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Title: receiving loop tuning Post by: ve6pg on June 10, 2012, 02:36:59 PM ..ok..i was wondering if any of you have sane thoughts, on the matter of tuning a coaxial loop antenna for peak. most of these things have the capacitor at the loop. that's ok for one spot in the spectrum, but when you tune away from there, the receive drops-off rather quickly.
so, what if the loop was tuned indoors, with a tuning network in the shack?..might the length of coax affect things?... ..tim.. ..sk.. Title: Re: receiving loop tuning Post by: Ed/KB1HYS on June 10, 2012, 03:00:05 PM better to put a small dc motor on the shaft of the tuning cap at the antenna. DC can be fed along the coax to retune the antenna as needed. A small battery powered screwdriver can be converted to do this and is ideal since it already has the fwd / rev capability.
Title: Re: receiving loop tuning Post by: ke7trp on June 10, 2012, 08:08:10 PM Rich has a remote kit that you might be able to buy or get a parts list to build. His loops are made for transmitting but the motor setup would work well. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
http://www.hlmagneticloopantennas.com/ I was going to try this $14 stepper motor controller with a cheap stepper motor to tune a cap outside on my antenna. Never got around to it. Search ebay for 170851588867 C |