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.
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. 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 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. Fun with all thread and spacers, both metal and plastic, using my collection of end bits, plates, etc. The caps might be the hardest part of the deal... I have some big RF switches, a big chassis and front panel, etc, its just the huge coil and caps a high power balanced tuner needs that I have to make. Funds are tight right now, so I need to hold off doing anything but plans and rounding up of on hand parts, plus I need to buy wire to make the antenna with, new rope, make the open wire line (I got loads of wire and spacers). I also need to buy a table top drill press, I have been wanting one for a while, and the plastic for the coils. Thanks for the info! Brett N2DTS ______________________________________________________________ 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]
