Service Manuals
Here are a listing of the Service Manual part numbers for this series of radios:
GTX Portable
The programming cable for the GTX is the same as the GP300.
GTX Mobile/LCS2000
The programming cable for the GTX is the same as the Maxtrac/Radius series.
The mic connector pinout is the same as the pinout of the Maxtrac/Radius series.
If you make a mic plug with a jumper from pin2 to pin5 (see the schematic above for numbering convention), you will make a "Test Plug" to put the GTX into test mode. Turn the radio on and in 3 seconds the radio's receiver will open up and your in the test mode.
The pinout of the accessory connector for the GTX is below:
| Pin Number | Description |
| 1 | External Speaker- |
| 2 | External Mic Audio |
| 3 | External PTT |
| 4 | External Alarm |
| 5 | Flat TX Audio |
| 6 | SCI Data In |
| 7 | Ground |
| 8 | SCI Data Out |
| 9 | Emergency Switch |
| 10 | Ignition (+12V to turn on radio) |
| 11 | Flat RX Audio |
| 12 | General Purpose I/O |
| 13 | Internal Speaker or Ground or Sw +12V (see below) |
Pin 13 Configuration:
Note: Do not install R0425 if R0426 is installed, this will severely damage the radio!
Looks like the logic board in the GTX is similar to that of the Maxtrac, it may be possible to hack a couple more channels into conventional mode.
General Information
Below is a model list for the GTX radios:
| Model Number (H=Handheld, M=Mobile) | Radio Model | Conventional Channels | Trunking Systems | Trunking Talkgroups | Band |
| M11UGD6CB1AN | GTX | 10 | 10 | 8 | 800 MHz |
| H11UCD6CB1AN | GTX | 10 | 10 | 8 | 800 MHz |
| M11UGD6CU1AN | GTX | 10 | 10 | 8 | 800 MHz/LTR |
| H11UCD6CU1AN | GTX | 10 | 10 | 8 | 800 MHz/LTR |
| M11WGD4CU1AN | GTX | 10 | 10 | 8 | 900 MHz/LTR |
| H11WCD4CU1AN | GTX | 10 | 10 | 8 | 900 MHz/LTR |
| M11WGD4CB1AN | GTX | 10 | 10 | 8 | 900 MHz |
| H11WCD4CB1AN | GTX | 10 | 10 | 8 | 900 MHz |
| H11UCC6DB1_N* | GTX | 4 | 4 | 3 | 800 MHz/P-PLUS |
| H11WCC4DB1_N* | GTX | 4 | 4 | 3 | 900 MHz/P-PLUS |
| H11UCC6DU1_N* | GTX | 4 | 4 | 3 | 800 MHz/LTR |
| H11WCC4DU1_N* | GTX | 4 | 4 | 3 | 900 MHz/LTR |
*Motorola apparently came out with a new series of GTX portables for 800/900 use. This new GTX portable contains no display nor keypad. Channel selector on top is a 16 position channel selector but will (according to our documentation) only support 12 trunked channels and 4 conventional channels.
If you want to clone these radios, just use the clone feature in the RSS, that's what its for.
If you want to change the band limits for your radio, you need to refer to the Maxtrac page. You will use the same procedure to modify the gtx.mdf file for extended band limits.
