The specific entry fields are as follows:
Preset
The preset function is the same as in the
Monitor mode.
B/W
Selects either wide or narrow bandwidth of
the unit via softkey selection.
Freq
Enter the desired generate RF frequency
using keypad or TUNING knob.
Output Lvl
Selects generator output level in 0.1 dBm
steps over the range of -130 dBm to 0 dBm.
An alternate display of generate level in
microvolts is available in the "Meter:" area of
the Display Zone. Output level is available in
two ranges depending upon which output
port is selected:
The range of -80 dBm to 0 dBm is available
when the high level GEN OUT port is selected.
The range of -130 dBm to -50 dBm is avail-
able when the RF I/O output port is selected.
Gen RF Out
Selects the RF output port via softkeys. The
RF I/O port is recommended for most
applications. GEN and MON ports are com-
bined for a single connection to the radio
under test. The GEN port is recommended
where higher levels are needed. Selection of
the GEN port is indicated by a red LED
adjacent to the GEN OUT connector.
CAUTION
Do not apply input power to the GEN OUT
port. In the event RF power is inadvertently
applied, the port is protected by an in-line
RF fuse. This fuse may be accessed by
unscrewing the front of the BNC connector
out of the front panel.
17-8.3 DUPLEX Mode
The Duplex Mode (figure 17-13) provides a
sim
ultaneous RF generator BER pattern output
that is offset in frequency from the monitor
center frequency and fully adjustable in output
level.
This capability provides for servicing full
duplex radio equipment as well as repeaters and
radios operating with offset transmit and
receive frequencies. The Display zone provides
softkey selections for generated or monitored
clear baseband signal as shown in figure 3-12.
Specific controls which further configure the
Duplex mode are located within the RF Control
Zone when DUPLEX is first selected.
The specific entry fields are as follows:
Preset
The preset function is the same as in the
Monitor mode.
B/W
Selects either wide or narrow bandwidth of
the unit via softkey selection.
Mon Freq
Enter the desired monitor frequency using
keypad or tuning knob.
Offset
Enter the generator frequency offset relative
to the monitor frequency entered. Offset fre-
quencies of –999.99975 to +999.99975 MHz
are allowed, but the final generate frequency
will be constrained to 000.40000 MHz
through 999.99995 MHz. The offset
frequency is set in 2.5 kHz steps.
228
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