[Collins] 30L-1 switching

[Dr. Gerald N. Johnson, electrical engineer]

Harbach http://www.harbachelectronics.com/reference/harpg3cart.htm, the
HeathKitShop http://www.theheathkitshop.com/ampkeyer.html and others
make interface boxes for just such occasions.

If the exciter TX output was a positive 12 volts, I'd use a power MOSFET
as the switch. Something like a IRF-820 will handle a few amps at 800
volts. Put a 10K resistor from gate to source, drive the gate with the
12 volts. Connect the drain to the key input for the 30L-1. It wouldn't
hurt to wire a .01 disk ceramic from gate to source to be sure RF didn't
have any effect.

These links just happened to show up on the TenTec reflector the same
time this question was asked. They'd be handy if on the CRA web FAQ
pages.

73, Jerry, K0CQ, Technical Advisor to the CRA
-- 
Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.