Dan, Would you please borrow an antenna analyzer from your friend and publish the impedance (both resistive and reactive components) of that antenna measured through both the 3 ft coax and the 25 foot coax. After having that data, perhaps we can give you an intelligent answer instead of mere guesses. I understand that the KX1 works nicely into a dummy load - we need to figure out how to help you with your antenna, but without measurements, that task is not possible.
73, Don W3FPR Daniel Paul Perez wrote: > My KX-1 has KXB3080, KXAT1, KXPD1 options. I am having trials and > tribulations with the KXAT1 tuning my KX-1. > > My configuration was Cobra Senior Ultralight up 60-66’ at one end 45-50’ > at the other with center up about 55-60’ | 81 feet of 450 ohm ladder > line runs that runs about 1’ foot through a casement window | Balun > Designs 4:1 4113t current balun | 3’ coax with 239 – 239 connectors > [703+] OR an amphenol 239/BNC adapter [KX-1]. > > In this config my Icom 703Plus tuned all bands and forward power was a > bit diminished. The Elecraft KX-1 would not tune 40M only. KX1 is > getting respectable power and swr on 80, 30 and 20 and 40 will throw a > high power value and r9.9. > > Getting some advice from this reflector (Thanks to Dale - WC7S in WY) > and the antenna manufacturer I then switched out the 3 foot coax with a > 25 foot coax between the balun and transceiver. > > In this config my Icom 703Plus tunes all bands at near SWR 1.0 and > forward power is exactly at what is set. The 703Plus works like a champ > and even better in this config. Now the Elecraft KX1 has high SWR r9.9 > on 80, 40, 30 and reads between r3-r5?? on 20M with respectable power > levels on all bands. I would have thought the KX1 to perform better as > well? Now the 703 is perfect and the KX1 is down on all 4 bands? > > Could someone help me understand why this might now be? > > I realize the KX1 tuner is smaller capacity than the Icom internal tuner > – but this antenna configuration is quite respectable. I read many > anecdotes of the sorts of “I threw a wire up in a tree with my KX1 and > it tunes and works lots and lots of countries.” This isn’t exactly > throwing a wire in a tree but a fairly standard antenna setup. Is there > not enough overall power from the KX1? > > I put a call into Elecraft before/at the holiday and they are getting an > answer for me on my previous question as to how to get the KX1 to send a > continuous wave when the KXAT1 is in bypass for the external tuner. It > appears to me that it sends dits or dahs when ATU is set to external > tuner ATU == CAL. I would try to study the situation more with the THP > HC200-AT autotuner but I’m unclear at the moment what the theory/design > is with the KXAT1 in bypass mode. > > I thank you for your advice and thoughts in advance. > > Dan > Ad1p > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.725 / Virus Database: 270.14.124/2598 - Release Date: 01/03/10 > 04:41:00 > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
