On Fri, 9 Oct 2009 22:23:20 -0500
Ed - K9EW <k9ew57@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
Ed W3NR
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