HP 70000 series, User Manual

Page: 384 / 447

Rear-P anel P orts
Figure B-21. HP 70907A/B external mixer interface moduleU;, Rear View
TUNE SP AN receives the tune span signal from the LO .
In an HP 70907A external mixer interface module this signal controls the
frequency of the voltage-tuned-calibrator-oscillator in the external mixer .
In an HP 70907B external mixer interface module , this LO tune span signal
is summed with the Preselector P eak D A C to obtain the front panel PRESEL
TUNE/SP AN signal. See front panel ports . The frequency variations of
the 321.4 MHz calibration source are controlled in another manner in an
HP 70907B external mixer interface module .
21.4 MHz OUT provides the 21.4 MHz IF signal for routing to the IF sections for ltering and
detection.
321.4 MHz
OUT
provides an auxiliary IF output that tracks the 21.4 MHz OUT .
300 MHz IN receives the phase-lock signal generated by the HP 70900B local oscillator
source .
300 MHz OUT provides a feed-through path for the local oscillator-generated 300 MHz signal,
allowing the conguration of additional RF sections , tracking generators , or
EMIMs .
LO IN receives the 3.0 to 6.6 GHz signal from the HP 70900B local oscillator source .
LO OUT provides a feed-through path for the local oscillator-generated 3.0 to 6.6 GHz
signal, allowing the conguration of additional modules that require an LO IN
signal. If not used this output connector should be terminated in 50 .
Input and Output P orts B-29