[Lf] Transmitting loops]

[Andre' Kesteloot]

"Ashlock,William" wrote:

> Due to a number of interesting transmitting loop discoveries over this week
> I have decided to fully shut down WA @185.200 for a about a week to give me
> time to figure out what is going on. I have constructed a 4'x4'x12 turn
> transmitting test loop that surprisingly appears to match the prevailing
> math for signal strength in the Lowfer band including area, current, and
> number of turns with no apparent ground losses. Although my single turn
> large loop has performed according to the math for a single turn, previous
> experiments last fall indicated a decrease in signal with increased number
> of turns. I am now thinking that this could have been due to inadequate
> spacing of the turns (proximity effect) rather than due an increase in
> currents induced in the ground. A couple of other discoveries with the test
> loop are:
> a) Far lower ground losses in terms of loop Q than originally assumed. I
> have obtained a Q of 360 with the lower leg only 8" above and parallel to
> the ground.
> b) A  3db stronger signal in the far field when the loop is located over a
> buried ground network rather than over bare ground.
>
> I would be interested in comparing notes with anyone that has experimented
> with multi-turn transmitting loops at or near the Lowfer band.
>
> Bill  WA
> Andover, MA