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Re: LF: EbNaut LF test from iz7slz

from [Markus Vester] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: EbNaut LF test from iz7slz
From: Markus Vester <[email protected]>
Date: Thu, 19 Nov 2015 13:02:39 -0500
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1447956160; bh=uWtmsZix8w0P4KpZqFOyuDeASJ6kD/u2FKicnhPyBpc=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=XzAd9uDIRNxNQj6J1onpdXBHT10tq2fZm1aVagETH1SbhgJqiYXbcHDsgn86FMQ06 nuxqMuP5aR8Cka3NT0SBaYb8DgLoeWx8VR4++/s8nrtwAVuteKJDFW+NpyedV+Rm2R ytOg5DO05EzL+3Ne8lKgrR1MOx47zmuXKcSm3kwk=
In-reply-to: <CAA8k23QT5eM1XbeXb7nSv8T=kmmwVppAxhVFb0=ejtF4wzQkww@mail.gmail.com>
References: <CAA8k23QT5eM1XbeXb7nSv8T=kmmwVppAxhVFb0=ejtF4wzQkww@mail.gmail.com>
Reply-to: [email protected]
Sender: [email protected]
As far as I can see the transmission is on the nominal frequency. I needed the offset because I had set my center frequency to 136171 Hz, minus 0.0175 Hz due to known RX DDS rounding.
 
The sequences seem to be somewhere between 0.9 and 1.4 seconds behind UT. I can't tell better because I'm currently decimating to a fairly low samplerate, introducing significant timing granularity. In the past, Domenico sometimes suffered from a GPS ambuiguity which gave him a one second clock error.  
 
Best 73,
Markus
 

-----Ursprüngliche Mitteilung-----
Von: Andy Talbot <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Do, 19 Nov 2015 6:49 pm
Betreff: Re: LF: EbNaut LF test from iz7slz

Also, looking at the log.txt file, there is 0.98Hz error showing.   Is this a value that MUST be entered, or can the software derive it?

Andy


On 19 November 2015 at 17:30, Markus Vester <[email protected]> wrote:
Hi Domenico,
 
got your 15, 16 and 17 UT transmissions ok, with Eb/N0 3.1, 11.8 and 9.0 dB respectively.
 
It looks like the symbol timing is a bit over one second late.
 
Best 73,
Markus (DF6NM)
 

-----Ursprüngliche Mitteilung-----
Von: IZ7SLZ <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Do, 19 Nov 2015 1:04 pm
Betreff: LF: EbNaut LF test from iz7slz




Good day LF, all 

  

 some coherent bpsk test  transmissions with EbNaut are now scheduled  

 from here (JN80NU) on QRG = 136170.00 Hz  every hour starting at 13:00. 

  

 Message is composed of 16 characters with 1s/symbol. Duration of the  

 transmission is 17'20''. Scheme-code is 8K19A. 

  

 Thanks for the attention. 

  

 73, Domenico (iz7slz)



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