I experienced the same problem with AM BC overload on the Orion I had. 160
and 80m were unusable due to a 50kw station about 15 miles away. I also use
a loop. In this case, an 80m loop. Using a tuner eliminated the problem but
I don't need a tuner with this antenna. I purchased the ICE BCI filter and
it did the trick. My Omni 6 is not affected by BCI even with no tuner and no
HP filter. Older TT rigs like the Omni C and Triton are totally rendered
useless without the tuner. Whatever secret the Omni VI has needs to be
carried over to the newer rigs. BTW: My TS-480 is totally clean in this
regard. It's got the best front end I've seen so far.
Steve Ellington
N4LQ@iglou.com
----- Original Message -----
From: <wq7x@cox.net>
To: <tentec@contesting.com>
Sent: Monday, May 23, 2005 12:46 PM
Subject: [TenTec] My new ORION
Thanks for quick response. Now I know that distortion of signals of
S9+35dB and above is known issue and hopefully
will be corrected in the new firmware.
I have another problem. With 2 el quad on 40m and having
50 kW AM station 7 miles from my house I'm getting IMD on my ORION on 40
and 80M band. Worst at 7250 ,S9 signal. No IMD on K2 or even TS930s.
40m quad loop looks like almost 1/4 wave for those AM stations with
probably higher impedance than 50 ohms, so the voltage at the antenna
could be very high.Attenuator doesn't improve because is implemented after
the two diodes D30 and D31 at the RX antenna input of the Orion. I think
that those diodes rectifying AM signal. This is easy eliminated if I use
external LP filter. No IMD.
Perhaps TenTec could improve that RX diode protection circuit and maybe
this would improve rather low IP2 of the ORION. Anybody there with the
same problem.
Anybody in Phoenix would like to bring his ORION to my house,so we can
compare.
Thanks, Mark WQ7X
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