Re: LF: EbNaut test at 8270.00332 from JN64bw

[Riccardo Zoli <riccardozoli80@gmail.com>]

Hi VLF,

Soon, another attempt with 2 char and a stronger coding.

f = 8270.00332 Hz
Start time: 20:00:00 UTC
Symbol period: 60 s
Characters: 2
CRC bits: 10
Coding 16K21A
Duration: 11h,12min
Antenna current: 395 mA

All the best

73 de Riccardo IW4DXW

Il 16/Dic/2017 22:27, "Riccardo Zoli" <riccardozoli80@gmail.com> ha scritto:

Hi VLF,

I'm ready for another transmission:

f = 8270.00332 Hz
Start time: 21:30:00 UTC
Symbol period: 30 s
Characters: 3 (repeated)
CRC bits: 24
Coding 16K21A

Duration: 8h,16min
Antenna current: 395 mA

...thanks again for reports.

All the best

73 de Riccardo IW4DXW

Il 15/Dic/2017 23:21, "Riccardo Zoli" <riccardozoli80@gmail.com> ha scritto:

Hi Paul, Stefan, VLF

OK, Paul, thanks again for reports!

It's raining here this evening and I'm QRT.

Tomorrow I'll try again with same message to improve stacking.

Yes, Stefan. OK, I'll try also a much longer transmission. I have got some problems on aerial these nights due to corona effect. Yesterday, I installed two ceramic insulators on each anchor point and last night I had no problem with about 400mA.

I notice that coil under forced ventilation

it's much more efficient.

All the best

73 de Riccardo IW4DXW

Il 15/Dic/2017 12:24, "Paul Nicholson" <vlf0403@abelian.org> ha scritto:

Riccardo wrote:

> f = 8270.00332 Hz
> Start time: 21:30:00 UTC
> Symbol period: 30 s
> Characters: 3 (repeated)
> CRC bits: 24
> Coding 16K21A

 Todmorden: Decoded correctly, Eb/N0 = 0.0 dB, -32.4 dB in 1Hz.
            BER 38.8%, rank 262772.  Ref phase -30 -30 0 0
            Constant ref phase is 0.1 dB weaker.

 Bielefeld: No decode, Eb/N0 = -4.6 dB

 Cumiana:   No decode, Eb/N0 = -3.7 dB

 Warsaw:    No decode, Eb/N0 = -8.7 dB

Phase repeatability:

 Todmorden  13/14:    35.7 deg     14/15:   19.1 deg
 Bielefeld  13/14:   161.9 deg     14/15:  103.1 deg
 Cumiana    13/14:  -116.0 deg     14/15:  -95.4 deg

Stacking the two nights at Cumiana gives Eb/N0 = -1.5 dB,
still too weak to decode.

Reception worse here last night but better at the other sites.
Quite a lot of rain/snow static last night on the E-field antenna.

--
Paul Nicholson
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