MAXTRAC | RADIUS

MAXTRAC/RADIUS

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In typical Motorola fashion, the Maxtrac and Radius line of mobiles are really the same radio! The only real difference is the actual firmware of the radio. All of the info provided here should work with varying degrees of success depending on the features of the original radio. The Service Manual is crammed full of stuff and would be well worth ordering if you plan to do any experimenting with the radio. The part number of the Service Manual is 6880102W84 for the Maxtrac and it contains info on all models of the radio (Low, VHF, UHF, and 800 MHz).
Do you need a pinout for the 16 pin accessory connector, the 5 pin accessory connector, or the mic connector, or how about the programming cable?
If you want to inject audio into your Maxtrac/Radius while tuning it up with the RSS, you will want to have a look at this schematic.
For a easy overview of all the programmable pin configurations on the accessory connector, check out this Excel Spreadsheet or this image.
If you want an easy way to connect to the Accessory Connector on these radios, you can order the HLN9242A or HLN9457A Accessory Connector kits. These include an accessory connector housing, some pins, and some wires with pins already attached. One thing to note, the HLN9242A kit also includes a pin extractor for removing previously installed pins.
If you would rather build your own accessory cables, the parts are available from DigiKey. You will want the following:

• Connector, with locking tab 16 pin, 104422-1-ND (AMP 104422-1)
• Contact, A3007-ND(AMP 1-87309-3)
• Housing, 5 pin, 455-1186-ND (AMP VHR-5N)
• Connector terminal crimp, 455-1319-1-ND (AMP SVH-41T-P1.1)

The first two parts are for a 16 pin accessory connector. The second two are for a 5 pin accessory connector.
Do you want to program frequencies outside of the normal bandsplit? For a Maxtrac look at Maxtrac, for a Radius look at Radius.
Having RSS errors? Look at the Radius Series RSS Error Codes
Some people's voices just suck when broadcast over a Maxtrac/Radius due to the the cutoff frequencies used in the TX Audio stage. Here ismodification to make the audio more pleasing to the ear.
If you have a TDN8310A DTMF microphone from a Maxtrac and are looking for a schematic for it... look no further. The proper source for the schematic is in the 6880309C84 manual. However, this microphone is almost identicle to the VLN1017A DTMF microphone for the MCX1000. You can look at the Tone/Logic Board and the Microphone/Beeper Board schematics. Note that the part designations in these schematics are slightly different for the TDN8310A, but it is better than nothing. This board layout will make locating the proper jumpers a bit easier.
If you get the above mentioned 6880309C84 manual, you will find that it covers the following microphones:

• TDN8305A/B
• TDN8306A/B
• TDN8307A/BSP
• TDN8309A/B
• TDN8310A/B

Another microphone manual that may be of interest is the 6881085E15. It covers the Auto-Dial Touch Code Encoder Palm Microphones with Backlit Keypad. These are microphones:

• TMN6169A - DTMF Maxtrac Conventional
• TMN6170A - DTMF Maxtrac Trunked
• TMN6171A - DTMF MaraTrac A2, A3
• TMN6172A - DTMF MaraTrac A7
• TMN6173A - DTMF Spectra Conventional
• TMN6174A - DTMF Spectra Trunked
• TMN6175A - DTMF Mostar Conventional
• TMN6176A - DTMF Mostar Trunked

One interesting feature of these microphones is they have an option jumper that allows the +12 volts of a Systems 9000 microphone connector to power the keypad backlight (you also need a Systems 9000 microphone cord with all 6 wires). These microphones have 9 auto-dial memories and one last number dialed memory (the manual has the programming info).
If you want to build a nice little programmer for the Maxtrac/Radius radios, one that does not require a RIB, check out this link. Just connect the BUS+ and GND wires from the circuit to the appropriate pins on the microphone connector as shown in the programming cable schematic. If you check the RIB page you will find some additional circuits you can try.