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Re: RFI problem



You might want to consider shielding the inside of the speaker box with foil 
tape, and grounding.

Can't hurt...

73, Scott


----- Original Message ----- 
From: "Steve" <ai7w@comcast.net>
To: "'amsat-bb'" <amsat-bb@amsat.org>
Sent: Friday, January 28, 2005 2:11 PM
Subject: RE: [amsat-bb] RFI problem


> >The Klipsch speakers are not cheap.  Mine are the
>  >THX certified ones and run $199 new.  If you
>  >neighbor is audio or gaming buff he may go
>  >for this option.
>  >
>  >-Freeman
>
> Thanks Freeman. I think the Klipsch speakers will be too expensive for his 
> budget. He’s a family man with 4 kids. But if I can’t find something less 
> expensive, maybe I’ll offer to split the cost with him.
>
>  >The RF might be affecting the sound card itself,
>  >not the speakers, and any ferrite beads in the
>  >speaker cable will not do any good.
>
>  >BTW, ferrite beads may not make the best choke
>  >at 144 MHz; they are better for HF. You may have
>  >better results using a powered iron core specified
>  >for 144 MHz. Try winding the cable like a toroidal
>  >inductor, not just passing it through the core
>  >(you will need a large diameter core for that).
>  >
>  >Good luck,
>  >
>  >Marc N2UO
>
> Thanks Marc. I’m sure the problem is the speakers (happens when they are 
> unplugged). The cores I used are designed for VHF (they were for PC 
> monitor cables) they are probably powdered iron but I don't actually know. 
> I did wrap the cables in the cores. I managed 4 turns.
> If I can't find some speakers that work out of the box and if I can get 
> him to let me have the speakers for a week or so, maybe I can try some 
> different types and see what works.
>
>
>  >Give him yours.... ;-)
>  >
>  >Roger
>  >WA1KAT
>
> Thanks Roger. I would but mine aren’t amplified and don’t have a ‘sub 
> woofer’.
>
> Steve .. AI7W
> LM #2270
> ----
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----
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