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: [email protected]
Data: 27-ott-2016 11.40
A: "[email protected]"<[email protected]>
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: [email protected] [mailto:owner-
[email protected]] En nombre de DK7FC
Enviado el: miércoles, 26 de octubre de 2016 19:06
Para: [email protected]
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
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