Motorola GP 88 (GP88 GP-88) transceiver: Wide Band frequency modification

   
 
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26 June 2017, 4:42 UTC 


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Motorola

Motorola GP 88 (GP88 GP-88)
Programming interfaces schematics for Motorola: Motorola MAX232 programming interface, Motorola transitor programming interface
Programming software for Motorola GP 88 (GP88 GP-88) : Motorola GP 88 RSS Dos programming software (R01.00.00)

Mods for Motorola GP 88 (GP88 GP-88) :
    Motorola GP 88 (GP88 GP-88) Modification GP88 to GP300
    Motorola GP 88 (GP88 GP-88) Wide Band frequency modification

Motorola GP 88 (GP88 GP-88) Wide Band frequency modification

The basic process is just open lowest and highest limit of frequency.
offset 20351	94 change to 00
offset 20352	11 change to 00
offset 20358	5c change to 06
offset 20359	12 change to 27

offset 20365	94 change to 00
offset 20366	11 change to 00
offset 20372	5c change to 06
offset 20373	12 change to 27

offset 20379	94 change to 00
offset 20380	11 change to 00
offset 20386	5c change to 06
offset 20387	12 change to 27

offset 199688	5c change to 06
offset 199689	12 change to 27

Now, how is it works ? can you see 94 paired with 11 --> 1194, 5c paired with 12 -->1254 and so on ?.
If you put the numbers with these series 1194, 125c, 0000, 2706
1194 hex is 4500 in decimal
125c hex is 4700 in decimal
0000 hex is of course 0 in decimal
2706 in hex is 9990 in decimal

Now you can see 4500 (450.0 in frequency) is the lowest frequency permitted for Motorola (F3 ?) and 4700 (470.0 in frequency) is the highest frequency permitted for Motorola (F3 ?).
If you change 4500 to 0000 and 4700 with 9990 it means that the limit is extended (erased ?). With this method you can change the limitation of your Motorolla RSS as your wish.


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