Re: LF: Loop TX antennas at VLF?

[John Andrews <w1tag@charter.net>]

Alan,

Yes, you could split the series cap -- assuming that the values were 
close, the balance would be excellent. Given an audio amp with a bridged 
output configuration, and the matching network set up for 10-12 Ohms or 
so, you'd be all set. As Steve points out, variable caps are a problem 
at 9 kHz, and you'd be compounding it a bit by trying to keep the symmetry.
But if you use a transformer to couple to a coax or other line, you can 
use any tuning/matching setup, and the balance to ground will be OK.
John, W1TAG

On 3/21/2011 10:13 AM, Alan Melia wrote:
> Hi John that is a good point, balanced is always better . I had wondered
> whether the cap in series with the loop could be split into two parts to
> retain the balance. The article is in the blue backed  "Source book" and is
> called High Power Matching at VLF by G3OKA ..........split C1 into two parts
> ?? This was originally intended for driving a73kHz loop from an 8ohm audio
> amp.