1
INTRODUCTION
1.1
GENERAL
The DTX Plus Series II modem is a wireless modem designed to operate on the frequency bands at VHF,
UHF, and 220 MHz. It supports over-the-air data rates of 4800 bps in a 5.0/6.25/7.5 kHz channel, 9600 bps
in a 12.5/15 kHz channel, and 19.2 kbps in a 25/30 kHz channel. The modem supports three protocols, the
legacy packet protocol of the DTXM-X54 series, a small-packet streaming protocol, and a no-overhead
streaming protocol with no error detection/correction. Besides offering data communications, the DTX Plus
modem includes voice transceiver audio input and outputs. The complete modem transceiver is housed in
the standard DTX Plus case, resulting in a light, compact package.
1.2
MODEL IDENTIFICATION
The DTX Plus modem has a part number in the form of “DTXM-A60-BCDEF”
Where:
A is the major frequency band designator:
1=VHF (136-174 MHz)
2=217-245 MHz
3=340-400 MHz
4=UHF (400-520 MHz)
B is the sub-band designator:
G=340-360 and 400-420
A=420-440
B=430-450
0=136-174, 217-245, 360-380, and 450-470
M=380-400
C=470-490
T=490-512
C is the connector designator:
B=BNC connector
M= MCX connector
S=SMA connector
D designates the channel bandwidth:
S=6.25 kHz
N=12.5 kHz
W=25 kHz
E designates the maximum power level:
3=3 watts
6=6 watts
9=10 watts
