HP 70000 series, User Manual

Page: 387 / 447

Rear-P anel P orts
Figure B-24. HP 70909A RF Section Rear P anel
1ST LO IN receives the 3.0 to 6.6 GHz signal generated by the HP 70900B local
oscillator source .
1ST LO OUT (rst local oscillator output) is the 3.0 to 6.6 GHz signal generated
by the HP 70900B local oscillator source . The frequency depends
on the spectrum analyzer measurement range or the settings of the
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LO OSC START and
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LO OSC STOP keys .
TUNE SP AN input is a voltage ramp with varying slope and dc level that is
generated by the HP 70900B local oscillator source . The ramp assists in
the control of the preselector in the HP 70909A RF section. The ramp
also controls the tuning frequency of the tracking generator , external
mixer interface , or preselector modules , if they are in the system.
321.4 MHz OUT has a bandwidth of about 30 MHz and provides a wide-bandwidth IF
output that is approximately 5 dB higher in amplitude than the RF
INPUT signal. The intended use for this output is for receiver products
that utilize wide-bandwith signal processing.
300 MHz IN receives the 300 MHz signal from the HP 70900B local oscillator source
for phase locking.
21.4 MHz OUT is the 21.4 MHz IF signal, which is routed to the IF section for ltering
and detection.
B-32 Input and Output P orts