User's Manual

TX RX Systems Inc. Manual 7-9469-1.1 06/10/09 Page 1
OVERVIEW
Signal boosters extend radio coverage into areas
where abrupt propagation losses prevent reliable
communication. The system receives an RF signal,
raises its power level, and couples it to an antenna
so that it can be re-radiated. The input signal may
be derived from a receiving antenna or a long run
of radiating coax.
The TXRX model 611-70 channelized signal
booster is designed to operate in the 450 to 470
MHz range. The system is based on a module
design with each module capable of handling one
uplink and one downlink channel simultaneously.
The size of the system can be tailored to the cus-
tomers needs by increasing or decreasing the
number of modules used. Each module is bi-direc-
tional with one downlink and one uplink signal
branch. Each of the two branches in a module are
independently tunable to their required pass fre-
quency via software interface.
The systems part number is used to describe the
configuration of the product. The first three digits
are always 611 and describe the channelized sig-
nal booster product group. The second group of
two digits describe the frequency range (450 to 470
MHz). The next two digit group describes the num-
ber of channel modules while the last letter
describes the mounting method used (the letter “A”
represents rack mounted). Specifications for the
611-70 family of channelized signal boosters are
listed in Table1.
Intermediate
Frequency
Signal
Processing
1st Mixer 2nd Mixer
RF OutRF In
Local
Oscillator
Figure 1: The down converter / up converter process.
Frequency Range 450 - 470 MHz
Number of Carriers
per Channel
1 Uplink
1 Downlink
Nominal Passband
Gain
120 dB
Channel Bandwidth
Standard 25 KHz;
can be programmed to
meet group delay require-
ments
(User Selectable)
Output Power
per Channel
+ 37 dBm ERP
Maximum Input Level -40 dBm
RF In/Out Impedance 50 Ohms
Alarms
Form-C Contacts
Module LED’s
Power
90 - 250 VAC, 50/60 Hz
or
28 VDC (+/- 5%)
Operating Temperature
Range
-30°C to +60°C
Table 1: Specifications