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
On Thu, Oct 8, 2009 at 5:22 PM, g p <n2wjw@yahoo.com> wrote:
> My 509 makes a "pop" everytime I key either a dot or a dash and it happens
> only with an electronic keyer and not with a key or a bug and the pop happens
> with any electronic keyer I have tried.
>
> Is there a mod to fix this? Any help appreciated.
>
> Gil
>
>
>
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