[TenTec] RF in Audio Mods for Jupiter

[Larry Menzel]

I agree, and I suspect you are suffering from some version of "common mode" 
rf interference.

I suggest:
1.  Make sure your coax does not run in close proximity to your AC lines in 
the shack if possible.
2.  Make sure if you have other runs of coaxial cable that they're not 
bundled together close to the radio.
3.  Do you have an antenna rotator?  Make sure that line is not running 
directly next to your coax.  A couple of turns on a large doughnut torroid 
on the rotator line can be very helpful in breaking common mode 
interference.
4.  Where your coax enters the shack, form a coaxial balun, about 6-8 turns 
on an 8" diameter and tape or tiewrap it in place.  This will help keep rf 
off your coax as well.
5.  Make sure your amp and all radios and power supplies are grounded with 
separate ground straps to a common tie point and thence to a good earth 
ground...not cold water pipes or electrical system ground.  Coax braid works 
great.

You should not have any difficulty running a kw with your Jupiter or any 
other radio for that matter.  I have two amps in the shack one on each 
Orion, and run them at 1500 watts out all the time during two radio contests 
without any rfi or rf in my radios.

Good luck.

Larry, N0XB
Northfield, MN


----- Original Message ----- 
From: "Jim" <pywacker at fuse.net>
To: "'Discussion of Ten-Tec Equipment'" <tentec at contesting.com>
Sent: Saturday, May 27, 2006 10:19 AM
Subject: Re: [TenTec] RF in Audio Mods for Jupiter


> For what it is worth I always find that I have to be more careful of
> grounding & ground loops and much pay more attention to shielding and 
> place
> several cores on cabling.
>
> Jim
>
>
> -----Original Message-----
> From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
> On Behalf Of Lyle Dunlap
> Sent: Saturday, May 27, 2006 8:50 AM
> To: n9vx at myway.com; Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] RF in Audio Mods for Jupiter
>
> To N9VX
>
> Are you sure its not your ant. system?  I had a Jup for a while ran it 
> into
> a KW with no RF problems.
>
> Lyle W9FCX
>
>
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