From: "Mike Dennison" <mike.dennison@rsgb.org.uk>
To: rsgb_lf_group@blacksheep.org
Date: Mon, 17 Jan 2000 10:50:43 -0000
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Subject: Re: LF: PA0SE and DK8KW field strength observations combined
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DK8KW wrote:
> I have found Dick's (PA0SE) field strength measurements of last weekend
> very interesting. I have used Dick's observations, "normalized2 them to
> dBu (0 dBu=0.775 V at 75 Ohm, so simply substract 10 dB from a dBm(50) and
> you have got dBu(75)) and calculated the distances according to Dick's
> QTH-Locator. A combined grpah shows both our observations in one single
> plot.
>  http://www.qru.de/signals.html

This is a fascinating graph from which all sorts of things can be 
deduced.

One interesting thing is the "estimated 1W ERP line". I would have 
expected several stations to be very near (dare I say 'over') that line 
but most are a few dB below it. Doing a calculation on my own dot 
on Geri's graph (from Dick's measurement) suggests that my ERP is 
6dB less than I calculate from the current and effective height.

So, is there something wrong with the 1W ERP line or with our ERP 
calculations, or with the signal measurements? My money is on the 
1W line being too high, but perhaps Geri and others with bigger 
brains than me can come up with the answer.

Mike, G3XDV (IO91VT)
http://www.dennison.demon.co.uk/activity.htm