loops and radiation angle

[André Kesteloot]

Mike Dennison wrote:

> G4GVC wrote:
> > What was most striking about Steve's (GW4ALG) signal was the variation in
> > strength - there was always pronounced QSB, but he went from RST-339 on the
> > 15 watt beacon, through 559/569 during the weekend to a maximum of 579 when
> > we worked on Friday afternoon!
> >
>
> This is extremely interesting. As some may remember, I received
> Roger, G2AJV, last Easter in when I was in Pembrokeshire and he had
> very deep QSB. The theorists suggested that this was very unlikely at
> that range on these frequencies.
>
> What is even more interesting is that both Roger and Steve use loops.
> This suggests to me that if you want high angle radiation - and
> remember that ionospheric ducting has a low loss at LF - an efficient
> loop may be the answer. From my own experience, the problem is the
> huge currents involved relative to Marconis. Certainly some scope
> here for lateral thinking to get high angle radiation without either
> ground loss or wire loss.
>
> Mike, G3XDV (IO91VT)
> http://www.dennison.demon.co.uk/activity.htm