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4-7-1
GENERAL
In the Duplex mode of operation, the FM/AM-12005/A has the capability of
generating and receiving signals simultaneously.
While the FM/AM-
1200S/A receiver is monitoring the power, modulation and frequency
characteristics of the UUT transmitter, the FM/AM-1200S/A offset genera-
tor is simultaneously transmitting to the UUT receiver with a signal at
a fixed output level.
This signal is not affected by the operation of
the UUT transmitter.
FM/AM-1200S/A duplexer accuracy (setting up on
desired frequency) is ±1.3 kHz
The FM/AM-1200S/A contains a duplex system which
is FM modulated only.
The FM/AM-1200A has an output level at the
DUPLEX Output Connector of -60 dBm ±10 dB.
The FM/AM-1200S has two output levels available
at the DUPLEX Output Connector:
DUPLEX HIGH Mode:
DUPLEX LOW Mode:
-15 dBm (±lO dB)
~
±49.q9 MHz
from Receive Frequency
-25 dB below DUPLEX HIGH at
the same frequency
Perform the procedure in paragraph 4-6-3 ''GENERATING FM MODULATED
SIGNALS'' before continuing on with this procedure.
!NOTE!
4-7-2 through 4-7-6 apply to FM/AM-1200A Duplex
operation only.
4-7-7 through 4-7-10 apply to FM/AM-1200S Duplex
operation only.
4-7-2
DUPLEX TESTING USING SEPARATE TRANSMIT/RECEIVE LINES (FULL DUPLEX
OPERATION) (FM/AM-1200A ONLY)
In this mode, the UUT transmitter output is applied to the FM/AM-1200A
at the T/R Connector (11).
The FM/AM-1200A offset generator output
(available at the DUPLEX Output Connector (14)), at a fixed level, is
applied to the RF input of the UUT receiver.
fCAUTION!
DO NOT TRANSMIT INTO DUPLEX OUTPUT CONNECTOR
(14), AS CONNECTOR IS NOT PROTECTED AGAINST RF
INPUTS ABOVE 0.25 WATTS.
4-41
04
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