|
Markus, Stefan
Yes ... of course the bandwidth can be changed. In today's case, the
receiver / SpecLab was set up at noon based only on Stefan's
information. Unfortunately I won't make it back home until late
tonight ... at which time it will either be too late ... or I'll be too tired to
make the changes ;~) .
Jay W1VD
----- Original Message -----
Sent: 1/16/2019 5:49:10 PM
Subject: Re: LF: Re: EbNaut tonite
Hi Jay, if you want you can increase your observation
bandwidth by using a 4x smaller decimation factor, compensated
by 4x larger FFT size to maintain the same bin width and
duration. Of course you'll also need to increase the number of exported FFT
bins by the same factor, producing 4x larger files. Also the FFT center
should be lowered by 5 Hz to the middle of the three
frequencies. Best 73, Markus -----Ursprüngliche Mitteilung----- Von: jrusgrove < [email protected]> An:
rsgb_lf_group < [email protected]> Verschickt:
Mi, 16. Jan. 2019 23:29 Betreff: Re: LF: Re: EbNaut tonite
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
|
