Comprehensive Headset Tester (RAF / RN)

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scott
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Comprehensive Headset Tester (RAF / RN)

Post by scott »

Hi all,

A year or two ago I acquired an ex-RAF "Comprehensive Headset Tester - 21 A 200/1" made by RACAL / S.G. Brown Comms Ltd, with an aim to restore to full operation for use. It's effectively a white dummy head mounted on a box of electronics. The head has microphones for ears for headphone testing, and a speaker for a mouth for microphone testing. You plug the helmet / headset into the box of electronics and can simulate human interaction via screeching noises. I picked up from another forum these got nicnamed the 'Screaming Skull'!

Tester Ref. No.: 10S/6625-99-620-0369

I think this tester is from the late 70's / early 80's judging by the technology inside, and really hope there may be some documentation somewhere.

Basically I need to locate an instruction manual for how to use this unit to perform headset tests. Specifically as there are a set of decade switches where codes relating to specific microphones and headphones are set, but I am lacking the reference material to know how to set it up. These code switches are on the right side of the control panel above the manufacturers data plate, labelled "MIC" and "REC".

(photos to follow, phone is playing up)

Cheers, Scott
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will45
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Re: Comprehensive Headset Tester (RAF / RN)

Post by will45 »

Hello Scott,

This is an installation manual for a 21A & 21C 100/1, but how much commonality with the 200/1 is the question.


https://www.ebay.es/itm/S-G-Brown-LTD-H ... Sw6xVcZCug


Cheers, Willie.
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scott
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Re: Comprehensive Headset Tester (RAF / RN)

Post by scott »

Thanks Willie, I'll check that out! I have no idea if there's a major difference between the two types what it would be.

Here are the photos pre-restoration.
20161113_093711.jpg
20161113_093703.jpg
I had been after one of these for about 20 years, and had only ever seen one other in the Cattle Market military surplus store in Nottingham UK all those years ago when I was a kid just a little older than 10, guess the are a fairly rare beast.

Cheers, Scott.
Mark O
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Re: Comprehensive Headset Tester (RAF / RN)

Post by Mark O »

Hi Scott, I came across your query on this item as I am looking for a suitable replacement as they are still in service with the MoD. I do know that these were repaired by http://www.allied-aerosystems.co.uk/ and also https://www.dplusm.co.uk/.

There is also an Air Publication AP 117L-0402-13 for this equipment but you would have to ask the MoD to see if they would release a copy.

I also found this site which may be of interest too which depicts the Index to Radio Publications for MoD.

https://www.blunham.com/Radar/SignalsMu ... oIndex.pdf

Kind Regards,

Mark
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scott
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Re: Comprehensive Headset Tester (RAF / RN)

Post by scott »

Hi Mark,

Thank you so much for your leads there, I have tried contacting those companies for some assistance in the hope that something comes of it.

in looking for a modern alternative, I have seen there are plenty out there for domestic headphones, but I guess a device like this set up for UK RAF / RN headsets is quite specialised.

One avenue you may look down though, the French Air Force (in general) uses the same NATO plug as the UK, and also historically have shared the same headset impedances. While some aircraft will have some oddball specific requirements and unique connectors, there may be sonething in use in France that could be compatible... Just a thought.

Cheers, Scott
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