Propeller Head Plaza

Technical and scientific discussion of amps, cables and other topics.

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RE: The antenna

Posted by rick_m on May 14, 2015 at 08:33:02:

The best antenna is just a loop and it doesn't have to be very big. I'll attach a picture of one rather than go the thousand word bit. (the major squares are 1")

You can calculate the B field using the Biot-Savert law but the upshot is that the field strength is proportional to the area and the ampere-turns.

I played around with this several years ago and found that a smallish loop hooked to a Fn generator produced a noticible effect >10' away. But it wasn't a good effect, more of a woozy one. So I changed the frequency slightly and the woozyness cleared up.

Now my field strength was probably considerably greater than the commercial units. The antennas of the two that were pictured on-line were garbage. The spiral one has almost no effective aperture for most of the turns, they could have stopped at the eight outer ones. The other was, to the best of my recollection a wadge of wire wadded up and stuffed in a box. Garbage basically.

My take-away from my dinking is two-fold:

1. I suspect that needed to lock my local source to the current Schumann frequency but I couldn't think of an easy way to accomplish it.

2. The local field really seemed to have an affect but depending on the frequency (at least) perhaps not always beneficial.

It's really rather an interesting affair. The engineering is easy but the target pretty important and personal so it may not be the safest thing in the world to dink with.

Regards, Rick