IFR FM/AM-1200A

SECTION 1 - INTRODUCTION
1-1 GENERAL
The FM/AM-1200S/A is a microprocessor controlled, rligitally synthesized
communication service monitor, which integrates the functions of several
different test instruments into a single, compact and portable unit.
Utilizing such features as a keyboard entry system, a Vacuum Fluorescent
Display for digital readout, processor controlled memory functions, a
CRT capable of displaying oscilloscope inputs and a DTMF encoder used
simultaneously with the variable audio generator for audio tone
encoding, the FM/AM-1200S/A incorporates the functions of the following
test equipment:
Signal Generator
Communication Receiver
Digital Voltmeter (Option)
Oscilloscope
1 kHz (Fixed) Tone Generator
Variable Tone Generator
(Programmable)
DTMF Encoder
DTMF Decoder (Option)
Power Meter
Frequency Error Meter
Modulation Meter
SINAD Meter
Audio Error Meter
Signal Strength Meter
DUPLEX Generator (with
a selectable offset)
Spectrum Analyzer
(FM/AM-1200S only)
Tracking Generator (Option,
FM/AM-1200S only)
These capabilities enable the FM/AM-1200S/A to be used in a wide range
of communication test functions associated with most types of simplex
and duplex transceiving equipment, including mobile telephone systems,
AM/FM/SSB transceivers, CB and two-way radio systems, repeaters, etc.
1-2 SIGNAL GENERATOR/RECEIVER
The FM/AM-1200S/A Signal Generator is capable of generating modulated or
unmodulated carrier signals within a range of 250 kHz to g99.9999 MHz
(in 100 Hz steps\, at an output level which is continuously variable
from -20 to -127 dBm. The generated tarrier signal may be AM or FM
modulated by internal modulation signals from the FM/AM-1200S/A tone
generators or by external sources applied through front panel modulation
input connectors defined in Section 3 of this manual. The signal
generator may also be voice-modulated and keyed through the front panel
microphone input connector. All of the above described modulation
sources, or any combination thereof, may be simultaneously applied to
the carrier signal. During signal generator operation, signals being
generated can be monitored by the FM/AM-1200S/A receiver and its
associated monitoring devices.
The signal generator also features a selectable offset frequency func-
tion to permit testing of duplex equipment, which receives and transmits
simultaneously on different frequencies. See paragraph 1-3 for addi-
tional information about this feature.
1- 1
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