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February 13, 1998
 
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Motorola MICOR High Band to 220 MHz Conversion
RECEIVER MODIFICATION

Step 1: Remove Aux. RX board from rear and Aux. control Board and set aside… They will not be reused.


Step 2: Remove Main Rx board and replace the following components with the values shown:
 
C108 - 27pf NPO disk C113 - 2.2pf NPO disk
C109 - 39pf N150 disk C116 - 2.2pf NPO disk
You need to remove the Metal shields from the 4 coils at the rear end of the RX board to access these Caps.

Remove the 2 screws holding item 29, then remove item 29. Unsolder 2 tabs on each of the item 12 shields

And remove.


Step 3: Connect Orange wire from Rx Board TP to location shown in Fig. 2.


Step 4: Modify Helical resonator coils per Figure 3. The resonators are held in with 2 screws each. Remove resonator assembly from main RX board before attempting to modify it.


Step 5: Reinstall Main RX board.


Step 6: Connect Coax that used to go to AUX RX board antenna input to Main antenna input.


Step 7: Set channel jumpers on Control Board per figure 4.


Step 8: Tune per Motorola Manual.

NOTE: A GAASFET Preamp may be needed for optimum sensitivity.


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