
   OUT OF BAND PROGRAMMING AND CHANNEL EXPANSION FOR THE GP300/P110
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   This page contains the information needed to:
   
   #1 Program the GP300/P110/GP350 outside of it regular frequency
   bandsplit
   
   #2 Expand the radio to 16 channels, first method.
   
   #3 Expand the radio to 16 channels, second method.
   
   #1...
   
   To program frequencies outside of the rated bandsplit in the
   GP300/P110/GP350 is very simple, follow the listed steps:
   
     * Hold the shift key down while entering the frequency you want
     * You must release the shift key when you enter the decimal point
     * You must fill the entire field-use zeros(while holding down shift)
     * When you are done hit enter like normal and the frequency you
       entered will appear in regular decimal like any other frequency.
       
   #2...
   
   There are several ways you can add channels to a 2 or 8 channel
   GP300/P110 radio. The easiest is to use a program called TK (Took
   Kit). This programs plugs into the normal cables and RIB and does all
   the work for you. TK won't work with the GP350 so don't try it. The
   hex method may work but has not been tested.
   
   #3...
   
   A much slower but just as effective way of doing it is to HEX edit the
   saved file. The saved file from the GP300/P110 uses some form of
   encryption that changes the look of the file each time it is saved in
   RSS. This can sometimes make the below process long and boring.
   
   First, make a backup of the codeplug file you want to edit (copy it to
   a .bak or something). In the event you loose track of which bit you
   are editing and get a Error 58, its easy to start over again.
   
   Next, load your codeplug file into your hex editor. You want to edit
   the byte right after the end of the serial number. Make a note of it's
   original value and increment it or decrement it by one and save the
   file.
   
   Exit the hex editor and start up the GP300 RSS. Try loading the file
   you just edited, you will either get an Error 21 (Radio not supported)
   or the codeplug will load okay (once in a while you may get an Error
   58, but this isn't very common).
   
   Note the model number that the codeplug has loaded as, and compare it
   to the original model number of the radio. If the nineth character of
   the model number is a "C" (ie. P93YPC20C1__) you have a 16 channel
   codeplug. Also, make sure that the rest of the model number is the
   same, otherwise you may have made a 16 channel codeplug on some other
   band!
   
   If the RSS won't load the codeplug, go back to the hex editor and
   change the bit again, save the file in the hex editor and try loading
   it again. Keep repeating this until a) you get tired and give up, b)
   you are successfull, or c) you edit that byte all 255 times. If you
   have come to point c), edit the byte to something you know that works,
   load it in RSS and re-save it in RSS. This will re-encrypt the file
   and you can continue editing.
   
   Tips:
   
     * run the RSS in one DOS window of Windows 3.1x and the hex editor
       in another to make swapping between the programs less painfull
     * try editing the byte up and down a ways and see how many "good"
       loads you get, you will probably find that the "good" loads will
       be somewhat grouped together
     * if you aren't having much success finding many combinations which
       will load, re-save a good codeplug in RSS to scramble the codeplug
       and keep trying.
       
   Note: Sometime in 1994 Motorola changed the channel knob in the 2
   channel radios such that if you were to hack the radio into an 8
   channel model, you still get 2 channels. To tell if you can convert
   your radio, pop the knob off and turn the selector. If the 2 channels
   programmed in the radio come up in the order 1,2,2,2,2,2... it will
   work. If they come up 1,2,1,2,1,2,1,2... forget it you'd probably have
   to change the channel selector to get it to work.
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   If you have any questions, email me and I'll try to help.
   
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