The tuned input of the amplifier is what is causing the high SWR.
My guess is that your amplifier has a band switch tracking issue. In other
words, the input section is not tracking with the output section. OR there
is a defective component in the tuned input circuit for 160 meters and
possibly other bands.
Is the input SWR high on other bands?
You could call Alpha (or whatever they're called this week) and see what
they have to say about it.
----- Original Message -----
From: "James C. Hall, MD" <firstname.lastname@example.org>
Sent: Tuesday, February 03, 2004 7:46 PM
Subject: [TowerTalk] Help Please
> This is perhaps off topic, but I am hoping to gain some direction from you
> learned individuals for my particular problem. I didn't really know how to
> even title the subject. I guess the frustration levels are high !
> I am running a long Carolina Windom on 80M and 160M. It has been quite a
> performer for me - I need just AK for 160WAS. The setup is a FT-1000MP Mk
> feeding a Alpha amp. The SWR read by the meter on the Mark V as well as a
> Ten-Tec tuner after the amp is close to 1:1 on 1.825 MHz. But when I place
> the amp to operate, the SWR at the transceiver is >3:1, but the TT tuner
> still shows ~ 1.3:1. This amp, the 87A has tuned circuits for the input
> I attempted to reprogram this setting - but to no avail. I can't seem to
> the de-tune situation off of the transceiver.
> The antenna is a Radio Works long 160 windom. Similar detuning at the
> transciever is also noted on 80M but not as severe: without the amp,
> But with the amp, 2:1 at 3.525 MHz. One of my thoughts was possibly the
> balun at the antenna could be giving me trouble.
> I'm pretty confused over this. The upper bands with the beams do great and
> the only time I have the TT tuner engaged is with 12M and 17M.
> I've been meaning to get on with my shunt feed of my tower and at least my
> posts will be on topic.
> Thanks for anybody's help,
> 73, Jamie
> See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
> TowerTalk mailing list
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
TowerTalk mailing list