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Reg, G4FGQ wrote:
"The transmitter is OFF when I do it manually and I tune for maximum noise in the receiver." As Reg said, reciprocity rules. You can also satisfactotily tune an antenna to resonance by adjusting it for maximum output. When I was in Tierra del Fuego we had Land Rovers and boats equipped rith RCA single-sideband HF radios. The Rovers had whip antennas atop fiberglass boxes containing loading coils and motor-driven tap-changing switches. The coil base-loaded the whip. I routinely tuned the whips by switching my multimeter to the a-c range (it used germanium rectifiers) and tuning for a maximum meter indication. I chose meter-probe positions for a convenient scale indication. The above was accomplished with the transmitter ON and fed with a test tone driving it to put out some power. The whip was mostly non-directional so it made little difference where the r-f sensing antenna was placed. The tuning procedure worked fine even with the multimeter in the near-zone laying on the bonnet (hood) of the Rover. The capacitor tuning a high-Q loop could also be tuned for maximum output because that is your goal. The sampling antenna could be located almost anywhere but probably not in a null of the loop. Best regards, Richard Harrison, KB5WZI |
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