Yaesu FT-101EE - Page 15

(3) LOW FREQUENCY IF UNIT ( PB1183B)
e " a F, q “ ree
Chis: module contains ow frequency JI
crystal filter, detector VOCS meter cirenuits
a S180 KHz sienal from the nose blanket
fed ta the gate of G1 ZSKIGGR, FET from pn
‘ i
the module
Cin. recerve.
Circuits
| ror if
crystal
CW
whieh select the
The
‘ F F eae. = 1 |
man optional feature available
D1-D4 are dink
hitter fer SSB oar
filter XP SO
from your
SWoILCAes
CW recepticn G00) Hz
at additvenal
ewiteh Selects. t
when the MODE
Cost flealer Phe ‘diode
CW filter automatically
Lo VY pexsitier.
14
SWittn 18 set
This eontral voltage is cerivecd from
nin D and 12. The signal from the crystal filter is fed
Q2. SSC TE4IK and is amplified by Q?
and Q3, TA-70445M integrated circuit. The gain of
these
two
stages
is
controlled
automatically
by
the
AGC voltage derived from AGC amplifier Q4,
2$C828Q. The gain is also controlled manually by
the RF gain control on the front panel.
to the base of
The output fram GS is fed throweh T1109 to the ring
CW Phe
fed ta the The
THAT
demodulator DH:D)1 for and SSE reception
carrier Signal 1§ detector from pin 3
VR to
ft Tete!
ms balanced by obtain
Bar
al Sic
may be influenced by
carrier signal
which
The
reading
co ayer
the
distortion and
carrier oscillator sernal
PB-1183
VR
-2,
switch, ‘The
ame
aa |
t
|
= REQUENCY (tHe)
CHARACTERISTICS OF SSBICW FILTERS
OT, TST
1M
= 1 em Lace [25 wach
the audin amphher stage
fed to
throveh the MODE
connected to
sinal is fetected by eine
from pin 4
detected audio signals are
(AM) and
MODE switeh on the fret
auc ampitier wt from
(sob & CW)
and the pre ampliiet
nin 4 pin 6
throweh the
pare!
Do. ISIO07, D6, FS1555 AA
AC amplifier Q4. The emitter of Q4 controls S-meter
amplifier Q5, ZSC&24Q)
rectiers drive. the
Cn
leven [tis then amplified and passed through
transmit, signal is applied to the gate of Qi
nin bh,
the crystal filter. The output from the erystal filter 1s
applied ta the high frequency IF unit from pin LO.
Ga a Li o
ry ; Ss -
5
*) Pare _
ts ae * ic T r SOURCE
4 be
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=
' | 4
Ae?
= + Fiche a
al ashes
=o 5 =
oe oh
CW FILTER INSTALLATION DIAGRAM