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HR1BY > TECH 08.12.05 19:50l 35 Lines 1384 Bytes #999 (0) @ WW
BID : 481851HR1BY
Read: DL1LCA GUEST OE7FMI
Subj: Re: Wanted Info On Making Variable Capacitors
Path: DB0FHN<DB0MRW<OK0PKL<OK0PCC<SR6BBA<SR1BSZ<CE8FGC<HR1FBB<HR1PAQ
Sent: 051208/1738Z @:HR1PAQ.#TGU.HND.CEAM #:14438 [Tegucigalpa] FBB7.00i $:4818
From: HR1BY@HR1PAQ.#TGU.HND.CEAM
To : TECH@WW
> G6OHM wrote:-
>> the nose and buy one.
>> The reason for asking is i am thinking of building a magnetic loop for
>> 80m or 160m and i know the caps need to be wide spaced to be able to take
>> the power upto 100w.I also know they are expensive to buy.
>> So if you can help with info or web site please drop me a line to :
>> Andy G6OHM @ GB7HOL
> =========================
> It is not a new idea : Instead of rotating plates ,why not sliding pieces
> of double sided PCB in between fixed plates by means of an electric screw
> driver rotating a threaded spindle in a nut . The package of sliding
> plates being kept apart from the stationary plates by means of grooved
> polystyrene spacers. It was done by a PA station operator for an 80 -40 m
> magnetic loop.
>
> 73 - Frank , GM0CSZ @ GB7NOS.#76.GBR.EU
> Inver by Tain , IV20 1RX Scotland UK Loc: IO87AT
Why don't you use some sliding piezes of Coax inside a Copper-Tube, form a
"U" and move it in and out for varying capacity?
I did it with my 80 to 15 meter Magnetic-Square (not a round Loop in my
case), it is working fine! The moving is in and out via a very long screw
from a little motor with reduction-gear.
Have fun!
Season Greetings to all of You!
73 - WOLF, HR1BY @ HR1PAQ
Message timed: 11:13 on 2005-Dec-08
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