I had an experimental antenna which exhibited this kind of
behavior. I could not send out my QTH data on PSK31 without
having the SWR go through the roof. My conclusion was that the
common mode choke, wound with parallel wires on a small type 41
core, was heating up enough to pass the curie point and lose
inductance and choking ability. I changed the feed arrangement
and the problem went away. Getting the old feed technique to
work is on the future projects list.
Cheers - Bill, AE6JV
On 3/31/14 at 10:02 AM, [email protected] (Gary Hawkins) wrote:
On my last two portable outings I've noticed that after a few
QSOs I start to get unstable SWR readings, with the radio
reporting fluctuating SWR ranging into the 2 and 3's. I'm
using a tuned antenna, plus pressing the ATU button results in
1:1 matching. Everything is fine for a while and then the SWR
reading go unstable midway through the QSO. Pressing the ATU
button seems to resolve the problem for a while but it starts
up again. I realize it could be a problem with the cabling or
antenna but visual inspection seems to indicate everything is
fine and so far I've not been able to replicate the problem on
the bench. Has anyone seen this type of problem with the KX3?
---------------------------------------------------------------------------
Bill Frantz | "I wish there was a knob on the TV to turn
up the
408-356-8506 | intelligence. There's a knob called
"brightness", but
www.pwpconsult.com | it doesn't work. -- Gallagher
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