[RFI] Sound Card

[Cortland Richmond]

Some decades ago, when I was testing computers, accessories, and third-party line cards at Tandy, I discovered that some of them  transferred digital noise from inside directly out onto external devices, or made their own; a few monitors screamed like a banshee because the CRT return for video was a just one wire from the CRT 's iron mask to the video driver,  and a  television line card tuner, while quiet enough when it was displaying a TV signal on a store-brand monitor, was itself noisier than a brass band on steroids when it wasn't delivering video of its own. THAT, thank goodness, isn't a problem now. But you can never be sure.

Broadcast studio devices can cost quite a bit more than cheap Chinese ones but we should remember what Julius Caesar said about buying things at the neighborhood Coliseum:  "Caveat Emptor", or the like.  Back in the days when we could try things out in the store, I would carry a wideband scanner or 2m – 440 handy talkie with similar HF-VHF coverage or more, and test what I bought before I took it home.


Cortland


-----Original Message-----
>From: Joe <nss at mwt.net>
>Sent: Sep 15, 2020 7:45 PM
>To: rfi at contesting.com
>Subject: [RFI] Sound Card
>
>For my playing of wav files for contesting I am going to dedicate a nice 
>small USB type sound card ya know looks like a thumb drive?
>
>Now in thinking of RF issues of RF getting into it. Where would be the 
>best placement of it to lessen the possibilities of RF getting into it?
>
>Having it right at the computer, and run the AUDIO cable long enough to 
>reach the radio.
>
>OR
>
>Have it right at the radio, and run a USB extension cord to the computer.
>
>What is less prone to have RF Issues?
>
>Joe WB9SBD
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