[Elecraft] KPA-100 Problems
Hi Guys, I am having problems with the KPA-100. 80m reports of distorted audio, like a vibrating effect associated with it. And even when I have the PO adjusted to a max of 15 watts it seems to transmit up to 60w out. I know it's not RF feedback caused by antenna because I have the same problem with a dummy load. Any suggestions would be appreciated. Dave ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] de-sensitizing C22
Good morning to all First of all my K2 (base CW) is finally complete and has passed all of the basic tests with flying colors. Now that I can receive on all bands, I decided to go back and do a more thorough calibration of the 4MHz reference clock and then start on the filters before moving on to build the SSB module and the 100W amp. After reading through some of the reflector archives, checking some of other resources on the Elecraft site and passing some emails back and forth with Tom, N0SS, I finally got a good understanding of how the calibration works and what needed to be done. I am able to get pretty close, in fact I had it within 50Hz to start with, and at one point had it at about 23Hz off. However, that is about as good as I have been able to get it. Once I get to a certain point, just breathing seems to move the frequency when adjusting C22. I know I am really close, but I would love to see if I can really get it closer. So my question for the group here is there any way to make C22 not so sensitive to even just touching it with an alignment tool?? I have read where some have added a cap in parallel with C22 to extend the range, but would this also help it to not be so touchy to adjust?? Or should I just look to replace C22 entirely with a different cap?? I know I shouldn't be quite so picky, but hey, that is the fun of building the radio. You can tweak things and make it do what you need/want it to do. I also must say that I am REALLY impressed with this radio so far. It does receive very well, and the filters seem to be working VERY well with just the default alignment. I am really getting excited to see how well it will work once I get Spectrogram and do it right. Anyway, thanks for letting me ramble on here and thanks in advance for the help!! 73! Vern -- KC8YOH __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] General SMD Soldering Question
This is distantly related to the mainstream of QA on this net.I intend to use my new K2 to drive a Icom IC-2KL amplifier. Please imagine for now, there is an intermediate amp between the K2 and the 2KL. One of the twin PA boards on the 2KL ( a backup, I have 2 of them) is unfortunately, smoked. My immediate task is to solder a pair of 1KV Syfer ceramic SMD 0.1 mfd caps between two troubled pcb tabs in the PA output coupliing stage, where the previous incumbents were vaporized, by previous owner. I think he/she ran it into a low R/high C load on 80 or 160. This is a heavy solder job at least as heavy as the KPA100 (judging from the manual). I think I may need to solder extension tabs to the caps, which are about 5mm wide, to bridge a 10-15mm gap between the tabs on the PA board. Of course, I need to clean up all the carbon residu on the PA board and tidy up the tabs first. How does one go about this task? Is a solder iron loke a Hakko 936 the best tool or should I use a hot air SMD soldering unit or even an oven? Should I use solder paste or ordinary 63/37 Kester 44? What temps shuld one use? I normally run the Kester 44 at 750F, as per the recommendation on their website. Comments much welcomed. Wyn, VR2AX ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] de-sensitizing C22
Vern, Use a long slender metal screwdriver that nicely fits into the cap slot and you will find it much easier to adjust. If you are using the alignment tool supplied with the K2, it is too flexible for precise adjustment. If you mounted C22 the right way 'round, the adjustment slot should be grounded, so you can use a metallic screwdriver without changing the capacitance. I must admit that it is still a bit 'touchy', but it is much less so with a solid tool. I believe it was John Grebenkemper KI6WX who wrote something up on changing the range of C22 a while back - it should take a smaller capacitor in series with the trimmer (change C21) as well as adding a cap in parallel with the trimmer to get the total capacitance value back where it should be. It might be on the LA3ZA mod list. http://www.qslnet.de/member/la3za/K2/mod.html , but you could experiment with the values to get the trimmer range that you want. 73, Don W3FPR -Original Message- First of all my K2 (base CW) is finally complete and has passed all of the basic tests with flying colors. Now that I can receive on all bands, I decided to go back and do a more thorough calibration of the 4MHz reference clock and then start on the filters before moving on to build the SSB module and the 100W amp. After reading through some of the reflector archives, checking some of other resources on the Elecraft site and passing some emails back and forth with Tom, N0SS, I finally got a good understanding of how the calibration works and what needed to be done. I am able to get pretty close, in fact I had it within 50Hz to start with, and at one point had it at about 23Hz off. However, that is about as good as I have been able to get it. Once I get to a certain point, just breathing seems to move the frequency when adjusting C22. I know I am really close, but I would love to see if I can really get it closer. So my question for the group here is there any way to make C22 not so sensitive to even just touching it with an alignment tool?? I have read where some have added a cap in parallel with C22 to extend the range, but would this also help it to not be so touchy to adjust?? Or should I just look to replace C22 entirely with a different cap?? I know I shouldn't be quite so picky, but hey, that is the fun of building the radio. You can tweak things and make it do what you need/want it to do. I also must say that I am REALLY impressed with this radio so far. It does receive very well, and the filters seem to be working VERY well with just the default alignment. I am really getting excited to see how well it will work once I get Spectrogram and do it right. Anyway, thanks for letting me ramble on here and thanks in advance for the help!! 73! Vern -- KC8YOH ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KPA100 spurs
Hi I just installed a new X1 XTAL 18.432, as a part of upgrading the KPA100. I used components obtained locally. Stability of KPA100 is improved, at least it stopped oscillating on 17m band when I use SSB. But Now I find lots of spurs. Here is a list: 18.080, 21.415, 24.903, 24.984, 28.015, 28.260, 28.671, 29.314 these are definetly from X1 as the freq shifts when PA is turned on by setting the power 10w. Any suggestions 73, Matti -- Marteinn SverrissonTF3MA Langitangi 2Internet: tf3ma [at] raunvis [dot] hi [dot] is 270 Mosfellsbær http://www.raunvis.hi.is/~tf3ma Iceland ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] General SMD Soldering Question
Wyn, If you have the hot air gun or oven and solder paste and know how to use it, by all means go that route, but if not, then just use the Hakko - you will be soldering two widely spaced tabs on the capacitors rather than finely spaced leads like are encountered on SMD ICs. Yes, the Kester 44 will work just fine if the diameter is small enough to properly control the amount of solder applied. If the copper area is large, crank the heat on the Hakko a bit higher or use a larger iron. Since you have a 15 to 20 mm gap on the PC board, why not use capacitors with leads rather than the SMD variety (unless you already have the SMD caps in hand). The extension tabs that you add will likely have just as much inductance as the capacitor leads. Of course, if this amp is for use at VHF/UHF, then any extra inductance may matter, but likely not for HF. 73, Don W3FPR -Original Message- This is distantly related to the mainstream of QA on this net.I intend to use my new K2 to drive a Icom IC-2KL amplifier. Please imagine for now, there is an intermediate amp between the K2 and the 2KL. One of the twin PA boards on the 2KL ( a backup, I have 2 of them) is unfortunately, smoked. My immediate task is to solder a pair of 1KV Syfer ceramic SMD 0.1 mfd caps between two troubled pcb tabs in the PA output coupliing stage, where the previous incumbents were vaporized, by previous owner. I think he/she ran it into a low R/high C load on 80 or 160. This is a heavy solder job at least as heavy as the KPA100 (judging from the manual). I think I may need to solder extension tabs to the caps, which are about 5mm wide, to bridge a 10-15mm gap between the tabs on the PA board. Of course, I need to clean up all the carbon residu on the PA board and tidy up the tabs first. How does one go about this task? Is a solder iron loke a Hakko 936 the best tool or should I use a hot air SMD soldering unit or even an oven? Should I use solder paste or ordinary 63/37 Kester 44? What temps shuld one use? I normally run the Kester 44 at 750F, as per the recommendation on their website. Comments much welcomed. Wyn, VR2AX ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] FS: KX1 built and tested
For Sale: Selling because I am going to build my own QRP rig. KX1 #1046 with KXPD1 paddles with KXB30 module (30 meters) with KXAT1 internal auto tuner Clean, high quality build. Original owner. Works perfectly, on 20/30/40 meters. Comes with all documentation. $450 plus shipping at actual cost. Payment by US postal money order. Shipments to US only. http://www.photogs.org/out/kx1/kx1.jpg http://www.photogs.org/out/kx1/kx1all.jpg ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE:[Elecraft]KSB2
Before you send it off. Check the diodes. I installed 1 backwards and got the same issues. I am referring to the switching diodes on both ends of the crystal filter. Richard Kent, WD8AJG ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Fw: [Elecraft] 4 mHz and C22 bandspread mod
G'day, Time flies, I didn't realise it was so long since this was posted. Regards, Mike VP8NO - Original Message - From: KEN BROWN [EMAIL PROTECTED] To: elecraft@mailman.qth.net | From: John, KI6WX [EMAIL PROTECTED] | Date: Sun, 24 Aug 2003 20:51:50 -0700 | Subject: [Elecraft] 4 MHz Oscillator Mod for Easier Adjustment | The reflector traffic seems to indicate that some folks are having | trouble | setting their 4 MHz oscillator to the desired frequency. I added the | following changes to my K2 4 MHz oscillator about 2 years ago to improve | both its settability and its frequency stability. The mod increases the | bandspread of C22 and significantly reduces the drift in the oscillator. | The drift reduction will only effect the K2 frequency accuracy if you do | a | CAL PLL at a different temperature than when you first set the 4 MHz | oscillator frequency. I haven't tested this change on any other K2 so I | don't know if it will work for all 4 MHz Xtals. | | The change requires two 10pF N750 capacitors. Replace C21 with one of | the | 10pF capacitors. Solder the other 10pF capacitor across X2, the 4 MHz | Xtal. | With this change, the correct frequency is obtained with C22 in about the | middle of its range. If you don't need the frequency stability | improvement, | you can use 10pF NPO capacitors. | | If this change doesn't work in your K2, it can easily be backed out by | removing both capacitors and re-installing the original C21. | | -John | KI6WX ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Blown R58 relpaced, still no power out, does anyone have any hints?
Hi Guys, A few weeks ago I managed to induce a fault into my K2 by transmitting into no load when testing the top band option. I found that R58, the 180 ohm, half watt resitior at the far end of T4 had been damaged and had a value of 4 ohms. So I replaced it and reassembled the K2 and I still have no power out. Before I remove all of the options (ATU, Top Band and SB) and take it back to basics, which will take time will not have for a month or so, can anyone suggest other components I might check.everything else seemed ok including the PA Transistors.. Also, what is the purpose of R58? Sorry guys but i am just not as clever as the rest of you, I do software for a living, not electronics...but I am learning.. Regards, Steve G0XAR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] test, disregard
My emails bounce, I try again. Peter,PE1E ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] Blown R58 relpaced, still no power out, does anyone have any hints?
Steve, With R58 almost a direct short, there is a possibility that the PA transistors were conducting too hard and caused their untimely demise. But it would be best to check the RF voltages first before drawing any drastic conclusions like that. There actually could be any number of guesses about what has failed (everything in the transmit chain) and you need to narrow the field a bit. If you do not have one, build the RF Probe shown in the K2 manual (Troubleshooting appendix, page 9). Then set the K2 power to 5 watts and check the RF Voltages at the points indicated on page 14 of the Transmit Signal Tracing starting with th Xmit Mixer Output - if you are lucky enough to have a signal greater than that indicated continue along the steps until you find the stage where the signal drops significantly. OTOH, if you don't have enough RF at the Xmit Mixer Output, move back to page 12 second column and do the steps properly from the beginning. 73, Don W3FPR -Original Message- A few weeks ago I managed to induce a fault into my K2 by transmitting into no load when testing the top band option. I found that R58, the 180 ohm, half watt resitior at the far end of T4 had been damaged and had a value of 4 ohms. So I replaced it and reassembled the K2 and I still have no power out. Before I remove all of the options (ATU, Top Band and SB) and take it back to basics, which will take time will not have for a month or so, can anyone suggest other components I might check.everything else seemed ok including the PA Transistors.. Also, what is the purpose of R58? Sorry guys but i am just not as clever as the rest of you, I do software for a living, not electronics...but I am learning.. Regards, Steve G0XAR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2: Can't get frequency counter to work on TP2
Hi, I finished construction of my K2 (serial #5400) last month and all was working well. At the time of construction all of the filter alignment went well. It has been lots of fun... I'm selling my Yaesu. :-) Since then I decided to calibrate the VFO on my K2 to get the frequency better aligned. I don't have an accurate frequency generator so followed the instructions in the manual and used WWV as my source. That all went fine but when I went into Cal Fil and wanted to make a change to one of the filters got an 'info 230' message. I searched the list and found that was related to the microprocessor not seeing the BFO frequency during a CAL FIL. I verified that the frequency probe works by doing a CAL FCTR with the probe on TP1. When I move it to TP2 it always shows 0.00. When I first aligned it last month it worked but not now. So... I checked the following... I verified that Q24 is getting turned on via V ALC when CAL FCTR is enabled. I see 7.26V DC when V ALC is on, zero otherwise. Used my RF probe to find the following RMS voltages for Q24. V ALC On Q24 drain5.99 V Q24 source 2.02 V Q24 gate 0 V V ALC off Q24 drain 9 mv Q24 source 15 mV Q24 gate 0 V It looks like the FET is turning on and off according to V ALC. I used my scope to look at TP2 and can see a nicely formed wave form at around 4Mhz, But can't detect it with the internal frequency counter and probe. So to verify the probe and counter works I used the frequency probe to verify 04913.34 MHz on pin 6 of U11 but it shows 0.00 when moved back to TP2 Really confusing... Nothing jumps out at me. Its been years since I did any serious troubleshooting. :-) Anybody have any ideas about what I can do? 73, Carroll (W7CSW) ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] KPA-100 Problems
A few recent units have shown problems that at least sound similar to this one. See, for example: http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-03/msg00676.html http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-12/msg00408.html These two, at least, were due to the KSB2 ALC circuit having insufficient attenuation range to control the output of K2/100's with above-average overall transmit gain on the lower bands. The fix involves adding a resistor and changing another in the KSB2. Gary Surrency at Elecraft was able to provide me the necessary details. 73, Steve VE3SMA __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Building the XG-3
While building the K1, I had to come up with a signal source for alignment on 30m and 17m. The Norcal tuner upper for 30m (10116 kHz) works great as a signal source, but I had to resort to a noise generator for 17m. So I figured I could build myself an XG-3, the WARC band signal generator. I ordered another XG-2, and replaced the 20m, 40m and 80m crystals with the following: X1 - 24906 kHz (12m) X2 - 18096 kHz (17m) X3 - 10106 kHz (30m) I could have used the 18100 kHz crystal left over from building the K1 for X2, and the 10116 kHz crystal stolen from a second Tuner Upper kit for X3. I purchased the crystals I used from Expanded Spectrum Systems for $2.55 each. It seems to works just fine! The last thing to do was place little labels over the silk screened numbers on the board. Put a 12 sticker over the 20, a 17 sticker over the 40, and a 30 over the 80. One final sticker - place a XG3 WARC sticker over the XG2 on the board. If I am not the first to do this, then I apologize for the waste of bandwidth. Otherwise, feel free to build your own or bug Eric and Wayne into making this an official kit. Dan - KX1 #1507 K1 # K2 # ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] TEST....IGNORE
___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] General SMD Soldering Question
Thanks, Don: I have a larger iron and will try that approach first. I could also have tried to source other caps but instinctively went first for something similar to what was there before. Again, greatly appraciate your advice, 73 Wyn, VR2AX - Original Message - From: Don Wilhelm [EMAIL PROTECTED] To: Wyn Hughes [EMAIL PROTECTED]; elecraft@mailman.qth.net Sent: Thursday, July 27, 2006 11:29 PM Subject: RE: [Elecraft] General SMD Soldering Question Wyn, If you have the hot air gun or oven and solder paste and know how to use it, by all means go that route, but if not, then just use the Hakko - you will be soldering two widely spaced tabs on the capacitors rather than finely spaced leads like are encountered on SMD ICs. Yes, the Kester 44 will work just fine if the diameter is small enough to properly control the amount of solder applied. If the copper area is large, crank the heat on the Hakko a bit higher or use a larger iron. Since you have a 15 to 20 mm gap on the PC board, why not use capacitors with leads rather than the SMD variety (unless you already have the SMD caps in hand). The extension tabs that you add will likely have just as much inductance as the capacitor leads. Of course, if this amp is for use at VHF/UHF, then any extra inductance may matter, but likely not for HF. 73, Don W3FPR -Original Message- This is distantly related to the mainstream of QA on this net.I intend to use my new K2 to drive a Icom IC-2KL amplifier. Please imagine for now, there is an intermediate amp between the K2 and the 2KL. One of the twin PA boards on the 2KL ( a backup, I have 2 of them) is unfortunately, smoked. My immediate task is to solder a pair of 1KV Syfer ceramic SMD 0.1 mfd caps between two troubled pcb tabs in the PA output coupliing stage, where the previous incumbents were vaporized, by previous owner. I think he/she ran it into a low R/high C load on 80 or 160. This is a heavy solder job at least as heavy as the KPA100 (judging from the manual). I think I may need to solder extension tabs to the caps, which are about 5mm wide, to bridge a 10-15mm gap between the tabs on the PA board. Of course, I need to clean up all the carbon residu on the PA board and tidy up the tabs first. How does one go about this task? Is a solder iron loke a Hakko 936 the best tool or should I use a hot air SMD soldering unit or even an oven? Should I use solder paste or ordinary 63/37 Kester 44? What temps shuld one use? I normally run the Kester 44 at 750F, as per the recommendation on their website. Comments much welcomed. Wyn, VR2AX ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Looking for Web Sites
Hello, I am working on updating the EPA QRP Club Web site. If you have a QRP related web site of your own, please send me the link. I will place it on the EPA QRP Club web page. 72 and Thanks, Ron Polityka WB3AAL www.wb3aal.com www.n3epa.org ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2 lowest power output
Hi Don, I do not have any power meter which can measure any RF power output less than 1 watt. Could you please advise the minimum output power level of K2 with the power knot fully CCW? BTW, under the SEC menu of K2, the transverter output (without the installation of KV60) can be lowered to 0.1 watt. Would this be the lowest level output of K2? I encounter some problems in building my XV144 and am in communication with Gary. He is very responsive and helpful. Upon solving the problem, I shall come back to this reflector again and let other members know my experience. TNX 73 Johnny Siu VR2XMC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
