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3
Section I
INTRODUCTION
MODEL 540 PRODUCT DESCRIPTION
General
Inovonics’ Model 540 enables accurate measurement and monitoring of
FM broadcast subcarriers. These may include speech and music “SCA”
(Subsidiary Carrier Authorization) transmissions, “RDS” (Radio Data
System) information, and various existing-and-proposed “high-speed”
digital services which provide paging and other one-way data
communications.
The 540 accepts the demodulated FM “baseband” signal feed from any
Modulation Monitor. It is frequency-agile, tuning any subcarrier
frequency between 54kHz and 99kHz with digital precision. Bargraph
metering displays subcarrier injection, as well as subcarrier deviation
for SCA audio transmissions. Demodulated SCA audio may be
monitored with headphones and is available at a rear-panel connector
as well.
FCC Type
Acceptance
Equipment for monitoring broadcast transmissions in the U.S. no
longer requires “type acceptance” by the Federal Communications
Commission. Though rules pertaining to
monitoring equipment
have
been relaxed or abandoned, the broadcaster remains responsible in
ensuring that his
transmitted signal
conforms to current FCC
regulations.
Features
Features of the Inovonics 540 include:
•
Works with any FM Mod-Monitor having a composite-
baseband (MPX) output. Easily calibrated with built-
in CAL facility.
•
Measures injection level of SCA, RDS and high-speed
data subcarriers.
•
Demodulates audio SCAs and accurately displays
subcarrier deviation.
•
Triple-conversion design with precise, crystal-
controlled digital tuning. Dual IF bandwidth gives
optimum selectivity.
•
An optional RDS data decoder module is available, and
is supplied with comprehensive radio-data analysis
software.