[Lowfer] Re: Antenna Question

k2ors at comcast.net k2ors at comcast.net
Sat Nov 17 15:23:04 EST 2007


Mike,

>that it would be MUCH easier for me to install the Ashlock loop in the =
>horizontal plane rather than the typical vertical.

   Except that its the vertical sections that do the useful radiating.
At LF and VLF all signals are vertically polarized. The fact that the earth is a relatievly good conductor at these frequencies means that the ground would effectively 'short circuit' any horizontal electric field gradients.

See the excellent article by Adcock which I quote below:

http://www.lwca.org/library/lfprop/adcock/lfprop1.htm

"  Before going too far, it should be pointed out that all low frequency transmissions are vertically polarised only. In fact, it is almost impossible to radiate any horizontal component unless you are transmitting from an aeroplane. Radiation of vertical polarisation was referred to in an earlier article (Ref. 3). Some horizontal component can exist in the received signal, and this will be discussed later."


--
73 Warren K2ORS
WD2XGJ     136-140kHz
WD2XSH/23 505-510kHz
WE2XEB/2   160-189kHz
WE2XGR/1 505-515kHz

FN42hi
http://www.w4dex.com/wd2xgj.htm


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