Tip & How-To about Radio Communications
Get you a metal box about 4 inches X 4 inches. Use 2 female Cb antenna inputs from old Cb radios or Radio Shack. Get a old Am radio tuner out of a AM radio(530-1700 khz.) Buy or scrap up some copper wire; big gauge I used. Wound 8-10 turns about " 1 inch round close tight wound. Solder to AM tuner- C1 it shall say on top of Am tuner. Solder Center of Am tuner to Ground(Metal box). For those who know electronics the Tuner is 0-365pf Am band 530-1700khz types. OK, back to assembly. drill a hole for the Two Female Cb Inputs on both sides of metal box. Attach copper wire inside to center taps of Inputs on both sides. Drill a hole for Am tuner and Screw on its lock nut and place a knob on it. Solder all grounds of Female Antenna inputs and Tuner Ground and all Grounds to metal box. Use a washer and Bolt to lock down Grounds to Box. This is how it operates after you use a Jumper to hook to TX of Cb radio. Antenna to other side. Its just a simple L/C network. The Tx travels through copper wire(coil) inside box and gets shunted to ground by the right level of PF Capacitance. The operator tunes it in to get a close to 1.1 to 1.5 SWR ratio. Its simple, but helps with bad Antennas.
Posted by Steve... on
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