ANTENTOP- 01- 2014 # 018

Pocket Antenna Tuner

Parts List

C1: Variable Capacitor 12/495- pF from old tube receiver.

C2- C12: Ceramic Capacitors, 250- V

S1: Toggle Switch.

S2, S3: Small Rotary Switch for 11- position.

L1: Coiled on to plastic ring (from plastic water-pipe tube) in diameter 20- mm and height 8- mm. Contains 15 turns, tap from the middle. It was used wire in diameter 1.5- mm (15- AWG).

L2: Coiled on to plastic ring (from plastic water-pipe tube) in diameter 20- mm and height 40- mm. Contains 32 turns, tap made from each forth turn. It was used wire in diameter 0.8- mm (20- AWG).

Antenna matching very conveniently may be made in receiving mode. At first, Switch S3 installed at Position 1 (Coupling Capacitor C2). Then with help of C1 and S2 tune tank resonator to resonance (on maxima receiving signals). After that find optimal antenna coupling by S3 and consistently tuning C1 and may be switching S2. May be in transmitting mode the tuner would be need some small tuning on minimal SWR.

73! UN7CI

Credit Line for the Article:

www.cqham.ru

www.antentop.org

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