Hello Rob,
My congrats to your first EbNaut decode! And even quite a distance:
http://k7fry.com/grid/?qth=FM18QI&from=jn49ik00
It is interesting that you captured such an early transmission.
As mentioned, it is worth to play with small time offsets of +- 5%,
10%, 15% of a symbol length to see what the maximum SNR will be. Even
applying a small frequency offset can help. My Tx frequency is accurate
but as you see, your phase pattern is turning by -60 deg
(180,150,150,120) during the transmission time. So this is -1/6 cycle
in 1536 seconds, or -109 uHz. EbNaut can compensate up to 90 deg phase
drift i think. So, if there is no decode or just rubbish, it can help
to apply a small frequency offset and try again...
73, Stefan
Am 14.11.2018 12:40, schrieb Rob Renoud:
Stephan and EbNaut,
I captured your 2200Z transmission for my first over-the-air
EbNaut decode  . Still working out the
whole process but am pleased that everything came together. Tnx for
the transmissions! No other decodes at the moment.
Jay, appreciate your comments
about capture bandwidth. Had not taken that into account with regard
to including the spectrum of all the stations doing EbNaut.
73,
Rob – K3RWR
FM18qi
Sent: Tuesday, November 13, 2018 8:46 PM
Subject: Re: LF: Re: LF EbNaut tonite
Hi
Jay,
Am 13.11.2018 21:31, schrieb [email protected]:
Stefan
Did you announce your intentions
for tonight's EbNaut transmission ... if so, I must have missed it.
Jay W1VD
Yes:
f = 137.620 kHz
Start time: 13.NOV.2018 21:00 UTC (hourly, until including 6 UTC)
Symbol period: 3 s
Characters: 5
CRC bits: 16
Coding 8K21A (!)
Antenna current: 4 A
Duration: 26:24 [mm:ss]
From my todays email of 9:21 UTC.
73, Stefan
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