March, 2001
6864110R66-O
1-3
CDR500 & CDR700 Repeater Service Manual
Introduction to Repeaters and Components
Accessories
• one inside the CDR500 repeater, which connects
power to the radios (the controllers obtain
power from one or both of the radios), and the
fan
• one outside the CDR500 repeater, which con-
nects to an external battery
• one IEC ac receptacle for various line cords (US
standard, 3-prong 115 V ac cord provided).
CDR700 Repeater Power Supply
The CDR700 repeater operates using voltages gener-
ated by the HPN9033 or HKPN4000 power supply. The
power supply operates from a 115/230 Vac (switch
selected) power source. The power supply provides
power for the fan assembly and both radios. The power
to the repeater interface component is obtained from
one of the radios. To secure the power supply to the
housing, mounting screw holes are located on each
side of the power supply. The power supply has three
connectors:
• one pigtail with a 2-prong “Ford” connector to
m a t e w i t h t h e Y- s p l i t p o w e r c a b l e ( 3 0 -
85859M01) to power the radios.
• one pigtail with a 6-position connector to power
the fan.
• one IEC ac receptacle for various line cords (U.S.
standard, 3-prong, 115 Vac cord provided).
A slide switch on the power supply allows thermal
control or continuous ON fan operation.
Repeater Controllers
Except for the Basic Controller, the other repeater con-
trollers appear almost identical. They each have
mounting screw holes on each side with which to
secure them to the CDR500 or CDR700 repeater hous-
ings. The Basic Controller, because of its smaller size,
cannot be directly installed into either repeater hous-
ing. Instead, it comes mounted on a tray which is
placed into the repeater housing. The Basic Controller
is supplied with a masking shroud for use in the
CDR700 repeater. The shroud is not needed in the
CDR500 repeater.
Connectors for cabling between the radios and the
repeater controller(s) are located on the back of each
component. Operating power for the interface compo-
nents is obtained from one or both of the radios. LEDs,
Set-Up
controls, and a Programming modular jack
(where applicable) are located on the front of the
repeater controllers.
Receive and Transmit Radios
Any of the Professional Series radios may be used to
assemble a mobile radio based repeater.
NOTE
In the United States of America, the Fed-
eral Communications Commission
(FCC) requires a frequency stability of
±
1.5-ppm for 12.5 kHz repeaters at UHF
(450-512 MHz). Contact Motorola Cus-
tomer Resources Technical Support for a
possible solution.
The Professional Series radios have a mounting screw
hole on each side in which to secure the radios to the
CDR500 or CDR700 repeater housing. Connectors for
interconnecting the radios between the duplexer and
the corresponding repeater controller(s) are located at
the back. Controls, indicators, and the microphone
connector are located on the front panel. A top cover
provides entrance into the radios for maintenance. You
should not remove this cover except for maintenance
purposes.
Duplexer (optional)
The duplexer allows the Professional Series radios to
operate simultaneously in the same frequency band
with a single antenna and transmission line. Without
the duplexer installed in the CDR500 or CDR700
repeater, it would be necessary to use two antennas
spaced apart, with one connected to the receive radio
and the other to the transmit radio. The duplexer
mounts inside the repeater housing. The position of the
mounting holes can vary, depending upon the type of
duplexer used. RF connectors are on the rear of the
duplexer, and tuning adjustments are on the front.
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
may be tuned before mounting into the CDR500 or
CDR700 repeater housing.
NOTE
The internal space of the CDR700
repeater allows mounting of a duplexer
OR a preselector, but not both.
Accessories
Many of the Professional Series radio accessories are
compatible with the CDR500 and CDR700 repeaters.
However, some of the accessories which plug into the
radio style accessory connector are not compatible,
because some of the functions needed are not available.
Table 1-3 shows compatibility for the audio and DTMF
Summary of Contents for CDR500
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