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I eventually found it on page 8.20 of the 1969 edition. No mention of it in the index under micro- or wave-
de John G8SEQ
From: John Fell <firstname.lastname@example.org>
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] microwave absorbent adhesive polymer?
Sent: Mar 03 '21 10:57
RSGB VHF Manual - Microwave section .Wood in guide dummy load .
On Wed, 3 Mar 2021 at 10:11, John E. Beech <email@example.com> wrote:
> Don't laugh, but has anyone tried a thin strip of balsa wood or
> plywood for the absorber? ( Perhaps covered in
> graphite pencil lead?) I once made an effective waveguide dummy
> load for 10 GHz out of wood - a specially shaped
> wedge. I don't know where the design came from but I got it from
> G8MWR (SK).
> de John G8SEQ
>> -------Original Message-------
>> From: Neil Smith G4DBN <firstname.lastname@example.org>
>> To: BVAemail@example.com
> <BVAfirstname.lastname@example.org>, UKMicrowaves@groups.io
>> Subject: [UKMicrowaves] microwave absorbent adhesive polymer?
>> Sent: Mar 02 '21 23:27
>> Are there any secret sources of microwave absorbant material
> which will
>> work from 2.5 to 10 GHz with good reflection loss and bulk loss,
>> 1mm thick and self-adhesive?
>> For the F6BVA 3cm to UHF transverters, we need a bit about 150 x
> 50 mm.
>> I see RF Microwave has some at around £330 for a 600 mm square
> sheet of
>> silicone 1mm carbonyl/iron, which makes 48 pieces at around
> £8.50 per
>> piece including VAT etc. The price from Mouser etc for similar
>> works out about the same. Is that the right sort of price or is
>> some low cost magic stuff of which I am unaware? The gap above
> the PCB
>> is only 7mm, and some of the components are a few mm tall, so
> 1/16" or
>> about 1.5 mm is the max I can fit in.
>> Neil G4DBN