General Information
The GR400 and GR500 X-Pand Repeater Stations provide low cost communications solutions. In both X-Pand repeaters, all of the necessary components are built into one cabinet. The repeater housing allows space for the R1225 transceiver module and the retrofit control panel, two optional repeater controllers, the power supply, a duplexer, and a preselector.
The part number for the service manual for the GR400/GR500 X-Pand Repeaters is 6880905Z54.
The GR400 is rack or cabinet mounter, the GR500 is wall mounted. Both have space for two repeater interface options or the optional SmartTrunk II controller.
When you are programming the R1225 and in the mode screen of the RSS, highlight RX frequency field then hit shift-F3 to change bandpass filters for receive. Same applies to TX. Highlight TX frequency and hit shift-F2. This will allow you to select offset frequency.
To see which pin functions the accessory connector of the R1225 should be programmed for, for all the available controllers, click here.
Repeater Controllers
Basic repeater interfacing circuitry and control are features of the R1225 transceiver. For advanced features, external controllers may be added inside the repeater housing.
The optional repeater controllers available are as follows:
The repeater functions for the respective controllers are as follows:
| Component | Repeater Function |
| ZR310 | Community Repeater (for up to 70 groups) |
| ZR320 | Full-Featured Telephone Interconnect |
| ZR340 | Advanced Interconnect |
| i750R | Full-Featured Telephone Interconnect |
| i20R | Multiple-Tone Panel (up to 10 groups) |
| TRA100R | Tone Remote Adapter |
| ST-835M | Digital Trunking with Interconnect (SmartTrunk II) |
Each repeater interface component has its own associated manuals, they are:
| Component | Service Manual | Software Manual |
| ZR310 | 6880904Z64 | |
| i750R | 6880904Z39 | 6880904Z45 |
| i20R | 6880904Z40 | 6880904Z55 |
| ZR340 | 6880905Z02 | |
| ZR320 | 6880903Z42 | 6880903Z43 |
| TRA100R | 6880903Z42 | 6880903Z43 |
| ST-835M | 6880905Z59 |
ZR320 Notes
As originally designed, the ZR320 will produce 50% transmitter peak system deviation for a receiver input signal with 60% peak system deviation. A normal repeater audio, 60% out for 60% in, can be obtained by bridging a 10kohm 5%-1W resistor across R9 (2.2kohm) on the ZR320 Controller Board. This can be important in systems using the X-Pand feature.
ZR340 Notes
Jumper configuration:
| Jumper | Setting |
| JP7 | B (16) |
| JP8 | B (16) |
| JP9 | A or B |
i20R Notes
Jumper configuration:
| Jumper | Setting |
| JU20 | Out |
TRA100R Notes
If channel steering is required, program pins 6, 9, and 12 as shown in the following table. NOTE: "Debounce" must be selected as "ON&wuot; for the channel steering pins. An extra wire must be added to the cable to connect pin 9 of the R1225 connector to pin 9 of the "TX" connector for the TRA100R.
| Pin # | Function | Debounce | Active Level |
| 6 | Channel Steering 0 | On | Low |
| 9 | Channel Steering 1 | On | Low |
| 12 | Channel Steering 2 | On | Low |
i750R Notes
To put the unit into Test/Diagnostic mode, simultaneously press the UP and DOWN buttons. The i750R will be in Test #1.
P>The programming cable is the same as the Maxtrac/Radius.It is a single tone, telephone interconnect repeater controller. It has its own RSS software, RVN4140A, and can also be connected to a 1225 repeater or a GR300.
It was manufactured for Motorola by Control Signal/Gaitronics (Now owned by Hubbell).
