Larry, thanks mucho for the info! I printed it out, and will attempt to make a coil about 12 to 14 inches long, 4 inches diameter, out of about #10 buss wire.
Sounds doable! I have made them up to 6" diameter and about 15" long (160M bugcatcher coil).. The original design in the ARRL 65 handbook calls for a 3 inch coil of #14 for 250 watts of AM, and I can run up to 700 watts of carrier, so will go with #10 I think and make it 4 inches in diameter, although I expect a lot of cut and try. Sounds good for 160 through 20, if I remember the specs in the handbook about wire size and power.. Good ventilation will help.. The design calls for four coils on one form, the two inner coils 4 turn links, should I wind the coil then cut, or try making them separate from the start? The original design used B+W coil stock with 1/2 a turn unwound for the links... I think I would make the coil and then cut the wire, as suggested.. Making a long coil results in more uniform product all the way through. In my opinion, short coils are more difficult to deal with.. I may have to make the caps as well, they call for two dual 100pf caps at 4500 volts, plus a single 250 pf cap at 2000 volts, and I figure I should double the voltage ratings. Random thought: Ten-Tec makes and sells a variable capacitor kit, 500 pf @ 4KV.. Seems like you could modify one, as you build it, to produce the dual cap. And, modify the other to produce only the 250 pf that you need. I wonder if anyone has tried that. Of course, I would go hunting in the various hamfests. That is where I find most of mine. 73, Larry KQ4BY ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected]
