[Elecraft] KXPA100 160 ATU Issue

[Dick Dievendorff]

The ATU requires a certain amount of power so it can compare one SWR with another.  If there isn’t enough power, the ATU waits for it.

73 de Dick, K6KR

> On Dec 30, 2017, at 14:47, Dave Sublette <k4to.dave at gmail.com> wrote:
> 
> I'm helping my son, K4TOO do some antenna work.  The antenna is up and
> tunes on all bands with the KX3 on QRP.  When we put the amp in line, the
> amp ATU tunes all bands, except 160.  When we hit the ATU tune button on
> 160, there are no clicking sounds.  The SWR remains High and the power out
> is low, I suppose because the SWR is high and the SWR protection is
> shutting down the finals.
> 
> The Amp is a year old and has worked well until July.  It hasn't tuned 160
> since then. What I am trying to say is I think it is a problem with the
> amp, not the antenna.
> 
> I'm not sure how to proceed.  I'm away from all my tools, so I am somewhat
> limited in troubleshooting options.
> 
> Anyone have any suggestions?  Thanks.
> 
> Dave, K4TO
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