RE: LF: EA5DOM LF tests

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

Hi LF

 

Thank you Stefan. Finally could see a trace in your grabber ! :-)

 

There were also five Opera-32 correlation decodes at Markus grabber

 

2016-09-07 04:35:09 EA5DOM  1500km 137519.916Hz 141mHz -30.9dBOp 100% 21.0dB
2016-09-07 03:35:09 EA5DOM  1500km 137519.924Hz 156mHz -37.0dBOp 100% 20.6dB
2016-09-07 02:35:09 EA5DOM  1500km 137519.948Hz 158mHz -36.5dBOp 100% 20.6dB
2016-09-07 01:35:09 EA5DOM  1500km 137519.923Hz 142mHz -36.1dBOp 100% 20.5dB
2016-09-06 23:35:09 EA5DOM  1500km 137519.904Hz 109mHz -38.9dBOp  83% 18.7dB

 

And "normal" decodes last night from  G3XDV, SV8RV and IK0VVE

 

2016-09-07 04:35:08

EA5DOM

IM98XN

G3XDV

IO91VT

1.473

136

-32

Op32_||||||||||||_~32dB

2016-09-07 04:35:08

EA5DOM

IM98XN

SV8RV

KM07KS

1.827

136

-39

Op32__~40dB

2016-09-07 03:35:08

EA5DOM

IM98XN

IK0VVE

JN61KM

1.146

136

-32

Op32_||||||||||||_~32dB

 

Iban, EB3FRN is decoding at -36dB this morning by ground wave at almost 300Km

and using a very ineficcient vertical antenna

2016-09-07 08:29:09

EA5DOM

IM98XN

EB3FRN

JN01MC

297

136

-26

Op32_||||||||||||||||||||||||_~26dB

 

I will try some QRSS of course. But first I want to make some trimming to the output transformer and see if this PA

can be squizzed. If not, this is definitely a good heater for wintertime but for only 5w of RF is not an option

 

Time for a D class PA  ;-)

Output filter and transformer core is already here, so should be easy to get some 50w or more (10dB)

 

73 de Luis

EA5DOM

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De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de DK7FC
Enviado el: miércoles, 07 de septiembre de 2016 11:21
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: EA5DOM LF tests

Hi Luis,

Oh yes, very nice!

DK7FC JN49IK Opera-32 correlation     http://df6nm.bplaced.net/opera/opds.zip

   date      time   call   distance  frequency bandwidth  snr    correlation

2016-09-07 04:35:08 EA5DOM  1398km 137519.960Hz  97mHz -37.7dBOp 100% 20.2dB
2016-09-07 03:35:08 EA5DOM  1398km 137519.910Hz 112mHz -48.5dBOp 100% 19.8dB
2016-09-07 02:35:09 EA5DOM  1398km 137519.928Hz  75mHz -42.0dBOp  46% 16.6dB
2016-09-07 01:35:07 EA5DOM  1398km 137519.926Hz  71mHz -99.9dBOp  77% 16.6dB

Somehow the bandwidth values are quite high. Normally it is arround < 10 mHz. Anyway, a nice result.

Do you like to try some QRSS-60 arround 136.172 +-3 Hz ? It's a long time ago that signals were seen there. I guess there are a few people who would watch for you.

73, Stefan

PS: My small LF coil is already here again. Some tests may happen soon. But there are a lot of open projects...




Am 07.09.2016 09:12, schrieb VIGILANT Luis Fernández:

Hi LF

Last night was 5w !!! :-0
Testing an audio amplifier with dissapointing performances

Very interesting spots :-)

73 de Luis
EA5DOM

El 7 sept. 2016 2:18 a. m., Graham <g8fzk@g8fzk.fsnet.co.uk> escribió:

 

100 mW  to  Ae ?  to too  much power  ,  still  3 db left  !

 

73-G, )

 

23:39 136 EA5DOM de G3XDV Op32 Deep Search 915 mi -42 dB in Welwyn 1520.0 Hz with 0.1w + MiniWhip

23:35 136 EA5DOM de EA5DOM Op32 0 mi -1 dB F:2% in Albir - QRP Test 1519,6 Hz with 0.1w + MiniWhip

23:35 136 EA5DOM de EB3FRN Op32 185 mi -35 dB F:7% in Montbrio 1519,9 Hz with 0.1w + MiniWhip

 

From: VIGILANT Luis Fernández

Sent: Monday, September 05, 2016 11:00 AM

To: rsgb_lf_group@blacksheep.org

Subject: RE: LF: EA5DOM LF tests

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

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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

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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