User's Manual

Canam Technology, Inc. (CTI)
MARK-IV CHANNELIZED (Class A Narrowband) SIGNAL BOOSTER WITH AUTOMATIC
OUTPUT LEVEL CONTROL M4-ChOLC
User’s Operations and Maintenance Manual (O&M)
Section C. THEORY OF OPERATION
C.1 DESCRIPTION
The CTI MARK-IV CHANNELIZED REBROADCAST
SYSTEM is designed for multi-carrier two-way
rebroadcast systems, where significantly high
dynamic range is required.
The M4-ChOLC is a Narrowband Class A
(Channelized or Channel Selective) Signal
Booster with a 100 dB Automatic Output Level
Control, fully compliant with the FCC
requirements to transmit signals outdoors back
to the donor sites or basestations.
Per FCC 90.219(d) only narrowband (class A)
signal boosters can be used for that
application, the broadband BDAs are not allowed to transmit outdoors.
INPUT SPLITTER
OUTPUT COMBINER
RF INPUT
SIGNAL
RF OUTPUT
SIGNAL
CH-1 OLC
CH-2 OLC
CH-n OLC
It can also be used as a front-end filter system to
retrofit Broadband BiDirectional Amplifiers (BDAs).
Figure 1: Channelized Rebroadcast System
When several M4-ChOLC modules are combined to process multiple channels within a
desired band, the RF signals going into the BDA are set at a constant level by the 100 dB
Automatic Output Level Control, regardless of their input level, which significantly improves
the system dynamic range.
The M4-ChOLC modules reduce high power carriers that can saturate the BDAs and create
Intermodulation (IM) Products in the system. On the other hand, the M4-ChOLC modules
boost up weak carriers that would be otherwise lost in a broadband BDA system. See next
Figure 2.
The M4-ChOLC modules turn a Broadband BDA into a Narrowband Class A “channelized
BDA” that can be used to transmit signals outdoors, without the limitations set forth by the
FCC in Part 90.219(d).
M4-ChOLC modules can be programmed for processing any communications channel in
the two-way mobile radio UHF or 800 MHz SMR bands, while maintaining system flexibility.
Multiple modules are combined into a single output signal with Low-Level passive combining,
which improves BDA efficiency and cost effectiveness by reducing combiner costs.
The M4-ChOLC modules are a very cost-effective upgrade to existing BDA systems that both
improves their performance and makes them compliant with FCC 90-219(d).
Figure 2 shows, as example, the operation of an integrated system with only four M4-ChOLCs
programmed on F1, F3, F0 and F5 frequencies. The signals on F2, F4 and F6 are filtered out,
since there are no M4-ChOLCs tuned to them.
MARK-IV CHANNELIZED Signal Booster module (M4-ChOLC) O&M Manual Page 5 of 20