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In Reply to: RE: Increasing output of acoustic revive rr-77 posted by eduardoo on September 29, 2015 at 01:42:55
I have wound larger antenna for a number of different such units while I have no way to measure I was pleased with the results. I also connected larger antenna in parallel to smaller ones for similar results. Bit of a fuss to make but if you have good dexterity and a tacky base to wind upon it works well.
moray james
Follow Ups:
Thanks, Moray.
That sounds like fun. Would you mind sharing some pics and instructions if how you did it? Do they still fit in the box, or did you fit them externally?
Thanks.
don't have a camera that works. I simply used 28 gage for one and 30 gage =for two others wound them as the factory winding is. Because I used such fine gage wire the antenna is much larger (has more windings) than the original and yes all the ones that I did all fit inside of the stock cases the smallest one was a pocket size portable unit. Hope that helps. Best regards Moray James.
moray james
Thanks.
So, any insulated wire would work, and I need not be precise about the winding? Theoretically, Would just connecting a roll of thin gauge wires work then? Any issues with loading the circuit with the extra antenna?Thanks.
Edits: 10/03/15
If you want to build a larger antenna that will fit into the same physical volume you will have to uses smaller wire and if you want a much larger antenna you will need to use much smaller wire. You need to look at the antenna inside your unit you have not done so perhaps if you look up some information on the type of flat winding this is. Here is a link you can do some reading up. http://www.diyaudio.com/forums/everything-else/162477-diy-schumann-resonator.html
moray james
Thanks. I looked into that thread before. Lots of good info, but not a lot of illustration and clear instructions. If you can one day find a pic of yours that you can upload, that would be most lovely.
Thanks.
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
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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