Many thanks Paul.
Jacek will now have enough data on his storage to produce a decode on
his side. Hopefully he finds the time :-)
Well, after having 5 nights to analyse from the files kindly provided
by RN3AUS, we see that there are significant phase changes each day,
almost like in the experiment on 17.47 kHz with Mike Smith.
When applying data that is known by the RX station (for getting a valid
decode) we don't get a better Eb/N0 (currently staying at -8.8 dB after
5 days). Either it is propagation or something is wrong with the RX.
But the RX worked well just a few days ago, so maybe it is indeed
propagation. We could try one character soon or try again on a
different frequency, maybe 100 Hz lower to hope for less phase
variations and less days needed for stacking.
At least for this experiment i will now stop transmitting that message
and prepare things for the next 970 Hz test which can hopefully
start this weekend then.
73, Stefan
Am 25.01.2018 14:23, schrieb Paul Nicholson:
Stefan wrote:
> f = 4470.100000 Hz
> Start time: 18.JAN.2018 16:00:00 UTC
> Symbol period: 60 s
> Characters: 2
> CRC bits: 16
> Coding 16K23A (NEW)
> Duration: 13h20min [hh:mm]
> Antenna current: 300 mA
Todmorden (881.2 km)
--------------------
19/20 Eb/N0 +8.6 dB, S/N -27.7 dB/1Hz, phase 70.3 *Decoded*
20/21 Eb/N0 +10.8 dB, S/N -25.4 dB/1Hz, phase 65.0 *Decoded*
21/22 Eb/N0 +4.4 dB, S/N -31.8 dB/1Hz, phase 78.3 *Decoded*
22/23 Eb/N0 +5.7 dB, S/N -30.5 dB/1Hz, phase 93.2 *Decoded*
23/24 Eb/N0 +6.1 dB, S/N -30.2 dB/1Hz, phase 92.4 *Decoded*
24/25 Eb/N0 +6.6 dB, S/N -29.6 dB/1Hz, phase 94.0 *Decoded*
Average S/N 4470 Hz: -29.2 dB, 5170 Hz: -28.1 dB;
Bielefeld (303.8 km DL4YHF)
---------------------------
19/20 Eb/N0 -2.0 dB, S/N -38.3 dB/1Hz, phase -45.2;
20/21 Eb/N0 +12.5 dB, S/N -23.8 dB/1Hz, phase -55.7 *Decoded*
21/22 Eb/N0 +6.9 dB, S/N -29.4 dB/1Hz, phase -59.7 *Decoded*
22/23 Eb/N0 -21.0 dB, S/N -57.2 dB/1Hz;
23/24 Eb/N0 +1.6 dB, S/N -34.6 dB/1Hz, phase -105.2 *Decoded*
24/25 Eb/N0 +1.9 dB, S/N -34.4 dB/1Hz, phase -95.5 *Decoded*
Have repairs to the front-end changed the phase response?
Cumiana (504.6 km IK1QFK)
-------------------------
19/20 Eb/N0 +8.9 dB, S/N -27.4 dB/1Hz, phase -116.3 *Decoded*
20/21 Eb/N0 +11.3 dB, S/N -24.9 dB/1Hz, phase -105.0 *Decoded*
21/22 Eb/N0 +7.4 dB, S/N -28.8 dB/1Hz, phase -107.5 *Decoded*
22/23 Eb/N0 +8.3 dB, S/N -27.9 dB/1Hz, phase -105.4 *Decoded*
23/24 Eb/N0 +8.3 dB, S/N -28.0 dB/1Hz, phase -95.2 *Decoded*
24/25 Eb/N0 +8.2 dB, S/N -28.1 dB/1Hz, phase -109.0 *Decoded*
Average S/N 4470 Hz: -27.5 dB, 5170 Hz: -31.0 dB;
Warsaw (919.3 km SQ5BPF)
------------------------
19/20 No uplink
20/21 No uplink
21/22 Eb/N0 -3.2 dB, S/N -39.4 dB/1Hz, phase 75.3;
22/23 Eb/N0 -6.3 dB, S/N -42.5 dB/1Hz, phase 70.7;
23/24 Eb/N0 -12.1 dB, S/N -48.3 dB/1Hz;
24/25 Eb/N0 -7.4 dB, S/N -43.6 dB/1Hz, phase -125.2;
Uplink very intermittent.
--
Paul Nicholson
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