[Top] [All Lists]

[RFI] rfi to computer via sound card

To: <rfi@contesting.com>
Subject: [RFI] rfi to computer via sound card
From: mgermino@inreach.com (Germino)
Date: Thu, 30 May 2002 18:19:13 -0700
Pete:  I use audio transformers to isolate my computer when I run psk31.
Build a cheap kit, it will probably solve your problem and you would have
another mode open to you.  Check out http://www.packetradio.com/psk31.htm
for wiring diagrams, ideas and kits.  Cheap kits, not fancy.


----- Original Message -----
From: "Pete Smith" <n4zr@contesting.com>
To: <rfi@contesting.com>
Sent: Thursday, May 30, 2002 1:39 PM
Subject: [RFI] rfi to computer via sound card

> I'm setting up to record contests using an SB-16 sound card and Recall Pro
> software.  At the moment I'm dealing with a severe RFI problem, which
> crashes the Recall software a few seconds into every transmission.  I've
> determined that it is definitely coming in the [line in] cable from my
> radio's external AF output, because when I disconnect that line from the
> computer the program doesn't crash no matter how long I transmit.  I've
> grounded the computer case and wound a number of turns of the [line in]
> cable around ferrite toroid cores, all without apparent benefit.  Would it
> make sense to try .01 disc caps bypassing the conductors in the [line in]
> cable to the shield, in case this is differential mode interference rather
> than common mode, as I'd assumed?
> 73, Pete N4ZR
> Check out the World HF
> Contest Station Database at
> www.pvrc.org
> _______________________________________________
> RFI mailing list
> RFI@contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi

<Prev in Thread] Current Thread [Next in Thread>