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Hi Jack,
See if you can find a project called "A 75 to 120 Watt CW transmitter" in any of your ARRL manuals, (1973 ?). Z1 is the APC, RFC4 is the anode RFC, there is a 10R grid stopper on G1 (pin 5), Decoupling abounds (including the heaters), band switch shorts unused turns of the output inductor, top chassis shows anode wiring only, bottom chassis shows grid and drive electronics. I haven't read the whole article yet, but it seems like a well designed beastie and a good starting point. Keep a change of fresh underwear next to the rubber gloves ![]() Regards, Mark On May 24, 12:26 pm, Jack Schmidling wrote: MarkAren wrote: Grid stoppers: A low value resistor (100 ohms) attached directly between G2 and the screen supply to reduce the incidental Q of circuit. OK but the supply is a 12K resistor from the plate supply. Guess I don't see what a 100 in series with this would do. Same applies to G1. Where does that go? There is a 47K grid leak going through the meter to ground and a coupling cap from the driver. So what is this grid stopper supposed to do? APC - Anti Parasitic Choke. Roger. The A caused a brain cramp. I have one in there. Get a 1960s copy of the ARRL handbook and read up on HF amplifier construction techniques. There has been plenty written. I have 49, 57, 61 and 73 one of which I take to bed with me every night. js -- PHOTO OF THE WEEK:http://schmidling.com/pow.htm Astronomy, Beer, Cheese, Fiber,Gems, Sausage,Silverhttp://schmidling.com |
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