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May 5th 04, 03:28 PM

On Wed, 05 May 2004 01:04:49 GMT, (John Crighton)
wrote:

Your connector is very similar but just slightly different.
When you contact AVO at Dover, ask them the name
of the RF connector that was used. Telling them it is
similar to a Pye should jog their memories.

Okay, I've just phoned them and drew the anticipated blank, I'm
afraid. It appears all the old info; manuals, spec sheets, data etc.
on all obsolete models got thrown out years ago. They only keep info
on current models, regrettably. Still, at least they didn't try to
sell me a new one.

If you are a purist
and you want to keep the original RF output connector then
you can find some at Ham radio trash and treasure field days
or if you are in a hurry, check out some radio service workshops,
like taxi two-way radio repair joints. Most technicians are horders
of old stuff. They might have an old lead with connector.

I think the obvious thing to do from my PoV is just to leave the front
as is for the sake of originality and just put a BNC socket at the
rear and feed the mains power in via a grommeted hole likewise at the
back. Having a dirty great power lead coming into the front panel
would have looked pretty gross anyway.

If you are not a purist
in keeping old gear original but only functional, open the unit
up and see if the old fashioned RF output connector can be
replaced with a BNC connector easily.

In the 1950s? I'd certainly have thought so!

You still haven't told me what ohm meter readings you got
when you placed the meter prods from inner to outer on the
RF connector. (sig gen switched off)
Flick the attenuator switches to all positions. You are looking
for fairly consistent readings to check if the attenuator has
been damaged by a transceiver that transmitted accidentally
or the attenuator having being connected to a high DC voltage.

Tell us. Were the readings close to 50, 75 ohms or what?

70-100 ohms depending on the positions of the coarse and fine
attenuator knobs, but not nice and smoothly; jumping around a lot (I
guess noisy pots that just want a squirt of contact lube. Does that
sound right to you? I'd have expected a much greater range...

[rest noted and snipped]
--

The BBC: licenced at public expense to spread lies.

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