How about replacing the speaker wire with shielded wire?
Art
W2NRA
> -----Original Message-----
> From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
> On Behalf Of Jason Buchanan
> Sent: Monday, December 15, 2003 3:27 PM
> To: dick.green@valley.net; tentec@contesting.com
> Subject: Re: [TenTec] Orion freezes due to RFI??
>
> Dick Green wrote:
>
> > I believe RFI succeptibility is a distinct possibility.
>
> I experienced RFI problems when using an external speaker with my
> Jupiter. The speaker wire is about 6 feet long - I resolved the problem
> by clamping a few ferrite snap-ons right before the speaker jack
> connector on the back of the radio. I ran the wire through the ferrites
> 3 or 4 times (depending on the size of the hole in the bead). They are
> about an inch apart. My RF problems went away after that.
>
> I have not experienced this problem using headphones and I also have a
> serial cable plugged in to the serial port (CAT purposes), also an audio
> cable from the accessory port to the input jack of my computer, keying
> loop RCA cables also. None of these seemed to change the RF problem,
> only by disconnecting the external speaker did I get any relief but the
> ferrite beads eliminated the problem.
>
>
> Regarding the beads, 2 turns won't do much, 3 is better, 4 is very nice.
> I have 4 beads in total. Problem eliminated.
>
>
> regards,
> Jason N1SU
>
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