Wave guide dummy load.


John E. Beech
 

Tnx John,
I eventually found it on page 8.20 of the 1969 edition. No mention of it in the index under micro- or wave-
though.

de John G8SEQ

-------Original Message-------
From: John Fell <john.g0api@gmail.com>
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 .

John
G0API

On Wed, 3 Mar 2021 at 10:11, John E. Beech <john@g8seq.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 <neil@g4dbn.uk>
>> To: BVA-transverters-uk@groups.io
> <BVA-transverters-uk@groups.io>, UKMicrowaves@groups.io
> <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,
> around
>> 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
> stuff
>> works out about the same. Is that the right sort of price or is
> there
>> 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
>>
>>
>>
>>
>>
>>

Join UKMicrowaves@groups.io to automatically receive all group messages.