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The FM/AM-1200S/A receiver is a triple conversion, superheterodyne
receiver,
capa~le
of monitoring communication signals within a range of
250 kHz to 999.9999 MHz, in 100 Hz steps.
Signals may be received
''off-the-air'' using an external antenna or by direct cable connection
through the front panel T/R Connector.
Associaterl receiver monitoring
circuits include a frequency error meter, modulation meter, power meter,
SINAD meter, signal strength meter, frequency error and demodulaterl
audio counters, oscilloscope and spectrum analyzer (FM/AM-1200S only).
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FM/ AM-1200 S/ A CAPABILITIES
A prime feature of the FM/AM-1200S/A is the capability of testing both
simplex and rluplex communication equipment.
Simplex operation is
defined as any equipment that communicates in only one direction at a
time on the same frequency, including ordinary transmit-receive or
press-to-talk operation, voice operated carrier anrl other forms of
manual or automatic switching from transmit to receive.
Duplex opera-
tion is characteristic of any equipment which transmits on one frequency
anrl receives on another frequency between two locations, such as mobile
telephone systems and repeaters.
In receive mode, the FM/AM-12005/A receiver monitors incoming signals
received "off-the-air" or applied via rlirect cable connection through
the front panel T/R Connector.
In this mode, the FM/AM-12005/A signal
generator is inactive.
In the generate mode, the FM/AM-12005/A is
capable of generating modulaterl or unmodulated carrier signals while the
receiver circuits are simultaneously monitoring the generator.
In the duplex mode, the FM/AM-12005/A has the capability of generating
and receiving signals simultaneously.
While the receiver section of the
FM/AM-12005/A is monitoring incoming signals transmitted by the UUT, the
FM/AM-12005/A duplex generator is simultaneously generating signals to
stimulate the receiver section of the UUT.
The frequency of the
generated signal from the FM/AM-12005/A can be offset up to ±49.99 MHz
from the receiving frequency in 10 kHz steps.
Three methods of duplex
testing are available using the FM/AM-12005/A.
They are:
Duplex Testing using separate Transmit/Receive Lines
Duplex Testing using one common Transmit/Receive Line
"Off-the-air" Duplex testing
The methods of duplex testing are described in detail in Section 4.
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