Hi Alan & LF,
You (Alan G3NYK) wrote :-
"It might be worth sticking a big 50 volt zener across the power unit
to clip any transients."
That sounds worth a try.
And
"What sort of PSU is it ??"
It is a simple affair using a big toriod transformer, 40V x 40V at 6.3A
500VA with windings in parallel smoothed by 2 x 10,000MFD 100V capacitors
(voltage is about 45V before going to transmit state) & a smaller toroid to
supply about 28V DC to 24V & 12V 3 leg IC regulators within the transmitter.
I am only using the variac at present because I wanted to bring it up gently
until I was sure that all is well, I will need to fit some sort of soft
start when I am happy with it & know I can run it at max volts, I can then
remove the variac.
Thanks for your feedback.
Regards,
Gary - G4WGT - IO83qp
Web : http://myweb.tiscali.co.uk/wgtaylor
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