RE: [Elecraft] KXAT1 with dipole
--- You should not have had any trouble with a center fed dipole, Dan. The issue with the KX1 ATU, as with any ATU, is impedance extremes. Because of the limited number of inductors and capacitors that could be fitted into the tiny space available in the KX1, it has a more limited tuning range than any of the other Elecraft tuners. The end of a dipole presents a very high impedance, possibly in the thousands of ohms. At the other extreme, a very short antenna will present a very low impedance, often less than an ohm. Actually, end-fed short antennas often tune up more easily because they are working against ground and typically Hams have lousy RF grounds G. Even with several radials the ground impedance will likely be in the tens or, more likely, the hundreds of ohms. That's in series with the antenna so what the tuner is matching is a total impedance of perhaps a hundred ohms or more. The fraction of an ohm that the antenna represents is just part of the total. It's also why such antennas have a very, very low efficiency: often less than a few percent. In your case, I'd suspect you had an unlucky length of feed line. Unless the SWR is truly 1:1 on that feeder, something that is almost never achieved in practice, the feed line acts like a random impedance transformer. I suspect you got unlucky and the combination of the effect of surrounding objects, antenna length, feeder impedance and feeder length all added up to an impedance the KX1 ATU couldn't handle. Adding a few feet of feed line will usually fix that. Another possibility is a short or open, as you suggested. Ron AC7AC Thanks,Ron and all of those who replied for the good advice. I'm betting you're right on the money as far as feedline length. I'll put the antenna back up and check it with my dipper to see how it reads, and also with the rig in 'cal' (tuner bypass) mode. That'll tell me also if there's a short somewhere too. I tend to forget about the feedline length as I often just use an endfed wire from the KX1, or at home I use ladder line. I know this can still happen with ladder line, but perhaps less of an issue than coax.Besides, the ol' Johnson matchbox is pretty forgiving:) -- Dan Presley-N7CQR-Portland, Or QRP-L #502 ARS #71 [EMAIL PROTECTED] ___ 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] KXAT1 with dipole
Guys, my money is on the connector on the feedline. It must have a short developed since the last time you used it. Or the short might be at the antenna feed point. The feed line length is just not a factor even when there is RF on the shield, and there is some. The MFJ Antenna Analyser will find the problem. I love mine. 73 Karl K5DI Dan Presley wrote: --- You should not have had any trouble with a center fed dipole, Dan. The issue with the KX1 ATU, as with any ATU, is impedance extremes. Because of the limited number of inductors and capacitors that could be fitted into the tiny space available in the KX1, it has a more limited tuning range than any of the other Elecraft tuners. The end of a dipole presents a very high impedance, possibly in the thousands of ohms. At the other extreme, a very short antenna will present a very low impedance, often less than an ohm. Actually, end-fed short antennas often tune up more easily because they are working against ground and typically Hams have lousy RF grounds G. Even with several radials the ground impedance will likely be in the tens or, more likely, the hundreds of ohms. That's in series with the antenna so what the tuner is matching is a total impedance of perhaps a hundred ohms or more. The fraction of an ohm that the antenna represents is just part of the total. It's also why such antennas have a very, very low efficiency: often less than a few percent. In your case, I'd suspect you had an unlucky length of feed line. Unless the SWR is truly 1:1 on that feeder, something that is almost never achieved in practice, the feed line acts like a random impedance transformer. I suspect you got unlucky and the combination of the effect of surrounding objects, antenna length, feeder impedance and feeder length all added up to an impedance the KX1 ATU couldn't handle. Adding a few feet of feed line will usually fix that. Another possibility is a short or open, as you suggested. Ron AC7AC Thanks,Ron and all of those who replied for the good advice. I'm betting you're right on the money as far as feedline length. I'll put the antenna back up and check it with my dipper to see how it reads, and also with the rig in 'cal' (tuner bypass) mode. That'll tell me also if there's a short somewhere too. I tend to forget about the feedline length as I often just use an endfed wire from the KX1, or at home I use ladder line. I know this can still happen with ladder line, but perhaps less of an issue than coax.Besides, the ol' Johnson matchbox is pretty forgiving:) ___ 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: Does KX1 have CW spot?
Hi Alan and Don and all, Yes, it is not really a problem not having a CW spot button on the KX1. I am supposing that the narrow position of the filter is such that you probably can get within about 50 Hertz or so of the target. I realize now that the rig can't send an audio tone simutaneously with being in receive mode. I am not sure how the audio feedback works but I figured someone may have figured out how to activate a command and get audio feedback on the same frequency as the sidetone and use that to estimate proper pitch. It was just a thought. What I really need to do is borrow a KX1 and use it for awhile to get a feel for the rig. I think I can swing that locally. Thanks all for the input. Steve, W2MY -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.405 / Virus Database: 268.11.3/423 - Release Date: 8/18/2006 ___ 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] N2CQ QRP Contest Calendar: Aug 26 - Sep 25, 2006
~ N2CQ QRP CONTEST CALENDAR August 26 - September 25, 2006 ~ Hawaii QSO Party (CW/SSB/Digital) ... QRP Category Aug 26, 0700z to Aug 27, 2200z Rules: http://www.karc.us/hi_qso_party.html ~ Ohio QSO Party (CW/SSB) ... QRP Category Aug 26, 1600z to Aug 27, 0400z Rules: http://www.oqp.us/ ~ SLOVENIA CONTEST CLUB RTTY Championship .. 100W Category Aug 26, 1200z to Aug 27, 1159z Rules: http://lea.hamradio.si/~scc/rtty/htmlrules.htm ~ Colorado QRP Club Summer VHF/UHF QSO Party (CW/SSB/FM) Aug 27, 1600z to 2000z Rules: http://www.cqc.org/contests/index.htm ~ QRP BARBERSHOP QUARTET CONTEST (CW QRP)... QRP Contest! Aug 30, 9 PM to 11 PM EDT Rules: http://www.io.com/~n5fc/barbershop_contest.htm ~ Wake-Up! QRP Sprint (CW) *** QRP Contest *** Sep 02, 0400z to 0600z Rules: http://www.qrp.ru/sprint_e.htm ~ IARU Region 1 Fieldday (SSB)... QRP Category Sep 02, 1300z to Sep 03, 1300z Rules: http://www.sk3bg.se/contest/iarur1fd.htm ~ AGCW Straight Key Party (CW - 40 Meters) ... QRP Category Sep 02, 1300z to 1600z Rules: http://www.agcw.org/agcw-con/2006/Englisch/htp_e.htm ~ Michigan QRP Labor Day Sprint (CW) *** QRP CONTEST! *** Sep 04, 2300z to Sep 05, 0300z Rules: http://www.qsl.net/miqrpclub/contest.html ~ Adventure Radio Spartan Sprint (CW) *** QRP CONTEST! *** Sep 05, 0100z to 0300z (First Monday 9 PM EDT) Rules: http://www.arsqrp.com/ ~ FISTS G3ZQS Memorial Straight Key Contest ... QRP Category Sep 08, 2300z to Sep 10, 2300z Rules: http://www.fists.org/straightkey.html ~ Worked All Europe DX Contest (SSB) 100W Power Category Sep 09, z to Sep 10, 2400z Rules: http://www.darc.de/referate/dx/fedcw.htm ~ Swiss HTC QRP Sprint (CW) *** QRP Contest *** Sep 09, 1300z to 1900z Rules: http://www.htc.ch/de/htc_sprint_contest.htm or: http://www.sk3bg.se/contest/htcqrpsp.htm ~ ARRL September VHF QSO Party (All) Low Power Category Sep 09, 1800z to Sep 11, 0300z Rules: http://www.arrl.org/contests/calendar.html?year=2006 ~ Second Class Operator Club Marathon (CW) *** QRP Contest *** Sep 09, 1800z to 2400z Rules: http://www.qsl.net/soc/contests.htm#top ~ NA Sprint (CW)... QRP Category Sep 10, z to 0400z Rules: http://www.ncjweb.com/sprintrules.php ~ Tennessee QSO Party (SSB/CW/Dig) ... QRP Category Sep 10, 1800z to Sep 11, 0100z Rules: http://www.k4ro.net/tcg.html ~ End of Summer PSK31 Sprint *** QRP Contest *** Sep 10, 2000z to 2400z Rules: http://www.qrparci.org ~ FISTS: Get Your Feet Wet Weekend ... QRP Category Sep 15, z to Sep 18, z Rules: http://www.fists.org/getfeetwet.html ~ AGB NEMIGA Contest (80M CW/SSB) ... QRP Category Sept 15, 2100z to 2400z Rules: http://www.qsl.net/eu1eu/agb_nemiga.htm ~ PODXS 070 Club 80m Autumn Sprint (PSK31) ... QRP Category Sep 15, 2000 Local to 0200 Local Rules: http://podxs.com/html/070_club.html ~ Scandinavian Activity Contest (CW) ... QRP Category Sep 16, 1200z to Sep 17, 1200z Rules: http://www.sk3bg.se/contest/sacnsc.htm ~ South Carolina QSO Party (ALL) ... QRP Category Sep 16, 1300z to Sep 17, 2100z Rules: http://www.kf4ghc.net/ ~ QRP Afield (All) *** QRP Contest *** Sep 16, 1500z to 2100z Rules: http://www.qsl.net/wq1rp/ ~ Washington State Salmon Run (CW/SSB) ... QRP Category Sep 16, 1600z to Sep 17, 0700z Sep 17, 1600z to Sep 17, 2400z Rules: http://www.wwdxc.org/salmonrun/rules.htm ~ NA Sprint (SSB)... QRP Category Sep 17, z to 0400z Rules:
[Elecraft] K2 CW Tuning Indicators
Are tuning indicator kits for the K2 available? If so, who is making them? Thanks Roy Morris W4WFBNo virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.405 / Virus Database: 268.11.5/425 - Release Date: 8/22/2006 ___ 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] K2 CW Tuning Indicators
Hi Roy: I believe Ed Breneiser, WA3WSJ [EMAIL PROTECTED], still offers the complete kits. I still offer the boards (alone), $6 ppd stateside/$7 DX, and you provide your own parts. 73, Tom HammondN0SS At 11:09 AM 8/23/2006, you wrote: Are tuning indicator kits for the K2 available? If so, who is making them? Thanks Roy Morris W4WFB No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.405 / Virus Database: 268.11.5/425 - Release Date: 8/22/2006 ___ 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] k2 #4930 completed
hi all im happy to say that k2# 4930 is up and running the build went without a hitch everything is working ok this is my 3rd k2 options to be ordered soon /knb2 /k160rx /kat2 /k60xv / i gess i must be a elecraft junkie to bring on the amps and k3 73 chris g0wfh ___ 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] Another K2 Mod
Forget the K3! Forget the all the little nit-picky firmware mods...what the K2 needs is a BLACK PANEL That has to be worth another $100 at least! Doug W6JD ___ 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] Another K2 Mod
I remember back years ago , having a blank TT 509 front panel anodized black, guess I spent too many years in the consumer audio business. Then I learned to appreciate the old tt GREY ( INSTRUMENTATION) with a whole string of TT boxes... Titan / Herc/ 253/238/omni6, I like the K2 graphics right in between,.,,, Now see what the new ICOM receiver looks like . back to the hp type instrumentation gray like TT had.,.. even Bob Heils mics have gone all the way to RETRO what goes around... bill .what the K2 needs is a BLACK PANEL That has to be worth another $100 at least! ___ 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] TT Triton IV - How does it compare to the K2?
Any TT fans out there? How is the Triton IV receiver in terms of: - Receiver quietness - Recovered audio tone / quality - IF filtering (I know it is audio in the TT rig) I'm thinking it will be my next old rig to play with but wondered if anyone who has both a Triton and a K2 can comment on how they compare. - Keith KD1E - - K2 5411 - ___ 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] Another K2 Mod
On Wed, 23 Aug 2006 13:34:41 -0500, Bill NY9H wrote: Then I learned to appreciate the old tt GREY ( INSTRUMENTATION) with a whole string of TT boxes... Titan / Herc/ 253/238/omni6, Gee...my TT RX320D software-controlled receivers are plain black.three jacks (libe out, spkr out, 12V pwr in), a DB-9 connector and an on-off switch. No dials, no knobs, no pilot lights. Handy for putting on the top shelf of the bookcase behind all the manuals! -- 73 de K2ASP - Phil Kane Elecraft K2/100 5402 ___ 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] ALL BOATANCHORS ARE SPOKEN FOR
The response was overwhelming... In less than 24hr, all boatanchors were spoken for. I will respond individually to everyone who emailed me, but I just wanted to say Thanks right now, and to let you know you will be hearing from me later today. It was really gratifying to see how many are still interested in this part of Ham History. 73, ed - k9ew ___ 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: KX1 Sidetone--N0MF's Technique
Gentlemen, Steve... A CW sidetone IS available for matching to the received signal tone...and here's how it is done: 1) Enter the menu and rotate main tuning to StP (sidetone pitch). 2) Exit menu with two quick taps of menu button. Now, when you hold down(not just tap) the menu button you will get the sidetone at whatever pitch you have it set... and to exit/shut it off...simply tap menu key two times again. Of course, this has to be set up every time you shut off/ power up the rig...but hey...it's easy and works just FB for Fitzie (that be me)... Mike Fitzgibbon N0MF ___ 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: KX1 Sidetone--N0MF's Technique
Right, but it mutes the RX, which the K2 and K1 don't do. Leigh/WA5ZNU On Wed, 23 Aug 2006 1:09 pm, Mike Fitzgibbon wrote: A CW sidetone IS available for matching to the received signal tone...and here's how it is done: ___ 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: KX1 Sidetone--N0MF's Technique
Hi Fitzie and all, Great that's exactly what I was looking for. I think sometimes its good to hear the sidetone for a short burst to be confident that you've tuned in the signal correct. True, its not heard during receive, but I think it should be good enough. Steve, W2MY -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Fitzgibbon Sent: Wednesday, August 23, 2006 3:09 PM To: Elecraft list Subject: [Elecraft] RE: KX1 Sidetone--N0MF's Technique Gentlemen, Steve... A CW sidetone IS available for matching to the received signal tone...and here's how it is done: 1) Enter the menu and rotate main tuning to StP (sidetone pitch). 2) Exit menu with two quick taps of menu button. Now, when you hold down(not just tap) the menu button you will get the sidetone at whatever pitch you have it set... and to exit/shut it off...simply tap menu key two times again. Of course, this has to be set up every time you shut off/ power up the rig...but hey...it's easy and works just FB for Fitzie (that be me)... Mike Fitzgibbon N0MF -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.405 / Virus Database: 268.11.5/425 - Release Date: 8/22/2006 ___ 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] 2nd Generation Un-Module PCB Kits
I just received the Rework Eliminator Un-module kit and it went together smoothly, very good instructions. It should come in handy if I need to troubleshoot my K2 S/N 5622 73, Bob Johansen WB2SRF ___ 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] KX1 - Full power on internal battery
Greetings QRPers, I finally got around to doing something I've been pondering a while - installing a 12V battery inside my KX1 to allow for full power out rather than the much-reduced level available when using 6 internal AA cells. Description and a cheesy photo are here for those interested: http://www.ae5x.com/kx1.html John Harper AE5X Portable QRP: http://www.ae5x.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] KXAT1 with dipole
Guys, my money is on the connector on the feedline. It must have a short developed since the last time you used it. Or the short might be at the antenna feed point. The feed line length is just not a factor even when there is RF on the shield, and there is some. Sorry Karl-Ron had it exactly right.Feedline length is always a potential factor; I've run into it before and just forgot.Both with coax and ladder line sometimes you have to add or subtract a bit for impedance mismatch. You can look it up in the ARRL handbook In fact, you can even do a fair matching job with ladder line bypassing a tuner with the correct lengths.I added two feet of feedline and it loaded right up sweet as pie. I also should have realized it wasn't a shorted feedline as it still took some power and signal strengths were not hugely different as when there's nothing connected. -- Dan Presley-N7CQR-Portland, Or QRP-L #502 ARS #71 [EMAIL PROTECTED] ___ 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] KXAT1 with dipole
Dan Presley wrote: Guys, my money is on the connector on the feedline. It must have a short developed since the last time you used it. Or the short might be at the antenna feed point. The feed line length is just not a factor even when there is RF on the shield, and there is some. Sorry Karl-Ron had it exactly right.Feedline length is always a potential factor; I've run into it before and just forgot. I'm sorry Dan, I have no idea what was wrong because I'm not there. But to say you changed the feed line and then it tuned up fine is not to me correct. I am an Electrical Engineer and I studied feed lines and antenna design. I do things with a Smith Chart. If your dipole has an impedance of 72 ohms, which it really does at it's resonance frequency, then that impedance is what your feed line is seeing and it's characteristic impedance (RG-217) is 50 ohms. I plot both on my Smith Chart and look for a feed line length that will give a really bad low or high impedance at the transmitter end. I only need to look at the first half wavelength since it just repeats itself. I find the lowest impedance occurs at 240 degrees and is 28+j30. The highest is 120 -j12 at near a half wave. Now either of these should be possible for your tuner to tune. Your right the impedance changes between these values and if your very careful you can get close to 50 +j0. But why? Now in my house I have a 88 foot dipole fed in the center with 450 ohm windowed feed line of random electrical length. The SWR can get to 12:1 on some bands and the loss goes up to near 5%. I get out just fine and am Net Control for several nets on 80 and 40 meters. I am sorry but my experience and training make it hard to understand your results. 73 Karl K5DI PS: If you want the Smith Chart I can mail it to you. Both with coax and ladder line sometimes you have to add or subtract a bit for impedance mismatch. You can look it up in the ARRL handbook In fact, you can even do a fair matching job with ladder line bypassing a tuner with the correct lengths.I added two feet of feedline and it loaded right up sweet as pie. I also should have realized it wasn't a shorted feedline as it still took some power and signal strengths were not hugely different as when there's nothing connected. ___ 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] KXAT1 with dipole
I believe two points need to be made about this: First, if the SWR on the feedline was 1:1, changing the length of the feedline would have no effect. The conclusion is that the original SWR had to have been something other than 1:1. Secondly, the inductance and capacitance range of the KXAT1 is limited (3 inductors and 3 capacitors), the result of that is the impedance matching range decreases as the frequency is reduced. On 80 meters, the matching range is quite narrow, a bit better on 40, but on 30 and 20, the range becomes broader so that one can match most anything on 20 meters. 73, Don W3FPR -Original Message- Sorry Karl-Ron had it exactly right.Feedline length is always a potential factor; I've run into it before and just forgot.Both with coax and ladder line sometimes you have to add or subtract a bit for impedance mismatch. You can look it up in the ARRL handbook In fact, you can even do a fair matching job with ladder line bypassing a tuner with the correct lengths.I added two feet of feedline and it loaded right up sweet as pie. I also should have realized it wasn't a shorted feedline as it still took some power and signal strengths were not hugely different as when there's nothing connected. -- ___ 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: [QRP-L] Japan Ham Fair 2006 photos,
Hi, Folks. Some confirmation from Nobuki: -- Forwarded message -- From: THP info [EMAIL PROTECTED] Date: Aug 23, 2006 7:55 PM Subject: Re: HT-200 Question? To: Martin Gillen [EMAIL PROTECTED] Hello, Extracted specs are ; Freq. : 1.8 ~54MHz RX :0.5~54MHz Mode : SSB, CW, AM. FM DC : 13.8V TX 4A max RX1A max Size : 154w x 56 h x 175 d mm Wt :2.0kgs TX P.O. : 10W HF, 20W 6m RX : Double Conv. Superhet. IF : 45MHz, 2nd 455kHz AF : 1W We will disclose as we know more about teh new toy ! 73, Nobuki, JA1DJW - TOKYO HY-POWER LABS., INC. 1-1 Hatanaka 3chome, Niiza Saitama 352-0012 JAPAN Phone: 048-481-1211 FAX: 048-479-6949 e-mail : [EMAIL PROTECTED] Web: http://www.thp.co.jp - - Original Message - From: Martin Gillen [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Wednesday, August 23, 2006 12:00 AM Subject: HT-200 Question? Hi, I was hoping you could confirm something? I was quite excited to read about the new HT-200: http://www.onjapan.net/2006/hamfair/img_1960.jpg I do not read/write Japanese :) I read that: Current on Transmit = 5A. Current on Receive = 1A. Is this correct? Do you have an english translation of the HT-200 specification? Thanks, Martin. ___ 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] KXAT1 with dipole
Changing feedline length makes two important differences. One in the internal path length (which makes an impedance transformation) and one in the external path (if there is not an adequately effective balun at the feedpoint). The impedance of this outside path can vary over a considerable range, and depending on the impedance of the antenna this extra wire connected to the antenna can have a wide range of effects. Model your antenna as a simple vee with a source in the middle, and then attach a wire equal in length to the feedline and see how the current and impedance are disrupted. The extra wire (outside of the coax) is end loaded by the rig and whatever else is at that end of things, so it is hard to model precisely. The end loading will make the extra conductor much longer than actual length, and it may be strongly coupled to earth. -- Alan wb6zqz At 06:42 PM 8/23/2006, Don Wilhelm wrote: I believe two points need to be made about this: First, if the SWR on the feedline was 1:1, changing the length of the feedline would have no effect. The conclusion is that the original SWR had to have been something other than 1:1. Secondly, the inductance and capacitance range of the KXAT1 is limited (3 inductors and 3 capacitors), the result of that is the impedance matching range decreases as the frequency is reduced. On 80 meters, the matching range is quite narrow, a bit better on 40, but on 30 and 20, the range becomes broader so that one can match most anything on 20 meters. 73, Don W3FPR -Original Message- Sorry Karl-Ron had it exactly right.Feedline length is always a potential factor; I've run into it before and just forgot.Both with coax and ladder line sometimes you have to add or subtract a bit for impedance mismatch. You can look it up in the ARRL handbook In fact, you can even do a fair matching job with ladder line bypassing a tuner with the correct lengths.I added two feet of feedline and it loaded right up sweet as pie. I also should have realized it wasn't a shorted feedline as it still took some power and signal strengths were not hugely different as when there's nothing connected. ___ 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 price increase
Did the K2 just go from 599 to 629 $US, or do I need new glasses? -- To make a difference, one must first be different. ___ 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
