I have an Alpha 89. Several months ago I noticed the SWR was fairly
high on one of the bands. I don't remember which one now. I had a
short jumper, maybe a couple of feet, between the rig and the amp.
I did some Googling and found reference to using a longer jumper. Then
I re-read the Alpha 89 manual and found in the installation part of the
manual the first step is "Connect a 50 ohm coax cable 60-72" long
(supplied) from the transceiver....." When I replaced the short cable
with a 6' cable all was well.
73, Alan N5NA
Kris Merschrod wrote:
Good evening, I am still fiddling and pondering the observations on this
problem. Gary's observation means that no matter the band the input
impedance is the same except for the "intervention" of the coax between the
exciter and the AMP. That is hard to believe, b/c my 8"jumper cable seems
to keep the 160, 80 and 20 meter input "happy" (No SWR) but on 40 it all
goes to "pot."
I can't believe that TT built non-matching rigs in the 1990s. Something
else has to be wrong.
Kris KM2KM
Merschrod
123 Warren Road
Ithaca, NY 14850
www.merschrod.net
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