Introduction; Assemblies - HP 8340B Manual

Sweep Generator
—
YO Loop
Introduction
The inputs to this functional group
come from
the instrument processor, the 20-30 loop, and the
M/N
loop.
The
main output
is
YO RF
output.
Other
important outputs are
PRETUNE,
used to tune the
YIG
oscillator
(YO) and the A13 switched YIG-tuned multiplier (SYTM);
BVSWP
(buffered voltage
sweep),
used on the A27 level control assembly;
20-30 SWP,
used to
sweep the 20-30
loop for sweep widths
rSSMHz; and
MKR RAMP,
used as the reference for all
sweep
events.
ASSEMBLIES
The Sweep
Generator
—
YO Loop consists of the following assemblies:
Main Tuning Assemblies (Listed in Functional Order)
•
A58 Sweep Generator Assembly
•
A54 YO Pretune/Delay
Compensation Assembly
•
ASS YO
Driver Assembly
•
A47 Sense Resistor Assembly
RF
Source
•
A44 YIG Oscillator/A44A1 Bias Assembly
Feedback Loop Assemblies (Listed
in
Functional Order)
A45 Directional Coupler
AT2 15 dB Attenuator
A46 7
GHz Low-Pass Filter
A48 YO Loop Sampler Assembly
A49 YO
Loop Phase Detector Assembly
A50 YO Loop Interconnect Assembly
ASS
YO
Driver
Frequency Modulation
•
A23 FM Driver
HP 8340B/41B
Sweep Generator
-
YO
Loop D-l