[Elecraft] [KX1] KX1 | KXAT1 ATU questions

[Don Wilhelm]

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
>
>
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