Re: LF: EbNaut Attempt?

[Markus Vester <markusvester@aol.com>]

Another idea: You might get away with the XOR before the /2 divider if you use it to insert an extra short pulse at each PSK edge. Don't know whether this is really reliable due to asynchroneous timing between carrier and modulation, but perhaps simple enough to give it a try.

Looking forward to your first message!

Best 73,
Markus 



-----Ursprüngliche Mitteilung-----
Von: VIGILANT Luis Fernández <luis@vigilant.es>
An: rsgb_lf_group@blacksheep.org <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 4. Okt 2018 16:03
Betreff: RE: LF: EbNaut Attempt?

Thank you Riccardo

 

And thank you Antonio too, for the complete information in the web page

I will make a pcb with the 4013 and 4070 to be piggi backed into the 4013 shocket

 

73 de Luis

EA5DOM

 

De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de Riccardo Zoli
Enviado el: jueves, 04 de octubre de 2018 10:37
Para: LF Group <rsgb_lf_group@blacksheep.org>
Asunto: Re: LF: EbNaut Attempt?

 

 

Hi Luis, Markus, LF

 

Yes, Luis. Like Markus said, you're using a wrong position to change the phase.

With Tony IK1HGI, we have tested a solution to produce a correct BPSK modulation using a G0MRF PA schematic. Here's the link to Tony's website page, that explained clearly what to do:

 

https://www.qsl.net/ik1hgi/472khz/modulatore.htm

 

 

In short, the XOR operation must be carried out after the x2 stage (D-ff, CD4013) simultaneously on Q and Q denied signals.

 

All the best

 

 

 

73 de Riccardo IW4DXW

 

 

 

 

 

Il 04 Ott 2018 07:37, "VIGILANT Luis Fernández" <luis@vigilant.es> ha scritto:

Hi Markus, EbNaut

 

It was me, with 80w from the D class PA

 

I'm producing 180° phase shifts with xor at 2x the frequency to feed the PA. So it seems that the PA do also reduce phase shifts to half :(

 

Which would be the way to do it ?

 

Congratulations for the EbNaut grabbers

 

73 de Luis

EA5DOM

 

El 3 oct. 2018 11:29 p. m., Markus Vester <markusvester@aol.com> escribió:

Between 19:58 and 20:28 there was a strong and stable signal on 137490.0 Hz, coming in from west or southwest. However the keying seemed to be in 90° steps instead of 180°, so not decodable. Maybe a problem with a /2 divider in the transmit chain?

Best 73,
Markus (DF6NM)

 

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