Keith: I just fired up my OII on 160 m AM and did not get the problem you
described, so it sounds like something else is going on there. I agree with
one of the other posters that you should run AM on 160 into a dummy load and
see if that triggers the problem. If not, then RF is a good place to start.
If it's not RF, perhaps you should reload the firmware from your computer.
Please note that you will always hear some distortion in the monitor on AM,
but this does not come out on the air. Tests I have made with a Perseus SDR
receiver indicate that AM in the OII nothing short of excellent with audio
response > 5 kHz and no audible distortion. Levels adjust automatically so
there is no splatter over a very wide range of input levels.
Ron N6IE
www.N6IE.com
----- Original Message -----
From: <ac9s@mchsi.com>
To: <tentec@contesting.com>
Sent: Tuesday, January 13, 2009 12:56 PM
Subject: [TenTec] Ten Tec OII - SSB Distortion
As originally reported, I have been experiencing really distorted SSB
with my OII for the last 3 - 4 weeks - after receiving glowing reports
for the last 2 years. I have partially 'cured it', but don't have the
root cause nailed yet. A master reset will restore the radio to its
excellent state, but it appears my problem reappears after checking into
a 160 meter AM net we have locally on Sunday mornings. 160 Meter AM
operation is always distorted and once I have operated 160 I then have
the problem on all other bands with SSB. A master reset now gets me back
in operation, but I don't know what is triggering the problem. This
Sunday I used my 756Pro and received excellent audio reports on the net.
I switched to the Orion and had the distorted report. Asked the guys to
switch mode, did a master reset and had excellent audio reports on SSB,
which I then validated on 40 and 20.. So - it looks like AM operation on
160. Maybe There is enough RF floating around the shack
on 160 o scramble its little brain, but I have always thought the Pro more
succeptable to RF than the O2 and I don't have any evidence of RF in the
shack.
Does this trigger any thoughts? I can work around the problem, but
clearly something is wrong.
Thanks --
Keith
AC9S
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