.0.0-rc4 which locks you into 77 bit messages and found >> very little decode action on my waterfall so I reverted to v2.0.0-rc3. > > If you're not part of the solution, you're part of the problem. :) The -rc* versions are release candidates, i.e. beta packages for testing. People who use them are expected to report any anomalies they find on the relevant mailing list. If you don't want to test and report bugs, you should not be using (and there is no point in you using) the -rc* packages. Stick with the recommended releases: 1.9.1 until December 10 and then upgrade to 2.0.0. 73, Richard G4DYA __ 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] P3 SVGA - measuring occupied bandwidth
On 22/05/18 19:57, Jim Brown wrote: > Yes. AND in the hands of a knowledgeable engineer/technician, a near > lab-quality test instrument, with a display that can easily be > calibrated to the signal level at the antenna input. I've used it to > measure occupied bandwidth of transmitted signals to precision of a few > Hz, and the SVGA board, with it's separate, higher res FFT, improves > that to one Hz. Jim - in this context, are you using the definition of "occupied bandwidth" as in ITU RR 1.153, i.e. 99% mean power? If so, how do you do that with the P3 SVGA? 73, Richard G4DYA __ 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] K4
On 19/05/18 03:18, Jim Brown wrote: > On 5/18/2018 4:38 PM, Richard Lamont wrote: >> On 19/05/18 00:15, k...@roadrunner.com wrote: >> >>> What features would your K4 have? >> Compared to the K3S: >> >> RX maximum audio bandwidth increased from 4 kHz to 6 kHz. > > Why? It's a ham transceiver. To be able to decode multiple digital signals at once. Also to diagnose intruder signals. And yes, occasionally, to listen to AM broadcasts, without having to buy something else as well when I've just drained my bank account to buy a K4! There's no inherent reason why this needs to compromise the performance as a purely ham rig - it just makes it more useful for one or two other things as well. >> More macro buttons. > > Can't argue with that, but the radio would need to be bigger. Have you > studied the manual for the many ways to save presets of frequency, mode, > etc. ? Lots of things we want to assign to macros can be solved that way. Yes thank you. Bigger isn't a problem for me. If it is for you, don't buy a K4, stick to the K3(S)! >> Higher resolution S-meter (more bargraph segments). > > Why is that important? Because it's often useful to be able to see small changes in signal level, which you can't do at 5-6 dB per segment. For example when rotating an antenna. >> 1/4" jacks instead of 3.5mm ones. > > Why? Quality of jacks and plugs? Simply buy good quality plugs > (Neutrik and Switchcraft are the good brands) and make your own cables. > And if you want those bigger jacks, the radio would have to be larger. I always buy Neutrik if I can, but IMHO there is no such thing as a good quality 3.5mm jack plug. They are just too small and flimsy. >> Longer&fatter 13.8V power cable > > Buy a Power Pole connector pair, buy the size of cable you want, pull > out your soldering iron and make any power cable you want. Obviously, but if I'm buying a K4 it would nice to have a cable in the box that is long enough to reach from the rig to the PSU. >> 24-bit digital audio i/o, without going D-A-D. > > To what benefit? To get the same dynamic range on the audio I/O that already exists on the 15 kHz IF. I'd like to be able to examine received signals using an audio spectrum analyser with the maximum available dynamic range. >> Steeper filter slopes on SSB TX passband to widen audio while staying >> within 3 kHz occupied bandwidth (cf IC7300). > > Buy and plug in a 8-pole 2.8 kHz roofing filter to replace the 2.7 kHz > filter. If you can tell the difference between that and 3 kHz bandwidth > you've got better ears than me. Further, any audio content below about > 400 Hz is wasted in a communications circuit. I already have the 2.8 kHz filter, and I'm more interested in the slope at the top end than the bottom. Some other rigs seem to do better by doing the slope in DSP and using the roofing filter for just that - roofing. (The 6 kHz filter, if fitted, could be used here.) As for content below 400 Hz, you're right for DXing, but if you're trying to have a normal conversation it's much nicer if it goes somewhat lower. 73, Richard G4DYA __ 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] K4
On 19/05/18 00:15, k...@roadrunner.com wrote: > What features would your K4 have? Compared to the K3S: RX maximum audio bandwidth increased from 4 kHz to 6 kHz. More macro buttons. Higher resolution S-meter (more bargraph segments). 1/4" jacks instead of 3.5mm ones. Longer&fatter 13.8V power cable 24-bit digital audio i/o, without going D-A-D. Steeper filter slopes on SSB TX passband to widen audio while staying within 3 kHz occupied bandwidth (cf IC7300). 73, Richard G4DYA __ 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] KPA1500 on AM
On 15/02/18 11:12, Bill wrote: > How well will the KPA1500 do on AM during very long-winded QSOs? I > currently use my KPA500 on AM and it does fine - albeit a little noisy > in the fan department. For information only: The K3 garners excellent > audio reports on AM. To prevent flat-topping at 100% mod, for AM the carrier power should be no more than 25% of the peak envelope power. So I would imagine both amplifiers would do AM without the slightest difficulty. (I don't work AM myself so haven't tried it.) 73, Richard G4DYA __ 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] KPA1500 duty cycle
The FT8 parameters were tweaked slightly during the beta phase prior to the release of WSJT-X 1.8.0, and the TX time was reduced to 12.64 sec, so the duty cycle is now about 42%. 73, Richard G4DYA On 15/02/18 01:22, Dennis Moore wrote: > Specification is 13.48 sec TX, 16.52 sec RX, 45% Duty Cycle. > > Source: http://qrznow.com/new-digital-mode-from-k1jt-ft8/ > > 73, Dennis NJ6G > > > On 2/14/2018 17:07, Tom-KQ5S wrote: >> I believe FT8 is 13 sec TX, 2 sec decode and then 15 sec RX for a >> total of >> 17 sec non-TX so you have 13 sec TX and 17 sec RX. Much less than 50%. >> >> - >> 73, >> Tom - KQ5S >> >> On Wed, Feb 14, 2018 at 6:51 PM, Jim Brown >> wrote: >> >>> And even this is conservative -- JT65 is 48 sec TX and 72 sec RX, so 40% >>> duty cycle. FT8 and MSK144 have equal TX and RX times, so 50% duty >>> cycle. >>> The TX period for MSK144 can be varied from 5-30 sec, but TX and RX >>> times >>> are always equal. >>> >>> 73, Jim K9YC __ 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] KPA500 Questions about power and efficiency
On 16/01/18 23:52, Don Wilhelm wrote: > Bottom line, the Elecraft amplifiers will do maximum power at a 50% duty > cycle all day long. You should reduce the power for long winded AM > transmissions, but otherwise you can run maximum power. If you're running AM, 500W PEP is what you get with 125W carrier and 100% modulation. Run over 125W carrier and you will flat top and splatter. (In theory. I don't use AM so haven't tried it.) 73, Richard G4DYA __ 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] O.T. Morse is not dead, at least in the U.S. Navy
On 18/11/17 05:43, Mark via Elecraft wrote: > Re: http://www.navy.mil/submit/display.asp?story_id=92864 > > So, "The rumors of my death have been greatly exaggerated"??? No, unfortunately for the CW evangelists, they haven't been. The rumor that *is* being greatly exaggerated is that the US Navy is 'reverting to Morse' for its communications. There's no suggestion of this in the press release cited. What is happening is that the US Navy is *continuing* to train *intercept operators* to read Morse. That is all. If you don't believe me, read the press release. 73, Richard G4DYA __ 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] O.T. Morse is not dead, at least in the U.S. Navy
On 18/11/17 03:45, Ron D'Eau Claire wrote: > http://www.navy.mil/submit/display.asp?story_id=92864 The people being trained by the US Navy to read Morse are intercept operators. "Morse code is just one tool that cryptologic technician (collection) Sailors use as members of the Navy's Information Warfare community to perform collection, analysis and reporting on communication signals." There's nothing in this press release to suggest that the US Navy is reverting to Morse for two-way communication. 73, Richard G4DYA __ 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] WSJT-X K3/K3s hanging as Tx
On 13/11/17 23:10, Don Wilhelm wrote: > The proper place to cure "RF in the shack" problems is in your antenna > system. A good common mode choke (many call it a balun) in the antenna > feedline and running the feedline at right angles to the radiator > (assuming a dipole) to keep the feedline from picking up radiation from > the radiator. If that physical configuration cannot be avoided, then an > additional common mode choke at the shack entry point can help. I agree and have done all that. I have a doublet, centre-fed with 300 ohm ladder line dropping vertically to a DX Engineering choke balun (which contains three binocular ferrite chokes in series). For good measure, I have a Fair-Rite #31 clamp-on ferrite on the co-ax next to it. The co-ax then runs in a duct buried about 350mm deep to the house, where it goes up the external wall and then through it about 4m above ground level into the (upstairs) shack, where there's another #31 clamp-on ferrite. > With effective common mode chokes on the antenna and feedline, you > should not have to use ferrites on every cable in the shack Well, my experience disproves your hypothesis. While common-mode current on the feedline is often a problem, it isn't necessarily the only problem. The problem here is radiated RF, not conducted RF, being picked up by the USB cables. It's only to be expected when the shack is in the antenna's near field. 73, Richard G4DYA __ 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] WSJT-X K3/K3s hanging as Tx
On 13/11/17 20:18, Jim Brown wrote: > On 11/13/2017 11:12 AM, Gary Smith wrote: >> For those using WSJT-X, sometimes I find >> the K3s is locked as transmit but there is >> no RF being sent and no Rx from the K3. > > I've been using WSJT-X since it was first introduced several years ago, > and I've never had this problem. I've always used VOX to put the rig in > TX mode, as I do with SSB and all digital modes. I've often run with a > power amp that uses a vacuum relay for T/R switching, and there's > sufficient delay within the K3 and K3s for the amp's T/R relay to switch. You may be putting the performance of your station at a disadvantage with that approach, compared to using WSJT-X with CAT to keep TX audio in the range 1500-2000 Hz. The roofing filter may have a fair amount of group delay inequality at the edges of the passband, which can lead to inter-symbol interference on digital modes. I don't know how serious, if at all, this is in practice, but I know one very clever engineer who regards it as enough of a problem to have had a custom roofing filter manufactured for his K3 to reduce it. He mainly works EME with JT65. 73, Richard G4DYA __ 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] WSJT-X K3/K3s hanging as Tx
On 13/11/17 19:12, Gary Smith wrote: > For those using WSJT-X, sometimes I find > the K3s is locked as transmit but there is > no RF being sent and no Rx from the K3. > > Anyone experience this and figure out how > to prevent it? I've seen this occasionally too. I've had a number of odd malfunctions of USB-connected devices in the presence of RF. I now have fitted ferrite rings, with as many turns of the cable as would fit, at the computer end of the all the USB cables going into the PC. 73, Richard G4DYA __ 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] The Gentlemen's Band
On 29/10/17 23:19, Jim Brown wrote: > The "gentlemen" most recently have gotten their tit in wringer about > FT8. When CW came along, the spark operators said is was the end of amateur radio as we know it. When AM came along, the CW operators said it was the end of amateur radio as we know it. When SSB came along, the AM operators said it was the end of amateur radio as we know it. Plus ça change . . . 73, Richard G4DYA __ 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] K3S and FT8
On 31/07/17 20:19, Wes Stewart wrote: > I noted that when my transmit interval occurred, there seemed to be > about a one and a half second delay before the K3 began to transmit. I > began an exchange of email with Bill, G4WJS, about this issue. I quote > from one of his: > > "If you are seeing a 1.5s delay then that is because CAT commands sent > before PTT, even if PTT is "virtual" due to using VOX, are taking > roughly that long. The K3 series is problematic in that certain CAT > commands can take a long time to complete On 12/8/17, Bill G4WJS posted a message to the hamlib-developer list concerning a patch to k3.c to "Take out unnecessary delays in K(X)3(S) back end". This was incorporated into versions of hamlib subsequently distributed with WSJT-X. I've found that it greatly improved control of the K3S. So, use WSJT-X 1.8.0-rc2 or later, and use the version of hamlib/rigctl/rigctld distributed with it. 73, Richard G4DYA __ 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] Specs KIO3-B internal sound card
On 20/09/17 05:06, Jim Brown wrote: > WSJT-X operates at 48 kHz 16-bit, no matter how exotic your > sound card, the ~90 dB dynamic rangeand 5 kHz audio BW are more than > sufficient for the audio I/O for the digital modes used in ham radio. When operating JT65 or FT8 on HF, and having (as recommended) turned AGC off and adjusted the K3S's gain to set the level to 30 dB on WSJT-X's 'thermometer' on white noise, I've had strong signals drive the system over the clipping point on HF. This can occur with either a very strong local signal or 1000km+ sporadic-E. IMHO the 16-bit dynamic range of the KIO3B and WSJT-X's internals are not quite good enough for these fortunately rare occurrences. Another 10 dB would suffice, but achieving it would of course require changing the whole chain from ADC onwards. 73, Richard G4DYA __ 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] Specs KIO3-B internal sound card
On 19/09/17 22:05, Udo Langenohl - DK5YA wrote: > I'm looking for specs of the internal sound device which is part of the > KIO3B board but couldn't find any on the Elecraft web site. > Anybody out there who's got detailed information? > > I'm just preparing all the stuff we gonna take with us for our 144/432 > EME DXPedition to DU (DX7EME) in November and I would like to reduce > parts we have to carry as much as I can. We have two K3 with us, usually > connected to very high quality external sound devices (Focusrite > Scarlett, Delta 44). Since we are doing moonbounce (JT65b) and each and > every dB counts we are focussing on lowest noise possible in our sound > devices. If the internal sound card of the KIO3B will meet our needs we > could propably reduce weight and lower all the cable mess a lot. While EME needs every last fraction of a dB of RF performance, the same is not true of an audio interface used for JT65. In this respect, EME is less demanding than day-to-day HF operation, where the passband may have 20 or more signals of widely varying strengths. As long as you follow the WSJT-X authors' advice about setting levels, a consumer-grade audio interface such as that in the KIO3B is more than adequate. A studio-quality audio interface will add nothing to the performance of your station. WSJT-X requires audio input as 16-bit linear PCM, sampled at 48 kHz. (The next thing it does is to downsample to 12 kHz.) So there's no advantage in greater bit-depths or sampling frequencies. 73, Richard G4DYA __ 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] 630 meter band open for use
On 16/09/17 03:16, Edward R Cole wrote: > But seriously no 3-KHz phone should be used since one QSO would occupy > nearly 50% of the 7-KHz wide band. We've had these bands in Europe for years and AFAIK nobody uses voice modes. The IARU R1 bandplan suggests a maximum bandwidth of 500 Hz. 73, Richard G4DYA __ 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] Noise Blankers
On 03/09/17 20:38, Wes Stewart wrote: > The K3S blanker is slightly better than > useless. When I set it aggressive enough to be audibly useful, FT8 > decodes multiple signals at 120 Hz intervals, which upsets sequencing. That's an inevitable consequence of how a noise blanker works. It removes power line noise by muting reception 120 (or 100) times a second, corresponding to peaks in the power line voltage when the arcing occurs. If you chop an audio tone up at 120 Hz, you are amplitude modulating the tone with a 120 Hz waveform. That produces sidebands either side of the tone 'carrier'. This is why you should never use a noise blanker with FT8 and similar modes. The best way to use a rig with WSJT-X is, generally speaking, to make the computer do as much as possible and make the rig do as little as possible. Treat it more or less as a dumb transverter. Don't use the noise blanker, don't reduce the bandwidth below about 2.5 kHz, don't use the notch filter. WSJT-X's decoder works best if you just get the level about right and let it deal with the QRM. 73, Richard G4DYA __ 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] Humming KPA500
On 02/09/17 15:52, Clay Autery wrote: > Loose PS transformer? The assembly manual for the kit suggests that, although it isn't necessary, if you have a torque wrench you should tighten it to 55 inch-pounds. 73, Richard G4DYA __ 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] UPS Can Be a Noise Source
On 31/08/17 22:56, Jim Brown wrote: > On 8/31/2017 11:35 AM, Tox wrote: >> I had a couple racks of APC >> SmartUPS 2000 units with daisychained batteries to give extended >> holdup to >> a couple of racks of telecom and server hw. No clue how RF noisy those >> units are, though. > > All of the APC units for which I've seen spec sheets are FCC Part 15 > Class A (the industrial spec, ILLEGAL to sell for residential use, > roughly 20 dB worse than Class B). I had a SmartUPS 750, and it was very bad. Put out crud all the way from VLF to VHF. I threw it away in the end. In the shack I use a much older APC Back-UPS 500 for the computer, which doesn't seem to cause any problems. I've had to replace the battery every 3-4 years, but that's to be expected. 73, Richard G4DYA __ 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] Again - logging program...
On 21/08/17 06:53, Bob Nielsen wrote: > I'm a somewhat casual contester but am quite happy with the contest > support in RUMLogNG. Tom keeps adding additional contests. > > I wish there was a Linux equivalent (or close) to N1MM or RUMLogNG. For > non-contest stuff cqrlog isn't bad. Before I got the mac I used TLF, > which worked fine but lacked a GUI. The latest version of CQRlog (2.1.0), released on 6th August 2017, has added a simple contest logging window. It won't satisfy industrial contesters but may be good enough for casual use. https://www.cqrlog.com/ 73, Richard G4DYA __ 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] Make this email list more manageable - a forum instead?
On 19/08/17 13:12, Barry wrote: > As Elecraft has grown, this email list has gotten quite a bit more traffic. > It's not easy to manage, especially with the increasing number of products > all lumped in. > > Why not convert it over to a forum? Use vBulletin or similar, and every > product can have its own subcategory, and it would be much easier to pick > and choose topics of interest. With respect, I disagree. This email list is easy enough to manage if you use a decent email client, such as Thunderbird. I read 19 different lists and groups this way, some of them high volume like this one. For each list, I have filters that automatically sort incoming messages into one of 19 folders, leaving just non-list stuff in my default inbox. I then view the lists in 'threaded' mode, and if there's a thread I'm not following, or if I haven't got time to read the list at all that day, I just 'mark thread as read' or 'mark all as read'. A web forum does none of this, and you can only go through the messages as fast as the forum's web server will let you. It's a thoroughly inferior way of working. That said, I wish this list was restricted to Elecraft-related topics only - there's far too much noise IMHO. 73, Richard G4DYA __ 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] K3: Odd ALC behavior
On 04/08/17 19:33, Brian Hunt wrote: > Here's some followup: > FLDIGI shows the "pumping" affect with carrier tones of 500, 1000, 1500, > and 2000 Hz. > WSJT-X 1.8 shows the "pumping" affect with carrier tones of 1000, 1500 > and 2000 Hz (couldn't select 500 Hz). > > The affect is very narrow with frequency. 10 Hz either way and the > output and ALC display and MON output is rock solid. Changing the K3 > filter center frequency has no effect on the above. This looks like a beat between the modulating frequency and some sampling process associated with the ALC meter. 73, Richard G4DYA __ 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] How to keep track of grid squares logged?
On 30/07/17 19:12, Wayne Burdick wrote: > On 6 m, everyone uses grid squares when reporting their QTH. Is there a web > tool or spreadsheet available somewhere that allows you to conveniently keep > track of which ones you’ve worked? I just used a paper map and a highlight marker. This worked infallibly right up to the senior moment when I put the map in the shredder. 73, Richard G4DYA __ 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] K3S Shift Setting for WSJTX
On 05/07/17 01:33, Jim Brown wrote: > Richard -- I'm a Fellow of the Audio Engineering Society, BSEE, retired, > worked in both audio and broadcasting. I'm VERY aware of distortion > products and the mechanisms that produce them. I also TAUGHT this stuff. > Your concerns are overblown. Thank you for your rigorous, quantified mathematical proof. Clearly the JT65 transmitted harmonics I've seen, as received on my K3S, which blotted out the weak JT9 station I was trying to work at around -27, must have been a figment of my imagination. 73, Richard G4DYA __ 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] K3S Shift Setting for WSJTX
On 04/07/17 22:56, Jim Brown wrote: > Richard, > > Not nonsense at all. WSJT-X is VERY robust in the ability to reject > this sort of QRM. The screen grab below is a great example. I continue > to be amazed by the decoding in WSJT-X. About 10 days ago, W0OGH > accidentally got out of sync with JA7QVI, calling on his TX cycle, and > on the same frequency. As this screen grab clearly shows, W0OGH was 9 dB > stronger on the 0053Z cycle and 12 dB stronger on the 0055Z cycle, yet > both signals were decoded without error! > > During a wonderful 6M opening this past Friday evening west coast time, > I had a LOT of JT65/JT9 passes with more than 20 clean decodes on each > pass. I regularly see decodes in the -20 to -28 range, even with very > strong signals capturing the AGC. It's only necessary to keep peak > signal levels to the A/D below digital clip. That's receive levels. I was talking about Tx distortion. While it's certainly the case that WSJT-X's two-pass decoder can *sometimes* decode weak signals underneath overlapping strong ones, this isn't always the case and it can never be a magic cure all. That would have Claude and Harry spinning in their graves. Any kind of spurious crud will raise the noise floor, which is always a bad thing. Also, harmonics really clutter the waterfall. A JT65 signal on, say 700 Hz, will appear between 700-878 Hz. The second and third harmonics will appear between 1400-1756 and 2100-2634 Hz. Just one distorted JT65 signal easily mess up over a kHz of bandwidth in total. With a busy band this can turn the display into an incomprehensible mush. Also, audio harmonics of JT65 signals can spread into the part of the band used by JT9, which does not have a two-pass decoder. The WSJT-X developers are a *very* clever team of 25 people, led by a Nobel-prize winning professor of physics at Princeton, who have considered all this stuff over many years with a forensic, mathematical rigour of the kind that most of us can only guess at. If they say that it's a good idea to keep TX audio above 1500 Hz, I think I'll trust their word over yours. 73, Richard G4DYA 73, Richard G4DYA __ 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] K3S Shift Setting for WSJTX
On 04/07/17 19:38, Bob McGraw K4TAX wrote: > One anomaly which I've just observed with my K3S. I did set the > software as suggested for SPLIT mode for WSJT-X / JT-65. The radio > followed as expected. I made a few contacts successfully with this > configuration. When I closed WSJT-X I noted it left the radio in SPLIT > mode. I can just see all of the confusion and frustration not to > mention unintentional QRM created by this occurrence. Another trap to > watch for. > > Probably in my case, even a better reason not to use SPLIT. In other > words, it isn't idiot proof and I've been accused as being as dumb as a > box of rocks. I use a macro to unset all the WSJT-X-specific settings on my rig when I switch to another mode. Among other things it unsplits and turns AGC back on. 73, Richard G4DYA __ 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] K3S Shift Setting for WSJTX
On 04/07/17 18:37, Jim Brown wrote: > The split mode in WSJT-X is simply a crutch for those who don't know (or > don't care) how to set audio levels so that distortion is not produced > in the audio chain. Sorry, but that's nonsense. With a strong signal, just 1% distortion will produce audio harmonics that are only 40-ish dB down on the fundamental. That's plenty to cause QRM. With these modes it's possible to have work a station that's 60 dB down on another just a few Hz away. WSJT-X, being based on 16-bit digital audio, has an inherently high dynamic range. The split mode exists (a) to enable people to work over a wider range of frequencies than a single SSB channel, and (b) to ensure that the Tx audio frequency is always at least 1500 Hz, ensuring that *low-level* harmonics get filtered out. Even with a clean TX and audio levels set just so, it's well worth having that extra filtering in place. 73, Richard G4DYA __ 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] Raspberry Pi, K2 and WSJT-X questions
On 03/07/17 21:37, Elmore's wrote: > Has anyone figured out how to control a K2 from RPi running WSJT-X (or > FLDIGI,etc.)? > > Also, has anyone been able to run a digital program using a USB soundcard? I > have a Star Tech 7.1 connected to my RPi. At the moment I am trying to get it > to work with WSJT-X. > > I am running Debian Jessie. > > The sound card is recognized by the OS. When I run WSJT-X and select the > Audio tab and select the Input drop down, there is a list of 22 sound cards > none of which is the USB card. A similar issue exists on the Output > selection. I don’t understand what I am seeing. How do I get to see the USB > card in WSJT-X? > > Note that I have made forum postings on WSPRnet and RPi ham Yahoo groups > without yet getting a solution. > > I hope someone can help with this very frustrating situation. Also note that > this is my first experience with a RPi and my Linux knowledge is limited. The soundcard you're looking for may appear under a different name. Try looking in WSJT-X File->Settings->Audio for one that begins "alsa_input.usb" for the WSJT-X input device, and "alsa_output.usb" for the WSJT-X output device. 73, Richard G4DYA __ 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] Kenwood microphone
On 27/06/17 09:56, G4GNX wrote: > Is anyone using a Kenwood MC-50 (dynamic) as a desk mic? If so, what settings > are you using on the K3? > > I am finding that setting FPl or FPH and tapping ‘7’, then turning the mic > gain way high, is the only way to get 5 bars on the ALC. I don’t think I > should need to have the extra gain switched in, which is really only for low > output devices. In amateur radio, a dynamic desk mic is a relatively low output device. Dynamic mics produce (very roughly) 20 dB less output voltage than capacitor mics, and desk mics are typically used further from the operator's mouth than other types. Use the extra gain and don't worry. It's perfectly normal. 73, Richard G4DYA __ 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] 6m off-frequency
On 11/06/17 22:41, Erik Basilier wrote: > I don't have any suggestions for a solution beyond what others have already > mentioned, but as a side note I would like to discuss the concept of "off > frequency". > > It seems to me that these days, on the HF bands that I frequent, more and > more people tune SSB to where the displayed frequency is on an 500 Hz > boundary, and their rigs have sufficient frequency accuracy that excellent > copyability results without any further adjustment. This approach is much > faster than tuning by listening for most natural voice, which for me takes a > few moments. [snip] > Now tuning SSB stations is a bit like tuning FM "channels". I am not > advocating > "channelizing" the HF bands, as we should have the freedom to select our > frequenciy according to the situation, but a lot of times, using a frequency > ending in zeroes saves time and effort. I agree with all of your post, including the bits I've snipped. These days the majority of SSB signals are not just on exact multiples of 500 Hz, but on multiples of 1 kHz too. I see this evolutionary development as a big improvement over the old analogue free-running LC VFO days, before digital readouts, when we could neither measure nor control our frequencies to better than about 500 Hz. We needed the RIT just to cope with drift! I am not advocating channelizing the HF bands either, as this would curtail our freedom to an extent that is difficult to justify. However, assuming a "channel" is 3 kHz wide, if we're working to multiples of 1 kHz, then we've already moved one third of the way to de-facto channelization without even realising it! Nowadays one the main sources of QRM is other stations exactly one or two kHz away from us. If as individuals we voluntarily choose frequencies that are exact multiples of 3 kHz, then we can help to reduce this problem. It both reduces QRM and makes for more efficient use of the spectrum. The only Elecraft-specific aspect of this relates to CONFIG:VFO CRS, where the available step sizes (for SSB) are 0.1, 0.5, 1.0 and 2.5 kHz. It would be nice if 3.0 kHz could be added to this list in a future firmware upgrade, and the selection made per-band as well as per-mode. 73, Richard G4DYA __ 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] KPA500 wattmeter calibration
I've been trying to calibrate the KPA500 wattmeter. I'm using a new Bird 43 meter with new 500A and 500H elements and a 1kW Bird Termaline load, connected by the shortest practical lengths of co-ax. Everything is fine, except on 50 MHz, where there isn't quite enough adjustment range available. At 500 Watts (as indicated on the Bird 43) and a PWR ADJ setting of 100, the KPA indicates just 325 Watts. Adjusting PWR ADJ from 100 to 120 (the maximum available) brings it up to 480 Watts. This is near enough, but is it a known problem that the range of adjustment isn't quite enough? 73, Richard G4DYA __ 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] [K3S] JT65-HF Beginner
On 27/05/17 21:37, Jim Brown wrote: > I've been using JT modes for about six years. You should ONLY use > WSJT-X, which is the software developed under the supervision of WSJT > inventor (and Nobel laureate) K1JT. All other versions are derived from > his earlier work, and most are unauthorized. His software is the best. I agree with all of that, except the 'unauthorized' bit. All the derivatives are authorized by K1JT's decision to release his source code under the GNU General Public License (GPL). His intention in doing so was presumably to attract developers to the project rather than facilitate a plethora of half-baked forks. These 'me too' knock-offs contain typically 99% source code from WSJT-X. They variously offer (1) a reduced subset of functionality, (2) 'deep decode' at the cost of more frequent erroneous decodes, (3) inappropriate use of VHF-only features on HF, and (4) balkanized on-air protocols with badly-thought-out and incompatible modifications. As Jim said, you should ONLY use WSJT-X. It is developed by a team of very clever people. It's also worth following wsjtgr...@yahoogroups.com - it's an excellent forum/list with frequent posts from the lead developers. 73, Richard G4DYA __ 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] GPS Disciplined 10MHZ source from China
On 08/05/17 23:26, Jay Miller wrote: > I was curious so I bought a GPS disciplined 10MHz source from China using > the eBay seller "cybereveryday." I have a calibrated scope and a Rubidium > 10MHz source. I noticed a frequency offset on three of the WWV frequencies > when I plugged it into the K3 XREF module after getting "GPS Lock" rather > than using my Rubidium lamp standard I measured the 10MHz output from the > GPSDO and it is 10,000,025 Hz. (2.5 PPM) The eBay ad states "Accuracy: than > above OXCO 2 order of magnitude." The point is, even using the K3 zero-beat > method with 15 MHz WWV I can get closer to being dead on frequency than > using this Chinese mfg. GPSDO. Again, Elecraft quality and engineering WINS. If you want a good quality 10 MHz GPSDO, I recommend the one made by Leo Bodnar M0XER. It was reviewed in QST, June 2016. https://leobodnar.com/ 73, Richard G4DYA __ 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] K3S SSB TX monitor - feature request
On 08/04/17 21:21, Joe Subich, W4TV wrote: > You are looking for a solution that is unique to your own situation > and would inconvenience hundreds of other users simply because you > are too lazy to program a PF/Macro to toggle CONFIG:SPKR+PH when > you use a headset. Which part of the word "option" do you not understand? 73, Richard G4DYA __ 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] Feature Request
On 08/04/17 18:58, Mike Harris wrote: > I'm losing track here. Am I correct in understanding: > > 1. SSB Sidetone required when wearing headphones. > > 2. SSB Sidetone not required when headphones are unplugged and listening > to speaker. > > 3. SSB Sidetone automatically zeroed upon unplugging headphones. > > 4. Headphones are just that, not a headset with mic, and are plugged > into the front panel socket otherwise plugging and unplugging would be > inconvenient. Yes. 73, Richard G4DYA __ 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] K3S SSB TX monitor - feature request
On 08/04/17 18:11, Joe Subich, W4TV wrote: > >> On 4/8/2017 2:24 AM, Richard Lamont wrote: >>> The firmware, however, does not appear to support what seems a simple >>> and common-sense requirement. > > It is *not* the firmware - it is the *hardware* that does not support > what you call a "simple and common-sense requirement" and what others > call stupidity. Perhaps you should study the schematic - at least of > the K3 which is published. Notice on the sheets K3 DSP: CODECS and K3 > DSP:DAC AUDIO the headphone/speaker amplifiers are fed *IN PARALLEL*. > LHPOUT/RHPOUT of U7 (the DC) goes through the audio lowpass filter to > U1 (speaker amplifier) and U2 (headphone amplifier) *IN PARALLEL*. > *THERE IS NO POSSIBLE WAY* to send monitor audio *to only* the > *headphone amplifier* (or for that matter *only* to the speaker). I studied the K3 schematics a few days ago. I've just studied them again. Thanks for the reminder. On receive, the rig is capable of muting the speakers when the headphones are plugged in. This is quite normal. This happens despite the two audio amplifiers having parallel inputs. There are switch contacts on the front panel headphone jack that enable the rig to 'know', firmware permitting, whether there's a jack plug in the socket. There is also a line labelled MUTE1 connected to the pin 2 of the speaker amplifier U1. So the hardware exists to enable the firmware (a) to know whether headphones are plugged in, and (b) to mute the speaker amplifier. This hardware is, AFAICS, used on receive. All I'm asking for as an option to do the same thing on transmit, if a particular set of circumstances is true: Is the rig on a voice mode? Is the audio input set to mic (not line in)? Is the rig transmitting? Is there nothing plugged into the front panel headphone socket? If these four conditions are all true, then mute the speaker amplifier. 73, Richard G4DYA __ 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] K3S SSB TX monitor - feature request
On 08/04/17 15:42, Rick WA6NHC wrote: > I'll make two comments and no insult is intended or implied; its an > opinion. > > Your 'need' to hear your own voice during transmit is not a common (to > my experience) requirement. There is often a slight phase shift and > it's distracting to most so they simply mute the receiver and are > satisfied with the silence. Whether or not there's a 'need' to hear your own voice in the headphones during transmit depends partly on the headphones. The better the isolation of ambient sound they provide, the greater the attenuation of the natural mouth-to-ear path. The two models of headphones I have both provide excellent isolation of ambient sound. That's partly why I bought them. (Originally for audio production work, not amateur radio.) (Sennheiser HD25 and Beyerdynamic DT100.) I find that so much isolation makes it difficult to speak. It feels as though I've suddenly gone deaf. The need to provide one's own voice in headphones, and keep it out of any speakers in the same room, was recognised by radio broadcasters decades ago. Pretty well every broadcast studio that's ever been built caters for it. I disagree that a 'slight phase shift' is distracting. A delay (of tens of milliseconds or more) is distracting. Elecraft caters for this with CONFIG:TXMON NOR or FAST. I use the latter and it sounds great. > If it is (as you've stated twice now) a 'common sense requirement' I > daresay that Elecraft would have already implemented it; they're > rather good at doing that. Perhaps it's simple to allow, that's an > unknown. However stridently insisting that any particular way is > common sense that is contrary to the majority belief is not the way > to endear oneself to those that are capable of creating a means to > have it your way. I'm not sure quite what your evidence is for any 'majority belief'. And if the need to keep microphone audio out of the speaker is not common sense ... then what is? Does not every engineer learn this at his mother's knee? My pointing this out is not a criticism of Elecraft. (If anything, Elecraft is ahead of the game by providing voice sidetone at all.) > There IS a work around and you're aware of it. The vinegar:honey > rule applies. Perfection is an illusion because it's perspective > based. I am aware of the workarounds. I am also aware why they don't work for me. You might not necessarily be aware of the latter, but thank you anyway. 73, Richard G4DYA __ 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] K3S SSB TX monitor - feature request
On 07/04/17 20:19, Phil, GJ4CBQ wrote: > It might be worth your while re-reading Richard's posts. > > What he is asking for is the **automatic** toggling of the monitor > function on insertion and removal of the headphone plug, without the use > of a macro. > > The CONFIG:SPRK+PH setting does not achieve this. And yes, I've been > using the PF2 key in the manner you describe for some years now. Thank you. At last, someone has actually read my post! When operating SSB, I like to listen on speakers. If I need to fish a weak one out of the crud, I'll grab the headphones and plug them into the front panel jack. At the end of that QSO, I'll unplug and go back to speakers. When I transmit, I need to hear my own voice as sidetone in the headphones, but not the speakers. I want the rig to do this *automatically* without button presses, knob twiddles, the use of different sockets or any external hardware. These are all obvious but unsatisfactory workarounds. The firmware, however, does not appear to support what seems a simple and common-sense requirement. 73, Richard G4DYA __ 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] K3S SSB TX monitor - feature request
On 07/04/17 06:59, Bob Wilson, N6TV wrote: > On Thu, Apr 6, 2017 at 1:53 PM, Richard Lamont <mailto:rich...@lamont.me.uk>> wrote: > > When I'm using a voice mode with a microphone, I need the TX monitor > audio to appear in the headphones and NOT the speakers. > > I need this to happen automatically, every time I plug in or unplug the > headphones, without having to do anything else. > > Is there any way of configuring the rig to do precisely this? > > It's a reasonable feature request, though I'm not aware of any other rig > that automatically turns the mic. monitor ON when you plug in > headphones, and automatically turns the mic. monitor OFF when you unplug > headphones and listen on a speaker. Of course this is something you > only want to do on phone. When operating CW, and maybe digital, you > always want the monitor ON, even when using speakers. Agreed 100%. When you plug headphones in, there's a delay of about a second before the speakers mute. This strongly suggests that the muting is controlled by software, not just by cutting the speaker analogue audio directly on the back contacts of the headphone jack. So presumably the rig's software 'knows' when headphones are plugged in. > I do not understand you want to listen to both headphones and speakers > at the same time, unless you have someone else in the shack who wants to > hear what's going on with no risk of feedback from the speakers. I don't wish to listen simultaneously on both headphones and speakers. That isn't the problem. I'm just trying to keep the TX mon audio (from the mic) in the headphones and out of the speakers, without having to use macros or fiddling with controls. (All my macro buttons are used up, and if I forgot to push the button I'd be either missing sidetone or getting feedback next time I transmit. And fiddling with controls wastes time in a contest or pileup.) I use 'enclosing' headphones (Sennheiser HD25, Beyer DT100) that mean I cannot hear my own voice well enough without some sidetone, and this makes speech more difficult. As there appears to be no way of doing this at the moment, I guess this is a firmware feature request. I'm not aware of any other rig that does what I'm asking for. Historically, however, rigs had a single audio power amplifier and relied on 'dumb' switching of the amplified audio using the back contact on the headphone jack to mute the speaker. I'm inferring from the one second delay mentioned above that the K3S hardware is capable of supporting a smarter approach, even if firmware doesn't, yet. 73, Richard G4DYA __ 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] K3S SSB TX monitor
Barry, Thank you. You've confirmed what I suspected: that the desired functionality doesn't exist. To prevent monitor audio from the microphone from reaching the speaker, while keeping it going to the headphones, and to do this without operator intervention, seems a simple enough requirement. Having to fiddle with the monitor level after plugging or unplugging headphones is a right pain. What I'm asking for seems such a no-brainer I can't believe it isn't standard. Why on earth would anyone want their live microphone audio routed to the speaker? It's a transceiver, not a public address system. 73, Richard G4DYA On 06/04/17 22:30, Barry Simpson wrote: > Richard > > I do not believe that the K3 can do what you want. The monitor is either > on or off independently of whether you are listening through the speaker > or headphones. > > If you mainly listen through the speaker, just turn the monitor to zero > and them turn it up when you wear headphones. > > I think that is the only way. > > 73 > > Barry VK2BJ > > On 7 April 2017 at 06:53, Richard Lamont <mailto:rich...@lamont.me.uk>> wrote: > > My previous post might not have made it clear what I'm trying to achieve > with the K3S. > > For RX audio, I usually listen on speakers. These mute when I plug the > headphones in. That's standard and obvious and just what I want. > > When I'm using a voice mode with a microphone, I need the TX monitor > audio to appear in the headphones and NOT the speakers. > > I need this to happen automatically, every time I plug in or unplug the > headphones, without having to do anything else. > > Is there any way of configuring the rig to do precisely this? > > 73, > Richard G4DYA > > > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > <http://mailman.qth.net/mailman/listinfo/elecraft> > Help: http://mailman.qth.net/mmfaq.htm > <http://mailman.qth.net/mmfaq.htm> > Post: mailto:Elecraft@mailman.qth.net <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 vk...@optusnet.com.au > <mailto:vk...@optusnet.com.au> > > -- Richard Lamont __ 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] K3S SSB TX monitor
My previous post might not have made it clear what I'm trying to achieve with the K3S. For RX audio, I usually listen on speakers. These mute when I plug the headphones in. That's standard and obvious and just what I want. When I'm using a voice mode with a microphone, I need the TX monitor audio to appear in the headphones and NOT the speakers. I need this to happen automatically, every time I plug in or unplug the headphones, without having to do anything else. Is there any way of configuring the rig to do precisely this? 73, Richard G4DYA __ 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] K3S SSB TX monitor
It would be useful when operating SSB to be able to hear my own voice in the headphones, but not on the speaker, where it can cause feedback. Is there any way of configuring the rig so that when using a voice mode with a microphone, the TX monitor feeds the headphones but not the speaker(s)? 73, Richard G4DYA __ 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] 90 ' of 1/2" Andrew Heliax FSJ4-50B and 2 F4PNM new in box connectors FOR SALE
On 26/01/17 22:48, Bill Johnson wrote: > I have 90' of Andrew Heliax with connectors, never mounted, brand new in > boxes. I am selling as I do not plan on using. Why are you posting this on the Elecraft list? It's nothing at all to do with Elecraft. How are people supposed to filter their information flow if people just splatter anything anywhere? 73, Richard G4DYA __ 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] Volumn from K3S USB interface
On 10/01/17 00:48, Bill Frantz wrote: > I have installed the KIO3BUPKT in my K3 and am generally quite satisfied > with it. During the weekend RTTY contest, I noticed that I was getting > very low audio volumes coming into my MacIntosh when the AGC was engaged > (both in fast and slow modes). I tried to find how to adjust the volume > in the K3S manual, but only found the procedure by reading all the > CONFIG items in the back of the manual. The LIN OUT setting does the job. > > The manual warns that values higher than 10 may result in overdrive of > the soundcard or saturation of the KIO3’s isolation transformers. I > found a setting of 40 seemed to work well. > > Am I the only one driving the USB this hard? No. I did some measurements and posted to this list on Nov 6, 2016. With AGC on, and LIN OUT set to default (10), the digital level via the USB interface was -22 dBFS (true peak). With LIN OUT set to 40, the gain is increased by 12 dB and thus peaks to -10 dBFS on the USB interface. This is a much more sensible level. I don't know if this is saturating the transformers, but as I don't use the analogue line output it doesn't matter in my case. I don't understand why the gain structure of the rig is designed so that have to have the output either too low on USB or so high it risks saturating the transformers on analogue. When operating WSJT-X, I leave LIN OUT at 10, turn AGC off and adjust the RF gain to get the level I want. 73, Richard G4DYA __ 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] Reported RX Frequncies in WSJT-X?
On 23/11/16 11:16, MaverickNH wrote: > Looking at WSJT-X 1.7rc2 ALL_WSPR log and seeing RX frequencies such as > 14.0971282. Seems like too many digits unless reporting 10th of a Hertz as > in 14,097,128.2 Hz. Perhaps this is calculated as an average over the RX > window? > > Looking at the log for RX over 500+ RXs, I find the RX frequency range is > 206Hz. Actual TX 14,097,037 and average RX at 14,097,110, or +73Hz. > > I have a GPSDO managed PC clock as well as a GPSDO managed frequency > oscillator in my K3S transceiver, so my regulation is pretty tight. > > What are the major components of the deviation in reported RX frequency? I > posted on WSPRnet also, but one seldom gets replies there on any posts. There are errors at the TX end, errors at the RX end and errors in the middle: ionospheric doppler shift. With a K3S + GPSDO, the biggest source of RX error might be the tolerance of the sampling frequency of the sound card. The built-in USB sound card has a 100ppm clock crystal, corresponding to ±0.15 Hz @ 1500 Hz. -- Richard G4DYA __ 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] KX3 Transmit EQ Settings
On 09/11/16 21:28, k4mmg@gmail.com wrote: > Any suggestions on what EQ settings for good SSB communication using the > Elecraft hand mic? > > Any suggestions on what EQ settings for good SSB communications using any > other type of mike? Good intelligibility seems to coincide with having roughly equal power per unit bandwidth. So look at the waterfall on a convenient WebSDR and see where the peaks and troughs in your signal are, then tweak accordingly. There's little point in having anything below 300 Hz unless you wish to be mistaken for Barry White. -- Richard Lamont G4DYA __ 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] K3S USB audio questions
Hi, FWIW I've done this. I've increased the gain by 12 dB, i.e. two bits. Incidentally, the scaling on CONFIG:LIN OUT is linear - i.e. the output voltage is proportional to the number. So for +12 dB w.r.t. the default I've increased it from 10 to 40. Richard Lamont G4DYA On 06/11/16 16:48, ab2tc wrote: > Hi, > > You make a good point for some digital modes. But you should be able to make > up for most or all of these 3 bits by increasing the LINE OUT as it must > surely be before the codec ADC but probably not before the K3's DSP DAC. > It's a shame that they have to do it this way (back to back DAC/ADC, but > everybody else is doing the same). But by adjusting LINE OUT, the USB audio > interface should be no worse than the audio LINE OUT considering the > nonlinearity of the transformer in that path. > > AB2TC - Knut > > > > Richard Lamont wrote >> On 05/11/16 18:13, ab2tc wrote: >> [ >>>>> 4. When listening to SSB audio at S9+, with slow AGC, the output level >>>>> via this interface seems to be -22 dBFS true peak. Why is it throwing >>>>> away three bits of resolution? Or is this amount of headroom >>>>> necessary/useful? >> >>> The audio level seen by, say a recording program on the PC depends on the >>> LINE OUT setting on the K3. I left that as the default, 10, and used the >>> Windows mixer to adjust the level. My audio is now reading approximately >>> -6dB below clipping which is probably a little high, but I have set my >>> AGC >>> SLP to the flattest possible setting (highest number). If you prefer a >>> considerable slope on the AGC curve above threshold, you will need a >>> lower >>> LINE OUT setting. Remember that even when throwing away 3 bits, you still >>> have far more resolution than you can use with an HF receiver. >> >> Consider JT65+JT9. There might be 30 or more signals within a 4 kHz >> band, with widely varying levels. If they're all at the same level, then >> each signal will be about 30 dB below the sum of the signals. If the >> signal you want is 30 dB weaker than the others, then it will be 60 dB >> below the sum. >> >> The data sheet shows the ADC has an SNR of 89 dB and THD+N of 0.01% >> (i.e. -80 dB). >> >> If the sum of the signals is peaking to -22 dBFS true peak, than that >> weak JT65/JT9 signal is going to be at -82 dBFS - close to the ADC noise >> floor. Maybe getting at least some of those three bits back could make >> quite a difference. >> >> >> -- >> Richard Lamont G4DYA >> < > >> richard@.me > >> > >> > > > > > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/K3S-USB-audio-questions-tp7623845p7623862.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 > Message delivered to rich...@lamont.me.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3S USB audio questions
On 05/11/16 18:13, ab2tc wrote: [ >>> 4. When listening to SSB audio at S9+, with slow AGC, the output level >>> via this interface seems to be -22 dBFS true peak. Why is it throwing >>> away three bits of resolution? Or is this amount of headroom >>> necessary/useful? > The audio level seen by, say a recording program on the PC depends on the > LINE OUT setting on the K3. I left that as the default, 10, and used the > Windows mixer to adjust the level. My audio is now reading approximately > -6dB below clipping which is probably a little high, but I have set my AGC > SLP to the flattest possible setting (highest number). If you prefer a > considerable slope on the AGC curve above threshold, you will need a lower > LINE OUT setting. Remember that even when throwing away 3 bits, you still > have far more resolution than you can use with an HF receiver. Consider JT65+JT9. There might be 30 or more signals within a 4 kHz band, with widely varying levels. If they're all at the same level, then each signal will be about 30 dB below the sum of the signals. If the signal you want is 30 dB weaker than the others, then it will be 60 dB below the sum. The data sheet shows the ADC has an SNR of 89 dB and THD+N of 0.01% (i.e. -80 dB). If the sum of the signals is peaking to -22 dBFS true peak, than that weak JT65/JT9 signal is going to be at -82 dBFS - close to the ADC noise floor. Maybe getting at least some of those three bits back could make quite a difference. -- Richard Lamont G4DYA __ 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] K3S USB audio questions
A few questions about the K3S internal audio interface: 1. Is the internal connection between the USB audio interface and the 2nd IF analogue or digital? If digital, how is the sample rate conversion implemented? 2. It seems to support sampling rates of 32000, 44100 and 48000 Hz, but not higher or lower values. Is this correct? 3. What determines the clock frequency for this sampling? Is it a free-running crystal? If so, what is its frequency tolerance? Or is it locked to the main TXCO and/or external 10 MHz reference? 4. When listening to SSB audio at S9+, with slow AGC, the output level via this interface seems to be -22 dBFS true peak. Why is it throwing away three bits of resolution? Or is this amount of headroom necessary/useful? TIA. -- Richard Lamont G4DYA __ 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] Microphone
On 13/10/16 20:40, Arie Kleingeld PA3A wrote: > As far as mic-audio is concerned: how much hi-fi can you put through a > 2.5kHz bandwidth SSB signal? Not much. But there's more to microphone quality than frequency response. 1. Plosives. Will the mic handle poppy 'p' sounds without overloading? 2. Directionality. Is it directional? If not, you'll get more shack reverberation, fan noise and reflections from the desk (causing comb filter notches in the response). 3. Proximity effect. Will the mic increase LF as you get closer to it? If it's directional, yes it will, unless it's one of the Electro-Voice Variable-D types or similar. Omnis don't have proximity effect. 4. Handling noise. If hand-held, how much unwanted noise is generated as you move around? 5. Screening. Is it adequately screened? If not, it may be more prone to RF feedback. 73, Richard G4DYA __ 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
