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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