"Dave" wrote in message
...
Bruce wrote:
Paul Martin wrote:
There are very occasionally rain storms which are so heavy that
there's
no signal whatsoever that gets through them. I've experienced that
one.


And they will affect analogue just as much as digital. ;-)

No, less so. FM has the advantage in bad weather. It's called the
capture effect. In the absence of another FM signal, it is possible to
get intelligible info from a weak signal. Albeit, you get a poor
picture. With digital, it just packs up below a certain signal level.

Dave



Er, Dave, go read your theory book again. Capture effect has nothing at
all to do with the weather although it is a feature of FM.

Capture effect is the ability of a receiver to 'hear' one signal and
suppress the effects a co-channel signal, usually on a signal strength
basis. It's a long time since I did the theory, but as I remember it, if
a tuner had a capture effect ratio of 2dB then it would suppress a
signal that was 2dB lower in strength usually by around 30dB - well, in
theory at least. If there is no other signal present capture effect does
not come into the equation.

And if you don't believe me look at
http://www.radio-electronics.com/inf..._reception.php

And why does FM come into picture quality since, in the UK, the video
signal is AM?


--
Woody

harrogate three at ntlworld dot com