Hi Paul,
Thanks for the efforts and feedback.
So far the best result is 10 characters with 100s symbols 8K19A, that
was in May.
Its strange that the 3 char message didn't decode with 60s symbols!
Now its nearly November. Perhaps its a good idea to try to get shorter
messages through, just to see how the SNR will look.
I could start in the morning hours, 3 characters at first.
So be prepared! :-)
73, Stefan
Am 27.10.2016 21:10, schrieb Paul Nicholson:
Recent transmissions from Stefan
2016-10-05_21:00:02,+138880 6470.0 S140 C15 8K19A
2016-10-07_21:00:02,+166400 6470.0 S80 C15 16K25A
2016-10-10_14,+29h 6470.0025 carrier
2016-10-12_14:30:00,+16640 6470.0 S40 C3 8K19A
2016-10-13_06:00:00,+41600 6470.0 S20 C15 16K25A
2016-10-14_13:15:00,+24960 6470.0 S60 C3 8K19A
Sadly, unable to decode any of the EbNaut messages
although 2016-10-07_21:00:02,+166400 looked close
with a couple of partial decodes:
'DK7FC4R,3ZSB35X' Eb/N0 = -0.4dB
'DK7FC4273 U8Z ' Eb/N0 = -1.1dB
The carrier has been useful and I managed to gain
nearly a dB using it to play with blanker settings,
E-field mix and loop pointing. E-field mix is
fiddly, amplitude depends on the weather!
Using the carrier (which decodes to **** messages)
I obtained the following all-star decodes from
the 06:00 to 18:00 signal,
16K25A S30 C8 Eb/N0 = +2.3 dB ber 37.1%
16K25A S25 C11 Eb/N0 = +1.2 dB ber 37.8%
16K25A S20 C15 Eb/N0 = -1.0 dB ber 40.0%
8K19A S60 C9 Eb/N0 = +0.9 dB ber 33.8%
8K19A S45 C14 Eb/N0 = 0.0 dB ber 34.1%
8K19A S40 C15 no decode
I continue to think that the best prospect for a 15 char
success is the 12 hour daytime signal with 16K25A 20
second symbols. It might take a couple of attempts.
We seem to struggle with transmissions that use both
day and night. I've tried compensating for the extra
~60 degree nighttime phase lag but that didn't help.
I'm running some trials with 24 hours of the carrier
to see what can be done. I've also been playing
with a suggestion that Markus made some time ago to
normalise the day/night amplitudes in various ways.
--
Paul Nicholson
--
|
