[Lf] [Fwd: LF: Re: Calculating ERP from measured field strength]

[Andre Kesteloot]

Dick Rollema wrote:

> 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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