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4-7-7
SELECTING ''DUPLEX HIGH'' OR ''DUPLEX LOW'' {FM/AM-1200S ONLY)
STEP
PROCEDURE
------------------------------------------------------------------------
1.
Place MODE Selector Control (39) to ''DUP'' position.
2.
Press
2ND
-
F UNCT
1•1
to select DUPLEX HIGH (-15 dBm ±10 dB) or
OPT
a.
The VFD will display:
or
b.
The word "ON" following one of these selections will
indicate the presently selected DUPLEX operating mode.
the
[;r
0
1
~
and
l-c' I
3.
Use
~
""'"'
to rotate between the two modes as
4.
displayed on the VFD.
Press
~
to change from the current operating mode to the
one displayed on the VFD.
The word ''ON'' will appear on that
display.
If no key is pressed within 5 seconds after the
"DUPLEX HIGH'' or ''DUPLEX LOW'' message appears on
•
the VFD, the FM/AM-1200S will default to its
;
last setting and VFD display.
;
4-7-8
DUPLEX TESTING METHODS (FM/AM-1200S ONLY)
Three possible methods of UUT Duplex Testing using the FM/AM-1200S are:
A.
DUPLEX TESTING USING SEPARATE TRANSMIT/RECEIVE LINES (FULL DUPLEX
OPERATION)
4-43a
05
In this mode, the UUT transmitter output is applied to the
FM/AM-1200S at the T/R Connector (11).
The FM/AM-1200S offset
generator output (available at the DUPLEX Output Connector (14)),
at a fixed level, is applied to the RF input of the UUT
receiver.
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