>When several UK stations used loop antennas, I noticed that they had
fading
>at much shorter distances than those using Marconis. This was at about
>300km, whereas Marconi users experience fading at about 500km.
Possibly due to lower output?
No, I really mean fading, not weaker signal. The fading was typically slow -
perhaps over 30-60 seconds.
>Since this type of fading is caused by interference between the sky wave
and ground
>wave, it suggests that the loops had a higher angle of radiation. Is this
a
>function of loops,
>or is it possible to steer the vertical angle by altering the feedpoint?
No. Unlike high frequency, so-called 'large loops' (due to the size/WL
ratio), low frequency loops are 'small loops' and have equal current
throughout. Therefore the location of the feedpoint does not effect the
wave
angle.
So, presumably my first theory is correct - loops have a higher angle of
radiation than Maconis.
Mike, G3XDV
http://www.lf.thersgb.net
====================
| 