Motorola Sm120 Service Manual
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VHF & UHF, 16 Channels Radio hardware features:. Channel Selector Buttons Operator friendly controls and features include:. Rotary On/OFF and Volume Control. Large Textured PTT on Palm Microphone. Rugged, Die-Cast Chassis.
Programmable Option Button Motorola SM120 At the touch of a button, Motorola radios provide the individual and team communication essential to keeping your business productive and successful. Since each radio in the Radius series has been carefully created based on direct customer input, you can select a customized solution that matches your unique professional needs.
The SM120 is an ideal radio for those users requiring multi-channel capability at a modest price point. This rugged mobile has an easy migration path through our RadiusPort program to accommodate your business as you continue to grow.
Motorola SM120 Features Multi-Function This 16 channel mobile allows the user to keep in touch with many groups as needed. Its scanning capabilities will keep the user informed of activities on each channel as they happen. The option button can be programmed for local/ distance, repeater/talkaround and monitoring features.
Large LCD Display This display will indicate which channel the user is on, as well as show indicators for functions the radios is currently executing (ie.scan). Add-On Signalling Capability (RadiusPort) T his feature allows the user to add new capabilities to already existing radios. A Quik Call II OE paging, module that alerts a user to incoming voice selective call messages or a SmarTrunk II. Module for adding trunking operation are currently available for this radio.
Motorola Sm120 Service Manual
Motorola SM120 Models VHF. M33DGC20C1-A SM120 VHF (136-156MHz) 16 Channels 10-25 Watt Mobile Radio UHF.
M44DGC20C4-A SM120 UHF (470-490MHz) 20/25kHz 16 Channel 40 Watt Mobile Radio. M44DGC00C4-A SM120 UHF (470-490MHz) 12.5kHz 16 Channel 40 Watt Mobile Radio All Models Include: Compact and convenient, easy to operate Compact Microphone Power Cable RadiusPort Technology Programmable Option Button Operators Manual 1-Year Warranty Motorola SM120 Applications The SM120 mobile can be used for a variety of applications. Here are a few examples of some key industries: Campus Communication Manufacturing and Processing Facilities Taxi & Limousine Towing Services Utilities Motorola SM120 Accessories Only Motorola Original Products are performance-matched to guarantee the same high standards of quality that you enjoy with your Motorola two-way radio. When you see the Motorola Original logo, you know the products are built and tested to meet the highest standards – yours and Motorola’s.
Motorola Original products turn your communication system into a personal communication solution for your firms everyday needs.
SM50/SM120/SportBase SM50/SM120/SportBase General Information Motorola makes a 25W GMRS radio called the SportBase which would appear to be an SM50. We have been told that it should be able to be programmed if you use version R04.00.00 or newer RSS. Program these radios with. Take a look at the 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. Out of band programming In the SM50.MDF file make a Checksum-16 of the whole file (the F12 option in ), in our case we ended up with 0xAC94 (RSS V 02.00), write this down, you might need it later. Look starting at about offset 0x482, you should see something like: The highlighted area contains all the possible bandsplits that this particular RSS will recognize. A single bandsplit entry looks like: The bytes to take note of are: 01 00 = Bandsplit identifier ( Note: the bandsplit identifier is at the end of the frequency list) 50 05 = 1360 in decimal, ie 136.0000 MHz 18 06 = 1560 in decimal, ie 156.0000 MHz Note there are 3 occurances of the strings 50 05 and 18 06, the first set is the limits displayed in the Radio Wide menu (F4-F2). The second set are the TX limits for the radio. The third set are the RX limits for the radio (note that if the TX and RX limits are not set the same the RX limits are screwed up).
To figure out what hex to enter for your bandsplits you can either use the Base Convertor (in ), or use a calculator with a HEX - DECIMAL conversion function. If you are using a calculator enter your limit (ie 1620 for 162.000 MHz) and convert it to hex, you should get 0x0654. When you enter the data into the.mdf file you have to reverse the bits such that you would actually enter 0x5406 in the field you are changing. If you are using, launch the Base Converter utility and select 'Intel Byte Order'.
Then, enter your desired frequency and write down the hex result. You can then directly enter the hex result (0x5406) into the bandsplit field. In this example we are changing the upper bandsplit of a 136-156MHz radio to 136-162MHz. Save the new file (you might want to make a backup copy of the original if you haven't already. Some of the RSS packages (we don't have codeplugs for everything, so we can't check them all) check the checksum of the.mdf file when you try and load a codeplug and return an error if the checksum of the.mdf file doesn't match the one stored in the program. Try running the RSS with the new.mdf file, if you don't get an error when you run the RSS and load a codeplug then you don't have to worry about the next step. Correcting the.mdf File Checksum If you get a corrupt.mdf file error then you will have to go back and correct the checksum in your edited.mdf file.
Load the file back in your hex editor and make a Checksum-16 of the file. If you compare the new checksum with the original one You will find they are probably different. The only way we have to correct the checksum of the file at this time is to keep editing bits and making Checksum-16 calculations until the edited file's checksum and the original match. You can either edit the Copyright statement or some of the model descriptions in the file. Just take one or a few of these insignificant bytes (some experimentation may be required depending on by how much the cheksum is out) and add or subtract a few bits of the numbers make a Checksum-16 of the file.
You should notice the checksum has changed by the number of bits you added or subtracted. Keep going until the checksum's match. Once the checksum's of the files match you should be able to run the RSS, load the codeplug, and enter the frequencies within your new bandsplits with ease. Adding extra channels to your SM120 by editing the.MDF file (maybe) We have not tested this and have no idea whether it will work or not, it is just a theory, someone us if you try it and it works! It is our theory that the 10 channel radios probably have the same firmware as the 16 channel radios and are just programmed different.
If you want to attempt and convert your 10 channel radio to 16 channels, follow these steps. Open the SM50.MDF file in your Hex editor and make a Checksum-16 of the entire file (the F12 option in ), in our case we ended up with 0xAC94 (RSS V 02.00), write this down, you might need it later. Search for your model number in the file. Once you find your model entry you should see something like this: If you look at this model entry, the third byte after the model number (offset 0x613) is a 0x0A. This is the hex representation for the number of channels in the radio, in this case 10 ch.
Change this to 0x10, to give you 16 channels. Also note the 0x01 at offset 0x611, this is the bandsplit identifier for this radio and corresponds to the table entry at the top of the.mdf file. Some of the RSS packages (We don't have codeplugs for everything, so we can't check them all) check the checksum of the.mdf file when you try and load a codeplug and return an error if the checksum of the.mdf file doesn't match the one stored in the program.
If you don't get an error when you run the RSS with the new.mdf and try and load a codeplug then you don't have to worry about the next step. Correcting the.mdf File Checksum If you get a corrupt.mdf file error then you will have to go back and correct the checksum in your edited.mdf file. Load the file back in your hex editor and make a Checksum-16 of the file. If you compare the new checksum with the original one You will find they are probably different.
The only way we have to correct the checksum of the file at this time is to keep editing bits and making Checksum-16 calculations until the edited file's checksum and the original match. You can either edit the Copyright statement or some of the model descriptions in the file.
Just take one or a few of these insignificant bytes (some experimentation may be required depending on by how much the cheksum is out) and add or subtract a few bits of the numbers make a Checksum-16 of the file. You should notice the checksum has changed by the number of bits you added or subtracted. Keep going until the checksum's match. Once the checksum's of the files match you should be able to run the RSS, load the codeplug, and add and program the extra channels. One thing you have to be careful of is that the RSS will let you put as many channels into it that you want, what the radio will accept is another thing. It appears that once you exceed the maximum number of channels for a radio and try to program them in, the firmware will 'wrap' the extra data around to the beginning and start programming from channel 01.
You will be able to tell if you have exceeded the maximum number of channels by trying to program in one channel at a time until it 'wraps', ie. If the maximum number of channels your radio will take is 16 and you try to program 17 channels into it, once programming has finished you will find your radio will only show 1 channel. Another thing that might happen is that if you exceed the number of channels programmed into the radio, the display will show funny things as you scroll through the channels, it depends on the firmware in the radio.
Adding extra channels to your SM50 Well, we ordered the service manual (part number 6880903Z45) to see how hard it would be to convert the SM50 into a SM120 in order to add more channels. After some research, it looks like it might be possible by changing the control head. However, the price of the SM120 control head is worth almost as much as the whole radio.
So, for now, this project is on hold.