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Old 24th Jan 2021, 10:37 pm   #1
Radio Rob
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Default R1155 Additional N/S Knob to Left of Tuning Knob

Hi All My first post on the forum so I hope I get this right.

While looking around the web for photos to help with my R1155A I came across a colour picture on Wikipedia(Imperial War Museum Photo) showing the Radio operators position. The photo shows an R1155 with a small marconi knob to the left of the serial number plate under the main tuning knob. The Letters N (orM) and S painted above.

The question is what might it be for.

Could it be a heater switch for the D/F valves Navigator or Standard.

Really interesting picture.

Any Ideas
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Old 25th Jan 2021, 1:05 am   #2
dave walsh
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Default Re: R1155 Additional N/S Knob to Left of Tuning Knob

Welcome to the Forum. I'm sorry I can't help you with that Rob but it's a great photo! Thanks for posting. There's nothing near the serial plate on my [unrestored] set so maybe it's a specialised addition? I'm sure there will be lots of expert ideas to follow. You are in the right place

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Old 25th Jan 2021, 1:41 am   #3
rambo1152
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Default Re: R1155 Additional N/S Knob to Left of Tuning Knob

I've seen that picture in many places but only in B&W, so it must have been hand coloured, if not Photoshopped.

I hadn't noticed the extra knob though, quite intriguing. it appears to have two positions N & S so something to do with the DF I guess.

It appears to have had a lot of use, judging by the marks on the panel.
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Old 29th Jan 2021, 4:32 pm   #4
G4YVM David
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Default Re: R1155 Additional N/S Knob to Left of Tuning Knob

That is interesting because it's a rare mod state. Have a look at other images and it's not there. It's not something I have ever seen in real life and I've seen, and owned, a few R1155's! As has been said it certainly seems to have had a lot of use in this particular installation. I'll ask about...
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Old 30th Jan 2021, 3:34 pm   #5
G4YVM David
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Default Re: R1155 Additional N/S Knob to Left of Tuning Knob

I've spoken to Ben Nock and he has never seen it either.
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Old 30th Jan 2021, 3:42 pm   #6
ms660
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Default Re: R1155 Additional N/S Knob to Left of Tuning Knob

I wonder if it's anything to do with a training setup?

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Old 30th Jan 2021, 4:14 pm   #7
turretslug
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Default Re: R1155 Additional N/S Knob to Left of Tuning Knob

As the war progressed, more and more powerful radar pulses were being generated in the locale of bomber formations for ground-mapping and rear-warning- could some R1155s have grown a noise-suppressing circuit in the way that some CR100s did? Random stab-in-the-dark- could 'N' and 'S' be normal and suppressed?
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Old 30th Jan 2021, 4:52 pm   #8
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Default Re: R1155 Additional N/S Knob to Left of Tuning Knob

Sounds a possibility as I guess it wont mean North /South. I have 3 R1155,s but none have the extra knob.

Must information somewhere out there.This has got me searching to no avail as yet.
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Old 30th Jan 2021, 10:55 pm   #9
NottsIan
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Default Re: R1155 Additional N/S Knob to Left of Tuning Knob

Do we know the provenance of the photo? Was it taken during WWII or could it be a more recent mock-up.
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Old 31st Jan 2021, 9:36 am   #10
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Default Re: R1155 Additional N/S Knob to Left of Tuning Knob

Quote:
Originally Posted by NottsIan View Post
Do we know the provenance of the photo?
As it happens, yes.
It appears on the R1155 Wikipedia page.

Description
English: IWM caption : Flying Officer R W Stewart, a wireless operator on board an Avro Lancaster B Mark I of No. 57 Squadron RAF based at Scampton, Lincolnshire, speaking to the pilot from his position in front of the Marconi T1154/R1155 transmitter/receiver set.
Date circa 1943
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Old 31st Jan 2021, 10:16 am   #11
M0FYA Andy
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Default Re: R1155 Additional N/S Knob to Left of Tuning Knob

I'm sure this photograph was thoroughly discussed on here a couple of years ago, with no conclusion.

Can anybody find the thread, I can't?

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Old 2nd Feb 2021, 11:19 am   #12
Ed_Dinning
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Default Re: R1155 Additional N/S Knob to Left of Tuning Knob

Hi Folks, it also appears in the spring 2016 edition of Radio Bygones, P21

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Old 2nd Feb 2021, 4:34 pm   #13
Radio Rob
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Default Re: R1155 Additional N/S Knob to Left of Tuning Knob

Thanks for the replies. I like a mystery. The original source of this photo was the Imperial War museum. I guess it is unlikely that anyone who used this set is still around. It would be nice to solve.
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