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ANTENTOP- 01- 2014 # 018

Pocket Antenna Tuner

 

 

Antenna and transmitter sockets (to decrease the sizes of the box) did not use at the design. SWR- meter (or RF- Meter) as well did not used here for the reason. Variable tank capacitor had simple inbuilt vernier 1:3. The tuner could match antenna impedance up to 300-Ohm. Limitation is only to working voltage of the row capacitors and input variable capacitor. Figure 2 shows (for reference) schematic of the Lew McCoy’s “Ultimate Transmatch.”

Note from I.G.: The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24). The circuit was very popular that it was also published in several of the ARRL Handbook from the 1970s. I have seen one “Real McCoy Transmatch” (as a seller sad to me) at one of Ontario Hamfests. When I decided if I heed to buy this one or not, another person bought it.

Figure 2 “Ultimate Transmatch by Lew McCoy, W1ICP

 

 

Simple broadband transformer, connected to the tuner, allows use the tuner with symmetrical antennas fed through ladder line and with generation of the wire antennas. The transformer provides 1:4 and 1:9 transformation ratio.

Figure 3 Broadband Transformer

 

Lew McCoy, W1ICP

 

Figure 3 shows schematic of the transformer. Transformer is wound on to ferrite ring in 30- mm OD and permeability 20 by triple wires in diameter 1- mm (18-AWG) in Teflon insulation. Pictures show design of the tuner.

 

 

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May 1, 2016 22:43

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