User's Manual

1 INTRODUCTION
1.1 GENERAL
The RITRON High Power DTX Plus modules are programmable 2-way radios, which operate either in the
VHF or UHF professional FM communications bands as well as a number of other bands in the 220 MHz
and 350 MHz region. Each of eight channels can be programmed to contain a unique set of operating
frequencies. The High Power DTX Plus module is made up of two PC boards, an RF board and a
control/loader board. These two boards are enclosed in a metal case with two connectors on one end; a 50
ohm BNC connector for connection to an antenna and a DB-15 sub-miniature connector for control
input/output and a power input connector on the other end.
In addition, the RF board/heat sink assembly is available as a stand-alone unit for system integrators.
1.2 MODEL IDENTIFICATION
The part number system for the High Power DTX Plus module is as follows:
The module has a part number in the form of “DTX-A65-BCDEF” where:
A is the major frequency band designator:
1=VHF (136-174 MHz bands)
2=216-222 MHz band
3=340-400 MHz bands
4=UHF (400-430 MHz and 450-470 MHz bands)
B is the sub-band designator:
G=136-162 for #1 above , 340-360 MHz for #3 above, and 400-430 MHz for #4 above.
A=420-440
B=430-450
O=148-174 for #1 above, 216-222 for #2 above, 360-380 for #3 above, and 450-470 for #4 above.
M=380-400 for #3 above.
C=470-490
T=490-512
Note that not all of the sub-bands listed above may be available, and that other sub-bands may
become available.
C is the connector designator:
B=BNC connector
D designates the IF bandwidth:
W=wide (25/30 kHz channel bandwidth)
N=narrow (12.5/15 kHz channel bandwidth)
S=very narrow (5/ 6.25/ 7.5 kHz channel bandwidth)
E designates the maximum power level:
30=30 watts
F designates whether the control/loader board has a regulator and if so, at what current level:
I=high current regulator; the unit operates from 10-15 volts at 30 watts max.
Example: A DTX-265-OBN30I would be a VHF module for operation between 216 and 222 MHz with a
BNC RF connector, narrow (12.5 kHz channel bandwidth) IF bandwidth, 30 watts maximum output power,
and an internal regulator to allow operation from 10 to 15 volts.
The part number system for a stand-alone RF board/Heat Sink assembly is the same as that for a module
except that “F” designator (regulator option) does not exist and a “D” is appended at the end.