Hi Edgar,
Thanks for the comment. Well, i thought there are no unwanted signal
sources in my garden, not in a radius of 400m. But maybe some HF stuff
reaches the gate through the air, or some charged humidity. Probably
you are right. And i can increase the C across drain-source by a factor
10. Next version... Hopefully there is good WX tomorrow.
73, Stefan
Am 06.10.2014 00:51, schrieb edgar:
Hi Stefan,
I suggest that you cover the LPF and FET with a piece of tin to stop
any external signals entering the circuit after the LPF.
A thin piece of metal from coffee tin or similar food container can be
bent in a U shape to cover the components and then soldered at a few
points to the copper ground plane.
Just leave a small clearance holes at the ends for the wires to pass
through.
Regards, Edgar
Moonah, Tasmania.
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