Yaesu FT-101E Instruction Manual page 20
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Also See for FT-101E:
- Instruction manual (42 pages) ,
- Manual (234 pages) ,
- Operating manual (72 pages)
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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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