Maxtrac|Radius Identifying Model Variations

Identifying Model Variations One thing difficult about this line of radios, it determining what radio you have in your hands without being able to read it with the appropriate RSS. This is because there is only so much information you can gain from the model number (namely band and power).

First a little bit about the model number. If you look at a typical model number, D35LRA5GB6BK, the quickest way to tell what sort of radio you have is to look at the second and third characters. They determine output power level and frequency range, respectively:

Second Character Description 0 2 Watts 2 10 Watts (900MHz) 3 25 Watt (VHF/UHF) 15 Watt (800MHz) 4 40-50 Watt (VHF) 40 Watt (UHF) 35 Watt (800/900MHz) 5 60 Watt (Low Band)

Third Character Description 1 Low Band (29.7-36.0MHz, 36.0-42.0MHz, 42.0-50.0MHz) 3 VHF (136-162MHz or 146-174MHz) 4 UHF (403-430MHz or 449-470MHz) 5 800MHz 7 900MHz

Now, in order to narrow down the actual frequency split without reading the radio. You will have to disassemble the radio, remove the top shield on the RF board and look for the part number stamped or silk screened on the PC board.

From the following chart, you should be able to determine the bandsplit of the radio:

Part Number	Bandsplit
HLB4099A	29.7-36.0MHz
HLB4100A	36.0-42.0MHz
HLB4101A	42.0-50.0MHz
HLD4321B	136-162MHz
HLD4322B	146-174MHz
HLE4424A(B)	403-430MHz
HLE4425A(B)	449-470MHz
HLE9310A(B)	449-470MHz
HLF4095B	RX 851-870MHz TX 806-825MHz
HLF9122A	RX 851-870MHz TX 806-825MHz TX 851-870MHz

The only thing left is to figure out which logic board you have. There are four different ones used in the Maxtrac series. The part number can be determined while you already have the radio apart, just locate the part number stamped on the logic board (bottom of the radio).

Part Number	Description
HLN9313A	Full Options and Signalling Capable, 16 Pin Accessory Connector, Expanded Board
HLN9123A	Basic Limited Board, No Signalling, 5 Pin Accessory Connector, Limited Channels, Masked Board
HLN5173B	Signalling Capable, 5 Pin Accessory Connector, No External EEPROM (Limited Channels), Expanded Board
HLN5172A	Same as HLN9313A, Except 5 Pin Accessory Connector

The logic boards can be found in just about any bandsplit radio. The logic board is not frequency dependent and it operation is determined by what firmware is installed in it (expanded boards), as well as what it was initialized with in the RSS.

This should give you a start on determining what radio you have in your hands. The only real way to determine the what all the options the radio is currently capable of is to read it. If you are going to be hacking on these radios, you would want to try and get one with either a 5172 or 9313 logic board in it, unless you are just building a repeater link or something.