Re: [Elecraft] K3 Filter Ring with Noise?
On Sun, 9 Aug 2009 15:21:21 -0700, Ron D'Eau Claire wrote: I'm not expert on human hearing, but I suspect we can discriminate tones (and hear tones in noise) much better than we can discriminate subtle changes in amplitude YES! And there are also several ways in which humans can hear VERY small differences in arrival times of the same acoustic signal coming from two directions. One of those ways is selective fading, which is primarily the cancellation between two signals arriving via different paths that are slightly different in length. The repetition rate of fading is inversely proportional to wavelength, so is quite long on 160M (slow QSB) and quite short on 2M (picket-fencing). Another way is when the same electrical signal is fed in phase and in polarity to two loudspeakers that are at different points in space. If you use broadband noise as the test signal and walk a straight line parallel to a pair of speakers about ten feet apart (that is, with one ear facing them) about six-ten feet in front of them, you will hear coherent addition at the point where you are precisely on centerline, and a strange sort of phasy distortion that Lou Burroughs called acoustic phase cancellation and modern sound engineers call comb filtering. If with the same setup you FACE the loudspeakers and crab walk side to side between them, you will hear the image be dead center in front of you on centerline, and quickly shift to the closest loudspeaker as you move only a few inches off centerline. A difference in travel time on the order of a few tens of microseconds can be clearly heard as an image shift. 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
Re: [Elecraft] Problem with 100W PA
I think I tracked the problem to a bad powerpole connection at the power supply. Anyway, It is working now. Sorry Ed I was just about to give it to you:-) Dave N1IX - Original Message - From: N1IX n...@n1ix.com To: elecraft@mailman.qth.net Sent: Sunday, August 09, 2009 8:06 AM Subject: [Elecraft] Problem with 100W PA I noticed that my power output would not go above 80 watts on the display so I finally decided run the Calibrate Transmitter Gain selection in the K3 utility program. The 5 watt calibration runs fine with no problem. When I run the 50 watt calibration I get a number of errors. The first is CheckSwr: Unexpected response to DS; State 151. Which is followed by a number of error messages. Now the K3 trips off whenever I try to use more than 40 watts. I have tried everything that I can think of. Both antenna connectors Two different dummy loads. Different cables both RS232 and Coax. Powercycle the K3. Even rebooting the computer. Has anyone else experienced this? Any suggestions? Dave N1IX __ 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] WTT FOR K2
I have made a trade, TNX for all that did reply. Kurt - K0ARO __ 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] K3: Band edge beep?
I had a chance to play with my new K3 over the weekend. The one little feature that I have enjoyed with many other rigs is a band edge beep from the rig. Does the K3 have something like this, and I just missed it while learning the rig? 73 Jim WB8AZP __ 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] K3: Band edge beep?
In a recent message, Jim Kvochick k...@att.net wrote ... The one little feature that I have enjoyed with many other rigs is a band edge beep from the rig. Does the K3 have something like this, and I just missed it while learning the rig? This would need to be user-programmable, Jim, due to different parts of the world having different bands. For example, 40m in the UK is 7.0-7.2MHz and here we have seven mini-bands on 60m that can be used on various modes including CW. I feel that while your suggestion has its points it could make the K3 unnecessarily complicated. 73 -- David G4DMP Leeds, England, 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] K3: Band edge beep?
Jim Kvochick wrote: I had a chance to play with my new K3 over the weekend. The one little feature that I have enjoyed with many other rigs is a band edge beep from the rig. Does the K3 have something like this, and I just missed it while learning the rig? Band edges very between countries; but I've always wondered why rigs don't have user-programmable beeps for use as *personal* reminders about band plans, beacon frequencies to avoid etc. All it needs is a simple beep when tuning through a programmed frequency, just to jog the user's memory. Not everyone would find it useful. Even I might not, in normal waking hours; but the pre-dawn zombie who sometimes appears in this shack could use a little help. -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek __ 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] ERR TXG
VE2SHF sed: One think worth mentioning: I had to apply significant pressure on the three transistors mounted on LPA board when I installed the lower bottom panel because the transistors raised slightly above the bottom panel level. I don't know if it is normal (ensure good thermal contact?) or if I used the wrong screws somewhere. When I assembled my K3, merely having the bottom panel too close to the band stop circuit board was enough to cause me repeated ERR TXG messages, particularly when the weight of the 100W module pushed the board closer to the bottom panel. The band stop board is about the size of a postage stamp, hanging down from the bottom of the main RF board. But in your case, you have already noticed a bigger mechanical problem than I had. I suggest that you contact K3 Support at k3supp...@elecraft.com and describe the mechanical problem you noticed, as above. Your need to force on the bottom panel may well be the cause of the ERR TXG. 73, Paul W8TM __ 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] K3: Band edge beep?
--- On Mon, 8/10/09, Ian White GM3SEK gm3...@ifwtech.co.uk wrote: From: Ian White GM3SEK gm3...@ifwtech.co.uk Subject: Re: [Elecraft] K3: Band edge beep? To: elecraft@mailman.qth.net Date: Monday, August 10, 2009, 6:25 AM Jim Kvochick wrote: I had a chance to play with my new K3 over the weekend. The one little feature that I have enjoyed with many other rigs is a band edge beep from the rig. Does the K3 have something like this, and I just missed it while learning the rig? Band edges very between countries; but I've always wondered why rigs don't have user-programmable beeps for use as *personal* reminders about band plans, beacon frequencies to avoid etc. All it needs is a simple beep when tuning through a programmed frequency, just to jog the user's memory. Not everyone would find it useful. Even I might not, in normal waking hours; but the pre-dawn zombie who sometimes appears in this shack could use a little help. My 11 year old Kenwood TS-870 has a feature that allows programming of automatic mode boundaries. Properly set for example, when I tune down from 14.2 MHz where the rig is in USB, crossing 14.15 puts it into CW. __ 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] K3: Band edge beep?
Hi, It will be next option in K3 utility or K3 EZ manager by N2BC , I think! 73, de E72X --- On Mon, 8/10/09, Wes Stewart n...@yahoo.com wrote: From: Wes Stewart n...@yahoo.com Subject: Re: [Elecraft] K3: Band edge beep? To: elecraft@mailman.qth.net, Ian White GM3SEK gm3...@ifwtech.co.uk Date: Monday, August 10, 2009, 4:43 PM --- On Mon, 8/10/09, Ian White GM3SEK gm3...@ifwtech.co.uk wrote: From: Ian White GM3SEK gm3...@ifwtech.co.uk Subject: Re: [Elecraft] K3: Band edge beep? To: elecraft@mailman.qth.net Date: Monday, August 10, 2009, 6:25 AM Jim Kvochick wrote: I had a chance to play with my new K3 over the weekend. The one little feature that I have enjoyed with many other rigs is a band edge beep from the rig. Does the K3 have something like this, and I just missed it while learning the rig? Band edges very between countries; but I've always wondered why rigs don't have user-programmable beeps for use as *personal* reminders about band plans, beacon frequencies to avoid etc. All it needs is a simple beep when tuning through a programmed frequency, just to jog the user's memory. Not everyone would find it useful. Even I might not, in normal waking hours; but the pre-dawn zombie who sometimes appears in this shack could use a little help. My 11 year old Kenwood TS-870 has a feature that allows programming of automatic mode boundaries. Properly set for example, when I tune down from 14.2 MHz where the rig is in USB, crossing 14.15 puts it into CW. __ 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] PSK-D Mode
I made a few PSK31 QSO's today sending in DATA-A mode. However, I like the apparent benefit to PSK-D mode where there is no need to watch ALC levels. I use FSK-D for RTTY which works very well with no need to watch audio levels. In PSK-D, I can Key and send PSK. In the monitor I hear what sounds like PSK being sent and the wattmeter shows full quivering power out. However, no one responds to me. I did a test with one station switching back and forth between Data-A and PSK-D to prove the point. I don't know were the signal is going in PSK-D. It's apparently not on my receive frequency or its not PSK31. Firmware is 3.19 and software is DX4WIN using its PSK31 window. Maybe I don't understand the purpose of PSK-D. 73, Bud W3LL w...@arrl.net __ 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] PSK-D Mode
Bud, PSK-D mode is only available for operating PSK directly from your CW paddles connected to the paddle input. or Using the terminal pane on the K3 Utility program. There is no provision for PSK-D keying from soundcard programs. If using a soundcard/computer, use Data-A. If you are out in the field and/or no computer is available, use PSK-D with your paddles. - 73, Greg - AB7R Whidbey Island WA NA-065 On Mon Aug 10 7:12 , Bud Governale, W3LL sent: I made a few PSK31 QSO's today sending in DATA-A mode. However, I like the apparent benefit to PSK-D mode where there is no need to watch ALC levels. I use FSK-D for RTTY which works very well with no need to watch audio levels. In PSK-D, I can Key and send PSK. In the monitor I hear what sounds like PSK being sent and the wattmeter shows full quivering power out. However, no one responds to me. I did a test with one station switching back and forth between Data-A and PSK-D to prove the point. I don't know were the signal is going in PSK-D. It's apparently not on my receive frequency or its not PSK31. Firmware is 3.19 and software is DX4WIN using its PSK31 window. Maybe I don't understand the purpose of PSK-D. 73, Bud W3LL w...@arrl.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: Elecraft@mailman.qth.net','','','')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] PSK-D Mode
Bud Your last comment about using DX4WIN makes me think you're trying to use software to send PSK while in D mode. D mode is strictly for using a key paddle and the K3's internal decoder. You were probably just sending a constant idle signal and pounding away on the computer's keyboard. Steve N4LQ n...@carolina.rr.com - Original Message - From: Bud Governale, W3LL w...@arrl.net To: elecraft@mailman.qth.net Sent: Monday, August 10, 2009 10:12 AM Subject: [Elecraft] PSK-D Mode I made a few PSK31 QSO's today sending in DATA-A mode. However, I like the apparent benefit to PSK-D mode where there is no need to watch ALC levels. I use FSK-D for RTTY which works very well with no need to watch audio levels. In PSK-D, I can Key and send PSK. In the monitor I hear what sounds like PSK being sent and the wattmeter shows full quivering power out. However, no one responds to me. I did a test with one station switching back and forth between Data-A and PSK-D to prove the point. I don't know were the signal is going in PSK-D. It's apparently not on my receive frequency or its not PSK31. Firmware is 3.19 and software is DX4WIN using its PSK31 window. Maybe I don't understand the purpose of PSK-D. 73, Bud W3LL w...@arrl.net __ 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] Subject: Another Better Mouse-trap?
This idea was put forth by Don-W6JL (Fallbrook, CA)!!! His quote: I have tested many noise blankers in modern rigs, on the air. Both the I.F. noise gates and the DSP-based noise reducers. Not one works the way I feel it should. I think you need a separate noise receiver, independent of the main receiver, and tuned to a frequency that is outside of a ham band. (There have been excellent homebrew receivers using this approach for noise blanking). This then drives the noise gate, and is timed so that it gates the I.F before the noise pulse arrives there. A good blanker should have 40 dB minimum of noise pulse suppression, with adjustable blanking level and widths. I notice the K3 has these features, but it still does not seem to reduce impulse noise more than an S unit or two (6-12 dB), which is inadequate. I do not use blankers here myself; my entire station is homebrew and the receiver is a phasing, image cancelling job with no blanking at all, (or AGC for that matter). I get along fine with neither, even in contests. ** Eric-WA6HHQ Co. + All the loyal K3ers WHADDAHYA THINK??? Jim/nn6ee __ 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] K3 Filter Gain question.
Thanks Bill, On 9 Aug 2009, at 13:10, Bill W4ZV wrote: Regarding gain, although the actual insertion loss for 500 Hz filters is more than 1-2 dB, but I would follow Elecraft's recommendation. I previously set mine to the actual loss (5-6 dB) but have since backed off to 0 dB after reading some comments by Lyle and Wayne (which cautioned about other problems induced by gain being too high). Yeah, that was the post I recevied. Regarding the warbling sound you're hearing in diversity, it's because your filters are set to different offsets. In your case you should set both 500s to -0.74 and both 2.7ks to the same (either -0.76 or -0.77). Ok, I assume though that this will make the (moved) filters slightly asymmetric then in the passband. Also I found this post from Wayne that says it's ok :) http://www.mail-archive.com/elecraft@mailman.qth.net/msg71951.html Thanks John __ 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] K3 Filter Gain question.
John Ronan wrote: Regarding the warbling sound you're hearing in diversity, it's because your filters are set to different offsets. In your case you should set both 500s to -0.74 and both 2.7ks to the same (either -0.76 or -0.77). Ok, I assume though that this will make the (moved) filters slightly asymmetric then in the passband. Also I found this post from Wayne that says it's ok :) http://www.mail-archive.com/elecraft@mailman.qth.net/msg71951.html You'll never notice the difference in shifting your 500s by + and - 10 Hz (i.e. both to -0.74) since 10 Hz is only 2% of total bandwidth. However both offsets should be identical to avoid the warbling sound you're hearing in diversity. Of course the 2.7k is even less sensitive to a 10 Hz shift since it's a much wider BW. Thanks for locating that post by Wayne (which W7TEA had asked about). 73, Bill -- View this message in context: http://n2.nabble.com/K3-Filter-Gain-question.-tp3412316p3417884.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] IF noise blanking trivia
The initial patent for the concept of a separate noise receiver detecting noise and blanking the IF system was issued to Motorola for use in their low band ... 27 - 54 mHz ... 2-way radios. They called it a range extender, and this was the label on the control heads that turned the feature on and off. 73! Ken Kopp - K0PP elecraftcov...@rfwave.net __ 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] K3: Band edge beep?
Seems to me that band edge beeps would be fairly easy to implement. The K3 will not transmit out of band so it knows where band edges are already, just add a beep when you cross the edge and a software switch to turn the feature off, if you don't want it. User programmable beeps could also be implemented using the K3 utility. Frank - W4NHJ - Original Message - From: Ian White GM3SEK gm3...@ifwtech.co.uk To: elecraft@mailman.qth.net Sent: Monday, August 10, 2009 8:25 AM Subject: Re: [Elecraft] K3: Band edge beep? Jim Kvochick wrote: I had a chance to play with my new K3 over the weekend. The one little feature that I have enjoyed with many other rigs is a band edge beep from the rig. Does the K3 have something like this, and I just missed it while learning the rig? Band edges very between countries; but I've always wondered why rigs don't have user-programmable beeps for use as *personal* reminders about band plans, beacon frequencies to avoid etc. All it needs is a simple beep when tuning through a programmed frequency, just to jog the user's memory. Not everyone would find it useful. Even I might not, in normal waking hours; but the pre-dawn zombie who sometimes appears in this shack could use a little help. -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek __ 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] IF noise blanking trivia
In addition to Motorola, didn't Collins use this approach with the KWM-2? I recall the noise receiver as operating around 40 MHz, which is a peak frequency for spark plug noise. Jack K8ZOA Ken Kopp wrote: The initial patent for the concept of a separate noise receiver detecting noise and blanking the IF system was issued to Motorola for use in their low band ... 27 - 54 mHz ... 2-way radios. They called it a range extender, and this was the label on the control heads that turned the feature on and off. 73! Ken Kopp - K0PP elecraftcov...@rfwave.net __ 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] K3: Band edge beep?
In a recent message, Frank Ross W4NHJ w4...@comcast.net writes Seems to me that band edge beeps would be fairly easy to implement. The K3 will not transmit out of band But is does, Frank. My K3 will transmit merrily between 7.2 and 7.3MHz, but I am not licensed to operate there. 73 -- David G4DMP Leeds, England, 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] Another Better Mouse Trap (noise blanker)
I have a TRF 40 MHz noise receiver about 500 KHz wide that generates blanking pulses. The idea was stolen from the Collins which had an accessory blanking receiver for the KWM2. In my case it blanked by momentarily interrupting the LO to the first mixer of the receiver, providing essentially infinite attenuation of the noise pulse. No separate noise gate. It is very effective, essentially removing any impulse thatis big enough to produce a blanking pulse. However it requires a separate noise-pickup antenna (I used a cut down CB whip) and is a bit more hardware. You never get something for nothing and blanking isn't free. For those who like to think in engineering terms, think of this act of momentarily blanking noise as modulation: we're digitally modulating the incoming spectrum of signals, multiplying by 1 to pass signals and 0 to blank signals them. Multiplying = modulation. A noise blanker modulates ALL the incoming signals and some of the sidebands produced by the blanking (modulation) process fall into the i.f. filter. So although the noise is blanked, there is a bit of crud introduced. I have a nearby cogeneration plant that generates electricity from a little river that's sold to the power company. At one point there was a transformer failure impending (dielecric breakdown) that produced s narrow 1 microsecond pulse of very high amplitude at a 120 Hz rate. The pulses, radiated by their power line, were so large I could see them on an oscilloscope connected to the dipole. I had steady S9+20 dB noise on 40m. The noise blanker took them down to S4. It was close to magic although not quite as good as my normal S3 noise level. But I tuned around the band and realized then that the rise in noise level was from off-frequency stations being smeared, or spread around, by the 120 Hz blanking pulses. Bill - W7AAZ __ 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] Subject: Another Better Mouse-trap?
Hi All, I've had many QSO's with Don, W6JL, on 40 CW. He hangs out there nearly every morning. His station is ALL homebrew, a fact he will beat you to death with everytime you talk to him. In fact, much of his station lays across his desk in sections, rather than neatly packaged in a case. But he is an inveterate builder and tinkerer, and I think he knows a lot! I guess having his station in pieces like that makes it easier for him to make changes and experiment. Don's comments that you quoted don't surprise me at all. He doesn't think much of commercial gear, and insists that rolling your own isn't difficult. For him maybe, but not necessarily for everyone. Nevertheless, his comments about noise blankers do make a lot of sense. And I bet he has investigated a bunch of them. What he describes as a better system seems to closely related to noise cancelling devices like the JPS NIR-10, and others. But I'm sure Don has a somewhat different approach in mind--he does mention using a receiver, rather than an accessory. I would bet money that Don's suggestion is a good one. It won't be as easy as he will make it sound, but it would probably not be terribly hard either. If you talk to Don, he would also probably be happy to tell you just how you could do it, and probably where you could info to build what you need. He has a great command of what you can find on the internet. In his words, you can find just about anything you need on the internet. The only caveat is that he will probably want you to build it, rather than buy it. It's a shame Don doesn't publish some of the stuff he like to talk about. Maybe he has, and I just missed it. Dave W7AQK - Original Message - From: JIM DAVIS nn...@astound.net To: elecraft@mailman.qth.net Sent: Friday, August 07, 2009 1:42 PM Subject: [Elecraft] Subject: Another Better Mouse-trap? This idea was put forth by Don-W6JL (Fallbrook, CA)!!! His quote: I have tested many noise blankers in modern rigs, on the air. Both the I.F. noise gates and the DSP-based noise reducers. Not one works the way I feel it should. I think you need a separate noise receiver, independent of the main receiver, and tuned to a frequency that is outside of a ham band. (There have been excellent homebrew receivers using this approach for noise blanking). This then drives the noise gate, and is timed so that it gates the I.F before the noise pulse arrives there. A good blanker should have 40 dB minimum of noise pulse suppression, with adjustable blanking level and widths. I notice the K3 has these features, but it still does not seem to reduce impulse noise more than an S unit or two (6-12 dB), which is inadequate. I do not use blankers here myself; my entire station is homebrew and the receiver is a phasing, image cancelling job with no blanking at all, (or AGC for that matter). I get along fine with neither, even in contests. ** Eric-WA6HHQ Co. + All the loyal K3ers WHADDAHYA THINK??? Jim/nn6ee __ 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] Subject: Another Better Mouse-trap?
Note that the writer, in calling for better noise blankers, says he doesn't need noise blankers! Still, they are useful at certain times and the Elecraft blankers do a very good job for me, making high-impulse repetitive noise virtually disappear. Examples of such noises are the buzz from cheap lamp dimmers on the lower bands to the pop-pop of a spark ignition system in an internal combustion engine on the higher bands. I don't hear many ignition systems these days, but I do have a cheap lamp dimmer issue on 160 and 80 meters. The Elecraft blankers take a S9+++ dimmer roar down below S-2. But all blankers have serious problems, too, so careful operators turn them off unless they're really needed. The weakness in blankers is that punching holes in the signal causes mixing products. Indeed all mixers work pretty much that way, using a strong signal to interrupt a second, often weaker, signal. The more aggressively you interrupt (punch holes) in one signal with another to blank out noise pulses, the more mixing products you create. If you really go at it to punch a hole for every blip of noise that arrives, the mixer will create even more noise than it's suppressing. In addition to wide-band hash caused by punching holes in the noise, interrupting the signal itself will create IMD products in the bandpass. Two receivers aren't needed for this nowadays although they were often used years ago. Nowadays it's rather easy to delay the signal slightly to give the logic system time to identify a qualifying noise pulse and interrupt the signal path at just the right time to punch a hole in it, suppressing the spike of noise. There are also techniques in which noise is received on a separate frequency, inverted and added to the main signal path. The idea is that they add - one positive and its counterpart negative - and, hopefully, cancel the noise, leaving the signal unaffected. That presumes noise can be found that is identical to the noise in the signal bandpass. I've read of various techniques, but the weakness seems to be that the noise is modified by the receiver (filters make noise impulses wider, frequency differences mean the noise may have different phase characteristics, etc.) so that the two noise signals aren't identical and so do not really cancel. One approach to that problem is to have two antennas on the same receiver on the same frequency, trying to arrange one antenna to receive little signal but receive the noise while the other is arranged to receive the signal was well as possible. The signals are then added right at the receiver input. I've not worked with that sort of noise suppressor. There have been many articles published over the years reporting that in some situations useful reductions can be had, but it usually involves lots of tedious and careful adjustments that must be reset whenever the receiver frequency changes. AFAIK, DSP-oriented noise reducers do not blank noise, but try to emulate the human brain to discriminate between a coherent signal (tone or speech) and noise. Like computers in general, they are truly in a very early stage of development compared to what the human brain can do with practice, especially on CW. They are pretty good on SSB, making several dB improvement in the desired signal-to-noise level in most cases, but distorting the voice in the process. Overall, I've not heard a DSP noise reducer that was as nice sounding, adaptable or as effective as my gray matter. Don makes a good point about AGC. Since AGC tries to maintain a constant audio level which makes the noise sound worse than it really is by cranking up the receiver gain automatically when the signal is not present. That's what AGC is supposed to do. Turning the AGC off leaves the band sounding like it really is without the noise being raised artificially to the signal level whenever the signal is not present. AGC systems typically offer some delay so the gain doesn't jump instantly, but that's only a partial solution. That's why all good receivers (including the Elecraft K3, K2, etc.) have a way to turn the AGC off. Even easier on the Elecraft rigs is to simply control the audio level with the RF Gain control instead of the Audio Gain control. Having the RF gain backed down limits the AGC action. (That doesn't work on receivers with a true RF Gain control adjusting the signal at the input. Elecraft receivers, like many modern receivers, actually control the I.F. gain with the RF Gain control.) AGC was invented back in the 1920's for use on AM broadcast radios for the general public to make them more user friendly when tuning across stations with widely varying strengths and to level out most QSB. It's useful on Ham receivers in the same way when casually tuning across the band if we don't mind the racket of the band noise between stations, but many of us never use AGC for serious operating. Instead we adjust the RF Gain as needed as we tune across the band. That alone gets rid of a
Re: [Elecraft] Subject: Another Better Mouse-trap?
The problem with a second receiver tuned (significantly, like Collins) out of band is that the noise isn't always the same at the two frequencies. IMHO, the problem with most blankers, as mentioned below, is that the designers don't introduce any delay in the signal path. It takes some time to amplify, detect and form the blanking pulses that drive the noise gate. Absent delay, the noise pulses get through the gate and do their mischief before the blanking takes place. See: http://k6mhe.com/n7ws/Noise_Blanker.pdf Wes N7WS --- On Fri, 8/7/09, JIM DAVIS nn...@astound.net wrote: From: JIM DAVIS nn...@astound.net Subject: [Elecraft] Subject: Another Better Mouse-trap? To: elecraft@mailman.qth.net Date: Friday, August 7, 2009, 2:42 PM This idea was put forth by Don-W6JL (Fallbrook, CA)!!! His quote: I have tested many noise blankers in modern rigs, on the air. Both the I.F. noise gates and the DSP-based “noise reducers”. Not one works the way I feel it should. I think you need a separate noise receiver, independent of the main receiver, and tuned to a frequency that is outside of a ham band. (There have been excellent homebrew receivers using this approach for noise blanking). This then drives the noise gate, and is timed so that it gates the I.F before the noise pulse arrives there. A good blanker should have 40 dB minimum of noise pulse suppression, with adjustable blanking level and widths. I notice the K3 has these features, but it still does not seem to reduce impulse noise more than an S unit or two (6-12 dB), which is inadequate. I do not use blankers here myself; my entire station is homebrew and the receiver is a phasing, image cancelling job with no blanking at all, (or AGC for that matter). I get along fine with neither, even in contests. __ 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] K3 Filter Ring with Noise?
On Sat, 08 Aug 2009 22:35:42 -0700, ~Brett wrote: One thing to try is to turn the bandwidth down to around 200Hz and find a quiet spot on the band then adjust your pitch up and down and listen to the band noise in a few places to see what you prefer based on the noise rather than the pitch. Then see if you can live w/ that pitch. Yes, but that is very tedious. Much better would be the ability to adjust the pitch of signals while you are listening to them. Unfortunately, when PITCH is on, received signal audio is blocked, even if you set the pitch volume to zero. It would be very nice to be able to interactively adjust a CW signal's pitch for optimum copy under current conditions of QRM and QRN, without detuning the VFO or RIT. 73, Drew AF2Z __ 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] Another Better Mouse-trap?
IMHO, the problem with most blankers, as mentioned below, is that the designers don't introduce any delay in the signal path. It takes some time to amplify, detect and form the blanking pulses that drive the noise gate. Absent delay, the noise pulses get through the gate and do their mischief before the blanking takes place. That's right: the blanking pulse needs to open the gate before the signal+noise pulse gets there. You can either delay the signal, or you make the blanking pulse so quick that it naturally arrives there before the signal. A wideband noise receiver can have less delay than the receiver, and blanking pulses can be generated in nanoseconds with todays fast circuits, so it can sometimes be done without a delay in the signal path. W7AAZ __ 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] Another Better Mouse-trap?
A noise gate placed in the signal path can be a source of IMD products, even when it is not active. IMHO a separate noise receiver which can be tuned over a limited frequency range above the band in use to avoid real signals, whose output inhibits LO drive when noise is present, plus the required delay in the signal path, is a useful recipe for a noise blanker. 73, Geoff GM4ESD __ 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] Another Better Mouse-trap?
We do add the needed delay as needed on the K2 and K3. 73, Eric WA6HHQ Elecraft === William Carver wrote: IMHO, the problem with most blankers, as mentioned below, is that the designers don't introduce any delay in the signal path. It takes some time to amplify, detect and form the blanking pulses that drive the noise gate. Absent delay, the noise pulses get through the gate and do their mischief before the blanking takes place. That's right: the blanking pulse needs to open the gate before the signal+noise pulse gets there. You can either delay the signal, or you make the blanking pulse so quick that it naturally arrives there before the signal. A wideband noise receiver can have less delay than the receiver, and blanking pulses can be generated in nanoseconds with todays fast circuits, so it can sometimes be done without a delay in the signal path. W7AAZ __ 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] Another Better Mouse-trap?
Geoff said A noise gate placed in the signal path can be a source of IMD products, even when it is not active. IMHO a separate noise receiver which can be tuned over a limited frequency range above the band in use to avoid real signals, whose output inhibits LO drive when noise is present, plus the required delay in the signal path, is a useful recipe for a noise blanker. That's why shutting the LO off is such a nice way to blank. Except for the expected result of blanking itself, there's no new circuitry and no additional IMD when the LO is running. I had an idea of doing another noise receiver, also TRF, that tuned HF and thought I could combine the blanking pulses from both noise receivers. But ran out of steam and never tried to do it. W7AAZ __ 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] K3 Memory Management Program
Does anyone know of a Memory Management Program for the K3 that makes possible downloading, manipulating and uploading frequency settings? Thanks, Fred AK5U ... FBL === __ 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] Elecraft SSB Net results (8/09/09)
Signal levels still were way down, and check-ins were light. At the end of the net, AK5U asked about K3 memory management software. He is inquiring on the reflector. We ran 13 minutes and had 15 participants. Here is a list: Station NameQTH Rig S/N AD5SX PaulNM TS480 W0OGH Larry AZ K3 763 N0TAJohnCO K3 994 AK5UFredTX K3 3246 W0FMTerry MO K3 474 NZ0TBillKS K3 1502 AE6IC FredCA K3 2241 WA5BDU NickAR K3 1195 N8KJC Joe MI AI4VZ George GA K3 2412 KD5ZLB Edwin LA K3 3147 W0NTA DickCO K3 1208 W1RFB MarkMA K3 427 KM5QWindy NM K3 764 NS7PPhilOR K3 1826 Thanks to everybody who checked in. Have a good week. 73, Phil, NS7P __ 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] K3 Memory Management Program
This isn't quite what you are looking for, but it may do the job: http://home.roadrunner.com/~n2bc/SW.htm Fred Lozo wrote: Does anyone know of a Memory Management Program for the K3 that makes possible downloading, manipulating and uploading frequency settings? Thanks, Fred AK5U ... FBL === __ 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 -- View this message in context: http://n2.nabble.com/K3-Memory-Management-Program-tp3419061p3420177.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] KPA100 speaker
Hey gang: When installing the KPA100 in an EC2 enclosure, should I install the speaker ??? Not sure if hooking up the KPA100 / KAT100 in the EC2 will mute the speaker in the rig Just curious 73 JerryN0JRN __ 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] KPA100 speaker
Jerry, The speaker in the KPA100 will not be active when mounted in the EC2 enclosure unless special provisions are made for connecting it. Never-the-less, I recommend mounting and wiring it in case you ever decide to mount it on the base K2 (or sell the KPA100). The speaker in the base K2 will work as normal - the speaker in the KPA100 will not be connected and therefore will be silent. 73, Don W3FPR n0jrn wrote: Hey gang: When installing the KPA100 in an EC2 enclosure, should I install the speaker ??? Not sure if hooking up the KPA100 / KAT100 in the EC2 will mute the speaker in the rig Just curious 73 JerryN0JRN __ 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: 8.5.392 / Virus Database: 270.13.49/2294 - Release Date: 08/10/09 06:10:00 __ 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
[Elecraft] W2 Sensors
Anyone know the physical size of the W-2 watt meter sensors? Tn Phil __ 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] W2 Sensors
Hello Phil, The sensors measure 2.25 x 2.25 x 5.00 inches not including the RF connectors. 73, Bob, N6CM On Mon, Aug 10, 2009 at 4:39 PM, Phillip Buckholdtk8mb...@wadsnet.com wrote: Anyone know the physical size of the W-2 watt meter sensors? Tn Phil __ 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] No K2 Sidetone
I set my K2 aside for a week and when I came back to it, I have no sidetone. I have ST L set to 135, but turning it up all the way makes no difference. It's transmitting a signal no problem. Just no side tone. Any suggestions would be appreciated. Rick VE9HF __ 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] K3 VFO/RIT hash rehashed
Trying again in hopes that Hughes will not reformat my basic plain text to HTML or Rich Formating.Third time is charm hopefully and sorry about this... Approximately one month ago I brought to the Digest information on my six-month-old K3 involving noise generated while tuning either the VFOs or RIT while on the 10 meter CW band. It was at a level of two S meter bars where it peaked around 28000 and again at 28045 KHz. This also showed up on my receiver on 6 meters where it manifests itself as audible steps while tuning threshold level CW signals such as on the EA6 I worked in June. Although my K3 doesn't have 5 MHz tuning hash, there are also some that were reported. Wayne responded to me while on his vacation and promised to look into it further upon return to work in mid July. Since then I've been contacted with possible fixes after it was determined that the hash was SPI bus related radiation into the front end of the receiver. I was forwarded a pre release Beta Firmware version to try and it confirmed that their findings at the factory corrected this issue. I was also informed that, if needed, there are other simple component related fixes involving the PCB serial bus that will be possible. I'm happy to report that on my factory built K3 S/N 2274, has most of the hash eliminated with only the firmware. Wayne is in the process of finalizing all the avenues by which those who have this issue can resolve it. This is not a universal K3 issue. I know many K3 users who don't have this condition. Only some have experienced this and they can deal with this once there is a finalized firmware/hardware upgrade. I understand that this will be available within a few weeks. I wish to finish by expressing my thanks to Wayne and the Elecraft team who are handling this with excellent service and professional expertise. We are lucky to have such a great product Designed and Made in USA Amateur Radio high tech multi-mode transceiver. Cheers John, W1QS ex N6JL K3 s/n2274, K2 s/n4204 __ 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] No K2 Sidetone
Rick, This comes up frequently, and thankfully was solved by firmware version 2.04r. Earlier versions had a toggle to change the sidetone source between U6-25 and U8-4 in support for older K2s without the wiring change for the sidetone source. If your K2 is above SN 3000 or below that and has had either the KIO2 or KPA100 added, your sidetone source must be U8-4, and for those few K2s that do not fit that description, the source is U6-25. Enter the menu for STL, edit the parameter and set the level to something reasonable (20 to 40 range), and then tap DISPLAY to toggle between the two sources. Stop when you hear sidetone and exit the menu - problem solved. 73, Don W3FPR Williams, Richard (OAG/CPG) wrote: I set my K2 aside for a week and when I came back to it, I have no sidetone. I have ST L set to 135, but turning it up all the way makes no difference. It's transmitting a signal no problem. Just no side tone. Any suggestions would be appreciated. Rick VE9HF __ 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: 8.5.392 / Virus Database: 270.13.49/2294 - Release Date: 08/10/09 06:10:00 __ 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] K1 with low output on 30,15 meters
Just purchased a K1 from a ham that said that it was work 100%. Right.Full output on 40 and 20 meters. No output on 30 and 15 meters. Please help me on this one. Thanks. 73 Gene, N0MQ __ 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] Anyone have a KAF2 for sale?
Would like to purchase an audio filter for the K2. Philip L. Graitcer, W3HZZ 926 Myrtle Street Atlanta, GA 30309 404-872-7337 404-245-9780 (mobile) www.philipgraitcer.com pgra...@mac.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] HD15 Y for splitting K3 ACC
For anyone needing to run multiple devices simultaneously off the K3's ACCessory port, I've located a source of an HD15 Y splitter that has all 15 pins connected through, and none shorted to the shield (unlike most that are made for VGA use). I don't actually have multiple accessories to try it with, but it checks out with a continuity tester. It's part number 10H1-27708 from www.cablewholesale.com, cost $2.40ea. Hope it's useful to someone... ~Iain / N6ML __ 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
