Microphone Requirements

a) Delta and Rangr Conversions

    To convert one of the Delta or Rangr radios, you really need the transistorized dynamic microphone used with the radio in commercial service.  They can often be found on eBay auctions, or perhaps even from a friendly dealer.  They are designed to be 'line powered' by the radio (+ 9 VDC on the Mike High lead) and provide enough audio to traverse the long cable nornally associated with trunk installations.

    As you are probably going to build your own 'custom' control head, there's no way that the factory plug on the end of the mike cable can be used with your new head.  So, just cut it off as close to the plug as you can.

    Then, use a razor blade to skin back about 2 inches from the coard and remove the rigid rubber cable that keeps the cable in shape.  In so doing, you'll discover 5 color-coded leads, red, white, green, black and blue.

    Connect the white lead to the mike PTT and the black and green leads to ground.  Connect the red lead to the 'mike hot' portion of the 3 conductor plug.  That's all there is to it.  The blue lead does nothing (that I could find).

    When the wiring is finished, make an ohm meter check.  When the PTT switch is depressed, the resistance between the mike hot lead and ground should be about 4.25 K ohms.  Of course, the resistance between the PTT switch and ground should be near zero.

    Crimp the end of the plug so that the cable will not pull out.  If needed, apply hot glue to permamently fix the connections.

b) Phoenix Conversions

    The GE Phoenix radios use an electret mike, again powered by the radio.  If you are going to retain the existing connection method in the rear of the radio, then there's no need to make any wiring changes.

    If, however, you wish to mount the microphone connector on your control head (along with the Phoenix volume control), then the black and shield lines from the mike are connected to the ground connection on the plug, the white lead is the PTT and the yellow lead is the Mike High.  Of course, you first have to cut off the connector.


G.E.and the product names Phoenix, Delta, Rangr are trademarks of Ericsson General Electric Mobile Communications

DISCLAIMER - - If you follow the steps outlined herein, you do so at your own risk. I cannot, nor will not, be responsible for any possible damage to radio equipment, personal property, to yourself or to others caused by modifications that you may make to the radio as a result of your reading this.

The M/P controls TRANSMITTING and receiving on a wide range of frequencies. In the USA, TRANSMIT operation requires a license issued by the FCC  for the class of operation intended.  Amateur radio licensees must maintain strict control over their equipment, preventing unlicensed operation within the amateur bands, or outside of them.

The information on this website, the schematic drawings and the secure code contained within the microprocessor are all copyrighted.