HP 8901B Operation And Calibration Manual page 238

Model 8901B Operation
LO Input and LO Output (Option 003)
Do
not apply greater than
40
Vdc or +5 dBm
of
RF
power into the
u )
INPUT or damage to the instrument may result. Do not apply dc voltage or
RFpower into the
LO
OUTPUT or damage to the instrument may result.
DESCRIPTION
In Modulation Analyzers with Option 003, the internal local oscillator
(LO)
signal is routed through
the rear-panel
LO
OUTPUT and
LO
INPUT connectors. The range of the
LO
signal i s 1.27 MHz t o
1301.5 MHz, at approximately 0 a m . Both connectors are 500, ac-coupled, Type-N connectors.
NOTE
The rear-panel
u)
OUTPUT
must
be connected to the rear-panel
u )
INPUT for normal Modulation Analyzer operation that w e s the internal
local oscillator.
BLOCK DIAGRAM
ATTENUATOR INPUT INPUT IF AMP
TO OTHER
MEASUREMENT
CI RCU ITS
LO
Input and
u )
Output Block Diagram
LO Input and LO Output (Option 003) 3-129