Monday, October 28, 2013

All has been quite on the R1155 front for a year or two. I have acquired a T1154 transmitter and used the receiver and transmitter together on the VK 40m a.m net. I have just acquired this rather sad example of what I think is an R1155E. The serial number plate is so rusted away I can barely read the serial number which appears to be ?0423. Anyway, it will give a good chance to go through the book again to check for errors.

Thursday, February 3, 2011


Rebuilding my second receiver using my book as a guide I found some errors as listed in earlier posts. Also some of the instructions were a bit unclear. I have revised the text in a few places, included all the corrections listed below spotted by readers and myself. I have also added some additional debugging information that may prove helpful. This is largely just additional measurements of the HT+ to ground and HT- to ground resistance values that change with different positions of the Master Switch AND Band Switch.

The price remains exactly the same despite the rising Aussie dollar. The cost is £34.30 inc post and packing to the UK from Australia. I accept payment by PayPal.

Contact me at:

p dot holtham at uqconnect dot net

Here's No2. Note the white lettered labels, these have been redone using white decal (water slide transfer)paper, printing white letters (no ink) on a black background.

Some corrections from rebuilding No 2

I have just finished rebuilding a second R1155B. It is now working successfully as a communications and DF receiver. But in the course of rebuilding I found a couple of errors still lingering.

The first is a missing wire from the bias tag board to V8 pin 6, here is the corrected page.

Then I missed a resistor R22 on the base of V8 from pin 6 to pin 8. Here it is:

Finally, one of my earlier corrections is wrong. I had the two wires from capacitors C23 and C24 on the end of the coil box going to the bias tag board. They should have gone to the 9-way tag board pins 8 and 9 as shown here.

Thursday, November 25, 2010

Corrections on Corrections

Another reader has pointed out mistakes. Thanks Tor.

In the entry below referring to Missing Capacitors C108 & C25, the text is correct but the drawing is wrong. C25 is shown on pin 3 of V9, it should be pin 3 of V8.

In the entry referring to C23, C24 and C7, R65 (10k) should be connected to pin 5 NOT pin 4 of V9.

I am rebuilding another R1155 using the book and I hope this process will eliminate the final problems.

Thursday, June 17, 2010

Another minor correction

Again a reader spots a small problem. Thanks to Chris for pointing this one out. The wiring schedule for S4 on p96 doesn't quite match the drawing below. The drawing is right regarding the destination of wires from tags 3 and 4 of S4 (Het On). The schedule has them swapped. Below is the corrected schedule.

Monday, April 5, 2010

R1155 Restoration Guide - Second Edition

The R1155 Receiver Restoration Guide is now available in a second edition, with the errors listed below corrected in the text and diagrams.

The price remains the same, £20.00 plus airmail post and packing from Australia.

Note: if you have a R1155L or N model, the Guide will help, but in these models there are differences in the coil box wiring because of the different frequency ranges, so you will need to work out your own coil box wiring. The rest of the circuitry is the same. If anyone wants to give me an L or N, I will do the necessary work and add some extra pages!

If you are uncertain whether the guide will be of value to you, check Ian's blog: for a users viewpoint.

Order from:

p dot holtham at uqconnect dot net

by turning the above into a normal email address. I accept payment by PayPal to this address.

L3 tag positions

L3 in the coil box is the only coil with 6 tags. As shown on pages 64-68, the alignment of the tags is about 30 degrees out with how they actually mounted. Probably because I just did a copy and paste from L2 and added two more tags.

The diagram below shows the tag numbering that corresponds more closely with the physical arrangement. There is no problem with any of the wiring diagrams, it just might be easier to locate each pin on the modified diagram.