On Mon, 5 Sep 2011 01:08:14 +0100
"James Moritz" <[email protected]> wrote:

> Dear John, LF Group,
> 

> This came up with field strengths at G3KEV of +7dBuV/m, and at
> G3XIZ/M0JXM of -12dBuV/m, so a 19dB reduction in signal level due to
> the extra distance over land 

Thanks Jim for quantifying the problem. That does make a compelling
argument as to why Mal hears me with ease in the daytime, and Chris et
al cannot. 

> So I guess a quiet location for GM4SLV's RX could  account for being
> able to receive the southern stations in Shetland, but not the other
> way round.
> 

Again, thanks for putting some figures on it, and I'm sure this
accounts for the non-reciprocal nature of the propagation.

The only thing will improve matters is for me to radiate higher ERP.
But to redress the balance - but it looks like 10dB or more would be
required. That's going to take some thinking about!

Thanks

John 
GM4SLV