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LF: Re: Calculating ERP from measured field strength

from [Dick Rollema] [Permanent Link][Original]
To: "Reg Edwards" <[email protected]>
Subject: LF: Re: Calculating ERP from measured field strength
From: "Dick Rollema" <[email protected]>
Date: Sun, 21 Jul 2002 10:04:51 +0200
Cc: "LF-Group" <[email protected]>, "Dick Rollema" <[email protected]>, "Jan Harte" <[email protected]>, "Jaap Kroon, PA0IF" <[email protected]>, "Klaas Robers, PA0KLS" <[email protected]>
In-reply-to: <000f01c22fed$5b513b00$118301d5@kitchen>
References: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
To All from PA0SE

Reg Edwards, G4FGQ, wrote:


I have just checked the source code in program GrndWav3.  It does make use
of CCIR curves and data for refraction over the horizon although I have had
to use some intelligent guesswork to extend to 30 MHz.  It's good to be
reassured I havn't introduced any bugs.

CCIR Recommendation 368-7 contains curves for frequencies from 10kHz up to and including 30MHz.


When available I would be pleased to have some figures of 500 to 2000 km
propagation.

There are indications that at distances over 1000km or so even at daytime some sky wave may be present, disturbing the measurement. The sky wave will be weak of course, but so will be the ground wave.

73, Dick, PA0SE
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