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LF: Re: Calculating ERP from measured field strength

from [Dick Rollema] [Permanent Link][Original]
To: "Reg Edwards" <[email protected]>, "LF-Group" <[email protected]>
Subject: LF: Re: Calculating ERP from measured field strength
From: "Dick Rollema" <[email protected]>
Date: Tue, 23 Jul 2002 16:13:34 +0200
In-reply-to: <006a01c230a9$17142e40$1c8901d5@kitchen>
References: <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
To Reg, G4FGQ and the LF-group

Reg, G4FGQ wrote:

Yes, I am aware of that.  But I am interested in the extent to which VLF
predicting capability of program GrndWav3 is affected by skywaves.  It would
be nice to state confidence limits on predicting error,  + or - dB or
something like that.

Any info is better than none. I have no means of making any measurements
myself.  So should some very inacurate data turn up it would be of
interest.
I would like to provide this data. But my problem is that in order to do a reliable measurement the signal has to be sufficiently over the local noise level. This means it must be about S6 or more. Signals you would like to be measured do not come up to that level.
But in order to find out whether a signal is affected by sky wave you could monitor the strong commercial stations adjacent to our LF band. When they vary in strength with time that is an indication there is a mix of ground and skywave.

73, Dick, PA0SE
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