Hi David,
I did some experiments with VK2ZEN in Newcastle - 194km distance by GPS. We
tried machine reception of CW, RTTY, PSK31 and MFSK16. There was a lot of
QRN. MFSK16 provided 100% copy down to about 10 watts, with RTTY and PSK31
requiring about 30 watts for 100% copy. CW was woeful - about
(crossposted to NVIS and Digital Radio)
The effect of the ionosphere on digital signals was discussed on a webpage
that I coincidentally read this morning while looking at soundcard modes.
Murray ZL1BPU has created 'DominoEx', with the details at
http://www.qsl.net/zl1bpu/DOMINO/Index.htm
NVIS is
> Walt/K5YFW wrote:
> On a 100 mile NVIS path (using the ionospheric heigth as 175 miles),
> the first hop would needed to be radiated at 64 deg. The second hop
> at 76 deg, the thrid hop at 81 deg and the forthe hop at 83 deg.
>
> If you are using a dipole or Inverted V antenna with the feed poi
