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Motorola GP 300 (GP300 GP-300) transceiver mods reviews programming software and diagrams

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8/10/23, 11:56 AM
Motorola GP 300 (GP300 GP-300) transceiver mods reviews programming software and diagrams
Motorola GP 300 (GP300 GP-300) transceiver mods reviews programming software and diagrams
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Motorola GP 300 (GP300 GP-300)
Programming interfaces schematics for Motorola: Motorola MAX232 programming interface, Motorola transitor programming interface
Programming software for Motorola GP 300 (GP300 GP-300) :
Motorola GP 300 Dos RSS programming software (R07.00.00)
Motorola GP 350 Dos RSS programming software (R08.01.00)
Schematics for Motorola GP 300 (GP300 GP-300) : Motorola GP 300 diagram
Mods for Mods for Motorola GP 300 (GP300 GP-300) :
Motorola GP 300 (GP300 GP-300) gp300/5 Tone out of band
Motorola GP 300 (GP300 GP-300) VHF hi-band portable
Motorola GP 300 (GP300 GP-300) Out of (any) band for HT50 / P100/ P110 / GP300 / GM300
Motorola GP 300 (GP300 GP-300) TX out of band limits
Motorola GP 300 (GP300 GP-300) How to program the radio
Motorola GP 300 (GP300 GP-300) Radio Programming, 8 to 16 channel expansion
Motorola GP 300 (GP300 GP-300) RIB-IVG (Programming Interface MkII)
Motorola GP 300 (GP300 GP-300) technical specifications : Motorola GP 300 (GP300 GP-300) technical specifications
Motorola GP 300 (GP300 GP-300) RIB-IVG (Programming Interface MkII)
WARNING:
In order to build the interface described below, you will at least require some basic electronics experience. If you don't understand, how the describ
build it. Although the described procedure is relatively simple, you could cause serious problems to both your PC and your Motorola radio. So please
own risk.
Pay attention to the polarity of the capacitors these are marked with a + in the diagram next to each capacitor. You will find that in some cases the
way around, however this is not the case, as they must be configured this way to generate the correct voltages within the MAX232.
Interface Parts List.
Item
Qty
1
2
3
4
5
6
7
8
1
1
1
1
5
2
1
1
motorola.dmz.ro/motorola/gp300-rib-ivg.php
Description
PCB (Single sided prototype board)
IC MAX232
IC 7407
IC 7805 (5v regulator)
Capacitors 1uf, 16v electrolytic
Resistors 680 ohm 1/4 watt
LED Green
LED Red
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Motorola GP 300 (GP300 GP-300) transceiver mods reviews programming software and diagrams
Component Side View
Track Side View
Download a zip file that contains an AutoCAD 14 file of the images above.
PC Connection.
In the interface drawing above you will see the numbers 2,3,4,5 & 9. These numbers represent the 9pin serial port found on most PC's today. If you
see below for the pin-out translation.
9 pin to 25 pin conversion information.
9 pin
25 pin
2---------------------------3
3---------------------------2
4---------------------------20
5---------------------------7
9---------------------------22
Radio Connection (GP300).
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Motorola GP 300 (GP300 GP-300) transceiver mods reviews programming software and diagrams
To connect to your GP300, all you have to do is temporarily connect your interface to the GND and BUS+ on the back of the radio. these connection
removed.
You will also need a external 7.5vdc supply to power the radio when you are programming it. This is connected between the 7.5 volt and GND conne
Notes:
If you have problems getting this interface to work on your GP300, then try replacing the two 680 ohm resistors that feed the LED's. If you use 4.7k
when using version R01.00.00 software I have no problems with the 680 ohm resistors, but for some reason when I ran the newer software (R08.02
codeplug etc. All I have done is replaced the 680 ohm with 4.7k ohm and it works fine now with both versions of software. You will have to experim
resistors work for you.
Simon VK4TSC encountered a problem where the GP300 being programmed/read will fail to pass data to/from the computer with an Error #2 (Seria
line with a CRO it was found that the GP300 could not properly switch the data bus, this being caused by the led/resistor combination on the data b
the radio could supply. By changing the series resistor to 1K ohm instead of 680 ohm the problem was overcome
The better solution maybe to use a spare gate from the 7407 to drive the led separately. Disconnect led cathode and link it to pin 4 of 7407, isolate
pin 2 of same chip. The original 680 ohm series resistor can be left as is. BUS+ is now isolated from the data led.
The Interface design above has been tested on the following radio's:
GM300 (Connect to the Mic socket on the front panel of the GM300)
GM350 (Connect to the Mic socket on the front panel of the GM350)
GP300 (See this page for info etc.)
Maxtrac 840 - 800 MHz Truncking Radio (Try http://www.batlabs.com for connections).
ERP implementation tools
Search For The Best ERP implementation companies. Find Out More Here.
helpwire.com
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Motorola GP 300 (GP300 GP-300) transceiver mods reviews programming software and diagrams
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