Motorola Radius GM300 Radio Doctor for Windows 2000/XP & dOS,untuk SETTING radio Radius GM300 (2.1. You do this with the help of a Hex. Hex Workshop This can be found. The file you need to modify is. Jun 08, 2018 Radio Doctor for MOTOROLA RADIUS GM300 versi 1.3. To Hack Shopadmin Asp. Coba lagi download,mungkin servernya lagi down. Table 1 Rated Power and Distance Rated Power of Vehicle-Installed Minimum Distance from Mobile Two-Way Radio Transmitting Antenna 7 to 15 Watts 30.5 cm (1 Foot) 16 to 50 Watts 61 cm (2 Feet) More than 50 Watts. Radio Doctor for MOTOROLA RADIUS GM300 versi 1.3. To Hack Shopadmin Asp. Coba lagi download,mungkin servernya lagi down. Table 1 Rated Power and Distance Rated Power of Vehicle-Installed Minimum Distance from Mobile Two-Way Radio Transmitting Antenna 7 to 15 Watts 30.5 cm (1 Foot) 16 to 50 Watts 61 cm (2 Feet) More than 50 Watts. The GM300 was Motorola's next step in the MaxTrac / Radius mobile product lines. The schematics are remarkably similar. You can even interchange some boards between the GM300 and MaxTrac radios. Like the MaxTrac, the GM300 line has been discontinued by the manufacturer. I came across something in yahoo called Radio Doctor witch is. Motorola GM300 Programming - FJ45.COM FJ45.COM Tip on using the RPC-M300 '3 in 1' programming cable: I was inspired to create this page because I got a programming interface for a GM300 which came with no documentation.

• Motorola Radius Gm300 Radio
• Motorola Radius Gm300 Software
• Radio Doctor For Motorola Radius Gm300 Manual
• Motorola Radius Gm300 Radio Doctor For Windows 2000/xp

The GM300 was Motorola's next step in the MaxTrac / Radius mobile product lines. The schematics are remarkably similar. You can even interchange some boards between the GM300 and MaxTrac radios. Like the MaxTrac, the GM300 line has been discontinued by the manufacturer. Throughout this article, reference to MaxTrac radios implies Radius radios as well.

Naturally, you need different programming software (RSS), but if you've ever programmed a MaxTrac, you'll be right at home with the GM300. The radios operate the same, too. See below for more info on the RSS and programming.

GM300 mobile radios cover the VHF (136-174 MHz in two ranges) and UHF (403-520 MHz in four ranges) bands, with 8 or 16 channels, 12.5 or 20/25/30 kHz channel spacing, and 10, 25, and 35-45 watt power levels. They use the same accessories (loudspeakers, microphones, accessory plugs, power cords, mounting brackets, etc.) as the MaxTracs.

The M120 radio is just about the same as a GM300 but has 'less features' - this would be the 2-channel version, equivalent to a MaxTrac 50. There is also an M10 single-channel radio, and an M130 2-channel radio that is an M120 with the GM300's signaling capabilities.

The 16ch GM300 radio uses the expanded logic board with firmware in an EPROM, that gives you the ability to program several of the accessory jack pins. The 8ch GM300 and the M-series all use the masked logic board that has no programmable pins. The masked logic board also has limited code plug space, hence fewer channels and less capabilities.

Here's a front view photo of a 16-channel MaxTrac, a 16-channel GM300, and a 2-channel MaxTrac:

GM300 Model Numbers:

The first six characters are pretty much standard Motorola convention. The IF frequency is usually 45.1 MHz but if you have multiple radios near each other, this can cause interference, so you can optionally order the radio with an alternate IF frequency.

The XV-series seems to all be 1 channel radios. The XQ-series seems to be all 2 channel radios. The GM-series can be 2, 8, or 16 channel radios. The XV and XQ may be used by the M10, M120, and M130 radios.

The second six characters provide a lot of useful information about the capabilities of the radio and the boards contained within it.

A typical model number would be M44GMC09C3A_. This is a 40 watt, UHF radio, 45.1 MHz IF, narrow spacing (12.5 kHz), 16 channels, expanded logic board, 438-470 MHz band.

It is rare that the model number includes the specific frequency range the radio is capable of handling (10th character). You don't get that lucky with MaxTracs, Spectras, etc. I wish all the model numbering was so useful. It is NOT practical to change the frequency range for which the radio was manufactured. The RF board and PA assembly are frequency-dependent; the logic board and front panel are not. As the model number tells you which range the radio is, if you end up with the wrong one (assuming the radio hasn't been thrown together out of spare parts or had modules swapped) it's your own fault for not doing your homework.

The expanded logic board has its firmware contained in a socketed EPROM, which can be replaced. The masked logic board has its firmware permanently stored in the soldered-in microprocessor IC. People have apparently modified the RSS to get 16 channels from masked logic board radios and 40 channels from expanded logic board radios.

It would appear that GM300s are not capable of any form of trunking operation. However they can do G-Star signaling for use with GE radio systems.

There are other models, such as M10, that are often called GM300. This article is specifically oriented towards the radios with 'GMC' in the model number.

Specifications:

Click on the image to enlarge it.

Note that a revision to the service manual shows two VHF ranges: 136-162 MHz and 146-174 MHz. Also, the power levels are continuously variable throughout the three ranges: 1-10, 10-25, 25-45 watts.

Board Numbers:

This list is sorted alphabetically by Function, then Description.

Logic Board Jumpers:

Click on any image to enlarge it.

The documentation page above lists the jumpers as JUnnn. For some reason these are shown on the board layouts as either Pnnn or JUnnn. They're the same thing. There may or may not be silk-screened legend on the boards; it depends on the revision level.

There are two quite different logic boards used with the GM300. One (the expanded logic board) has a shield over the microprocessor components, its program is stored in a socketed EPROM, and the board has four layers, while the other (the masked logic board) has all the components exposed, its program is stored within the microprocessor, and the board only has two layers. The image below shows the location of the jumpers on the two-layer (masked) board:

The image below shows the location of the jumpers on the four-layer (expanded) board.

These jumpers are quite visible on the photo of the expanded GM300 logic board below. Note that some of them are also present on MaxTracs and have the same functions.

Accessory Connector:

Click on the image to enlarge it.

Note that the 8-channel radio signals are slightly different than the 16-channel radio signals. That may be due to the masked vs. expanded logic board. Fortunately, you can use an accessory plug wired for a MaxTrac (7-9, 15-16) in a GM300.

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 and these can't be modified.

Channel Steering:

The 16-channel expanded logic board radios support 'channel steering' through the accessory connector. You need to program the general-purpose I/O pins (6, 8, 9, 12, and 14) for 'Channel Select'. 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.e. 10 channels programmed and you select channel 16), the radio reverts to the channel selected by the front panel. Channel steering DOES work as expected on radios with more than 16 channels, i.e. you can select anything up to channel 31, as that's all that's possible with five select lines. This article tells you how to use channel steering.

Motorola Radius Gm300 Radio

Pins 4,8,12,14 can be configured for COR. Pins 6,8,9,12,14 can be configured for Channel Select. So you can put COR on pin 4 and CS on the others. The fact that the masked (8-channel) radios and most MaxTrac users selected pin 8 for PL&COR Detect is something that will have to be changed if you want multiple features activated. It's up to the user to choose the desired functionality given the number (six) of programmable I/O lines.

The Motorola Radius programming software also supports Channel Steering if you have Version 21.01 firmware in the radio and a 16-pin logic board. 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 21.01 firmware, then blank and initialize the radio with RADMBL software, turning it into a Radius model, just so you can program the accessory connector to handle channel steering. Also, the Radius software only provides for three Channel Select input lines, not five like the GM300. 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.

Programming:

The HVN8177 programming software (RSS) programs the M10, M120, M130, and GM300 mobiles, as well as the GR300, GR400, and GR500 desktop repeaters. The latest release is HVN8177F version R05.00.00 dated December 1995. The RSS is shipped on 3.5-inch diskettes and is a DOS-only program.

The microphone connector is exactly the same as on a MaxTrac, and it's also well-documented in the MaxTrac section. The programming cable and RIB setup is the same as what you'd use for a MaxTrac or GTX.

You can hex-edit the MDF file in the RSS to allow an 8-channel radio to take 16 channels. Additional information is available at Colin Lowe's web site.

The GM300 with the expanded logic board supports the same common signaling modes as a MaxTrac (PL, DPL, MDC, etc.).

Differences from a MaxTrac:

The GM300 has models that fully cover the 144-148 MHz and 440-450 MHz amateur bands. Some MaxTracs will go that low if you adjust the VCO and hex-edit the RSS.

The GM300 RF boards have a local/distant attenuator in the receiver front end. This reduces the gain of the receiver and improves intermod rejection by 10dB. You can put a GM300 RF board into a MaxTrac, but there will be no control of the local/DX circuit, and the radio will have poor sensitivity. The circuit can be activated by soldering a small jumper on the RF board. The GM300 RSS and logic boards know how to control this circuitry; the MaxTrac RSS and logic boards do not.

The GM300 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 GM300. 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 GM300 logic board is significantly different from the MaxTrac logic board. It can control the RF board's local/DX circuit. 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. There are far fewer components on the board too. All GM300 logic boards have a 16-pin accessory connector. A full metal shield covers the entire logic board, just like they have for the RF board; the MaxTrac only shields the microprocessor area. This further reduces spurious emissions.

The GM300 audio amplifier drives both sides of the loudspeaker. Therefore you must NOT ground either pin 1 or pin 16 of the accessory connector. You must run two wires to an external speaker. The same circuit design and components are used on the Spectra radios and they suffer from the same restriction. Grounding either speaker lead may let out the chip's lifetime supply of smoke.

The internal loudspeaker for the GM300 (and MaxTrac/Radius) radios is p/n 5080085D03, however this part number has been replaced by p/n 5004639J01. This is a 22 ohm, 5 watt speaker that retails for around $7US in early 2009.

The GM300 power amplifier has a thermistor mounted near the final transistor, so it actually senses the heat-sink temperature. The logic board uses this to control the output power in a more reasonable way; the power will be reduced if/when the power amplifier gets hot enough, not when the microprocessor 'thinks' it's getting hot from extended use. This makes GM300 radios more suitable for repeater transmitter usage. (They still need adequate forced-air cooling.) This extra signal requires a 6-wire cable and connector between the PA and the logic board (the MaxTracs only have a 5-wire cable and connector). I have heard that you can use a GM300 PA in a MaxTrac by snipping the temperature sensor wire off the connector, but I personally would not butcher either the radio or the cable that way.

Blanking the Radio:

There doesn't seem to be a lab version of RSS for the GM300. You can fool RSS into thinking the radio is blank by manually erasing the serial number (filling it with spaces) and entering a few more bytes using the bit-banging facility available in the MaxTrac lab RSS program. After that, you should be able to initialize the radio using the GM300 RSS or write a previously saved code plug to the radio. Initialization is exactly the same as the steps you'd do for a MaxTrac: set the radio model number, frequency range, signaling features, panel number, serial number, key in the crystal data and 9.6V reading, and align the power amplifier and deviation circuits.

Note: people have used the MaxTrac lab RSS to blank GM300 radios. They then install a MaxTrac EPROM, make some changes to the logic board, and turn the radio into a MaxTrac, including the model number. Then they initialize it with MaxTrac RSS.

To blank the radio, you need to deposit the following data at the locations shown. These values came directly from a factory-fresh blank board. This data will go directly into the radio's memory. You may want to write down the contents of these locations first, incase something goes terribly wrong. Use this at your own risk. All values are hexadecimal.

After setting the memory to these values, the radio will appear blanked to the GM300 RSS, and you'll have to go through the blank board replacement procedure and either align the radio, or fill in the various fields with data that was previously there. You can also write any previously saved code plug to the radio, but make sure you use one that matches the band and number of modes.

During the first screen of the initialization procedure, you'll need to select the frequency range. Go through the entire list using the up-arrow, then go through it a second time to find the exact range. Once the correct range is chosen, you'll have no problem choosing a model number. If you don't see the expected range, go through the entire list again.

By the way, the RSS knows about two 'panel numbers' for these radios: 005 for the multi-digit (8/16 channel) radios, and 004 for the other (1/2 channel) radios, and it covers the Radius GM300, M10, M120, and M130 models.

The value at location B60C is an entry number of the Product Series in the MDF file. There are only four possible values and you must select a value for this location. The value at location B60F seems to depend on which logic board is in the radio. There's a checksum at location B611 but don't bother with it. The table below shows the values that can go into these two locations. All values are hexadecimal.

You should always record the original values or make a backup when hex-editing any radio or file.

Common Problems:

Motorola Radius Gm300 Software

For some reason, GM300s seem to be prone to losing receive sensitivity. Whether this is due to nearby excessive transmitter power or operator error, the eventual cause seems to be either shorted protection diodes across the receiver's input, or a dead first RF amplifier transistor. All of these components require removal of the RF board to access them, but replacement is quite easy. They're surface-mount, of course.

Another common issue is a dead 2nd oscillator crystal. This operates at 44.645 MHz and is used to convert the 45.1 MHz intermediate frequency signal down to 455 kHz for the detector. When the crystal dies, the receiver will hear absolutely nothing. If you have a receiver capable of hearing the crystal frequency, you can pick it up if you remove the shield from the RF board and place the antenna within a few inches of the left side of the radio. If you don't hear the 44.645 MHz signal, the crystal needs to be replaced. These can often be found on a popular auction web site. The Motorola p/n is 48-80008K02 and the crystals are marked '44.645/08K02' so you know they're the right ones.

These radios often go way off frequency, to the point that the warp adjustment will not get it back where it belongs. The cause is most often dirty interconnection pins inside the radio. These are between the RF board and the logic board. On the MaxTrac, they are attached to the logic board; on the GM300 the strip of pins is mounted on the chassis and both boards plug into it. Remove both boards, clean these pins, and reinstall the boards. While the radio is apart, clean the front panel connectors too. These same connectors get dirty on MaxTracs as well, but for some reason they don't often cause serious problems like they do on the GM300. See this article for details and photographs.

Reference Oscillator Coarse Adjustment Procedure:

Rather than type this paragraph, here it is directly from the service manual. This same procedure (with different part references) could also be used with MaxTrac radios.

Manuals and RSS:

• GM300 8-channel Operator's Card, 6880902Z26
• GM300 16-channel Operator's Card, 6880902Z41
• GM300 Owner's Manual, 6880902Z09
• GM300 Service Manual, 6880902Z32
• GM300 RSS, HVN8177F
• GM300 RSS Manual, 6880902Z36

Acknowledgements and Credits:

Dave N1OFJ supplied the GM300 and MaxTrac 50 radios. These photos were taken at his shack.

All photographs were taken, and are copyright, by the author.

Much of the information for this article, and the scanned pages, were obtained from the official Motorola GM300 Service Manual.

A few tidbits of information were gathered from Internet sources.

GM300, MaxTrac, Radius, RSS, PL, DPL, MDC, and probably a bunch of other things, are trademarks of Motorola, Inc.

Contact Information:

The author can be contacted at: his-callsign [ at ] comcast [ dot ] net.

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This article first posted 28-Sep-2006.
This page was last updated on 06-Dec-2015

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.

Radio Doctor For Motorola Radius Gm300 Manual

Attention Ebay buyers and sellers: If you are buying or selling a MaxTrac, Radius mobile, or GM300 you need to read the warning on this page.

Any Motorola prices mentioned on this page (or on any page at this web site) should be taken only as a rough guideline. Motorola adjusts prices quarterly, and offers one set of prices to their dealers/service shops (the so called 'NSO' Pricing ('National Service Organization')), another to 'self-maintaining' fleet customers (i.e. those that have their own radio shops... cities, counties, police departments, fire departments, etc) and a third on their telephone order desk (i.e. retail sales to the public). Prices are changed quarterly, so use the mentioned prices only as a rough indication. If you encounter a large price change on anything where we've mentioned a price we'd appreciate an emailed update.

Radio Modification and Descriptive Articles:

Caution: A lot of the information in the articles below is valid only for MaxTracs and MaxTrac-based Radius radios (the Radius mobiles that have the letters LRA in the middle of the model number). The MaxTracs came first, then when Motorola needed radios to sell as Radius models (i.e. retail sales products) they changed the label and the firmware. There are some very slight differences, but there is a lot of commonality between the hardware (the circuit boards, etc) inside the MaxTrac and Radius LRA series mobiles.

The later GM300 series (which includes the Radius M10, M120 and M130 radios) look a lot like the MaxTrac and Radius LRA series, have similar specifications and physical construction, but are actually quite different internally. The GM300 series do not respond well to being blanked by the MaxTrac Lab RSS. There is no Radius or GM300 series Lab RSS floating around (yet) so unsuspecting experimenters can turn one of these radios into an expensive brick if not careful. See the GM300 article below for more details.

Astron makes a power supply for the MaxTrac / Radius LRA / GM300 series that has a sleeve on the top that the radio slides into. The SL-11-RRA supplies 13.8V at 11 amps. Click here for a photo.

Note that the MaxTrac / Radius / GM300 radios have a 10% transmit duty cycle and that translates to 10 seconds of transmit and 90 seconds of receive, or 30 seconds of transmit and 4.5 minutes of receive. This is definitely not repeater service or any kind of amateur radio service that I'm familiar with! And besides, the rear mounted heat sink does not cool the pin diodes or any other PC-board mounted components. Reducing the transmit power can help, but some models have a minimum rated power level (like not less than 25 watts and not more than 45 watts). In other words, the MaxTrac, Radius and GM300 are nowhere near the conservatively rated and over-heat-sinked designs of the MICOR, Syntor or Mitrek era radios.

Model-Specific Articles:

Some additional GM300 information is available from Colin Lowe G1IVG at http://www.g1ivg.com/motgm300.htm (offsite link).

Interfacing Articles:

Modification and Repair Articles:

Manuals and Documentation: If anybody wants to contribute additional part numbers (or even manual scans) we will post them.

Motorola Radius Gm300 Radio Doctor For Windows 2000/xp

Parts Catalogs:

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This page originally posted 05-Jan-2005

Credits and Acknowledgements:
MaxTrac, Radius, GM300, Spectra, GT, GTX, GR300, GR400, GR500, Hear Clear, Radio Service Software, RSS and many other names are trademarks of Motorola Inc.
Front-view photos of the two-channel and multi-channel radios at the top of the pageby Robert Meister WA1MIK.
Edited text, artistic layout, and the hand-coded HTML is ©Copyright 2005 and date of last update by Mike Morris WA6ILQ.

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.