Stefan,
Thanks for the information on list length with regard to the selected EbNaut configuration. I was unaware of this previously.
Tnx, Rob - K3RWR
Hi Rob, Jay,
You need to select a lower list length if CRC8 is used together with 8
characters.
See
http://abelian.org/ebnaut/calc.php?sndb=20&snbws=&snmps=1776&code=8K19&sp=3&crc=8&nc=8&submit=Calculate
to calculate the optimum list length. It is 280 for a full phase
search. If you keep the default 20000, then a number of false decodes
are highly likely.
73, Stefan
Am 23.01.2019 13:31, schrieb Rob Renoud:
Riccardo and Jay,
No decodes here either. Had a number of low Rank
false decodes also. Suspect the low CRC may have allowed the false
decodes. I had similar results during the previous run.
Suggest a shorter character message with a higher CRC
with a similar duration. Also, if possible, suggest transmitting the
message on the hour and running an unmodulated carrier during the idle
period to enable monitoring with ARGO or a similar app. I have found
this very useful tool with EbNaut transmissions from VO1NA and K3SIW on
2200m and 185.185... kHz (LoFER) respectively.
73,
Rob - K3RWR
Riccardo
Late start last night (0000z). Unfortunately no decodes. There
were numerous low Rank false decodes ... not sure what's up with that!
Jay W1VD
----- Original Message -----
Sent: 1/22/2019 2:48:00 PM
Subject: Re: LF: EbNaut tonite
Sorry: message repeated every 30 minutes.
73, Riccardo IW4DXW
Jay, Rob, LF
QRG 137545 Hz
Coding 8K19A
CRC 8
3 sec./sym.
8 characters
duration 29 min. 36 sec.
no time delay
(1st on 1930 UTC, last on 0700 UTC)
Reports are welcome
All the best
73 de Riccardo IW4DXW
Riccardo
Glad to hear you found the
problem. Will await your announcement and look for your signal tomorrow
night.
Jay W1VD
-----
Original Message -----
Sent:
Monday, January 21, 2019 4:13 PM
Subject:
Re: LF: EbNaut tonite
Jay, Rob, Markus, Stefan, Joe, LF
Jay, thanks again for the decode: congrats for your rx
setup.
And thank you so much for trying, Rob.
Here, the TP2 reference signal (not sufficiently
filtered) overshot sometimes the quadrature divider (x4) causing that
phase jumps. The problem is now fixed.
A new TX EbNaut session is scheduled for starting
tomorrow evening.
All the best
73 de Riccardo IW4DXW
Riccardo
Corrected decode:
0300 Rank 0 car Eb/N0 2.3 Eb/N0 1.4 FBDECODE
Jay W1VD
----- Original Message -----
Sent: 1/21/2019 6:53:39 AM
Subject: Re: LF: EbNaut tonite
Stefan, Riccardo & EbNaut-eers
Stefan ... good copy throughout the night.
Riccardo ... unfortunately only one decode to report. Markus noted a
frequency error ... curious if propagation or NE0-M8T?
137545
2200 Rank 0 car Eb/N0 9.5 Eb/N0 9.2 RADIO GAGA
2300 -
0000 Rank 0 car Eb/N0 9.2 Eb/N0 9.3 RADIO GAGA
0100 Rank 0 car Eb/N0 6.0 Eb/N0 6.0 RADIO GAGA
0200 Rank 0 car Eb/N0 5.3 Eb/N0 5.9 RADIO GAGA
0300 Rank 0 car Eb/N0 6.1 Eb/N0 6.8 RADIO GAGA
0400 Rank 0 car Eb/N0 11.3 Eb/N0 10.4 RADIO GAGA
0500 Rank 0 car Eb/N0 3.7 Eb/N0 4.6 RADIO GAGA
0600 Rank 0 car Eb/N0 10.6 Eb/N0 10.2 RADIO GAGA
137547
0300 Rank 0 car Eb/N0 10.0 Eb/N0 FBDECODE
Jay W1VD
----- Original Message -----
Sent: 1/20/2019 12:48:34 PM
Subject: LF: EbNaut tonite
LF,
Tonite:
f = 137.545 kHz
Start time: 20.JAN.2019 22:00:00.3 UTC (hourly, including 6 UTC)
Symbol period: 1 s
Characters: 10
CRC bits: 12
Coding 16K21A
Antenna current: 4 A
Duration: 24:32 [mm:ss]
73, Stefan
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