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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 27th Sep 2017, 9:47 am   #1
M0FYA Andy
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Default SIR101 - what is it?

Cryptic question time, folks!

I have a metal box, I suspect WW2 era, labelled 'Cases Minor Spares' with an Army Reference number ZC 18412. It also has an ID plate written in what I guess is Russian.

It contains spare valves and an ACR10 CRT. There are a couple of vacant spaces, one labelled CV100, which is a trigatron, and one difficult to read as it's been covered by a small paper label, also in Russian.

The trigatron points to the spares being for a Radar of some sort.

I think the writing under the paper label says 'SIR101 OSC'.

Googling suggests SIR might be 'Stepped Impedance Resonator', something I'm not familiar with, but then it could be something completely different.

Can anyone suggest what system the spares are for, and what the missing SIR101 OSC might be?

Many thanks,

Andy
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Old 28th Sep 2017, 9:32 am   #2
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Question Re: SIR101 - what is it?

'SIR': Surveillance Intercept Radar?
The 'OSC' presumably stands for 'oscillator'.

Al.
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Old 28th Sep 2017, 9:39 am   #3
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Default Re: SIR101 - what is it?

Is this perhaps the same item?

https://www.worthpoint.com/worthoped...-air-424760156

The Russian script translates literally as "Box small spare parts", so no clue there.
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Old 28th Sep 2017, 10:00 am   #4
M0FYA Andy
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Default Re: SIR101 - what is it?

Graham, that's amazing, the very item! I'm guessing I must have bought it maybe two or three years ago, I can't remember just when. How did you find that link?

Al, anything's possible, although I would have thought SIR would stand for something to do with the missing component as opposed to the overall system. I agree OSC is likely to be short for 'oscillator'.

Andy
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Old 28th Sep 2017, 10:09 am   #5
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Default Re: SIR101 - what is it?

Quote:
Originally Posted by M0FYA Andy View Post
How did you find that link?

Andy
I just googled the ZC code.

Is there any other Russian writing on it?
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Old 28th Sep 2017, 10:19 am   #6
M0FYA Andy
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Default Re: SIR101 - what is it?

There's something on the paper label stuck over the SIR101 marking. I'll see if I can get a picture of it.
I don't know how much equipment was supplied to Russia? I guess we've all seen examples of the (Canadian) 19 Sets with Russian markings, but I would have thought radar to be a bit too sensitive at that time.
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Old 28th Sep 2017, 10:39 am   #7
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Default Re: SIR101 - what is it?

Not sure if this is anything to do with it...Gun laying radar, some GL Mk11 units were sent to Russia and some GL MK111 units were too according to these two Wiki articles, not had chance to research further to confirm anything either way (Mk11 mentioned in the Mk1 article):

https://en.wikipedia.org/wiki/GL_Mk._I_radar

https://en.wikipedia.org/wiki/GL_Mk._III_radar

EDIT: Apparently the display tubes were 5" or 6" so not the same as Andy has, never mind, there may still be some kind of connection somewhere.

Lawrence.

Last edited by ms660; 28th Sep 2017 at 11:00 am.
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Old 28th Sep 2017, 1:54 pm   #8
M0FYA Andy
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Default Re: SIR101 - what is it?

Lawrence, yes, quite possibly associated.
Given my box is labelled 'Minor Spares', I guess there may have been one labelled 'Major Spares' for bigger things including 5" or 6" tubes!
Andy
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