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Telephone to Radio Adapter - Phone Line Extender

Phone Line Extender | Phone to Radio Adapter: TRA

To Order Call:
1-800-MIDIANS (643-4267) or 520-884-7981


Midian's TRA provides telephone voltages and ring voltages to simulate a telephone line. The TRA uses VOX operation for asserting the PTT of simplex two-way radios or remote controllers. Other features include connect/disconnect ANI's, channel scanning, and multiple decode numbers for individual or group call. Duplex operation is possible when using a duplex mobile radio.


  • 10 number memory dial
  • Busy channel lockout
  • Connect & disconnect ANI's
  • Extends your telephone line to remote locations using 2 duplex radios
  • Makes rural telephone applications simple & inexpensive
  • Programmable time-out timer
  • Simplex or duplex operation
  • VOX operation
  • Works with most DTMF interconnects
  • 3 year warranty


The TRA can be used as a phone line extender for areas without phone line access. It can also be used with a KSU phone system to control a base station or a tone/DC remote or to provide in-plant paging of two-tone, five-tone, or DTMF.


Midian's TRA is easily interfaced to many full-duplex or simplex mobile radios and KSU phone systems. The TRA works with most DTMF interconnects including Midian's DTI and STI series interconnects.

Case Studies

TRA Case Study

Product Manuals

TRA Product Manual