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In Reply to: RE: Increasing output of acoustic revive rr-77 posted by eduardoo on October 03, 2015 at 22:40:00
I have not looked at all of the diy thread for a long time and I cannot recall clearly but I think there is a link to a clear drawing of how the antenna works, it is a kind of bifilar winding, the wire is folded in half and wound about a central point starting with the mid point of the wire so to make a large one you will require a very long length of very fine wire that you have to manage as you wind your flat pancake coil. Sorry but I don't have any photos of mine and I don't want to take them apart to take pictures. The first antenna I wound was on a piece of thin stiff cardboard a rectangle to fit into the case and I covered one side with double sided tape so the winding would stay in place when done I coated it with a few shots of spray paint to encapsulate the winding and insure it stayed in place. Good luck and best regards Moray James.
moray james
Follow Ups:
Noted with thanks.
One last question. So you just soldered that antenna (wires only) in parallel with the existing antenna with no additional parts required?
Thanks.
I wired both antenna in parallel correct and no I did not use any additional parts. Good luck have fun best regards Moray James.
moray james
Wouldn't replacement or supplementation of the built-in antenna cause a change in resonant frequency? Did you look for that? And wouldn't the benefit of a "larger" antenna (more coils) be more fully realized, if one were to upgrade the power capability of the preceding electronics that "drive" the antenna?Posted 10/15: Apparently the antenna plays no role in setting the frequency. So the answer to my first question is "no". The frequency of the emitted EM radiation is determined by the values of the inductance and capacitance that set it, upstream from the antenna, so far as I can tell from reading on the internet.
Edits: 10/15/15
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