Hello Dick and all,

Thanks very much for your figures.  I am not srprised at program predicting
accuracy because attenuation is not very much different from 6dB for every
doubling of distance and not much affected by type of ground.  I consider
+/- 3dB to be not very much where 300 km radio propagation is concerned.
;o)

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.

What DOES surprise me is the accuracy of the group's measurements.  There
should be prizes given for such careful meticulous work !

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

========================
Regards from Reg G4FGQ
Free Radio Design Software
Go to  http://www.g4fgq.com
========================

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Reg Edwards, G4FGQ, has a free  program called "Grndwav3" on his web site:
www.btinternet.com/~g4fgq.regp/page3.html#S301.

Entering Jim's EMRP=218mW and distance 329km the program predicts for the
field strength at PA0SE the following:

Sea water: 10.35 microvolt/m
average:       8.18 microvolt/m
pastoral:       9.50 microvolt/m.

I measured 11 microvolt/m so Reg's program can also be used when the CCIR
curves are not available.
73, Dick, PA0SE