HP 8340b User Manual

YO
TUNE.
Phase-locks
the
YO.
Coarse
error
correction
and
AC
noise
>
100
Hz
are
performed
by YO
TUNE
(via
the
ASS
YO
driver
and
YO
main
coil).
The
YO
frequency
is
related to
the
M/N
output frequency
and
the 20-30
MHz
reference
loop
frequency
in
the
following
way:
FYO
=
(N)(FM/N)
-
FSO-SO
Where:
FYO =°
YO
output
frequency
(MHz)
N
=
N
number
input to
the
M/N
Loop (harmonic
near
the
frequency
to
which the
YO
loop
is
tuned)
FM/N
=
MfN
'Q0?
output frequency
(MHz)
Fgo-ao
=
20-30
loop
output
frequency
(MHz)
(the
20-30
frequency
can
be
changed
in
1
Hz
steps)
The YO
TUNE
output
from
the
A49 YO
loop phase
detector
board
goes
to
the
ASS
YO
driver
where
it
is
summed
with
the
PRETUNE
voltage
from
the
AS4 YO
pretune/delay
compensation
assembly.
This
sum
is
applied
to
the
YO
main coil.
FM Coil
Drive.
This
signal provides >100
Hz
AC
error
correction
to
the
YO.
The
YO FM coil
drive from
the
A49
YO
loop
phase detector assembly
goes
to to
the
A44A1
YO
bias
assembly
and then
to
the
YO
FM
coil.
A50
YO
Loop
Interconnect
Assembly
Theory
of
Operation
The
ASO
YO
loop
interconnect
assembly
distributes
power
and signals to
the
A48 YO
sampler
assem¬
bly,
the
A49
YO
phase detector,
and
the
A44A1 YO
bias
assembly.
It
also contains
the
following
signals,
each
of which is
provided
with
a
test
point.
TP2
LOMD
low
=
FM
overmodulation
is
occurring.
TP4
HFIL
high
=
The
YIG
Oscillator
CW
filter
is
engaged.
TPS
HLEY
high
=
The
YIG
Oscillator
loop phase-lock
is
enabled.
TP7
HULY
high
=
The
YIG
Oscillator
loop
is
not
phase-locked.
The
test points
serve
two
purposes:
•
Each
test
point
can
be
used
to
monitor
the state
of the
digital
signal (The
level
will
be
somewhat
less than
the
actual
signal
level
due
to the
resistors
on
each
side
of
the
test
points).
•
The
test point
can
also
be
used to
force
a
logic
condition
to
occur
by
connecting
it
to +SV
or
ground.
Test points
are
provided
on
the
YO
loop
interconnect
assembly for each
supply
voltage
and
for
the
YO
coil
voltage.
The
ASO
YO
loop
interconnect assembly
isolates and
separately
filters
supplies going
to
different
portions of
the
YO
loop
assembly.
D-12
Sweep Generator
-
YO
Loop
Theory
of
Operation
HP
8340B/41B

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English