[UK-CONTEST] 160M band plan

[Cooper, Stewart]

Andy, if only they were running 400w. One station I know (not in UK) uses
the amp I use as a driver for the 'secret weapon in the basement'.
I remember once at the VHF convention's forum when someone in a big gun
group was asked, why do you run so much power? They replied, so you and
others with little aerials can hear us. True.
Good to see you on 160m.
Stewart
GM4AFF

-----Original Message-----
From: Andy swiffin [mailto:a.l.swiffin at dundee.ac.uk]
Sent: 02 March 2004 09:11
To: uk-contest at contesting.com
Subject: Re: [UK-CONTEST] 160M band plan



>Regarding the *alligators* (all mouth and no ears) a few live with
very 
>high QRN levels and genuinely can't hear - and then there is the 
>discrepancy in stations' ERP on this band - the big sigs are using
90ft 
>verticals with large radial mats and linears. The guy with his 
>feeder-strapped G5RV will hear the big signal but will respond with a
much 
>lower ERP. Hence the discrepancy. But of course there are some poor 
>operators, as on any band/contest.

There may be something I'm not totally understanding thats peculiar to
these LF bands (having just come from the oposite end of the spectrum
:-)

On UHF/VHF if I hear someone using 400W and we've both got aerials with
12dB gain over a dipole then if I call them with just 12W I'm only going
to be 15dB weaker (i.e. 2.5 S points) with them than they are with me. 
My 12dB gain aerial works just the same on receive as on transmit.

So, on LF, I'm hearing guys at s9 running say a KW and I call them with
say 60W  I'm generating  12dB less and so should be S7 with them,  yes? 
 OR is there some kind of non-reciprocity down here so that an aerial is
less efficient on transmit than on receive.  I know that radials are all
important (and I don't have enough yet although I'm busy sowing a good
crop of copper :-) but shouldn't the effect be the same on rx as on tx? 
And how about one way propogation - does that happen?   

soooo much to learn :-)


Cheers
Andy
gm8oeg



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