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T-368 Variants - Spotter's Guide?




 
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W1RC
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« on: June 28, 2017, 10:07:55 PM »

I would like to compile a "spotter's guide" to the T-368 and its variants.

The manual set I have indicates there are the following

T-358/URT
T-368A/URT
T-368B/URT
T-368C/URT

In addition there are the following variants:
T-368D/URT
T-368E/URT
T-368F/URT (I have never seen this variant documented except my T3's id tag says it is an F model.........

The manual set consists of:

Instruction book for Radio Transmitter T-368/URT.  The manual written my the manufacturer which was delivered with the first batch and used as a basis for,drafting the official TM11 manuals.  (in my library)
TM11-809 April 1955 The original "all-in-one" manual.  .pdf in the BAMA archives.
TM11-809-10 May 1958 Operators Manual (in my library)
TM11-809-20 July 1958 (.pdf in the BAMA archives.)
TM11-809-25 December 1958 Field and Depot Maintenance (in my library)
(Supplement C2 dated 6 December 1960 has schematics for the D and E variants)

You can download the manuals in the BAMA archives here:

http://bama.edebris.com/manuals/military/t368/

But the main point of this discussion is: How do you identify the variants especially the Modulator and Power Supply decks?  Only the RF deck has a metal tag and as delivered the transmitters were most likely all the same variant.  However in the world of depot repair, as witnessed with the R-390 and R-390A, the modules were interchangeable and many of the radios have mixed modules made by various manufacturers.  However each of the modules have an indication. Of the contractor who made them and a contract number. 

It might be an interesting exercise to see if together we can compile a definitive guide to the six variants of the T-368 by,chronicling the differences between the different variants.

Also if this has not already been done, let's see if we can compile a list of the different contractors, contract numbers and dates they were made.

My RF deck is a T368F serial number 106 made by TRW, Inc in Camden NJ Order number  14527(E)

Ross' is a T368C.  His is serial number 581, made by Crosley Div Avco Mfg Order No. 21316-PH-56

Here are a couple of excellent information pages on the T-368:

http://www.radioblvd.com/T368.htm

Bruce, W1UJR, had a great web page on the T-368 but it seems to have vanished into,thin air.  Wonder what happened to all that great material?  Did anyone capture it?

73,

MrMike, W1RC



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« Reply #1 on: June 28, 2017, 11:20:44 PM »

https://web.archive.org/web/20070213154349/http://www.w1ujr.net:80/t368.htm

T-368 archive from W1UJR
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W6TOM
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« Reply #2 on: June 29, 2017, 12:38:51 AM »

  My T-368 is an E Model according to the date plate on the RF Deck, it also has the vacuum RF relay, another indication it is a late Model.

  The power supply module has sealed relays which is supposed to be a late model indication. The plate relay is bad, it sticks, these were NOT intended for AM PTT operation. It has been down for a year or so due to that, I plan to replace the relay with a mercury wetted contactor at some point.

  The modulator module is probably older, it has slot head screws, the other modules have philips head screws.

   I haven't had to do a lot for work on my T-368 but from previous experience, my ART-13's, I have two, the military documentation is not very good. The documentation I have show significant variations and I doubt that it is all documented.


* DataPlate.JPG (71.43 KB, 1024x378 - viewed 37 times.)

* Relays.JPG (136.58 KB, 1024x630 - viewed 37 times.)

* T-368 Test.JPG (273.31 KB, 768x1024 - viewed 72 times.)
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Todd, KA1KAQ
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« Reply #3 on: June 29, 2017, 02:19:30 PM »

The place to get a lot of answers would probably be the T-368 group on yahoo. Joe Foley runs the list, can't remember his call right now but I think he got the last complete T-368 out of Fair Radio in the late 90s and has quite a story about the trip there and back from the Binghamton, NY area.

Here's my Stromberg-Carlson D tag. No idea if these got switched during depot maintenance like R-390 tags did, you'd think not if there are significant difference in the models.


* Tag.JPG (365.03 KB, 1469x976 - viewed 26 times.)
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W6TOM
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« Reply #4 on: June 29, 2017, 10:03:58 PM »

  I know of 5 of these transmitters in California, including the one I own and 1 in Northern Nevada.
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WBear2GCR
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« Reply #5 on: July 03, 2017, 06:46:30 PM »

I think that the earliest power transformer had a dual primary, so in theory could be run on 240 or 120, or 220 and 110, depending
on your viewpoint and vintage.

                               _-_-bear
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_-_- bear WB2GCR                   http://www.bearlabs.com
K6IC
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« Reply #6 on: July 05, 2017, 08:16:29 PM »

  I know of 5 of these transmitters in California, including the one I own and 1 in Northern Nevada.

Hi Tom,

K6 and W6IRD do still use a T-3.

And then there was K6RAR Robert's.   It seemed possible that you might have wound up with his (he has since moved to FL) ...   just guessing.

Would bet that there are a number of T-3s in shacks,  garages,  barns,  etc,   that never get on the air.

Seems like there are about two of them here  --  neither seems quite operational.

About six years ago,   after pouring over the T-3 manuals here,   it seemed that there were three,   slightly different secondary voltages,   and as bear mentioned,  think that one had a 115/230 primary.

Mike  thanks for  your work or the sleuthing out the  T-3 owners and  Spotter's Guide.

FWIW,   73   Good Luck
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W6TOM
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« Reply #7 on: July 05, 2017, 09:56:52 PM »

  Vic,

           I now know of Seven T-368 transmitters here in CA, that includes the IRD's. Robert, K6RAR, parted out the one he had, it was rough, had been stored in a barn in Alabama, I have the three draws but not the cabinet, to large.

           Of the Seven here in CA I know of two, including mine, are down for issues but have been on the air over the last few years, there is one other functioning T-368 in Northern Nevada.

                                     Tom
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