...8 night transmissions completed. However the last nights transmission
stopped at 18. Nov, 04:19 UTC due to strong snow.
I'm thinking about a dynamic safety limit: A dangerous fault on the coil
will lead to a sudden drop of the antenna current (> 10 mA/sec) whereas
snow or strong rain will cause a slower drop of the antenna current.
This could be detected in a more 'intelligent' safety function that will
quickly react in case of a fault and it will notice when the current
drops very slowly and accept even lower currents...
73, Stefan
Am 15.12.2017 23:36, schrieb DK7FC:
Thanks Paul,
Oh oh oh it is not easy at all! The stacking works with limited
improvement over that path. Wonder if 8270 Hz would work better...
The next transmission is already running..
One could correct the phase and stack then. But this would not be
legitimately because the message is unknown to the receiving station,
so it can't know the phase before the decode happens.
I'm missing the really low frequencies :-)
73, Stefan
Am 15.12.2017 19:32, schrieb Paul Nicholson:
Still not there yet.
2017-12-10/11 Eb/N0 = -13.1 dB (very noisy night)
2017-12-11/12 Eb/N0 = -6.3 dB, phase 125.3
2017-12-12/13 Eb/N0 = -6.8 dB, phase 143.2
2017-12-13/14 Eb/N0 = -19.6 dB
2017-12-14/15 Eb/N0 = -6.0 dB, phase 68.8
Stacking
11/12 + 12/13 gives Eb/N0 = -3.6 dB.
11/12 + 12/13 + 14/15 gives Eb/N0 = -3.0 dB.
Good signal last night but the phase was a bit
different.
--
Paul Nicholson
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