Power Regulator - Yaesu FT-101E Instruction Manual

whether Q3. 2SC3/2Y or @5, 25C372Y is selected
by the MODE switch. The MODE switch disconnects
the emitter circuit of either transistor when not in use
The output from the osctliator ts fed to the buffer
amplifier Q4, 2SCR828P, and then to the balanced ring
modulator D1—D4. The carrier suznal is also fed to the
ring demodulator from pin 6 for receive, These erysta
frequencies are matched to the bandpass of the crystal
filter to place the carrier frequency approximately 25
db down on the skirt of the filter response.
For AM and CW operation, the 179.3 KHz crystal con
lator Oi, 2SCa/27
the carrier signal, and QS and Q5 are disconnected
trolled ose operates to produce
for AM
OPeralhon,
Qf. Zsca7T2yY
operation and as a4
operates as a modulates
buffer stage for CW
The speech signal 1s fed to the balanced ring modulator
and -AM maeadulater Q2 from pin
Carrier balance is obtamed by a potentiometer VRI
and a trimmer capacitor, TC] Double-sideband,
suppressecd-carnier output from the balanced modulator
is amplified through T110 by the FP amplifter Q1.MK-10
D, and fed to the low frequency [F unit from pin fz,
For AM and CW. the output sienal from G2 is fed to
the high frequency [F unit. through CARRIER poten-
tiometer VR2 on the front panel
Si '
PB-1314
(6) POWER REGULATOR UNIT (PB1314A)
stable 6 volt DC supply wich is then fed to the
yarious circuits from pin 13. The regulated voltage
is supplied to the CLARIFIER control to offset the
receive frequency +23KHz etther side of the trans
mitted signal, VR4 permits adjustment of controls to
the receive and transmit frequency to coimecide at the
CLARIFIER zero or OFF position. A-LOO volt negative
voltage 1s: delivered from pin & to the unit. VRe sets
the operating bias at approximately—S0 volts for the
final amplifier tubes, This bras voltage is -60 volts
on receive and supplies the grid circuit of the final
tubes on the main chassis from pin 2. The bias for
the driver tube 12BY7A 1 also supphed from pin 4.
This: voltage is—20) volts on receive -and—3.5 volts
for transmit
This module alse contains the lOO -KHz/25 KHe marker
PRC TSSY
ascillates at the 100 KHz erystal frequency for dial
generator. Crystal controlled oseulater GT,
calibration. Trimmer capacitor, TC] 15 used to calibrate
100) KHz against WW or JY. Output from the oseil
ator is fed ints 2SKHe tmultivibrator O22, MFC
"O20 whieh fenerates & marker signal every oR He.
The multivibrater operates when the supply voltage
is applied through pin 17 from the switch on the
front panel. The calibrator output is fed through
the buffer amplifier Q3. 23C735Y to the receiver
antenna circuit trom pin 14.
VFO UNIT