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From: "Laurence KL1X" <hellozerohellozero@hotmail.com>
To: rsgb_lf_group@blacksheep.org
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Date: Fri, 27 Apr 2007 04:08:10 -0800
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Subject: LF: volts/meter?
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Does anyone have a prog that can "back track" field strength in say u/V into 
50 ohms for ground wave inputting ground conductivity, freq etc with 
distance?


Im trying to work out at 137Khz the following - on a quiet day light path, 
say noise at -110dbm or better into 50ohms, summer time conditions, Im 
receiving  (did receive) wd2xdw in southern texas (Utopia W of San Antonio) 
at circa 500 miles at >-108 dBm - Actually I could read just the CW ID at 
this distance -


Can we track back from the received level with any certainly +- say 3dB  the 
associated ERP of the transmitting station at that distance given the 
received signal strength from a say uncalibrated receive antennae knowing 
just that at F Khz its likely the receive quiet day noise level is unlikely 
to be above N -dBm - and the rx sensitivity will always be better than that?

I know there are tons of variability, and many dBs of variables involved in 
the path losses associated with the ground conductivity..

I notice using the USA conductivity map that XDW did a lot better than I 
expected in the directions associated with improved ground condiuctivity - 
no real suprises there but it was many dBs higher than I would have thought.

Singapore -

The good news here is that it looks like we have secured a top floor 
"penthouse" apartment- 4 floors up with space for external antennae and 
permission from the owner to run the radio station. Open to most directions 
:-))

CHeers

Laurence 9V1 Singapore

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