[Elecraft] Fw: FS K2#2571
- Original Message - From: Brent Sutphin WB4X [EMAIL PROTECTED] To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; elecraft@mailman.qth.net Sent: Friday, October 29, 2004 4:58 AM Subject: FS K2#2571 I built this K2 with great care and have enjoyed it very much. It is a proven preformer. I have worked all states QRP and worked 135 countries using it. It is a great rig, but I want to build another. So I offer this one for sale. It is in excellent condition and comes with many options. K2 - serial number 2571 Firmware upgraded to version 2.03d and 1.07 KNB2 - Noise Blanker KAF2 - Audio filter/clock KIO2 RS 232 Interface KSB2 - SSB KAT2 - 20 watt antenna tuner Serial cable Radioshack hand mic The K2 has teh following upgrades; BFOMDKT - BFO Toroid PLL Ref Osc Xtal Upgrade FWK2MCIO - K2 MCU IOC Upgrade K2ATOBKT - K2 Rev A to B Upgrade K2KSB2XTLS - Matched Filter Crystals XFLMDKT - 2nd Filter Upgrade . All manuals and documentation $895 + shipping/insurance. Please email if you have any questions Thanks Brent WB4X __ ___ 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] Comparing HexKey CW Paddle
Along the same lines, do you think the Hexkey would be a good key for someone trying to re-learn the code (I passed the 5 wpm element to get my Tech Plus in 1996, but have yet to use it)? Thanks for any comments. 73, Dan KF4KKF -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Monday, November 01, 2004 10:02 PM To: [EMAIL PROTECTED] Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] Comparing HexKey CW Paddle [EMAIL PROTECTED] wrote: Has anyone been able to compare the new HexKey to keys made by Begali or Schurr? I have a Schurr Portable Wabbler and have had my eyes on the Graciella Vertical Key. Just wondering how thy compare. Jeff Burns AD9T I purchased one upon learning of the availability of them and I've been using it for about a week and a half now. I cannot make comparisons to Begali, Schurr or any other of the legendary keys -- I'm used to my Bencher BY-1 (which is not a bad paddle at all, IMHO), a Vibroplex single lever paddle, a Vibroplex Iambic paddle (emblazoned with a Ten-Tec logo a la Elecraft's on the HexKey), a Palm mini-paddle and that's all I can think of at the moment. I'd rate this HexKey of the most stable both in terms of weight (it ain't gonna move around and I slap the paddles fairly hard!) and in terms of holding a minimal spacing setting, it's the best of the keys I've used. But if you're in the Begali or Schurr league...I just don't know 73, Joe, W2RBA ___ 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] 3rd K2 and BPL
On Wed, 2004-03-11 at 09:23 -0800, Eric Swartz - WA6HHQ, Elecraft wrote: I think that even in the worst case scenario you will have had time to build, use and sell many K2s (and other new products from us) before you would notice any major impact to your daily operating on the air. Even if ham radio ceased to exist, I'd still be happy building Elecraft kits as a hobby - building them is even more fun than using them! :-) We have a lot of goodies in the design pipeline :-) That's what I like to hear... Just finished building my first option for my K2 - the KSB2. I'm working on the KPA100 now. I'll probably build the KDSP2 next. This is addictive... -- 73, Brian VE7NGR ___ 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] Hum Coupling
Hello Allen, My guess is that magnetic fields from power transformers are either 1) being picked up by L30, or 2) that the magnetic fields are going through the cores of L30 and/or T5, and modulating the effective permeabilities of these cores. This will cause a modulation of inductance, and thus a modulation of the VFO frequency. The magnetic field is picked up by L30. To work best, the magnetic shield should completely surround the susceptible parts. Putting the shield on only one side seems to make things worse. Here's a possibility for experimenting with K2 susceptibility: Try using one of those bulk tape erasers near it. They put out huge 60Hz fields. [Just don't get it near your credit/bank cards!] Of course, keep it away from the latching relays. I used a tape head demagnetizer. Placing the probe near the base of L30 causes a vast huge amount of FM. Don't try this unless you cut the current way down. Looking on the scope, FM modulation is at 60 Hz, not 120 Hz, so we're not modulating the permeability, we seem to be inducing a 60 Hz voltage onto L30/T5 which is modulating the varacters. What I don't understand is this: I figure L30 has perhaps 14 turns, and 2.3 ohms winding resistance. I figure that the effective aperture is 1 cm squared. I figure that the winding resistance of T5 is 0.05 ohms, so a 1 gauss vertical 60 Hz field will induce 37 micro volts on T5. That should cause 0.3 Hz FM modulation on 80 meters. No one should notice that? BTW, I calculated 2.3 ohms from the Q, sensitivity at T5 goes way up if L30 has less resistance. I know that the cup and core used in L30 will focus any external field through the winding, but I don't know how to calculate how much. It would be nice if someone could put an L30 (TOKO T1005Z 4.7 uH) into a Helholtz coil and get the numbers on it (uV/gauss at 60Hz, winding resistance). 73, Michael ___ 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] Cost Effective Balun
I have read a lot about baluns, and still cannot decide what to get. I have a KAT100 and, want to experiment with several antennas fed with open wire line. From all the discussions of baluns I have a formed a few impressions. 1. For QRP operation the balun is probably not needed. 2. Use a 1:1 balun unless you know your antenna system has high impedance on all bands of operation. 3. For multi-band operation make the balun really big to handle any waste heat. With these ideas in mind I am tempted to get a super heavy duty balun like the ones form DX Engineering. The $100 plus price tag on these big baluns is encouraging me to take a look at cheaper alternatives. One alternative is to make a heavy duty balun form a kit. Any comments on the various kits available? Two sources I have located are: http://www.amidoncorp.com/aai_cost_experimenter.htm and http://thewireman.com/index.shtml Another alternative is Elecraft's BL1. Is this little balun really up to 100W service for multi-band antennas? Has anyone found a good enclosure for the BL1? Can a switch be used to switch from 1:1 to 1:4 configurations? Thanks for taking one more look at this old topic. Jeff Burns AD9T ___ 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] Digipan 2.0 question
I note Digipan has a setup for some of the Icom radios to use serial data to command TX and RX negating the need to use DTR of any of the port control signals. Does anyone know if any of these selections are compatible with the K2? 73, Jim W4ATK K2 #4028 ___ 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] Comparing HexKey CW Paddle
No opportunity to compare the HexKey to anything yet. When I placed my order on the Elecraft website last week, I got an email confirmation the next day saying the KHXKEY is on backorder for approximately 5 weeks... -de N7BNT Doug === On Nov 1, 2004, at 6:00 PM, Jeff Burns wrote: Has anyone been able to compare the new HexKey to keys made by Begali or Schurr? I have a Schurr Portable Wabbler and have had my eyes on the Graciella Vertical Key. Just wondering how thy compare. Jeff Burns AD9T ___ 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
[Elecraft] Putting the K2 in K2ZR/FD; 3rd in 1A-b
Hi Gang, Just a quick gloat from the Buffalo Lighthouse Crew 1A-Battery FD event 2004. We finished 3rd using my K2 (SN543) and 4 Windoms hung from the top of the Buffalo Lighthouse. The K2 continues to be THE radio for this type of operation. Any laptop and a K2 can go the full event without making a deep cycle battery breath hard :-) And the other group operating from the USS Sullivans, just a stones throw up the shipping channel, and operating with real power, is not even noticed unless we are on the exact same frequency working each other. It also helps having a very nice antenna setup. K2ZR built 4 Windoms cut for 80M using 4:1 current baluns. They were hung as slopers in 4 compass directions and run to an antenna switch with 4 equal lengths of coax. A piece of LMR600 then ran to the operating position. The antennas had low SWR on all the bands making for low unmatched losses and child's play for the K2's internal tuner. It was great to be able to have gain in 4 directions at the flick of a switch. See y'all in FD 2005, same weekend, same place. Oh, next year we'll be looking to close some more of the gap between us and our 2 rivals K6MI and N4BP. (Yeah, I know it's not a contest.) 73, Mark K2QO Buffalo Lighthouse Crew ___ 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] Ham shop nr Washington DC
Thanks for all the response. Looks like it is more then a little detour and also I found that HRO does not sell the Sierra sidekick. Next time better Nick, PAØNCV - Original Message - From: Nick Verbeek [EMAIL PROTECTED] To: Elecraft@mailman.qth.net Sent: Monday, November 01, 2004 8:22 PM Subject: [Elecraft] Ham shop nr Washington DC I am flying this friday into Washington (Dulles Int'l), rent a car and will drive north towards Harrisburg (PA). All for only a short visit. Is there any respectable Ham radio shop in the area where I can do some shopping without going into too much of a detour? I am actually looking to buy a Sierra mobile whip (or similar) Anybody from the area with a suggestion? 73, Nick, PAØNCV K2 #1510 KX-1 # 681 ___ 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
[Elecraft] Re: Putting the K2 in K2ZR/FD; 3rd in 1A-b
Nice work, Mark! Several K2 users have mentioned how well the rig worked for them at Field Day. This is gratifying for Eric and me, since that's exactly what we designed it for :) Now if I could just get out of the lab and into the great outdoors more often 73, Wayne N6KR On Nov 3, 2004, at 1:34 PM, Mark S. Adams, P.E. wrote: Hi Gang, Just a quick gloat from the Buffalo Lighthouse Crew 1A-Battery FD event 2004. We finished 3rd using my K2 (SN543) and 4 Windoms hung from the top of the Buffalo Lighthouse. The K2 continues to be THE radio for this type of operation. Any laptop and a K2 can go the full event without making a deep cycle battery breath hard :-) And the other group operating from the USS Sullivans, just a stones throw up the shipping channel, and operating with real power, is not even noticed unless we are on the exact same frequency working each other --- 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] Cost Effective Balun
Jeff, Someone has misinformed you a little. See below: At 03:31 PM 11/3/2004, you wrote: I have read a lot about baluns, and still cannot decide what to get. I have a KAT100 and, want to experiment with several antennas fed with open wire line. From all the discussions of baluns I have a formed a few impressions. 1. For QRP operation the balun is probably not needed. Depends on the feed line. I guess you can run the KAT2 on the K2 into a balanced line by grounding one side. Works. Probably works better with a balun. 2. Use a 1:1 balun unless you know your antenna system has high impedance on all bands of operation. A 1:1 balun actually works as well feeding an open wire line as the more common 4:1 current balun. Take a G5RV for example. The bands where the impedance is closer to 50 ohms and those where it is closer to 200 ohms are about the same. The current baluns works better for this application. A 1:1 balun is a current balun. You have to be careful that the balun or kit you buy is a current balun. Most will say, but some don't. 3. For multi-band operation make the balun really big to handle any waste heat. This is wrong. First of all, if you are going to waste power, a big balun or a small balun will waste the same. You just won't notice it on a large balun. I have used a 2 core balun using F-114-43 cores on 100 watts with a reactive load with a SWR of 5:1 without the balun getting hot. Measured efficiency on the balun under these conditions was about 93%. Losses at100 watts were 7 watts, well under 1 dB. Efficiency into a 200 ohm load was 97%. With these ideas in mind I am tempted to get a super heavy duty balun like the ones form DX Engineering. The $100 plus price tag on these big baluns is encouraging me to take a look at cheaper alternatives. One alternative is to make a heavy duty balun form a kit. Any comments on the various kits available? Two sources I have located are: http://www.amidoncorp.com/aai_cost_experimenter.htm and http://thewireman.com/index.shtml With the idea that you don't need a KW balun for 100 watts, try the Elecraft BL1. LDG has a kit, in an enclosure. It works ok, but it is a voltage balun and not a current balun. Also, NJQRP offered a low power (read 100 watts) balun kit in 2002. Details are at www.njqrp.org under retired projects. You can buy the parts yourself. They will run $15 to $20 at most. Another alternative is Elecraft's BL1. Is this little balun really up to 100W service for multi-band antennas? Yes. I never measured its efficiency, but it should be about the same as the NJQRP kit. It covers 160 to 6 meters, where the NJQRP kit covered 160 to 10 meters. Has anyone found a good enclosure for the BL1? Can a switch be used to switch from 1:1 to 1:4 configurations? Possible, but not a good idea. Really not needed. I use Bud plastic enclosures which you can buy from a distributor or a similar one from Radio Shack. I have a nice two core balun ala NJQRP built into a Sucrets box. Thanks for taking one more look at this old topic. Anytime. 73, Chas Jeff Burns AD9T ___ 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] HFPack amp kit
Steve, KZ1X, Thanks for copying my Ad to the Elecraft List! Just wanted to let everyone know that the HF Pack Amp Kit has been sold! I built the Elecraft KPA100 Kit instead, for my K2. 73, Carl, WN3DUG ___ 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 S/N 4226 60m VCO value
Greetings All, Finished up the 60meter module, and ran into a hitch during the 40/60 meter alignment (p. 13). VCO voltage at R30 was only 0.87 volts at 5300. At 5450, VCO was 1.0 volts. Re-checked the VCO numbers for other bands, and at 4.0 MHz, the Voltage was at 6.0 volts. After checking components (OK), and solder joints (OK), and perusing the archives, arrived at the decision to adjust L30 to get the 1.0 volt (minimum) at 5300. I then checked other VCO values for the band(s) edges, and the max VCO was 7.0 volts at 4.0 MHz. L30 was adjusted about 1/4 turn clockwise (about where the factory had it, originally). It _appears_ that this set up is OK based upon what I read in the archives, although no one has commented on this problem with addition of the K60XV. Comments? Questions? Is My K2 Ruined (IMK2R) ? Thanks, Kenyon Cox WD8INS Belpre, OH -- Debian 3.0 XFS 19:25:01 up 8 days, 13 min, 1 user, load average: 0.04, 0.15, 0.12 ___ 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] Hum Coupling
Hi Michael, Thanks for your comments. I think you are on to something. The only hope for lower magnetic field susceptibility for the K2 would be if either the VFO circuit were changed so as not to use an inductor for adjusting the quiescent resonance point of the VFO, or good magnetic shielding were used. One possibility would be to use a gapped pot core with slug tuning for L30, but it might be difficult to get sufficient adjustment range. Or, perhaps one could use some kind of shield for L30 alone. The standard sort of thing for low-level or precise RF circuits is to enclose them all in steel shielding, with steel partitions between circuit sections or stages (it's called egg crating). It's something Elecraft could keep in mind for a K3. If I had a K2 in front of me, I think I would try to put some kind of shielding around L30. Here is the web site of one vendor of shielding materials: http://www.lessemf.com/mag-shld.html By the way, I would guess that the Q of that Toko T1005 coil is determined by not only DC resistive loss in the wire, but also skin effect loss and core loss (and circulating currents from distributed capacitance, etc., etc.). I suppose we will never know for sure, as RF work at some point gets very empirical -- we just have to try it out, and if it works we're on to solving the next problem. Best of luck, 73, Allen Walker From: Masleid, Michael A. [EMAIL PROTECTED] To: A Walker [EMAIL PROTECTED] CC: Elecraft@mailman.qth.net Subject: RE: [Elecraft] Hum Coupling Date: Wed, 03 Nov 2004 13:01:47 -0600 Hello Allen, My guess is that magnetic fields from power transformers are either 1) being picked up by L30, or 2) that the magnetic fields are going through the cores of L30 and/or T5, and modulating the effective permeabilities of these cores. This will cause a modulation of inductance, and thus a modulation of the VFO frequency. The magnetic field is picked up by L30. To work best, the magnetic shield should completely surround the susceptible parts. Putting the shield on only one side seems to make things worse. Here's a possibility for experimenting with K2 susceptibility: Try using one of those bulk tape erasers near it. They put out huge 60Hz fields. [Just don't get it near your credit/bank cards!] Of course, keep it away from the latching relays. I used a tape head demagnetizer. Placing the probe near the base of L30 causes a vast huge amount of FM. Don't try this unless you cut the current way down. Looking on the scope, FM modulation is at 60 Hz, not 120 Hz, so we're not modulating the permeability, we seem to be inducing a 60 Hz voltage onto L30/T5 which is modulating the varacters. What I don't understand is this: I figure L30 has perhaps 14 turns, and 2.3 ohms winding resistance. I figure that the effective aperture is 1 cm squared. I figure that the winding resistance of T5 is 0.05 ohms, so a 1 gauss vertical 60 Hz field will induce 37 micro volts on T5. That should cause 0.3 Hz FM modulation on 80 meters. No one should notice that? BTW, I calculated 2.3 ohms from the Q, sensitivity at T5 goes way up if L30 has less resistance. I know that the cup and core used in L30 will focus any external field through the winding, but I don't know how to calculate how much. It would be nice if someone could put an L30 (TOKO T1005Z 4.7 uH) into a Helholtz coil and get the numbers on it (uV/gauss at 60Hz, winding resistance). 73, Michael _ Check out Election 2004 for up-to-date election news, plus voter tools and more! http://special.msn.com/msn/election2004.armx ___ 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 - SN4511 Diffuser Question
Hi all, Received today in post K2 S/N 4511. Just doing inventory check at this point but trying to make sure I understand work task. I am a bit confused with LCD backlight diffuser. It has a really nasty looking thin film on top which appears to be protective only then below it another matt white thin film which appears to be attached at LED ends of the diffuser only. Looking at the instructions it appears to say that I should not remove any of these. Help please. Do I remove the top one which looks awful, both or none? Thanks Malcolm, K1VZ ___ 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
