Write it down if you have to. OLD before you HexEdit it. After overwriting editing the 5 th byte for the new channel count, we will do another generate checksum and see how much re-editing we have to do to get our original value of 5D53h back. We will do this at the bottom of the document so as to avoidthe model definition file content area. In the right pane highlight the first 10 characters of the base model number. Only highlight the first 10 characters so the mode location where to look stays fixed for this procedure.
Here is what we have after finding and highlighting our model number. Notice the 5th byte: it is 10h, or 16 modes. At this point we are interested in the 5 th byte after the highlighted model number code. The numbers to shoot for are up to you, but I try 40 first. This is encountered in the RSS once you have the edited.
Overwrite the 10h on the 5 th byte to 28h, changing the mode count for that model number from 16 to 40 modes. Now, the value of 10 is now At this point we could edit any of the other model numbers in the RSS using the same method.
Once all the edits are done we need to save the modified file while preserving the original. Until you verify the channel count change in an actual radio, it is wise to save the edited file somewhere else OR make an experimental GM file altogether and keep the original separate.
Our edit is in red until we save the file. Scroll to the end of the file in HexEdit. Here will be the copyright info area. That may be due to the masked vs. Fortunately, you can use an accessory plug wired for a MaxTrac , in a GM Click on the image to enlarge it. The accessory connector and pins are also well documented in the MaxTrac section.
Note that many accessory pins on the expanded four-layer logic board are programmable, whereas you're stuck with the pin assignments on the masked two-layer logic board. The channel expanded logic board radios support "channel steering" through the accessory connector.
They turn into a binary coded input that allows you to select any of the possible 16 channels by grounding the appropriate input lines assuming you've programmed the radio for active-low inputs.
To select channel 1, ground the "Channel Select 1" line. Channels 1, 2, 4, 8, or 16 may be selected by grounding select line 1, 2, 3, 4, or 5 respectively.
All other channels are selected by grounding multiple select lines. If you release all of these lines, the radio reverts to the channel selected by the front panel. If you select a channel that does not exist i. Channel steering DOES work as expected on radios with more than 16 channels, i. Pins 4,8,12,14 can be configured for COR. Pins 6,8,9,12,14 can be configured for Channel Select. Unfortunately, the MaxTrac software does NOT offer this feature, so if you have a MaxTrac and you want channel steering, you have to install the Version Also, the Radius software only provides for three Channel Select input lines, not five like the GM This means you can only select channels 1 through 7 plus whatever the front panel has selected, regardless of how many channels the radio might be programmed with.
This reduces the gain of the receiver and improves intermod rejection by 10dB. The circuit can be activated by soldering a small jumper on the RF board. The GM control head is quite similar to the MaxTrac. There is an additional circuit board, soldered to the logic board pins, that the control head connectors plug into, that provides some RF filtering and Zener diodes to protect from excessive voltage. Also, the internal speaker now connects through the control head cables, rather than on its own 2-wire cable.
This makes it easier to remote-mount a GM There are kits available for this purpose. For comparison, here's the inside view of a MaxTrac. Notice the lack of shielding and no filter board between the logic board and control head. The GM logic board is significantly different from the MaxTrac logic board. The audio power amplifier is one single IC rather than discrete transistors. The heat-sink is considerably different and mounts only to the bottom of the chassis - no more T8 flat-head screws through the side of the chassis.
Captain Kilowatt Professional Amateur. Joined: Apr 6, Messages: 16, Likes Received: 10, Joined: Aug 18, Messages: 9 Likes Received: 0. Joined: Apr 18, Messages: 5, Likes Received: RonF New Member. Joined: Aug 14, Messages: 2 Likes Received: 0.
Barry Cubio Member. Radiotronics sells everything you may want to do so. Combine, sign, windows 95, windows 7. Do you will be programmed using cps r This video shows me programming the motorola gp series radio from. Doesn't usually run under a quick, and pmr. Motorola cps r Programming the motorola gp or gp professional series radios is relatively straighforward.
If you have a tech bench, the alignment procedure is also included in the software. Samsung Scxf. Attached is current as they were in windows. You can also use microsoft virtual pc to do this. Attached is confusing, whilst they were in the software itself.
Radiotronics sells everything you may want to do just the gp The software is legit motorola cps designed for gp, not a dodgy knock off or anything. Also see our motorola gp front cover kits. Customer programming software r Another way is to use dosbox to emulate a computer running dos, it is also possible to emmulate a slow computer. Service manual is avaialble for download from the zetron page at. The motorola radius gp radius gp professional portable radios? I was not familiar with the xp software and thought the writing blank.
It remains as the classic motorola two-way mobile radio, even if it has a great successor in the gp Radio programming applications and documentation of interest to radio amateurs. Likes received, the manual online.
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