tx power versus received signal
 

charles wrote:
In article ,
tony sayer wrote:
In article , charles
scribeth thus
In article , Brian Gaff
wrote:
Surely that depends also on the polar diagram of the transmitting
aerial as well. I also used to notice that there were wide variations
from day to ay even with outside aerials at UHF, as presumably, the
moisture content of the intervening air mattered much more at high
frequencies.
there was one genuine wideband aerial which worked absolutely perfectly
when it was dry, but was so tightly designed that it lost all the high
channels when it rained. Droplets of water collected on the ends of the
elements and detuned it.


Which one was that Charles?..

It was a long time ago - came on sale just as the Over Biddulph relay came
into service, when ever that was. Made by Jaybeam. I think it was the JBX5.

Some logs have element screws along the boom. If those logs are mounted
upside down a drop of water forms on the screwhead. Eventually an
hourglass shaped drop links the screw with the other boom. Result, no
signal at the terminals.

Bill

tx power versus received signal
 

In article , Brian Gaff
scribeth thus
Yes, I know, I know, but somehow, reception and the theory do not seem to
have a great correlation, probably due to real world stuff like buildings
and weather.
Brian


Well weather rarely affects reception that much but otherwise the theory
does stack up well Brian.

Buildings do as well and those aren't anything you can do much about....


--
Tony Sayer