Chapter 2 119
Front-Panel Key Reference
Input/Output
number as “– 8”. The minus sign
indicates that the tuned frequency is
below the desired LO harmonic by the
IF of 321.4 MHz. Similarly, if the
harmonic mode of the external mixer is
listed as “8 +”, enter the harmonic
number as “8”.
Key Access:
Input/Output, Input Mixer,
Mixer Config
Mixer Type
Presel Unpre
Allows you to select which type of mixer
is in use.
Mixer Type (Presel) activates a
tuning signal that is routed to the
PRESEL TUNE OUTPUT connector on the
rear panel of the analyzer. This signal
has a sensitivity of 1.5V/GHz of the LO
frequency and drives the tune input of
the HP/Agilent 11974 series of
preselected mixers. The sweep rate in
Presel mode is limited to 40 MHz/msec.
Key Access:
Input/Output, Input Mixer,
Mixer Config
Mixer Bias
On Off
Mixer Bias (On) activates and allows
adjustment of an internal bias source
for use with external mixers. The bias
signal is present on the center
conductor of the IF INPUT connector
on the front panel. The mixer bias will
be
Off if Harmonic (Auto) and
Mixer Type (Presel) is selected.
Key Access:
Input/Output, Input Mixer,
Mixer Config
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