I'm going to agree, I've used the LA-1K from 10M-160M without
issue from the Amp (Non Amp issue stated below).? What is being
described is a possible feedline and or antenna issue.? My Elmer
also had a similar problem when power was applied, from his LA-1K,
and SWR went crazy. It ended up being the coax between the tuner
and amplifier that caused the issue.
My antenna is way short of 160Meters long, but use a wide range
ATU, and it acts the same way as you described, but it is my
antenna and not the amplifier. My work around is to use FT8
or CW to tune a specific frequency using 100Watts first, and then
introduce the amplifier at the lowest possible power, and stop
transmitting. Adjust C or L depending, and key up again and look
at the values until I get the SWR down to an acceptable level.?
Save those values in the ATU or write them down.
If not convinced it is not an AMP issue, then make or purchase an
antenna for that particular band, and see if the problem persists.
Best Regards,
On 1/25/2023 1:28 PM, Richard Osborne
wrote:
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Have you verified all of your coax connections to be acceptable?
?What antenna are you using? ?I am not an expert, but I have had
great luck with my LA-1K.
