
   HERE'S SOME INFO ON THE MAXTRAC/RADIUS LINE OF MOBILES, MOST OF THIS
   STUFF WAS DONE ON VHF MODELS BUT SHOULD BE APPLICABLE TO MOST MODELS.
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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.
   
   How to increase the number of channels in your radio! This will only
   work if you have an 8, 16, or 32 channel radio to start with.
   
   Do you need a pinout for the accessory connector , or the mic
   connector , or how about the programming cable .
   
   Do you want to program frequencies outside of the normal bandsplit?
   For a Maxtrac look at MAXTRAC: , for a Radius look at RADIUS:.
   
   MAXTRAC: Well you will either need to do some HEX editing of your
   saved file or get a copy of the LAB RSS. If you are going to use the
   HEX editing method, see the steps below (at this time this is for VHF
   only):
   
     * make yourself a backup copy of your saved file before you start!
       (just incase....)
     * load the saved file into your RSS and enter a simple frequency (ie
       146.0000 and 174.0000) into the tx and rx fields of the channel
       you want to change
     * save the file and exit RSS
     * load the file into the HEX editor
     * look around the 20Fh offset byte from the beginning of the file,
       you should see an FF 2F preceeded by a bunch of 00 00 00 00...
     * the 4 bytes following the FF 2F are the rx and tx frequencies for
       channel 1 in hex (first 2 are rx followed by 2 for tx)
     * if you programmed 146.000 for rx and 174.000 for tx in the channel
       you want to change, you should see the string 07 D0 1B D0 at the
       location of your channel
     * use the formula: y = 2000 - ((146000 - x)/5) where x is your
       desired frequency in khz and y is your desired result in decimal
     * convert y to hex and voila you have the hex value you want to
       enter into the tx or rx field for the channel you want to change
       (ie. 146.000 MHz works out to 07 D0 and 174.000 MHz works out to
       1B D0)
     * save the file and exit the hex editoy
     * load the file into RSS and go look to make sure the frequencies
       came out okay
     * don't edit the frequencies in RSS otherwise you will lose them and
       have to reload the file into RSS
       
   RADIUS: Life is a lot easier for Radius owners. All you have to do is
   load your file into RSS, go the channel you want to program, when you
   are in the field you want to change, use the shift key and the numbers
   across the top of the keyboard to enter the frequency. Fill the entire
   field and make sure you release the shift key when you enter the
   decimal point. ie. 139.5500 would be !#(.%%)) Its as simple as that.
   
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