Thanks to all that sent sensible info about the subject....Cheers Dave
Ian Ashford <[EMAIL PROTECTED]> wrote:
Dave.
I have a couple of beer barrel resonators made in England by Aerial
facilities ltd (Now gridcom) :
A brand new barrel is silver plated then painted in grey etch primer/ gloss
The old stainless -steel pickup tube and mounting plate is removed and
replaced by a silver-plated variable length plunger of diameter 2 1/2"
(It has to be this size because a beer barrel is quite "fat" and the Zo has
to be about 70 ohm)
The plunger is made of moving and fixed sections connected via a ring of
fingerstock.
An invar rod couples the moving plunger to the top locking collar which is
part of the toplate.
Two "n" connectors with 10 guage silver plated copper loops are fitted
either side of the plunger.
I have 70dB notch and 1dB insertion at 145.6/145.0 per cavity in
antiresonant mode.
My conclusion on Beerbarrels is that they perform well but are difficult to
mount into a rack and
a four barrel duplexer is too bulky.
However they are cheap and fun to work with...
Try "Nu-Swift" fire extinguishers on 70cm also.
Ian
G8PWE
www.gb3dx.com
Subject: [Repeater-Builder] Cavity filters from aluminium beer barrels ?
> Hi, Has anyone used beer barrels to make cavity filters ?
> Any info/designs would be useful.....Cheers Dave
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