Re: [TenTec] RF

[Charles Greene <W1CG@QSL.NET>]

Hi,

I had an RF feedback problem with my Omni-VI+ for three years.  It just 
kept getting worse.  I tried all the usual fixes and some inside, like 
making sure all the internal plugs were tight, and adding a cap across the 
mike connector.  I used isolation transformers in the audio in and out, 
opti-isolators to key it, RFI chokes, all shielded wires.  Some helped, but 
it just wouln't go away.   It was worse at field day where I didn't have a 
good external ground.  It even got to the point where I was getting RF 
feedback while in CW.  I even thought the finals were oscillating.  It got 
so bad I couldn't operate any mode, so I sent it to the factory.  They 
fixed it, but wouldn't tell me what they did when I queried them.  I asked 
if it was a modification, and the technician I queried said it was.

:-(

Chas, W1CG

At 08:36 PM 9/10/2004, Jim Miller WB5OXQ wrote:
> I wonder if you have a grounding problem.  I run sstv using my omni6+
> connected to my pc and no problems even with the amplifier on running 500
> watts.  I use home a home brew keying device connected to a serial port on
> the pc with 1 transistor and 2 resistors to the key jack.  Never had any
> problems.  I have used a cw keyboard and psk32 using the same stuff with no
> problems even with the centurion driven near max output.  You must have rf
> floating in the shack somehow.  i do not have any kind of rf blocking
> devices on my cables either.
> ----- Original Message -----
> From: "George Allgood" <w4gfa@bellsouth.net>
> To: <TenTec@contesting.com>
> Sent: Friday, September 10, 2004 4:14 PM
> Subject: [TenTec] RF
>
>
> > I'm having RF attacks.  My OMNI VI+ with computer wired to the Key jack
> swamps when I strike a key on the keyboard.
> > The problem goes away if I reduce power on the OMNI to about one half.
> It's a problem trying to use contest programs
> > to key the rig.    Anyone have a source for high quality, shielded cables
> and connectors for this purpose?
> > I've placed  Ferrite cores on each end of the existing home brew cable,
> but no cigar.  Any suggestions would be most
> > welcome.
> > George W4GFA
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> >
> >
>
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