I would like to find out more about the Raven LRL like where on the dial is it set for gold? Carl said he hooked up a speaker so he could probably get a good estimate of the frequency from a nearby radio station. If I went by the markings for GOLD on the case at 27.5 and assume this is a percentage on the dial range I could probably get in the general area, but I don't even know if it is from the top of the scale or from the bottom and for that matter even what scale they are using. The old ones went to 1620 and the new ones are 1700KHz.
I plan to use an MFD-type frequency generator, tune the antenna and walk through the signal line like with a set of L-rods just to see if I can feel anything. If I carry an AM radio it can at least help to point out areas of electrical interference, etc. and maybe even be able to work around it from the right direction. As it is now with a set of L-rods the user is basically working blind as far as interference is concerned. So maybe this set-up can help to "see" the area better.
I've heard of oldtimers using a crystal radio to locate mineral veins. I guess they could hear a popping noise in the headphones (piezoelectric activity?). So this is another option I will check out. BTW, be careful as this popping can damage your hearing. Another option is to hook up an amplifier with filters, etc.
Will any of this work? I really think it should help. As for the induction loop to a signal strength meter or even to the L-rods, maybe these do not even need to be connected, just close to the person's hands. I know I can feel some kind of capacitive change when I put my hands near the capacitor. It feels like a cool breeze, like a bumble bee.
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