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Re: LF: EA in LF NOW !

To: "[email protected]" <[email protected]>
Subject: Re: LF: EA in LF NOW !
From: VIGILANT Luis Fernández <[email protected]>
Date: Sat, 16 Apr 2016 10:10:12 +0000
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Thread-topic: LF: EA in LF NOW !
Hi LF

M0DSZ decoded me in Opera Deep Search last night at 1596Km, so ODX so far

04:57    136 EA5DOM de M0DSZ Op32 Deep Search 1596 km -42 dB in NW Shropshire, IO82LS 1512.3 Hz
04:53    136 EA5DOM de EA5DOM Op32 0 km -10 dB F:1%_End in Albir 1510,3 Hz
04:23    136 EA5DOM de M0DSZ Op32 Deep Search 1596 km -43 dB in NW Shropshire, IO82LS 1512.3 Hz

Thank you for the report on the phase carrier Markus

I have been transmitting continous periods setting the "Frame Start" U3 menu to "00 00"
May be this is the reason for the phase coherent carrier. To test this, I changed the settings last night
So during last night I set 2 minutes pause between transmissions. This also allowed the U3 to make a GPS calibration
which did not happen before. Anyway, as there are no BS170 heating inside the box, frequency stability is quite good

>From your correlation detections list looks like last night I didn't got so many. May be the phase is not coherent now ?

Finally, made an RMS measurement of U3 output over 50Ohm
Power is a few dBs over 100mW, but still QRP. The 100mW figure was at MF
https://dl.dropboxusercontent.com/u/7162072/Fotos%20varias/MF/U3%20over%2050Ohm%20at%20137KHz.png

73 de Luis
EA5DOM


De: [email protected] [[email protected]] en nombre de Markus Vester [[email protected]]
Enviado: viernes, 15 de abril de 2016 10:00
Para: [email protected]
Asunto: Re: LF: EA in LF NOW !

Plenty of good opds detections again here last night: https://dl.dropboxusercontent.com/u/26404526/opds.htm
 
Moving the zoomed section of the spectrogram to your QRG shows a good and narrow (albeit slightly drifting) central carrier. This means that your version of the U3 is keying coherently with continuous carrier phase, helping opds to reach it's full sensitivity. According to earlier observations on MF, there also other Ultimate versions out there which apparently reset the DDS during the gaps, producing random-phase symbols with no continuous carrier.
Best 73,
Markus (DF6NM)

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