XTR Mobile Information
pic coming soon
If you have a model 70-1336x or 70-1526x , it is an XTR 8 Channel. click here for specific information about this model.
Parts Interchangabilty
ST1 and ST2 control heads cannot be used on XTR radios. ST1 control cables are the same as XTR and flat ribbon or round cables work with both radios. The standard Midland mic is the same for all 3 models of radio, but the connector for some XTR's and ST2 is a 6 pin instead of 4. XTR radios can be upgraded from 22 channels to 99 channels by adding a memory module. These are NLA from Midland but do appear on Ebay from time to time. They plug in near the microprocessor.
Power and control cables may be purchased from Bridgeman Communications and they have wiring diagrams available.
These radios will go out of band with editing of the software and/or the radio code plug. The VCO may require tweaking to lock within the new frequency range. There are several DOS versions of software and also a Windows version available.
XTR Band Ranges
| Lowband VHF | Midband VHF | Hiband VHF | UHF |
| A = 30-36 mhz | ? | A = 136-150 mhz | A = 402-420 mhz |
| B = 36-42 mhz | ? | B = 150-174 mhz | B = 450-470 mhz |
| C = 42-50 mhz | |||
The 70-0351C model can be put on 6 meters with some retuning of the front end and modification of the low pass filter on the antenna output. The shield cover over the front end coils must be removed. More to come soon on this modification.
Repairing Display Problems on XTR Mobiles - The display driver chip is no longer available. If you have a problem with your front mount radio, the control and display panel from a trunk mount head can be used to replace the the one in the front mount. You must remove the electrolytic 25 volt 470 uf axial lead C307 capacitor from the control panel from the front mount radio and install it on the control panel of the trunk mount head otherwise you will have no speaker audio when you reassemble the radio. The trunk mount radio control head does not have this capacitor installed
XTR Error Codes
| Code |
Error |
Note |
| E1 | MPU ROM/RAM error | |
| E2 | No model/no channel data programmed | |
| E3 | Synthesizer (VCO) out of lock | Common when programming out of band frequencies |
| E4 | Checksum error of channel data | |
| E5 | courtesy of: http://www.greenecountycommunications.com | courtesy of: http://www.greenecountycommunications.com |
| E6 | ||
| E7 | Backup power down | A common error on power up when power has been disconnected |
| E8 | Programmer I/F error | 23 or more freqs in a 22 ch radio can generate this error |
| E9 | Clone I/F error |
Programming XTR Mobile Radios
Programming hardware for an XTR is a Midland 70-1080, 70-1308 programmer, or GCC's clone of the 70-1308 called the XTR1. You can order it here. The 70-1308 or XTR1 plugs into your computer's serial port.
XTR software comes in both MS DOS and Windows versions. The Windows version works with Win95, Win98, 2000 Professional, and XP. Frequency programming is straightforward.
| Syntech I | Syntech II |
| XTR | XTR 8 Channel |
| Bantam | Titan |
| Identifying Your Radio | Programming Cable FAQ |