Specifications

1–5
Getting Acquainted
1.2.5 Translator
A receiver configuration (FM500R, for example) takes an exciter configuration and
adds receiver circuitry as well. This added feature makes the FM500 ideal for
translator service in terrestrial-fed networks. These networks represent a popular
and effective way to increase your broadcasting coverage. Translators, acting as
repeater emitters, are necessary links in this chain of events.
Traditionally, network engineers have relied on multiple steps and multiple pieces
of equipment to accomplish the task. Others have integrated the translator
function (receiver and exciter) to feed an amplifier. Crown, on the other hand,
starts with an integrated transmitter and adds a solid-state Receiver Module to
form the ideal translator.
Illustration 1–3 Crown's Integrated Translator
This option enables RF in and RF out on any of Crown’s FM series of transmitters.
In addition, the module supplies a composite output to the RF exciter portion of
the transmitter. From here, the signal is brought to full power by the built-in
power amplifier for retransmission. The Receiver Module has been specifically
designed to handle SCA channel output up to 100 kHz for audio and high-speed
data.
FSK ID programming is built-in to ensure compliance with FCC regulations
regarding the on-air identification of translators. Simply specify the call sign of
the repeater station when ordering. Should you need to change the location of the
translator, replacement FSK chips are available. The Receiver Module option
should be ordered at the time of initial transmitter purchase. However, an option
kit is available for field converting existing Crown units.
Stereo
Generator
RF IN
Receiver Module
(option)
RF Out
Low-pass Filter
Metering
RF Exciter
FM500
FM BROADCAST TRANSMITTER
®
Power
Carrier
Modulation
Fault
Stereo
Mono RF Output
ProcessingInput Gain
Wide Band
High Band
Audio Input
High
Low
2
-6
-12
-18
2
+6 dB
+12 dB
10
20
Expand
Compress
RF Power
SWR
ALC
PA DC Volts
PA DC Amps
PA Temperature
Supply DC Volts
Voltmeter
SWR
Lock
Input
PA DC
PA Temp
Over
100
90
80
70
60
50
40
30
20
Pilot