I have to agree with Grant! My Orion has been RFI Free since I brought it
back from Sevierville after the hamfest. I use my old 705 mic, the one I
bought for my Omni VI Plus, it also has been used with my Pegasus, Jupiter
and now the Orion. I do not have extra grounding, caps or any other
modification in my Orion. I use the Ameritron ALS-600 Amplifier in the 500
to 600 watt output range. My antennas are GAP Verticals, one Challenger and
one Titan. These antennas are 75 feet to 127 feet away from my house.
I will post more about the Orion and RFI today, it is going to be in the
question and answer format. I am going to ask questions and will post how
my station is set up. You will have to answer as to how you set up your
station and think about the results.
Ken/w8keb
Flushing, Ohio
----- Original Message -----
From: "Grant Youngman" <nq5t@comcast.net>
To: <tentec@contesting.com>
Sent: Thursday, November 13, 2003 10:22 PM
Subject: Re: [TenTec] Orion and MIKEs
> > Also, there needs to be a 0.01 cap put across the mic audio hot pin to
> > pin#2 (ground) to help reduce RFI. One Orion owner even put a 0.01
> cap
> > from the PTT pin to ground.
>
>
> I run the legal limit, with the antennas quite close to the radio room,
and
> have never had any RF feedback problems, and haven't had to tack caps
> anywhere. The one problem I had was in an external piece of audio
> gear, but the radio has been consistently clean.
>
> It is not atypical to have the audio ground at a slightly different
potential
> than power ground. This has been the case in a couple of rice-flavored
> radios that have been in the shack from time to time. If the mic on the
> Orion is wired per directions, there should be no problem with RF getting
> in that route, and it should not be necessary to add anything.
>
> If RF really is getting in via an (unshielded) PTT line, then it seems to
me
> the problem most likely has a lot more to do with a dirty RF environment
> that could use some work than with the radio.
>
> Grant/NQ5T
>
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>
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