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Motorola Transistorized Car Telephone
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Motorola Transistorized Car Telephone
Standard: Improved Mobile Telephone Service ( IMTS )
Factory Code: TCN6070A
Notes: The MJ Standard Control Head
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The MJ Standard Control Head
The MJ system employed a standard control head design,
developed and manufactured by Secode, all
of which were labeled ITT inside and then labeled with the appropriate
manufacturer's logo on the outside faceplate, such as Motorola, GE, Bell System, left blank, or
with a generic logo saying "Radio Telephone" (see example below.)
The control head is interchangeable among all manufacturers of the equipment,
even though the actual radio packages differ greatly. The cables for
the assorted brands of "MJ" equipment are also all interchangeable, so
that a GE head and cable will work perfectly on a Motorola RF package, and vice
There were two versions of this control head. This one went with the TLD-1220 radio drawer assembly, and is called the revertive call radio. This refers to the ability of two mobiles to talk to each other on the same channel by each pressing the "P" button to the left of the lamps. This shuts off the mobile transmitter and the transmitter is then in push-to-talk mode. The non-revertive radio package (TLD-1100) has a button marked "Aux" instead of "P" which will blow the vehicle horn when the mobile phone rings with a call. In some systems these heads were found with UHF channel designators on the buttons and connected to a Pulsar drawer. In which case there were only 11 of 12 channels available. Note: The radio drawer for these heads is not really fully transistorized, there are still a few tubes in the transmitter power amplifier.
It has been asked what the switch on the handset is for. This is the push to talk switch for when the phone is in the Manual, MTS mode, or when sharing the same channel talking with another mobile after depressing the "P" (Party) button. In standard IMTS use the button on the handset is non-functional. MTS was push to talk although full duplex. IMTS left the carrier on continuously unless the "P" button was depressed. Most Bell System owned phones did not have the P button, while most independent telco phones did.
See here a brilliant description from Mr. Geoff Fors:
Amazing carphone control head! MTS/IMTS phones are pretty rare today...
I transferred a nice factory photo from Geoff's site maybe it not make him angry :D
No, it's just the corporate sign (Motorola) on the plate.
My dad has one of these and he wanted to know what they are worth?
My name is terry. I live in the CA area. I am just about to open a western electric (ma bell and Motorola museum) I would love to display the MJ Motorola control head to show the youth of today what took place in the past. I'm not sure what the cost would be today without the equipment package to along with it. Please let me know if you would be interested in donating the unit for prosperity or a amount you might be interested in selling it for.
It's great that you want to open a museum for these beautiful and old devices.
I have long searched for, until I found this old Motorola IMTS phone.
Currently I would not sell any equipment from my collection and please this for your understanding.
Should I want to sell it some time, I will inform you.
Thank you for getting back to me. I appreciate you keeping me in mind. If you should come across something you don't need or have seconds please let me know.
bstru3 wrote:My dad has one of these and he wanted to know what they are worth?
These were wonderful item. I had a working unit for over seven years. When analog was phased out by the government it went to the way side. Not sure on the price anymore. I am about to open a Motorola/Western Electric Museum in CA. I would love to have this on display. Please let me know.
I now have a 2nd device and could give one of the devices. I paid with shipping about $ 300.00 for it and would sell it for it again. Are you interested?
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