Micor

01/02/07

"W4XE Repeater Tech page ©"

Conversion of Motorola UHF Micor Mobile to a repeater

There are a multitude of ways to convert this radio into a repeater. Over the years I've converted the UHF mobile into a repeater in various way. Below are some of the techniques I've used.

The UHF radio only uses one Receive Crystal for a repeater. The Exciter uses an injection oscillator off of the receiver. So only one crystal needs to be ordered for the radio to be a repeater. Zero the receive crystal on the receiver frequency and then adjust the offset oscillator to zero the transmitter.

Here are some pictorial files on conversion points for the micor:

Click on the thumbnails for the full size photo.

Modification of the exciter. Injecting PL encode tone into the exciter and bypassing the existing Moto PL deck (PTT). Optional bypassing of microphone preamp stage.
Modification of the receiver. Disabling AFC control.
Modification of the audio/squelch board. Enabling the receiver for full-duplex operation. Addition of capacitors for RF noise immunity.
Modification of the system board. Restoring power and ground from Missing control head cable signals.
Access Points for an external Repeater Controller
Adding a ComSpec TS32 for CTCSS/PL encoder/decoder
Adding a COS/PL Buffer board
Using the control head connector for a repeater controller
J901 Control head connector Pinout

Anyone working with a Motorola needs to check out the batlabs site: http://www.batlabs.com/

There are no warranties implied or expressed in these conversions. These are guidelines that I have used, but it is up to the person modifying the radio to guarantee no harm will come to the radio.

W4XE 2005

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This site was last updated 01/02/07