From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= <luis@vigilant.es>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: RE: ULF: A new step on the large ULF coil...
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Date: Fri, 28 Oct 2016 08:14:41 +0000
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Subject: RE: RE: ULF: A new step on the large ULF coil...
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Ciao Marco, LF

Thank you for the reports. It is nice to be on air again in MF !

The PA current is 5A@14V, so no more than 70w to antenna. But here the antenna is made by a 11m vertical + top cap
top loaded and top feeded in the terrace of 80m height buiding tower. The ground side of the PA runs down to
ground those 80m and is part of the antenna, running just corrent, not high voltage. This is almost what
Rik ON7YD describes here  http://www.strobbe.eu/on7yd/136ant/#IndTop

Noted some problems with the current protection circuit which triggered at 23utc. From that time to about 5utc
I was running just 500mW from U3 bypassing the PA. BTW, I keep transmitting during daytime. Looks like last
Winter, when I could get decodes at daylight from some stations at Germany and the UK

Pity I still don't have a proper transverter to work JT9. But will try to join the QRSS and CW party next days

73 de Luis
EA5DOM

 
-----Mensaje original-----
De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de marcocadeddu@tin.it
Enviado el: jueves, 27 de octubre de 2016 22:22
Para: rsgb_lf_group@blacksheep.org
Asunto: R: RE: ULF: A new step on the large ULF coil...


Hola Luis,

tonight you are booming on 630m wspr!
I don't remember if this is the first time I listen to you, but is really a booming signal abeit the distance.
Unfortunately bad
copy from Stefan (or better optimum if he's running qrp) if the stated power is correct

GL
Marco IK1HSS
 
----Messaggio originale----
Da: luis@vigilant.es
Data: 27-ott-2016 11.40
A: "rsgb_lf_group@blacksheep.org"<rsgb_lf_group@blacksheep.org>
Ogg: RE: ULF: A new step on the large ULF coil...

Amazing work Stefan !! :-O

I bet you have constructed some kind of support (like a lathe) which 
lets you rotate the pipe easily and wound the coils . Right ?
This is getting really heavy and the quality of coils looks very nice 
and repeteable ...... at least five times ! ;-)

Dumb question: Why do you get different inductance values when 
resonating it with antenna equivalent capacitor and when measuring 
current at 273V AC / 50Hz  ??
Shouldn't be inductance a constant value ? ...... or I'm missing 
something obvious :(

Good luck with the 6th floor. Seems that there is no room for a 7th, so 
that's why you mentioned the variometer

73 de Luis
EA5DOM

________________________________
De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-
rsgb_lf_group@blacksheep.org] En nombre de DK7FC
Enviado el: miércoles, 26 de octubre de 2016 19:06
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: ULF: A new step on the large ULF coil...

Hi ULF,

It's just a few weeks ago, now the 5th stack is wound on the coil: https://dl.dropboxusercontent.com/u/19882028/ULF/20161026_185804.jpg

The DC resistance rose from 445 Ohm to 572 Ohm.
The measured resonance frequency (using the antenna equivalent C in 
the shack) dropped from 3.667 kHz down to 3.208 kHz. That should be 
about 4.92 H.
Measured at 273V AC / 50 Hz, i'm getting 197 mA, so the actual 
inductance is 4.0 H.

A 6th stack and a variometer part is needed!

73, Stefan