The R1155 Communications Receiver

 My first picture shows an example of arguably the most well known piece of radio equipment from WWII and has been extensively modified by a radio ham.

 R1155, with later Type 35 tuning drive


 The R1155 was used in most British military aircraft large enough to carry the weight of the 1154/1155 transmitter/receiver pair and also in some ships and ground installations.

There are several versions of the 1155 receiver listed below:-

1155 Aluminium case, standard receiver

1155A Aluminium cased receiver fitted with filters to prevent medium wave interference to its IF amplifier

1155B as 1155A but with added HF chokes to prevent radar interference

1155C as 1155A but with HF DF modification

1155D Steel cased standard receiver

1155E Steel cased version of 1155A

1155F Steel cased version of 1155B

1155L aluminium cased version of 1155B but with LF range removed and 1.5 to 3MHz range added

1155N steel cased version of 1155L

1155M this is an 1155A but corrosive flux was used in error during manufacture relegating it to ground based use only on account of reliability problems

Although both of my examples have been modified for amateur use the upper example much more so as can be seen by comparing the two.

This involves the addition of an integral mains power supply and various cosmetic type modifications such as covering the power and control "Jones Plugs" connectors at the bottom right with a blanking panel.

Space inside the receiver for the extra parts needed for a mains power supply was often found by removing the integral direction finding circutry.

The front panel is now fitted with different controls and original finish and markings removed, the latter replaced with newly engraved lettering. Sad to see..

The second, an earlier and much more original model is shown below...

To reduce the weight of the R1155 some models use aluminium instead of the standard outer steel case.

Two tuning knobs were provided, one fast and one slow and you will notice that these two examples use different versions of tuning knobs.

Below is a set with the early knobs which was later changed because the operator's gloved hand was prone to inadvertently turn the outer, coarse control when he was adjusting the inner slow motion knob.

 Much to my surprise, when I powered up the old set (it has a lead fitted with a modern 13 amp plug) and connected a loudspeaker and an aerial, the receiver worked extremely well. Thankfully, I hadn't stripped out parts for the earlier example which I refurbished ( see this lower down the page). As the perspex cover was very clouded I removed it and polished out blemishes. I also dealt with the white plastic padding strip which had shrunk (like the perspex cover) by something like 5mm in diameter.

Once the cover had been removed I noticed the last owner had modified the receiver by substituting for the lowest range a new band covering 1.5 to 3.5 MHz (covering Top Band), gluing an inked strip over the original markings.

In removing the dial I had to detach the tuning knobs. I found it quite tricky to re-attach the mechanism because of the way the output fitted the pointer/tuning condenser. There's a spring clip which needs to be pushed in the direction of the the pointer allowing a tiny indentation in a brass fitting to push aside the spring and latch the mechanism. If this isn't done properly the pointer may be forced out of alignment and foul the dial.


 I think I might tidy up the receiver, perhaps by making a new blanking panel, repainting the front and fitting better knobs.


 Below the R1155 with the earlier Type 13 tuning drive

 See how I'm commissioning it for use with a T1154


 This particular example has been modified for ham use but when I removed a blanking panel the two original Jones Plugs were still in place although a headphone socket replaces a smaller original Jones Plug.

The dial was in a very dirty condition but responded to careful cleaning. Rusty steel securing screws are (temporarily) replaced with brass 6BA screws.

I removed a very distorted piece of unsightly, yellowing and much shrunken perspex used for padding the dial edges and replaced it with modern plastic.

I polished the main perspex dial after using various solvents to remove yellowing and scratches.

Frequency coverage for the R1155 is as follows:-

Range 1 18.5MHz to 7.5MHz

Range 2 7.5MHz to 3.0MHz

Range 3 1500KHz to 600KHz

Range 4 500KHz to 200KHz

Range 5 200KHz to 75KHz

The R1155L and R1155N had an extra short wave band; Range 2A 3.0MHz to 1.5MHz, neatly covering Top Band in place of Range 5

 See adverts for government surplus T1154 transmitter and R1155


 Here's my third example, an R1155A


 This example has an aluminium chassis so was likely to have been used in an aircraft, unlike many steel versions.



 Below you can see a modification. A 6V6 output stage with a transformer for driving a loudspeaker and explains the wires emerging from the front. The owner must have used a Jones plug for powering the set. Not a recent mod judging by the resistors.

Also a manufacturer's inspection stamp for Ekco.


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