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Re: LF: Re: LF EbNaut tonite

To: "[email protected]" <[email protected]>
Subject: Re: LF: Re: LF EbNaut tonite
From: "[email protected]" <[email protected]>
Date: Tue, 13 Nov 2018 06:26:04 -0500
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Stefan
 
Not much to see in showrawsyms.exe ... below is the transmission that actually decoded. The rawsyms from the other transmissions have high frequency and time error numbers. DST is in the -20 nT range IIRC ... so may just be poor condx with an ocassional favorable propagation peak. During good condx I would expect a solid decode on virtually all transmissions. I'm good ... you can move on to more challenging experiments if you like ;~) .
 
 
 
 
Jay W1VD 
 
 
----- Original Message -----
From: DK7FC <[email protected]>
Reply-To: <[email protected]>
Cc: Garry and Linda Hess <[email protected]>
Sent: 11/13/2018 4:21:10 AM
Subject: Re: LF: Re: LF EbNaut tonite

Hi Jay,

Thanks for the decode. Great work despite the QRN!

Regarding the other transmissions that failed to decode: Maybe it's not a question of the SNR but rather the phase stability (of the propagation path). Do you watch the showrawsyms.exe image?

Maybe it is an idea to use a shorter message, so it will decode at even lower SNR, but still won't if its a phase issue. This may also be helpful for others beeing farer inland, like K3RWR, or maybe K3SIW?

Do you like another session?

Tonite:

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]


73, Stefan




Am 13.11.2018 04:10, schrieb [email protected]:
Stefan
 
Copy below. No decode prior to 0200 transmission ... then BANG 0,0,0,0, rank 0. 'Crunchy' QRN condx here tonight. Tnx fer the EbNaut 'workout'.  
 
 
Jay W1VD 
 
 
 
 
 
----- Original Message -----
From: DK7FC
Sent: Monday, November 12, 2018 2:44 PM
Subject: Re: LF: Re: LF EbNaut tonite

LF,

Another opportunity tonite:

f = 137.620 kHz
Start time: 12.NOV.2018  20:00 UTC (hourly, until including 6 UTC)
Symbol period: 1 s
Characters: 20
CRC bits:
16
Coding 8K19A
Antenna current: 4 A
Duration: 20:32 [mm:ss]


Markus, do you like to join? We could try a QSO with these settings.

Note the different TX frequency. It is outside the WSPR-2 band, but not to far.
Unfortunately i cannot tune the resonance frequency because my coil does not have a variometer coil at the moment. So i need to stay in that range. 137.62 is just the resonance spot right now.

73, Stefan



Am 12.11.2018 13:52, schrieb Rob Renoud:
Jay and Stefan,
 
I attempted my first over the air EbNaut decodes last night using two separate receive systems.  All appeared well but find that both instances of SL did not save the entire wave file for each receive period but truncated it to about 165K.  Will play with that today as have not experienced that in previous end-to-end sessions in the shack.
 
Well done and thanks for putting the EbNaut signal on the air, Stefan.  Thanks for posting yours, Jay, as it confirms I should have been able to copy all.  Look forward to another opportunity.
 
73,
Rob - K3RWR
 
Sent: Monday, November 12, 2018 1:34 AM
Subject: Re: LF: LF EbNaut tonite
 
Stefan
 
Copy of your message below. The message is not blacked out since it was already available on Marcus's automated decoder. Nice to see rank 0. Will be looking for Marcus next!
 
 
Jay W1VD
 
 
----- Original Message -----
From: DK7FC <[email protected]>
Reply-To: <[email protected]>
Sent: 11/11/2018 2:01:37 PM
Subject: Re: LF: LF EbNaut tonite

PS: The message is transmitted from a SpecLab instance. So you need to consider the +0.3 second time offset, which is relevant at that symbol length. Furthermore there is some uncertainty if the transmission starts at the exact second. It could happen that it starts 1 second to late. We will see what happens.

73, Stefan

Am 11.11.2018 18:38, schrieb DK7FC:
Hi LF,

I'd like to try some EbNaut transmissions tonite. Maybe someone is some distance is interested to detect them?

Here is the program:

f = 137.465 kHz
Start time: 11.NOV.2018  19:00 UTC (hourly, until including 7 UTC)
Symbol period: 1 s
Characters: 21
CRC bits:
16
Coding 8K19A
Antenna current: 4 A
Duration: 21:20 [mm:ss]


Reports welcome.

73, Stefan
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