User's Manual

68P81093C75-A 4-1

System Applications

Local Control

The PDR 3500 is an APCO 25 digital repeater. The station is

identical in operation to the Quantar station, hence there is no local

control capability. There is no digital-to-audio translation within the

station. Local control style operation can be accomplished in several

ways:

a. A portable radio may be used as an RF control station talking to

the repeater.

b. The station may be equipped with the wireline and the modem

options and routed through a DIU to a tone remote console. The

Tone remote console controls the station via wireline through the

DIU. The wireline in this case is a local 4-wire cable.

External Duplexer

Operation

The PDR 3500 must be used with an external duplexer when

frequency spacing is less than 3 MHz. The duplexer isolation

required for proper operation is approximately 60 dB. Double-

shielded coaxial cables must be used from the repeater to the

duplexer.

Repeater RA or Cross

Band Repeater

Operation

The PDR 3500 can be conﬁgured for Repeater RA or cross band

repeater operation by adding the wireline card and the Astro modem

to the each repeater. The repeaters are connected together using the

wireline port on each repeater. The cables are terminated in RJ-45

connectors.

Repeater 1 Repeater 2

Wireline A Wireline A

Wireline B Wireline B

NOTE:

RJ-45 cables for cross band operation are 1 to 1.