Hkkn4001 External Duplexer Cable Kit; Hkkn4002 Internal Duplexer Cable Kit; Duplexer (Internally Mounted); Preselector (Optional) - Motorola CDR500 Programming Manual

CDR500 Wall Mount Repeater Station

Disassembling the CDR500 Repeater Housing

HKKN4001 External Duplexer Cable Kit

The two (2) RF cables in this kit provide connection
between the mini-UHF RF antenna connectors on the
Professional Series transceivers and type-N bulkhead
female connectors that mount on the back panel of the
CDR500 repeater housing. Use this kit if the repeater
has separate transmit and receive antennas, a transmit
combiner/receiver multi-coupler system or a duplexer
that is not capable of being mounted inside the
CDR500 repeater housing.

HKKN4002 Internal Duplexer Cable Kit

Two (2) of the three (3) RF cables in this kit provide con-
nection between the mini-UHF RF antenna connectors
on the Professional Series transceivers and the type-N
connectors on the receiver and transmitter ports of an
internally mounted duplexer. The third cable provides
the connections between the type-N antenna connector
of the duplexer and a type-N bulkhead female on the
back panel of the CDR500 repeater housing.

Duplexer (internally mounted)

There are several duplexers available from Motorola
that can be mounted inside the CDR500 repeater hous-
ing. The radio/duplexer bracket has the mounting
hole pattern to accommodate these duplexers. Please
note that the minimum transmit to receive frequency
spacing is 4.5 MHz for VHF models and either 5 MHz
(444-470 MHz) or 3 MHz (above 470 MHz) for the UHF
models of the duplexers.

Preselector (Optional)

The preselector is a filter that allows a relatively nar-
row range of frequencies to pass through to the
receiver while rejecting all other frequencies. In loca-
tions of high RF congestion, the preselector can reduce
interference from intermodulation, desensitization and
spurious responses. The preselector is placed in series
with the input of the receive radio from the duplexer or
a separate receive antenna. The preselector should be
tuned before mounting into the CDR500 repeater hous-
ing.
Disassembling the CDR500
Repeater Housing
(Refer to Figure 2-2 on page 2-3)
NOTE
Unless specifically instructed otherwise,
DO NOT discard any hardware removed
during disassembly.
1. Turn the quarter-turn front cover fasteners
counterclockwise to open the front cover.
2. Remove the bag(s) of hardware and cables
from the housing.
2-2
3. With appropriate socket tools perform the fol-
lowing:
3A. Remove the 8-32 nuts that secure the front of
the radio/duplexer bracket in the CDR500
repeater housing.
3B. Loosen, but do not entirely remove, the 8-32
nuts that secure the back of the radio/
duplexer bracket (this is the end of the
bracket with notched mounting tabs).
3C. Remove the radio/duplexer bracket.
3D. Remove the two 8-32 screws that secure the
repeater controller bracket to the front of the
power supply module.
3E. Loosen, but do not entirely remove, the two
8-32 screws that secure the back of the
repeater controller bracket to the top of the
power supply module (this is the end of the
bracket with notched mounting tabs).
3F. Remove the repeater controller bracket.
Assembling the CDR500 Repeater
Housing

Installing the Optional Duplexer RF Cables

1. If you are installing the optional external
duplexer RF cable kit, locate kit HKKN4001.
Remove the two RF cables from the bag.
2. The short (10"/25.4cm) cable (30-80517U05)
connects to the transmit radio.
3. The long (15"/38.1cm) cable (30-80517U10)
connects to the receive radio.
4. If you are installing the optional internal
duplexer RF cable kit, locate kit HKKN4002.
Remove the three RF cables from the bag.
5. The cable with the type-N male and type-N
female bulkhead cable connectors is the
antenna cable from the internal duplexer.
6. The long (14"/35.6cm) type-N male to mini-
UHF connector cable (30-80517U11) connects
to the transmit radio.
7. The short (12"/30.5cm) type-N male to mini-
UHF connector cable (30-80517U07) connects
to the receive radio.
6864110R66-O
CDR500 & CDR700 Repeater Service Manual
March, 2001