Specifications

1–2
FM500 User's Manual
I
1.1 Your Transmitter
The FM500 is a member of a family of FM stereo broadcast transmitters. Crown
transmitters are known for their modularity, ease-of-use, and reliability.
The modularity is most apparent in the standard transmitter configuration which
incorporates audio processing, stereo generation, and RF amplification without
compromised signal quality. A single Crown transmitter can replace several pieces
of equipment in a traditional system.
Ease-of-use is apparent in the user-friendly front panel interface and in the instal-
lation procedure. Simply select your operating frequency (using four rotary
switches), add an audio source, attach an antenna, connect AC power, and you're
ready to broadcast. Of course, the FM series of transmitters also feature more
sophisticated inputs and monitoring connections if needed.
Reliability is a Crown tradition. The first Crown transmitters were designed for
rigors of worldwide and potentially portable use. The modular design, quality
components, engineering approach, and high production standards ensure stable
performance.
Remote control and metering of the transmitter is made possible through a built-
in I/O port. For more direct monitoring, the front panel includes a digital multi-
meter display and status indicators. Automatic control circuitry provides protec-
tion for high VSWR as well as high current, voltage, and temperature conditions.
Illustration 1–1 FM500 Stereo Broadcast Transmitter
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