HP 8340b - Assemblies; Introduction

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