archiv~1: Re: SETI Multipath

Re: SETI Multipath

David Woolley ( david@djwhome.demon.co.uk )
Sat, 21 Nov 1998 13:58:38 +0000 (GMT)

> Although its not quite the same thing as short term fading, short wave
> broadcast stations transmit on many bands simultaneously to ensure that
> at least one will get through to its audience (which is not to say that
> you couldn't design a frequency diversity system, only that it would
> be overengineering for domestic use).

I'm afraid I dropped a few steps here. What I was saying is that shortwave
broadcast transmitters have the characteristics of a frequency diversity
system, but domestic receivers don't work in the way that a professional
frequency diversity receiver would operate, in that they require manual
retuning, which tends only to be done for slow variations, not to find
the current peak of the fading cycle.