HP 70000 series, User Manual

Page: 360 / 447

3.6214 GHz IN
and OUT
are normally connected. They may be disconnected to oset the
tracking-generator output up to 30 MHz (nominal) by applying a signal between
3.5914 to 3.6514 GHz. Note that breaking the connection between the 3.6214
GHz INPUT and OUTPUT yields unleveled amplitude levels at the RF OUTPUT
unless the output level is sensed with an external negative detector . Route the
sensed output level to EXTERNAL ALC IN.
21.4 MHz
IN/OUT
receives an external 21.4 MHz signal for mixing with the local oscillator
signal. A signal between 11.4 and 31.4 MHz may be applied to oset the
tracking-generator output.
0{2.9 GHz
IN/OUT
are normally connected. They may be disconnected to access the tracking
generator output at the rear panel, but note the 0{2.9 GHz OUTPUT is not
leveled according to specications . Signals beyond 10 MHz are unleveled.
Signals between 20 Hz and 10 MHz are leveled, but not according to
specications because the disconnection does not permit compensation for
the step attenuator . If desired, the 0{2.9 GHz output may be sensed with a
negative diode . Return the sensed level to the EXT ALC INPUT .
SWEEP +
TUNE
receives the tuning-voltage from the HP 70900B local oscillator source . The
tuning voltage is applied to the automatic-level-control circuitry in the tracking
generator .
SWEEP IN receives the 0{10 V ramp which is applied to the automatic-level-control
circuitry in the tracking generator .
300 MHz IN receives the 300 MHz signal from the HP 70900B local oscillator source for
phase-locking the tracking generator with the spectrum analyzer .
300 MHz OUT is the 300 MHz IN signal, leveled to a constant amplitude .
LO IN mixes with the tracking-generator internal oscillator to produce the RF
OUTPUT (source) signal.
LO OUT (rst local oscillator output) provides 3.0 to 6.6 GHz, depending on the
spectrum analyzer measurement range or the settings of the
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
LO OSC START
and
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
LO OSC STOP keys . The signal is generated by the HP 70900B local
oscillator source .
HSWP IN is a 0 to +5 V square wave that is high during the sweep and low between
sweeps . T o disable the sweep , the port may be held low .
Input and Output P orts B-5