[TenTec] Argonaut 509 sidetone "pop"

Ed autek at comcast.net
Sat Oct 10 04:29:48 PDT 2009

On Fri, 9 Oct 2009 22:23:20 -0500
Ed - K9EW <k9ew57 at gmail.com> wrote:

> Hi Gil,
> Yes, the T/R switching line in the 509 really wants to see a good
> solid ground for proper operation.  I've had to try various keyer
> output transistors to get decent operation.  No problem with a manual
> key.
> I have heard of others with the same or similar problems, and the
> solution always seems to point to getting a very low voltage drop to
> ground for proper operation of the T/R line.  So I would suggest
> trying different transistors in the output of your keyer.
> Let us know what you find.
> 73,
> ed - k9ew
> www.k9ew.us

I ended up using a reed relay on my 509. HTH


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