RE: LF: EA5DOM LF tests

[VIGILANT Luis Fernández <luis@vigilant.es>]

Hi LF

 

Yes Markus. Signal must be following some Ryanair path bouncing from plane to plane :-)

 

Since last night U3 transmits continously frame after frame. No stop to GPS calibration

So may be the increase in decodes this night is due to a better phase coherence

 

73 de Luis

EA5DOM

---

De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de Markus Vester
Enviado el: lunes, 05 de septiembre de 2016 11:12
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: EA5DOM LF tests

Olá Luis,

one more detection yesterday and three this morning - we seem to have a private LF duct between us ;-)

73, Markus (DF6NM)


-----Ursprüngliche Mitteilung-----
Von: VIGILANT Luis Fernández <luis@vigilant.es>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 1 Sept 2016 2:21 pm
Betreff: RE: LF: EA5DOM LF tests

Thank you for the phase info Markus

 

Can recall that the first tests last spring with same power and U3 were phase coherent

 

But my U3 suffered a hard reset and turned back to factory default parameters, so probably the park function

makes the difference. Will set it and test tonight

 

The other difference with previous test is that I'm not transmitting continously. Only one frame every hour

starting at minute 45

 

Thank you Stefan. The variometer in L1 is at minimum. So it is easy to add a bit more inductance

Will be better to add a bit more power soon and see if we can go for QSO ;-)

 

73 de Luis

EA5DOM

---

De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de Markus Vester
Enviado el: jueves, 01 de septiembre de 2016 12:50
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: EA5DOM LF tests

Thanks a lot for the transmission, and the report on the report ;-) Nice setup indeed on top of your roof!

I believe that the U3 by default does not preserve phase between dashes (possibly depending on a "park mode" setting but I'm not sure). If  you could make the transmission coherent the opds correlator might gain another 3 to 4 dB sensitivity.

All the best,
Markus 

-----Ursprüngliche Mitteilung-----
Von: VIGILANT Luis Fernández <luis@vigilant.es>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 1 Sept 2016 11:10 am
Betreff: LF: EA5DOM LF tests

Hi LF

 

Last night the LF coils were connected and started to transmit Op32 with just the 100mW from U3

https://dl.dropboxusercontent.com/u/7162072/fotos%20varias/MF/MF%20and%20LF%20coils.jpg

 

So far, an Op32 correlation decode from Markus. Nice Rx Markus ! :-)

Who's next ?? ;-)

2016-09-01 04:18:19 EA5DOM  1500km 137519.968Hz  28mHz -42.5dBOp  93% 15.5dB

I have tested the effect of the Ultrabeam dynamic antenna I use as a support pole while

working as variable capacitor. I can get the resonance 15KHz down by extending fully the internal

metallic element of the vertical antenna. A great aid for remote tunning from shack

73 de Luis
EA5DOM