Specifications

2–5
Installation
2.4 Frequency (Channel) Selection
You may select an operating frequency of 87 to 108 MHz in the FM broadcast band
with 100 kHz channel spacing (10 kHz spacing is optional with the addition of a
fifth rotary selector switch).
To adjust the operating frequency, follow these steps:
1. Remove the top cover by removing 15 screws.
2. Locate the RF Exciter board and identify the frequency selector switches
which will be used to change the setting. See Illustrations 2–5 and 2–6.
Illustration 2–6 RF Exciter Board Frequency Selector Switches
Illustration 2–5 Top Cover Removed
Frequency Selection
Rotary Switches
Modulation
Trim-pot
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
MEGAHERTZ
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