[Lf] Radiated power at PA0SE

[Andre Kesteloot]

Dick Rollema wrote:

> To All from PA0SE Yesterday I have measured the field strength of my
> LF transmitter at a distance of 5.83km; more than enough to be outside
> the near field  that would disturb the measurement. The location was
> open countryside without buildings and streetlamps or other signs of
> buried cables that could distort the field.Using an untuned single
> turn loop and a Wandel & Goltermann selective level meter type SPM-12,
> run off the car battery, I found a FS of 370 microvolt/metre. From
> this follows an impressive radiated power (EIRP) of 52 milliwatt. I
> simulated the aerial system using computer program AO.The impedance at
> the feed point of the arerial is given by the computer as Z = 0.045 -
> j3817 ohms. Aerial current is 1.95A. This results in an EIRP of 1.95 *
> 1.95 * 0.045 W = 171 milliwatt.Measured value was 52 milliwatt.
> Apparantly 5.2dB is lost due to radiation into the earth and
> absorption in surrounding objects of the aerial; a figure that has
> been reported by others as well. I also measured the field strength of
> DCF139 in the countryside and found 2mV/m,  the same value as in my
> shack. I have sent this message before, but then extended with a
> photograph (40.7kB) and description of the aerial system. But this was
> apparantly rejected by the reflector; at least I did not receive in my
> own mailbox. 73, Dick, PA0SE



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