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

[Andre Kesteloot]

Dick Rollema wrote:

> 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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