[Elecraft] Let me build your K2
I have built 100+ K2's to date, and all of the other Elecraft kits. Let me build your radio. My rates are reasonable and you get a built radio ready to play. 73 Alan W1HYV ___ 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] QRP AField on Appalachian Trail
Hello, Today if the thunderstorms hold off until the evening I plan on operating the QRP AField sprint for a few hours on the Appalachian Trail. I was planning to go out over night but a knee injury has curtailed that trip. So I will be out on the AT in PA after 16:00 UTC. Will start out on 40, then 20. I will call CQ on 15 meters on the hour. I will be using my K1 and WA3WSJ's VBWFPA. 72 and Thanks, Ron Polityka WB3AAL www.wb3aal.com www.n3epa.org/ K1 - SN 01011 K2 - SN 01392 ___ 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] Re: Algorithm for Tuner (Don)
Date: Fri, 16 Sep 2005 08:51:33 -0700 From: Don [EMAIL PROTECTED] Subject: Re: [Elecraft] Algorithm for Tuner To: Bill Coleman [EMAIL PROTECTED] Cc: elecraft@mailman.qth.net Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; format=flowed; charset=iso-8859-1; reply-type=response Bill, It's worse than that. Even with my reed relays (very fast compared to conventional relays) I have to allow 10 mS for them to settle and the A/D requires a millisecond or so to read the forward and reflected power. Don, Why not take an approach normal to the manual tuner. That is capacitance to mid scale and adjust L to best. Then adjust C up or down from midscale for min. ? Doing this with a possible repeat for missing the L value by +/- 1 has always yielded me good fast manual results on my old mfj tuners and doesn't require a tremendous number of iterations or complex programming. best regards, Charles wb5izd A reiterative multilevel slope-sensing algorithm using decreasing granularity* is the answer. I have been slowely creeping up on a satisfactory solution and, depending on distractions, hope to have a fairly fast autotuner in a week or so. Suggestions from the list have been very helpful. * my term ... don't try to look it up! ;) Don K7FJ On Sep 15, 2005, at 11:22 AM, Craig Rairdin wrote: In this particular case, if you were to iterate over all possible combinations of L and C it's only necessary to store the best result so far and compare the current result to the best result. If the current result is better, it becomes the new best. Now you have no sorting at all and your time is order N instead of order N^2. The problem with the exhaustive search is there are 2^17 = 131,072 combinations to try. (256 cap and inductor values, plus reversing the whole L network) It takes a few ms for each relay to physically switch. If you can try 100 combinations a second (10 ms), that's still about 20 minutes to try them all. Even with 1 ms switching time, you're still looking at 2 minutes to find a match. A tough problem. Bill Coleman, AA4LR, PP-ASELMail: [EMAIL PROTECTED] Quote: Not within a thousand years will man ever fly! -- Wilbur Wright, 1901 ___ 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] WA3WSJ: ARRL EPOE!
Hello all, I will participate in the ARRL's Emergency Power Operating Event today. Look for me mobile from PA around 1500utc. I will send out a special EPOE QSL Card. Please send a SASE and a #10 envelope to WA3WSJ CBA. As always all contacts count towards a Nomad Award. Check it out at http://www.wa3wsj.com Hope to work you today on HF ssb and cw 40m and 20m or 2m FM 146.520mhz. 72/73, Ed, WA3WSJ ___ 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] Re: Algorithm for Tuner (Don)
Charles, I have tried that method ... ditto setting L and searching for best C. It works but is no better than the one I am using now which is to begin with both L and C at 0 and then search for the best C for every L as L increases from 0 to max. The searching is done in large steps (coarse granularity, to use Waynes term) so it doesn't take very long to cover the range. When a best solution is found the steps are then decreased in size while searching a limited range around that solution. Typical solutions take from 5 to 10 seconds and I know it could be much quicker using a more clever algorithm. I am happy with what I have because once a solution is found and stored the tuner tunes from memory anyway, switching in milliseconds. I keep pursuing this because of the challenge, the same reason I do crosswords and computer games. Don K7FJ Why not take an approach normal to the manual tuner. That is capacitance to mid scale and adjust L to best. Then adjust C up or down from midscale for min. ? Doing this with a possible repeat for missing the L value by +/- 1 has always yielded me good fast manual results on my old mfj tuners and doesn't require a tremendous number of iterations or complex programming. best regards, Charles wb5izd A reiterative multilevel slope-sensing algorithm using decreasing granularity* is the answer. I have been slowely creeping up on a satisfactory solution and, depending on distractions, hope to have a fairly fast autotuner in a week or so. Suggestions from the list have been very helpful. * my term ... don't try to look it up! ;) Don K7FJ On Sep 15, 2005, at 11:22 AM, Craig Rairdin wrote: In this particular case, if you were to iterate over all possible combinations of L and C it's only necessary to store the best result so far and compare the current result to the best result. If the current result is better, it becomes the new best. Now you have no sorting at all and your time is order N instead of order N^2. The problem with the exhaustive search is there are 2^17 = 131,072 combinations to try. (256 cap and inductor values, plus reversing the whole L network) It takes a few ms for each relay to physically switch. If you can try 100 combinations a second (10 ms), that's still about 20 minutes to try them all. Even with 1 ms switching time, you're still looking at 2 minutes to find a match. A tough problem. Bill Coleman, AA4LR, PP-ASELMail: [EMAIL PROTECTED] Quote: Not within a thousand years will man ever fly! -- Wilbur Wright, 1901 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAT2 - Bridge Null Adjustment problem
Well, my KAT2 saga continues. I did indeed find some unsoldered pins on one of the relays, and corrected this. Now, however, I seem to have the opposite problem. When trying to perform the CALn procedure, instead of having too much reflected power, I now have no power (forward or reflected) at all; '000' shows all the time on the LCD display, no matter what I do to C55 does and no matter what the Power level is set to. The DC voltages on the REFL and FWD signals paths are zero now. I have checked and rechecked for solder bridges, cold joints and shorts/continuity on the RF cable and control cable, and am running out of ideas (and my sanity)! --- This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain information that is proprietary, confidential, and exempt from disclosure under applicable law. Any unauthorized review, use, disclosure, or distribution is prohibited. If you have received this email in error please notify the sender by return email and delete the original message. Please note, the recipient should check this email and any attachments for the presence of viruses. The organization accepts no liability for any damage caused by any virus transmitted by this email. == ___ 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] Solder requests - STOP
Nick Waterman wrote: I was going to ask, even before this thread... What do Elecraft and Doctor Solder recommend now that 60/40 doesn't officially exist? Anyone? Apart from being told loads of us are stockpiling lead-based stuff while we still can, I've not really had any useful advice on what to do if you want to embrace the future and go lead-free :-) -- Nosey Nick Waterman, Senior Sysadmin. #include stddisclaimer[EMAIL PROTECTED] Printed on 100% recyclable phosphor. ___ 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] OT: Antenna Tuners
Until today, I've been using an Icom AT-180 antenna tuner with my IC-706MKIIG. Well, today, it gave up the ghost. Looking back, it never really did work right. I want to replace it with another auto antenna tuner (in the shack). Any suggestions? Any that will interface with the 706? Thanks Matt - K7OE ___ 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] KAT2 - Bridge Null Adjustment problem
The first thing that occurs to me is that the single turn of wire through the center of T1 may be missing. The second thing is that T1 itself may not be properly wound or properly soldered. Check that the proper color wire is inserted into the proper holes (the color of the wire in hole 2 should be opposite of the color in hole 3). Other than that, there is not much that would produce no voltage out of the wattmeter, but check the soldering and orientation of the diodes. 73, Don W3FPR -Original Message- Well, my KAT2 saga continues. I did indeed find some unsoldered pins on one of the relays, and corrected this. Now, however, I seem to have the opposite problem. When trying to perform the CALn procedure, instead of having too much reflected power, I now have no power (forward or reflected) at all; '000' shows all the time on the LCD display, no matter what I do to C55 does and no matter what the Power level is set to. The DC voltages on the REFL and FWD signals paths are zero now. I have checked and rechecked for solder bridges, cold joints and shorts/continuity on the RF cable and control cable, and am running out of ideas (and my sanity)! -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.344 / Virus Database: 267.11.1/104 - Release Date: 9/16/2005 ___ 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] Solder requests - STOP
You go buy lead free solder, preferably silver loaded, and start using it. No changes needed to your normal soldering methods. On Saturday 17 Sep 2005 19:04, Nick Waterman wrote: Nick Waterman wrote: I was going to ask, even before this thread... What do Elecraft and Doctor Solder recommend now that 60/40 doesn't officially exist? Anyone? Apart from being told loads of us are stockpiling lead-based stuff while we still can, I've not really had any useful advice on what to do if you want to embrace the future and go lead-free :-) -- Nigel A. Gunn. 59 Beadlemead, Milton Keynes, MK6 4HF, England. Tel +44 (0)1908 604004 e-mail [EMAIL PROTECTED] or [EMAIL PROTECTED] wwwhttp://www.ngunn.net or http://www.ngunn.demon.co.uk Amateur radio stations G8IFF, KC8NHF Member of AMSAT-UK #182, ARRL, GQRP Club, QRPARCI, SOC #548 RAYNET Flying Pig #385, Dayton ARA #2128, AMSAT-NA LM-1691, ___ 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] KAT2 - Bridge Null Adjustment problem
R6 is currently uninstalled ... I am still trying to do the CALn null adjustment ... as I said, instead of having HI showing up continuously, I know have only '000' on the display. (I don't know if this is significant, but the manual says the display should look something like '075 ATU' but I only see '000', not '000 ATU' ... In any event, I have checked T1 3 times already, reheated the leads, made sure the green jumper cable across it is in place ... again checked continuity of the RF cable and of course checked for the 3rd time that the ground and hot leads weren't reversed ... Gonna pull it apart again and look at the soldering on the relays AGAIN ... this situation changed when I soldered a row of pins on one of the relays that I had missed I think I was better off when they ere unsoldered! At least I had SOME output! :-) -Original Message- From: k4zm [mailto:[EMAIL PROTECTED] Sent: Saturday, September 17, 2005 4:28 PM To: Sanger, Joseph Subject: Re: [Elecraft] KAT2 - Bridge Null Adjustment problem Have you installed R6 yet? Page 17 - 5th step is to install a 47 ohm 1/4 watt resistor in the KAT2. This is the info to the K2 microprocessor to set the power level out of the K2. 73 Jim K4ZM --- This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain information that is proprietary, confidential, and exempt from disclosure under applicable law. Any unauthorized review, use, disclosure, or distribution is prohibited. If you have received this email in error please notify the sender by return email and delete the original message. Please note, the recipient should check this email and any attachments for the presence of viruses. The organization accepts no liability for any damage caused by any virus transmitted by this email. == ___ 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
