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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 2nd Nov 2021, 7:44 pm   #1
vorfaeaberdeen
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Default Canadian Staff Car Receiver R103 MK1

I have just got myself a receiver R103 MK1. As this set was made for use in staff cars am I right in thinking that in keeping with the vehicles of the time the set uses positive for earthing the case and neutral for the power supply?
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Old 2nd Nov 2021, 8:08 pm   #2
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Default Re: Canadian Staff Car Receiver R103 MK1

Hello and welcome to the forums.

I've just checked the circuit in Wireless For The Warrior Vol 3. It just shows a 12V battery connection with no indication of polarity. I don't think it matters as long as you keep the polarity the same as that of the vehicle it's installed in. That way if the receiver's case touches the vehicle's metalwork there won't be a flash and a bang.

One side of the battery is connected to the receiver's chassis and the other feeds the heaters via a 10A fuse and a high power dropper resistor. There's also a connection to the vibrator from which HT is derived.
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Old 2nd Nov 2021, 8:14 pm   #3
vorfaeaberdeen
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Default Re: Canadian Staff Car Receiver R103 MK1

Hi thank you for that. All the replies I got on the military vehicle forums seemed to think that it was made to operate on 6 volts.
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Old 2nd Nov 2021, 8:24 pm   #4
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Default Re: Canadian Staff Car Receiver R103 MK1

This receiver uses a separate power supply unit (PSU) which I assume you have? WFTW suggests that although a 6V power supply was designed, none were ever manufactured.
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Old 2nd Nov 2021, 8:31 pm   #5
vorfaeaberdeen
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Default Re: Canadian Staff Car Receiver R103 MK1

No I don't have one, just the set and antenna. The vehicle forums were all under the impression that it was just powered straight from the vehicle wiring loom. It's a hard set to find any vehicle mounting details on line.
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Old 2nd Nov 2021, 8:36 pm   #6
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Default Re: Canadian Staff Car Receiver R103 MK1

The PSU which is powered from a 12V battery also incorporates the loudspeaker. It connects to the receiver using a 4 way cable.

If you plan to have this working you'll need to build a PSU of some kind which need not be of the same design as the original.

Brief mounting details for Humber saloon staff cars are given in WFTW along with a full circuit diagram, alignment instructions etc.
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Old 2nd Nov 2021, 8:45 pm   #7
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Default Re: Canadian Staff Car Receiver R103 MK1

As you were!

The Canadian version has a built in power supply and speaker; and is powered from 6V. No polarity indicated though, so what I said previously applies.

You obviously won't be powering it from a 12V vehicle battery though.

I reckon you'll be lucky if the vibrator is still working.
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Old 3rd Nov 2021, 11:48 am   #8
vorfaeaberdeen
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Default Re: Canadian Staff Car Receiver R103 MK1

Thank you very much for all your help, It's OK my staff car is still 6 volts.
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Old 3rd Nov 2021, 1:03 pm   #9
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Default Re: Canadian Staff Car Receiver R103 MK1

I was taking a look at this R103 RX. I'd not seen one before but it's a bit confusing-at least to me. There seems to be an earlier square version with a bulbous tuning dial [circa 1941] and a later slim line grey box [1943?]. The grey box is described as covering 1-16 megs The bulbous box Mk1 [1-7.5 megs]. The bulbous box is also described as a Mark 2 [Ii]. One site describes a grey box as a Mk1 but from 1944. There seems to be only the two case shapes for three types. Does this confusion arise because of UK and Canadian versions I wonder Which set is your MK1 vorfae?

Cheers,

Dave W
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Old 3rd Nov 2021, 1:26 pm   #10
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Default Re: Canadian Staff Car Receiver R103 MK1

Two pictures from WFTW Vol 3 showing the Canadian model.

Coverage 1-16MHz in three wavebands.

1.0-2.6MHz.
2.5-7.0MHz
6.0-16.0MHz.

------------------

The UK R103 MK1 and 2 sets were similar to each other and differed in detail only.

The UK R103A was a redesign with a built in PSU.

Perhaps the OP could post some pictures of his set?
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Old 3rd Nov 2021, 2:24 pm   #11
G4XWDJim
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Default Re: Canadian Staff Car Receiver R103 MK1

Here are some pictures of a DEIL Canadian R103 I repaired for a friend about 30 years ago or maybe more. They were taken originally on a film camera. It worked pretty well on its Loctal valves.It's a bit scruffy but does show the inside. I never had a circuit and can't remember whether it was 6 or 12 volt. I opened the vibrator up, cleaned the contacts and it worked ok. A few resistors and the minimum number of capacitors and away it went.
Very easy to align.

The owner fitted it into a large Woodie wartime car. I don't think I ever saw the aerial he used.

This site shows some clearer pictures.

https://www.royalsignals.org.uk/photos/r103/r103.htm

Hope this helps

Jim
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Old 4th Nov 2021, 8:48 am   #12
M0SOE_Bruce
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Default Re: Canadian Staff Car Receiver R103 MK1

The vibrator in my set is a Mallory 672C. it is 6V non-synchronous so polarity shouldn't matter. One side of battery is connected to chassis along with the valve filaments. The power and aerial connectors are either Amphenol or Switchcraft mic connectors that were popular in the 1940s & 50s.
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Old 5th Nov 2021, 10:36 am   #13
vorfaeaberdeen
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Default Re: Canadian Staff Car Receiver R103 MK1

This is the set I have
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