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Re: LF: Re: 23:35 477 EA5DOM de EB3FRN Op8 Deep Search -36 dB1489.0 Hz

To: [email protected]
Subject: Re: LF: Re: 23:35 477 EA5DOM de EB3FRN Op8 Deep Search -36 dB1489.0 Hz
From: DK7FC <[email protected]>
Date: Wed, 30 Sep 2015 13:25:08 +0200
In-reply-to: <[email protected]cal>
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Hi Luis.

What is the loop RF current and the loop area? Do you know it?
Is it problematic to match the loop? You just need a C and a ferrite transformer. If you have such a relatively high perimeter, you probably need about 1 nF to resonate it? Currents may be in the range of 10A at 100W? A bandwidth of maybe 3 kHz?

73, Stefan

Am 30.09.2015 11:14, schrieb VIGILANT Luis Fernández:
Hi MF
 
Probably not 2mW ERP Stefan ;-)
 
Have to reconfigure my U3 but really don't know which ERP I'm getting right now
The PA outputs 60V RMS under 50Ohm load, but the loop is not an ideal load and I can tune it
to about 80V RMS. When detuned, RMS runs up to >>100V and PA gets into problems
 
I tried to get loop performance using Andy G4JNT excel and this is what I got
 
Probably many things wrong there
What I use is a 70m perimeter loop made from RG59 coax (braid and inner shorted on ends) but not a round circle
The resonate cap is very close to what I need to tuneit. So the "equivalent" round loop diameter should be 21m 
Go figure ! :-)
 
One detail to mention:
Yesterday, it rained. Not very usual here and still not tested the loop with this Tx power and with wet terrace
It seems to me that my signals was better than before. Could the wet terrace worked as a kind of reflector or
re-shapped the radiation diagram of the horizontal loop making it more efficient for Dx ??
 
The loop is not equidistant from terrace but keeps about 3 to 4 meter high, and just 1m on the feeding point
 
73 de Luis
EA5DOM


De: [email protected] [mailto:[email protected]] En nombre de DK7FC
Enviado el: miércoles, 30 de septiembre de 2015 10:18
Para: [email protected]
Asunto: Re: LF: Re: 23:35 477 EA5DOM de EB3FRN Op8 Deep Search -36 dB1489.0 Hz

Hi Luis,

Ooh, very well! I'm glad that i received you the first time! Is it really 2 mW ERP?
Oh and BTW it was in WSPR, the super mode!!!! ;-)

73, Stefan

Am 30.09.2015 00:17, schrieb VIGILANT Luis Fernández:
Even with the loop we are on the way ;-)

 2015-09-29 22:00   EA5DOM   0.475611   -27   0   IM98wn   0.002   DK7FC/P   JN49ik   1398   27 

73 de Luis
EA5DOM

De: [email protected] [[email protected]] en nombre de DK7FC [[email protected]]
Enviado: lunes, 28 de septiembre de 2015 21:47
Para: [email protected]
Asunto: Re: LF: Re: 23:35 477 EA5DOM de EB3FRN Op8 Deep Search -36 dB1489.0 Hz


Am 28.09.2015 17:02, schrieb VIGILANT Luis Fernández:
[...]
 
Next in the list is going vertical. Coil and variometer on the way. Keep tuned ;-)
 
73 de Luis
EA5DOM


Oh yes! Do it!!! :-) Looking forward to a QSO :-)

73, Stefan
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