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LF: WSPR problems

from [Chris Osborn] [Permanent Link][Original]
To: LF Group <[email protected]>
Subject: LF: WSPR problems
From: Chris Osborn <[email protected]>
Date: Sat, 17 Jun 2017 12:20:10 +0100
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GA LF,

I have a recurring problem with my home made LF WSPR TX  :-

As the PC's audio signal shuts down (after the nominal 2 minute  transmission time) it picks up RF  -  this is fed back to the TX input causing several seconds of instability.

Has anyone else had this trouble and/or knows of a simple solution?

I've tried putting ferrite rings around the PC's input and output cables which solved the problem for a while.

In desperation I'm considering adding a monostable to ground the TX input for a few seconds after the PC's AF shuts down, but this will be a last resort.

Any useful advice or comments would be most welcome.

73
Chris (G3XIZ)
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