Wireless Set No. 52 Canadian - Project

[cmp truck]

Colin,
You have to buy a subscription to these archives.
Do you have a subscription and do you find it valuable?
The obvious usage would be material on vehicles and radios especially manuals and technical orders.
Regards,
Ian
VA6SSV

[Bruce MacMillan]

You don't need a subscription to browse the files. The subscription gives you a search function. I did buy a month's worth of time to see if was worth it but their indexing isn't very good. Colin's link has a lot of wireless info and if you're insomniac there's almost 6000 pages in that file to go through. That is only one of several hundred files. Some of it is interesting.

There is also info in these files on military vehicle design & procurement.

[Colin Alford]

Ian,

As Bruce mentioned, you do not require a subscription to view the files.

The subscription contributes to the project of digitizing the files and hosting them on-line and it allows for full text searching of those files which have this function enabled. Unfortunately so far none of the military files have the text searching function enabled.

I do not have a subscription and I find the information available extremely valuable. The problem is that it takes a long time to find the files that are of interest and then a very long time to click through and read each of the images to discover the information.

Colin

[David Dunlop]

Ian, I would be quite surprised to find manuals and that sort of material in this 52-Set file. It is basically a correspondence file holding the letters and telegrams etc that dealt with design, production and supply issues of the set. And as Colin and Bruce pointed out, it is a huge file with no sort capability.

I did notice a chronological order to a section I poked into but that may not relate to the entire file, just the small block I happened to be looking at perhaps.

As luck would have it, the topic of discussion happened to be the failure of the dynamotors. Only 10% of a very large sample had failed outright and it was determined not to have been overheating. They had narrowed the problem down to a significant fluctuation in the 12 volt input voltage which the dynamotors could not handle over prolonged periods. Efforts were being made to divert sets from a pending shipment to the Canadian Army to Marconi so they could investigate further, regarding this voltage instability. The Marconi address was odd. Possibly the operation in England.

David

[David Dunlop]

Well, enough rest and relaxation. I have stepped away from this project long enough.

I have been able to confirm the dead 12 Volt vibrator in the ZE-11 Remote Supply, although a Marconi product, is the wrong model for this supply. On the bright side, however, a couple of NOS, correct, original Marconi vibrators have been located, so with luck I can see what the DC side of this supply unit behaves like shortly.

I have also ordered a pair of NOS OZ4A rectifiers, so I can have another go at getting the AC side sorted out.

David

[David Dunlop]

The new OZ4A’s and rectifiers arrived in this morning’s Post, so some renewed testing of the remote supply will be on the agenda this weekend. Good thing, as +37 outside is simply not my cup of tea!

David

[David Dunlop]

Well, I ran some more testing on the weekend.

The good news is that, based on a modern input voltage of 120 Volts AC, everything in the Remote Supply up to and including the new OZ4A is doing exactly what it should be. Theoretical calculations match real time results.

On the down side, the HT output at the Jones Socket is running too high. A small part of that problem lies in the fact the wartime test specs are based on an input voltage of 115 Volts AC, which automatically produces slightly lower numbers down the line.

Looks like I am going to have to go in and measure the voltage above and below each remaining component in the circuit ( four caps and two coils ). Then compare those real results to the calculated results of each component, based on their individual specs.

David