The first Motorola AM mobile transmitter was the T-69-20A.  If there was a non-"A" model, it must have been a prototype.  This appears to have been Motorola's only AM mobile transmitter, and is a two piece set in which the power supply and modulator are in one case and the RF section in a second. As originally configured, the power supply was usually installed on the firewall of the automobile, next to the receiver and under the glove box, while the RF section was located in the trunk and attached to its antenna via a short braided copper rope. A rather thick cable delivered the high voltage and other lines back to the trunk, under the floor mat. However, placing both sections in the vehicle trunk was a popular option.

This transmitter operates in the 30-40 Megacycle range, using an 807 power amplifier tube modulated by a 6N7. It is crystal controlled on a single frequency and outputs approximately 10 Watts. The power supply is a 6 volt type.