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[aprssig] Problems with hum on TX audio.

Ken Brown W2KB at comcast.net
Mon Feb 27 22:14:58 UTC 2006


I was getting TX hum about a year ago on the APRS dedicated rig.  Turned out
to be a failed power supply.  Switched it to the other supply that runs the
HF rig and it was fine.  The bad supply had a filter go bad.  Voltage was
fine so no obvious failure.

 

73, ---Ken W2KB

 

  _____  

From: aprssig-bounces at lists.tapr.org [mailto:aprssig-bounces at lists.tapr.org]
On Behalf Of Patrick Green
Sent: February 27, 2006 14:36
To: TAPR APRS Mailing List
Subject: Re: [aprssig] Problems with hum on TX audio.

 

Yes, that's now on the list to try.  Also going to put the radio and TNC
both on battery power since the hum is 60 hertz.

73 de Pat --- KA9SCF.

On 2/27/06, w0ep <w0ep at frii.com> wrote:



Is it possible to try the 2200 with the microphone, just to
key it up and see if you get the hum?  That might remove
the cable and/or TNC from the equation.






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