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Riccardo, Domenico
Deja vu ... seems like we've been here before
...
The receiver / SpecLab was set up earlier in the
day to receive Stefan's transmissions on
137.545. Unfortunately, both of your announced frequencies are outside
the passband in the current setup ... which is approximately +/- 3 Hz. In
the future it would be best if you could stay within 3 Hz. Think
Marcus advocated for 1 Hz separation in the past.
Will be happy to look for your EbNaut signals
another night.
Jay W1VD
----- Original Message -----
Sent: Wednesday, January 16, 2019 3:52
PM
Subject: Re: LF: Re: EbNaut tonite
Hi LF & EbNauters.
Ok, Stefan and Domenico: I'll join you with the same
transmission coding and parameters on 137.535 kHz (message
repeated hourly, 1st on 2100z, last on 0700z).
Reports are welcome.
All the best
73 de Riccardo IW4DXW
LF,
I will transmit a 4 character message with EbNaut on 137.540
kHz, sym=8s, code=4K19A, CRC=16.
Transmissions will start on 2019-01-16 22.00 UTC with a duration of 30'
56''; then repeated every hour. Last transmission on 2019-01-17 06:00.
TX setup in use: Paul N. Program 'EbSynth' steered with 10 kHz from
GPS, analog SSB exciter with reference oscillator steered by the same GPS,
'gpds' and 'chrony' programs for controlling the UTC time of the
computer.
Antenna current = 1.5 A, antenna type rev-L 8+8 meters.
Reports are welcome.
73, Domenico IZ7SLZ / JN80nu
Hello Stefan and LF,
Attached to this email there is a folder with the plots of the eight
periods. First two transmissions seems to be affected by fading.
I want to join your EbNaut session tonight with some transmissions
from my side. I will announce the parameters as soon the setup is
ready.
73, Domenico IZ7SLZ
Hello Rob and Jay, Many thanks for the
reports and all the details. Jay, did you miss the 22 UTC transmission
or did it not decode? Interesting to see the phase plots. It is
expected that the phase is less stable when the band opens. In the last
transmission, the Eb/N0 is not high enough to see the phase
pattern. I wonder if the traces become more evident if 4K19 is
used. What happens when a solar event happens during the
transmission time? Does it change the phase or just the D layer
attenuation? Maybe we can repeat the experiment, using 4K19A. Of
course a carrier could be used too, but i like to 'play' with
EbNaut. So, tonite: f = 137.545 kHz
Start time:
16.JAN.2019 22:00:00.3 UTC
Symbol period: 8 s
Characters:
4
CRC bits: 16
Coding 4K19A
Antenna current: 4
A
Duration: 30:56 [mm:ss]
73,
Stefan Am 16.01.2019 12:29, schrieb Rob Renoud:
Stefan,
Late start but 7 successful decodes. Have not gotten to
phase plots yet...
| UTC |
Rank |
C
Eb/N0 |
Eb/N0 |
MSG |
Ref
Phase |
| 0100 |
0 |
5.6 |
1.6 |
2019 |
0,-30,0
30 |
| 0200 |
0 |
6.9 |
0.4 |
2019 |
60,30 30
0 |
| 0300 |
0 |
9.9 |
5.8 |
2019 |
90,60,60,0 |
| 0400 |
0 |
11.2 |
8.8 |
2019 |
180,180,150,150 |
| 0500 |
0 |
6.3 |
2.7 |
2019 |
0,-30,-30,-60 |
73,
Rob – K3RWR
Sent: Tuesday, January 15, 2019 9:33 PM
Subject: Re: LF: Re: EbNaut tonite
LF,
Today, the messages will be transmitted as announced, starting
22 UTC 73, Stefan Am 14.01.2019 22:16, schrieb DK7FC:
PS: Repeatinh hourly, until including 6
UTC.
Am 14.01.2019 22:13, schrieb DK7FC:
Hi LF,
Just a short EbNaut message
tonite. I'm interested to see the phase changes on a long path.
Markus's showrawsyms does a good job there, as long as 8K19A is
used. A shorter message should also help to build up a clear
trace.
So let's try an unusual short message:
f =
137.545 kHz
Start time: 14.JAN.2019 22:00:00.3
UTC
Symbol period: 4 s
Characters: 4
CRC bits:
16
Coding 8K19A
Antenna current: 4 A
Duration:
30:56 [mm:ss]
Reports, including phase plots, welcome
:-)
73,
Stefan
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