"rickman" wrote in message
...
I have a project in mind that would need a very good antenna in the
frequency range of 60 kHz. Originally I looked at loop antennas and liked
the idea of a large shielded loop made of coax tuned with a capacitor. My
goal is to get as large a signal as possible from the antenna and matching
circuit to allow the use of a receiver with very low sensitivity... in fact
an all digital receiver.

I spent some time simulating antennas in spice and was able to get a bit
of a feel for the circuit, but I'm not convinced it would work the way I
want. Just before I set the project aside I was told I needed to model
the radiation resistance. That has the potential of wrecking the Q of the
circuit. I am counting on the high Q to boost the output voltage. If the
radiation resistance is at all appreciable I would lose the high Q and
need to start over.


I don't think I would try and reinvent that type of antenna. There are
several designs on the web that use a loop about 3 feet in diameter and
several turns of wire inside the shield. In most cases a low noise preamp
is needed, but that shold be simpleand inexpensive to build.

Go to this page and go toward the bottom for some loop antenna ideas.
http://www.w4dex.com/lf.htm

I have known Dexter for around 40 years.




---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com