Re: LF: EbNaut LF test from iz7slz

[IZ7SLZ <iz7slz.domenico@gmail.com>]

Thank you Andy for the report and many compliments for your receiver.

Just for another test, transmission in progress (21:30 UT) is formed by 39 characters at 0.5s. Total duration is 17'52".
Let's see what's  happen.
73, Dom.




On 11/19/2015 8:53 PM, Andy Talbot wrote:

BINGO !!!!!!!!!

   (Text = "GE PAUL TNX RPRT"  in case the graphic below doesn't get thought

near Instant decode on the 1930 Transmission

(ignore the Rx frequency showing as 60000, its something I haven't implemented [yet]  in my file save)

Andy  G4JNT

On 19 November 2015 at 18:28, IZ7SLZ <iz7slz.domenico@gmail.com> wrote:

---
In the past, Domenico sometimes suffered from a GPS ambuiguity which gave him a one second clock error. 
---

Yes, my clock is derived from Jupiter GPS and its 1_pps signal. Sometimes nmea is late of 1 second and i have to rectify that.

Sorry for the inconvenience.

Maybe i can send only unmodulated carrier for the next 30' just to allow Paul to make a phase measurent ?

Cheers

Domenico
 


On 11/19/2015 7:02 PM, Markus Vester wrote:

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 <andy.g4jnt@gmail.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
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 <markusvester@aol.com> 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 <iz7slz.domenico@gmail.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
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)