[amsat-bb] Re: RF Quiet my digital recorder

KM9U arskm9u at gmail.com
Fri Apr 15 16:58:28 PDT 2011

Have you tried it without the clip-on mic? I used an Olympus recorder for 
quite a while with no problems. I hooked the speaker output of the radio 
through a "Y" connecter directly to my recorder and headphones. The first 
set of headphones that I used were of the "noise blanking" variety and were 
battery powered. When I transmitted the rf would wreak havoc with them. I 
switched to another set of standard headphones and that eliminated the 

Chuck, KM9U

----- Original Message ----- 
From: "Bill W1PA" <w1pa at hotmail.com>
To: <AMSAT-BB at amsat.org>
Sent: Friday, April 15, 2011 17:19
Subject: [amsat-bb] RF Quiet my digital recorder

>I am using an Olympus digital audio recorder for logging LEO passes,
> because I can directly transfer a .wma to my PC from it (versus the
> tape recorder I used in the 90's).
> I am using an extension clip-on mic. I am finding that it generates a lot 
> of
> RF crud on 435, enough to swamp the RX if I am not careful.
> Beside a torroid on the mic cable, and maybe a foil/mesh cover over the
> recorder
> (maybe one of those new-fangled RF-ID protecting wallets),
> anything else I should try?
> Bill W1PA
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