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Yaesu FT-101EE - Final Amplifier Stage Description; Metering Functions and Readouts Explained

Yaesu FT-101EE
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(C)
FINAL
AMPLIFIER
The
signal
from
the
transmitter
second
mixer
is
fed
to
the
grid
of
transmitter
driver
V1,
12BY7A_
where
it
is
amplified
to
a
level
sufficient
to
drive
the
final
linear
amplifier
V2
and
V3,
6JS6C°
The
signal
appear-
ing
across
T103
and
T105
is
coupled
to
the
grids
V2
and V3.
Neutralization
of
the
power
amplifier
is
accomplished
by
feeding
back
a
small
amount
of
the
output
through
TC27
to
the
bottom
of
T103/T105
combination.
Final
output
from
V2
and
V3
is
fed
to
the
antenna.
The
output
RF
voltage
is
divided
by
C28
and
C29,
and
is
rectified
by
D4,
181007
to
indicate
relative
output
power
when
the
meter
switch
is
in
the
PO
position.
The
ALC
(automatic
level
control)
voltage
is
obtained
by
D2
and
D3,
181555
and
controls
the
gain
of
the
IF
amplifier.
[iovy
FUSE
FUSE
HOLDER
HOLDER
FUSE
FUSE
FUSE
HOLDER HOLDER
HOLDER
POWER
TRANSFORMER
CONNECTIONS
Q6
2SKI9GR
PB-
1534
I
(11)
METERING
The
meter
circuit
is
designed
to
indicate
signal
strength
in
the
receive
mode.
On
transmit,
the
meter
may
be
switch
selected
to
indicate
cathode
current,
relative
Power
Output,
and
automatic
level
control.
The
meter
functions
are
automatically
switched
by
means
of
relay
contacts
for
transmit
and
receive.
modes.
ALC
meter
reading
is
obtained
from
the
source
voltage
of
Q6,
2SK19GR
which
varies
in
ac-
cordance
with
the
ALC
voltage
derived
from
the
final
amplifier
grid
circuit.
For
the
EE
and
EX
models,
the
meter
reads
the
variation
of
the
source
voltage
of
Oh
2SK19GR
in
the
modulator
unit.
In
the
IC
position,
the
meter
is
connected
to
the
cathodes
of
final
tubes
in
parallel
with
shunt
resistor
R12,
‘and
measures
total
cathode
current
of
the
tubes.
In
the
PO
position,
the
relative
power
output
is
indicated
by
the
rectified
DC
current
at
the
pi
output
circuit.
The
meter
sensitivity
is
adjusted
by
potentiometer
VR6
located
on
the
rear
panel.
When
the
transceiver
is
in
the
receive
mode,
the
AGC
voltage
developed
by
the
signal
is
fed
to
the
meter
amplifiers
Q4
and
Q5
to
provide
a
meter
deflection
proportional
‘to
input
signal
strength.
The
meter
is
calibrated
in
the
customary
“S”
units.
A
meter
indi-
cation
of
S-9
represents
approximately
50
microvolts
at
the
antenna
terminals.
V,6JS6C
V;6JS6C
-
c23
L8
vel
C28
L31
317
J
vez
am
20),
7
D,
1!S1007

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