[UK-CONTEST] Dedicated RX Antenna, Isolation?

Dave Lawley g4buo at compuserve.com
Fri Apr 6 04:49:24 EDT 2007


> I've come across a couple of RX front end protection ccts consisting
> of a series lamp and back to back shunt diodes to limit the pickup to
> a safe level.

That's what I use, 60mA 'grain of wheat' bulb, 33ohm resistor and .01uF 
capacitor in series and two strings of four 1N914s back to back. When I 
have a short beverage in the garden, it goes *between* two of the 
elements of the 4-sq and the lamp lights on 40m, but all is well never 
blown a lamp nor, more importantly, the front end of the MP.

Dave G4BUO




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