Yaesu FT-101E User manual

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GENERAL DESCRIPTION
The model FT-IO1E/277E SSB Transceiver is a precision
built, compact high performance transceiver of advanced
design providing SSB (USB, LSB selectable) CW and
AML modes of operation. The transceiver operates at an
input of 260 watts SSB, 180 watts CW and &0 watts
AM on all bands 160 to 10 meters
All circuits, except the transmitter driver and linear
amplifier, are transistorized and composed of standard
computer type plug-in modules, permiting easy main
tenance
The transeever 1. self-contained, requiring only an. an
lenna and an AC. mains for home, portable or mobile oper-
ation. The transeener may be operated from TOOTTO:
117 /200/220/234 volts AC when appropriately wired
but 18 normally supplied for 117 volt AC and 12 volt
DC operation, The twoway solid state power supply
is an integral part of the umt. Two power cords. are
provided with the transceiver; Selection of AC or DC
power source 1s automatically made when the proper
line cord plug is inserted.
For mobile operation a separate switch is provided on
the
front
panel
to
turn
off
the
tube
heaters
while
in
the receive mode, In this mode the transceiver clraws only
0.5 amp. less than your auto dash lights
All accessories, such as VOX, break-in CW with side
tone, 25 and 100 KHz calibrators, noe blanker, 10
MHz WW are built-in. In addition , dual VFO adaptor,
erystal control adaptor, speaker and clarifier are
integral parts of the unit. Provision is made for the
installation of 600 Hz ervstal filter for the expert CW
DA operator, The CW filter is selected automatically
when the transceiver mode switch 1 placed in the CW
position,
The entire transceiver weighs approximately 40 pounds,
is 13 1/2" wide, 6" high, 11 1/2" deep. Construction
if of heavydauge steel which provides an extremely
rugged package, virtually immune to the effects of
vibration and shock
The SP 101PB/277PB combination phone patch and ex:
ternal speaker. is a valuable optional accessory for base
operation, [Che unit features an elliptical type speaker
for high quality voice reproduction. Other optional
equipment includes the FPV-LOLB/2Z776 external VFO
and mobile mounting brackets.
| —

SPECIFICATIONS
FereQuency: (RANGE: ccc -ceieeots ecentecevadsyateed stapes iabederea teat in mashes 1.8~29.9 MHz amateur bands, (160 thru 10m)
26.9~ 27.5MHz,
10~10.5MHz Receive only
Type Of Emission’ ves ces.ccesescesootee Soa dcesesdevecescdedechetveceveccesduses USB or LSB (selectable)
CW, AM
Pee Hatake ennces nscttctew-tatettcones anoeneines: ‘SSB 260 Watts PEP
CW 180 Watts 50% duty cycle
AM 80 Watts
(slightly lower on 10 meters)
Carrier SUpPPreSSiON ........ccccccccccccceessssssessteceeecesceseseeeeeeeeeeaes 50 db
Sideband Suppression .....cccccccsccescecessceeeeeseseeseceeeseeeeeeenaes 50 db at 1000 Hz
Sptirious Radiation scces.cieteahs cee bed site dad ead ated ches eee Down 40 db or more
Transmitter Frequency > Response ..........::cccsssscesseeseeeseeeeeeees 300 Hz - 2700 Hz +3 db
Distortion: Products ‘siscccpesicsssccsecescsesdesecattusteaeaisceceacarcseessbaees Down 30 db or more
Antenna Output Impedance ..........ccceeeesseeeceeseeeeesseeeeseeeees 50 - 75 ohm unbalanced
Frequency Stability ....... cee eeeseceeeseeseecrecsessesseereeesecseenees Less than 100 Hz drift in any 30 minute period
SOnSitiVit ys bscbncatecesdedelensiebcdvcobedsSushielabehonssousteresctaseaticeotsloie cd 0.3 uV S/N 10 db
SOLE CEVILY: ceive s aN oSE EA toa haat Sake eda ost ieee ene 2.4 KHz at 6 db)
eS
4.0
KHz
at
60
db)
SSB,
AM,
CW
(
(
(600
Hz
at
6
db)
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Audio:
Output
ne.tipedlininna
anise
catnsehoneeae
3
Watts
Power Consumption .........::ccccccccsceessssssessssenseeeeeceessessteeeeees AC Receive 45 Watts
Transmit 350 Watts Max.
DC 12V Standby 0.6 Amp.
Transmit 21 Amps. Max.
DIMONSiIOWS.
cts
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aeedie
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ode
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Seidaadaanuts
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13
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6”
high,
11
1/2”
deep
WO
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Pounds
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INSTALLATION
The transceiver is designed to provide a complete
single unit installation for fixed, portable, or mobile
operation. Two prewired plugs are furnished with
the unit for AC or DC operation. This system
provides the flexibility required for various installa-
tions and allows rapid change from fixed to mobile
operation.
Base Station Installation ;
The
transceiver
is
designed
for
use
in
many
areas
of
the
world
using
supply
voltages
that
may
differ
from
the
operators
local
supply
voltage.
Therefore,
before
connecting
the
AC
cord
to
the
power
outlet,
be
sure
that
the
voltage
marked
on
the
rear
of
the
transceiver
agrees
with
the
local
AC
supply
voltage.
CAUTION
Permanent damage will result if improper
AC supply voltage is applied to the trans-
ceiver.
The transceiver should be connected to a good ground.
The ground lead should be connected to the terminal
marked GND located on the rear panel of the trans-
ceiver.
Mobile Installation ;
The transceiver will operate satisfactorily from any 12
volt negative-ground battery source by connecting
the DC power cord to the rear panel receptacle.
For
under-dash
mounting,
a
special
mounting
bracket
is available from your dealer. A location should be
selected
clear
of
heater
ducts.
No
special
mounting
pre-
cautions need be observed if adequate ventilation space
is available. A minimum of two inches of air space
above the cabinet top and on all sides is recommended
to allow proper air flow around the cabinet. Never
stack other units above or below the cabinet since the
accumulated heat from both units could cause perma-
nent damage.
The transceiver requires an average of 14 amps on
transmit and 20 amps on voice peaks. The fuse in the
DC power cable should be rated at 20 amps. When
making connections to the car battery, be certain that
the RED lead is connected to the positive (+) terminal
and the BLACK lead to the negative (—) terminal of
the battery. Reversed connections could permanently
damage the transceiver. The BLACK lead should run
directly to the negative terminal of the battery. Using
the car frame as a negative connection or connecting
the positive lead at a point such as the ignition switch
places the devices creating noise in the same current
path as the transceiver and fails to take advantage
of the filtering action of the battery. The power cable
should be kept away from ignition wires and be as
short as possible to minimize voltage drop and to
provide a low impedance path from the transceiver to
the battery.
Prior to operating the transceiver in a mobile installa-
tion, the voltage regulator setting should be checked.
In many vehicles, the voltage regulations is very poor
and in some cases, the regulator may be adjusted for
an excessively high charging voltage. As the battery
and regulator age. the maximum voltage while charg-
ing can increase to a very high level which is in-
jurious to the battery and could cause damage to the
transceiver.
The transceiver is designed to operate from a source
voltage range of 11 to 14 -volts. It is necessary to
carefully set the regulator so that the highest charg-
ing voltage does not exceed 14 volts. The transceiver
should be switched “OFF” when vehicle is. started
to prevent voltage transcients from damaging power
supply transistors.
Antenna ;
CAUTION
Never transmit without having proper
antenna or dummy load connected to
the transceiver
The transceiver is designed for use with resonant anten-
na having an impedance 50-75 ohm resistive load.
The antenna is usually the most critical part of a
station installation. Results both in receiving and trans-
mitting will depend on how well the antenna is installed
and adjusted. Any of the common antenna systems
designed for use on the high frequency amateur bands
may be used with the transceiver, provided the input
impedance of the antenna system is within the capa-
bility of the transceiver pi-matching network (50-75
ohms).
es ee

If a tuned open wire transmission line, or a long wire
antenna is used, a suitable antenna tuner must be used
between the antenna and the transceiver to provide an
impedance match between the unbalanced coaxial out-
put of the transceiver and the balanced open-wire feeder
or Jong wire.
For mobile operation, most of the commercially availa-
ble antennas on the market will give good results with
coaxial cable is securely grounded to the chassis of
the vehicle at the antenna mount. Adjust the antenna
length carefully for minimum SWR after installation.
INTERCONNECTIONS
FV-101B/277B FT101E/277E
GND
1 O
°
SP-101PB/277PB
ANTENNA
TELEPHONE
LINE
INTERCONNECTION DIAGRAM
MIC PLUG
@ @
Q @
MICROPHONE CONNECTION
WARNING
SERIOUS DAMAGE MAY RESULT TO THE INVERTER TRANSISTORS IF POWER PLUG OTHER
THAN THOSE SUPPLIED WITH THE UNIT ARE UTILIZED.
CINCH JONES OR OTHER SIMILAR U.S.A. VERSION CONNECTORS WILL FIT, HOWEVER THE
PIN NUMBERING SYSTEM IS DIFFERENT.

FTV-250/FTV-650B
(2/6 METER TRANSVERTER)
FT101/201
FTV-650B
(NPUT
POWER 2
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CONTROLS AND SWITCHES
The
transceiver
has
been
specifically
designed
for
ease
of
operation
and
versatility,
All
controls
have
been
preset
at
the
factory.
Several
of
the
controls
are
unusual
in
operation,
and
improper
adjustment
may
result in signals of poor quality, The various from
(1) VFO Select Switch :
This switch provides selection of the companion FV-101B
external VFO or two fixed crystal oscillator positions
Normal operation of the transceiver VFO requires that
the switch be placed in the “INT” pasition,
IN T-- FT-101E/277E VFO controls both trans-
mitter and receiver frequencies
RX EXT-FV-101B/277B EXTERNAL VFO controls the
receiver frequency and the FT-101E/277E
VFO controls transmitter output frequency.
TX EXT--FY-101B/277B. EXTERNAL VFO controls the
transmitter
output
frequency
and
the
FT-101E/
277EVFO controls the receiver frequency.
EXT: FY-LOIB/277B EXTERNAL VFO controls
both transmitter and recerver frequencies.
CHI, CH2--Provides crystal control of the transceiver,
Proper ervstals must be installed on PB-1494
crystal oscillator board, for ervstal controlled
operation
(2)
MODE
Switch;
(LSB-USB-TUNE-CW-AM)
The MODE switch is a five-position switch. This
switch is used to select the mode of operation;
LSB, USB, AM, CW, or TUNE position, In the
AM,
CW
and
TUNE
position,
a
separate
crystal
is
used to shift the carrier frequency into the filter
passband,
(3) RF GATIN/AF GAIN ;
The RF GAIN and AF GAIN controls are mounted
panel controls and ther functions are described in the
following section. Be ‘certain that you understand
thoroughly the function of each control before operating
the transceiver,
an concentric shafts. RF GAIN control (lever control}
varies the gam of the receiver RF and IF amplifier.
Maximum sensitivity is obtained with the econtral set
at 10} { fully clackwise),
The AP GAIN control (round knobij adiusts the audio
output level at the speaker and phone jack. Clockwise
rotation increases the audia outpul.
(4) Tuning Knob
The
tuning
knob
located
directly
below
the
main
dial
window
in
combination
with
the
band
switch
determines
the
actual
frequency
of
operation,
The VFO drive mechanism consists of a precision
spring loaded spht gear system in combination with
a planetary drive unit to provide zero backlash at low
tuning rates, Each revolution of the tuning knob results
ina frequency change of 16 KHz as indicated on the
skirt surrounding the tuning knab,
(9) BAND Switch ;
The band switch is an eleven-position switch used to
select the desired band for receiving or transmitting.
The band indication is color coded to guide
tor selecting inthe proper frequency scale for each band.
(6) (7) CLARIFIER ;
The clarifier control provides a means for tuning
the receiver trequency 3 KHz to either side of
the transmitting trequency. Thus, it is possible to
set the pitch of the voice you are receiving to the
the opera-
SSE

most readable point without affecting your trans-
mitting frequency. Its use is particularly valuable
in “net”? operation where several participants may
be transmitting slightly off frequency. The clari-
fier control functions with the clarifier switch (7)
set to the push-down position, and a red warning
lamp lights up. With the clarifier switch out
position, the red lamp turns off and the receiver
is locked to the transmitting frequency.
Normally, you will want to keep the clarifier in
the OFF position until the initial contact is made.
The clarifier control may then be used to zero-in
and correct the any drift on the received signal.
(8) PRESELECT ;
This control pretunes the signal circuits for both
transmit and receive. The preselect circuit pro-
vides continuous permiability tuning throughout
the frequency range of the transceiver.
(9) MIC GAIN/CARRIER ;
The MIC GAIN/CARRIER controls are mounted
on concentric shafts. The carrier control (lever
control) varies the amount of the carrier in the
CW, AM and TUNE modes of operation.
The MIC GAIN control (round knob) varies the
audio level from the microphone amplifier stage.
The control has sufficient range to permit the use
of any high impedance crystal or dynamic micro-
phone. Both, controls have maximum gain with
the control set at 10 (fully clockwise).
(10) PLATE;
Tunes plate circuit of the final amplifier.
(11) LOADING ;
Tunes the output circuit of the pi network to
match antenna and feed line impedance.
(12) LEVEL
This controls the output level of the RF processor
with the RF processor on.
(A) POWER
Main switch turns transceiver ““ON”’’ for both AC
and DC operation.
(B) HEATER
With
transmitter
this switch in the down position, the
tube off. This
reduces battery drain to 0.5 amp and_ thus
heaters are turned
permits long periods of listening without exces-
sive battery drain. Pushing the rocker switch to
the upper position provides supply voltage to the
tube heaters. After a 30 second warm-up, the
transmitter is ready for operation. This switch
operates in both DC and AC modes.
~)
(C) MOX-PTT-VOX
This slide switch selects desired transmitter mode
for both microphone and key operation.
MOX-(Manual transmit switch position)
Locks transmitter ‘““ON’’ and must be returned
to PTT position for receiver recovery.
PTT-(Push-to-talk)
Locks
switch is depressed. Receiver recovers auto-
transmitter ‘ON’ when microphone
matically when microphone switch is released.
VOX-(Voice operated transmit or break-in CW
operation)
This switch position allows the operator to
actuate the transmitter by simply speaking
into the microphone. Receiver recovers auto-
matically when the operator stops speaking.
For break-in CW, the VOX system will actuate
the transmitter each time the key is depressed,
and receiver recovers each time key is released.
(D) PROCESS
RF speech processor is placed into the circuit to
increase the modulation power with this switch
ON position.
(E) NB (NOISE BLANKER)
In upper position, the noise blanker is placed in
the circuit and eliminates noise pulses caused by
auto ignition.
(F) RF ATT (RF Attenuator)
This switch provides insertion of a 20 db attenu-
ator in the incoming signal path to minimize
cross modulation which may be caused by ex-
tremely strong local signals.
(G) 25 KHz/100 KHz (CALIBRATOR)
The 100 KHz crystal oscillator is used to cali-
brate the receiver. In the 25 KHz position, the 25
KHz multivibrator generates a marker signal at
each 25 KHz point on the dial. Clarifier control
must be in the “OFF” position when setting
calibration.
(H) PHONES
Headphone may be inserted in this jack for
private listening. The internal speaker is dis-
connected when the headphone plug is inserted.
Any high quality head phone may be used.
(1) MIC
Microphone Jack. Four pin connector is used for
microphone input, and push to talk relay actua-
tion.
(J) METER
Selects the meter mode to read PA cathode
current (I.C.), relative power output (PO), or
ALC feedback voltage.

REAR APRON CONNECTIONS AND CONTROL
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| 1
ia) AF-IN ; !
Audio input jack tor auxiliary station equipment,
An FM detector unit, or a high level microphone,
may be applied at this point for audio output
from the transceiver speaker.
(b} [IF OUT :
3180 KHz IF signal is available from this jack for
use with other station equipment such as pano-
ramic adapter, etc.
tel SPs
Audio output is’ provided at this jack for an
external speaker. Output impedance is 4 ohms
and the internal speaker will be disabled when
plug is inserted.
(d) PIT;
This jack may be used for external ‘actuation of
the transmitter. As an example, a foot switch
may be inserted into this jack to provide remote
control of the transmitter PTT relay.
le) PATCH ;
Speech input terminal for phone patch connec-
clon. Impedance is 50 K ohms.
(f) RECs
This jack is connected to the receiver output (4
ohms) to be used for phone patch or other use.
(g) TONE ;
Sidetone output for additional receiver if used.
(h) A-TRIP;
Anti-trip input from additional receiver if used.
(i) FAN;
Power outlet for cooling fan.
(j) P.O, ADJUSTMENT;
Meter sensitivity adjustment tor relative power
output indication.
oe ar
(kK) RF OUT:
Signal frequency output from the driver stage may
be obtained at this jack for use, of optional equip-
ment, such as the FTV-650B and FTV-250 6 and 2
meter transverters.
(l) GND;
Ground connection.
fm} LAMP FUSE ;
This lamp fuse protects the RF amplitier tran-
sistor from damage which may be caused by
extremely strong local signal.
in} ROY ANT;
Other receiver can be used through this Jack.
to) ANT ;
Coaxial connection for antenna.
(p) ACC ;
Accessory socket. ‘Provides access to transceiver
operating voltages and relay contacts at this
outlet.
\q) KEY;
Key jack for code operation.
(r) EXT VFO.
Connections for external VFO.
(8) .FUSE::
Fuse holder requires 5 amp fuse for 117 volt or 3
amp fuse for 220 volt operation, D.C, power cord
fuse 20 amp.
it) POWER :
Power receptacle. Both AC and DC cables are
supplied,

OPERATION
The
tuning
procedure
of
the
transceiver
is
not
complicated,
however,
care
should
be
exercised
when tuning to insure peak performance of the equip-
ment. The following paragraphs describe the procedure
for receiver and transmitter tuning.
INITIAL CHECK
Before connecting the transceiver to a power source,
carefully examine the unit for any visible damage. Check
that all modules and crystals are firmly in place and
that controls and switches are operating normally. En-
sure that voltage specification marked on rear panel
matches the supply voltage.
FREQUENCY SELECTION
The main tuning dial is color coded with the band
selector switch for proper frequency read out. When
band selected is marked in Red, the operator reads the
Red numbers on the main tuning dial. When for
example the band selected is marked in White on trans-
ceiver front panel, the operator reads the Black numbers
on main tuning dial.
The main tuning dial is marked in 25 KHz increments
between each 100 KHz segment. This provides a
course frequency setting within the band. The dial skirt
surrounding the tuning knob is marked in 1 KHz in-
crements and provides for fine settings of the trans-
ceiver operating frequency.
Following the example shown, familiarize yourself with
the relationship of main and skirt dial frequency read-
out.
00 |
RECEIVER CALIBRATION ;
Preset
the
controls
and
switches
as
indicated
:
VFO Selector ......cc eee INT (internal)
MOX-PTT-VOX uo. PET
POW ER ee iiesstcecietaviea: ON (upper position )
RF GAIN wecceeeceeeeeeee Maximum
AF GAIN wccccceeeesseees As required
BAND i.e... st thier Desired band
MODE vi iiaicises acecsstdecas Desired mode
TUNING wissicctistertetes ten 100 KHz point
PRESELECTOR |... Desired band segment
CLARIFIER wo. OFF
RE CATED .c.02-eee heed OFF
CALIBRATOR wu. 100 KHz
To calibrate, set the TUNING control to the 100 KHz
point on the dial nearest the desired frequency. Tune
the preselector for maximum “S” meter deflection. Tune
the transceiyer to the 100 KHz calibrator signal for
zero beat. Two signals may be heard near the 100
KHz point. One of these is a signal feeding through
the IF stages. Always calibrate to the stronger of
these two signals. To calibrate, hold tuning knob firmly
at zero beat point and rotate skirt vernier dial to
zero position. The skirt vernier dial surrounds the
tuning knob and is held in position by a friction
locking device. This dial is easily movable by hand
but will retain its position after calibration. The trans-
ceiver must be calibrated when changing mode of opera-
tion of LSB, USB, AM or CW,
Switch the calibrator to the 25 KHz position and note
that the calibrator signal can be heard at every 25
KHz point. The calibrator switch should be in the
OFF position in normal use of the transceiver.
For bands 40-20-15-10A-10C read Black scale on main
oY dial. Setting shown in the example would then be 148
KHz plus the starting band edge frequency in MHz.
For example, on 40 meters the frequency would be
7.148 MHz. On 20 meters, 14.148 MHz, etc.
For bands 160-80-10B-10D read Red scale on main dial.
Settings shown in the example would then read 648 KHz
For example, on 80 meters the frequency would be 3.648
MHz, on 10B, 28.648 MHz, etc.

TRANSMITTER TUNE-UP
The following tune-up procedure must be performed
prior to selection of desired operating mode, LSB, USB,
CW, or AM. See paragraphs relating to the specific
mode after basic transmitter tune-up.
Connect dummy load or matched antenna to the coax-
ial fitting on rear apron, and preset controls as follows :
POWER oo cecseccesseceseeeeees OFF
HEATER 0... ccccceceeseeees ON
MODE. hsatticeieteecat TUNE
CARRIER uu... eee 0 (fully counter-clockwise )
BAND uu. ceeeceeeesesesceseneoees Desired band
TUNING oo. eecceee eee Desired frequency
PRESELECTOR ............... Desired band segment
PLATE sj sbivcccreeitichiceseleces Desired band segment
LOADING uu. eeeeeeeeee To position shown in table
ME PER eieitecteccivieoraetedss IC
VFO SELECT ......0.000. INT
MOX-PTT-VOX ...... cece PTT
LOADING POSITIONS
BAND LOADING
160) 2. lee Sh 5
NOTE : Loading positfgns are nominal. Slight variations
from ek ae are to be expected.
With the transceiver turned on, allow 60 seconds for
warm-up of the transmitter tubes. Be certain — that
accessory plug is in the accessory socket. The heater
voltage to the final tubes is supplied through pins 1
and 2 of the accessory plug.
Set the” MOX-PTT-VOX ” switch to MOX position. Meter
will now read Final Amplifier resting cathode current.
This should be set at 6Q mA with the BIAS control
located under the top cover near the rear of the set.
Switch the meter to ALC position and adjust ALC
control under the top cover for full scale deflection
of the meter. Return meter switch to IC position and
“MOX-PTT-VOX" switch to PTT position.
PRE-TUNING
1. Adjust “PRESELECT” for maximum receiver noise
level.
2. Place “MOX-PTT-VOX” switch “MOX”’ position.
3. Rotate “CARRIER” control arm until meter rises
just above normal idling current. ( 60 mA)
4. Adjust “PRESELECT” for maximum meter reading.
(Caution: if meter exceeds .1 (100 mA), reduce
“ CARRIER”)
5. Rotate “PLATE” control for minimum meter reading.
(Plate Dip)
6. Return “MOX-PTT-VOX” switch to PTT position.
The transmitter is now pretuned to the desired frequency.
Final peak tuning is accomplished by carefully following
the final tuning procedure.
FINAL TUNING
Final peak tuning utilizes the meter relative power
output position (P.O.). At full transmit power the meter
will read approximately one-half to two-thirds full scale
into a matched antenna load. If during final tune-up
it is noted that the meter indication exceeds full scale,
discontinue tune-up. Off scale meter indications are the
result of reflected RF due to high VSWR and correc-
tive action should be taken before attempting final tune-
up.
CAUTION
Exceeding the time limits noted during
final tuning may result in destruction of
final output tubes.
1. Set meter switch to P.O. position, rotate “ CARRIER "
control arm fully clockwise to position 10.
2. Momentarily set “ MOX-PTT-VOX ” switch to “ MOX"
(10 second maximum), and rotate “ PRESELECT”
control
for
maximum
meter
reading.
Return
“
MOX”
to
PTT
position.
aw
(10
second
maximum)
and
increase
or
decrease
“LOADING”
control
for
maximum
meter
reading.
Return
“MOX”
to
PTT.
position.
4.
Momentarily
set
“
MOX-PTT-VOX
™
switch
to
“
MOX
”
(10
second
maximum)
and
increase
or
decrease
“PLATE”
control
for
maximum
meter
reading.
Re-
turn
“MOX”
to
PTT
position.
.
Repeat
steps
3
and
4
until
maximum
meter
reading
wn
is obtained.
The transmitter is now tuned for maximum output.
Return “CARRIER” control arm fully counter-clock-
wise to zero position. Return meter switch to IC posi-
tion and MODE switch to desired operating mode.
NOTE: Moving the *“MOX-PTT-VOX” switch to the
“MOX” position in the above steps may be
eliminated by simply operating the microphone
PTT switch when microphone is attached to
the transceiver.
aN
.
Momentarily
set
“
MOX-PTT-VOX”
switch
to
“
MOX"
RT ee OL Se ee SETS

SSB OPERATION
After completion of tuning, set MODE switch to LSB
or USB. Set the METER switch to ALC position. Set
the ° MOX-PTT-VOX™ switch to the PTT position and
advance the MIC GAIN control until the meter kicks
down
to
midscale
of
green
colored
portion
when
speaking
normally into the microphone.
Set the “MOX-PTT-VOX” switch to VOX position.
For VOX operation, adjust VOX GAIN potentiometer
under the top cover until voice actuates the trans-
ceiver. Set the ANTITRIP potentiometer to the mini-
mum point to prevent the speaker output from tripping
the VOX. Do not use more VOX gain or ANTITRIP
gain than necessary. Adjust the DELAY potentiometer
under the top cover for suitable release time.
NOTE: When meter is set to IC, voice modulation
peaks will indicate 150-200 mA. Actual peak
current, however, IS approximately 2 times
the indicated value.
CAUTION
CARE
must
be
taken
to
avoid
an
excessive
drive
to
prevent
spurious
radiation.
Maximum
key
down
current
should
be
kept
within
330
mA
for
the
bands
under
15
meter
and
280
mA
for 10 meter band.
VOICE
OPERATION
WITH
RF
PROCESSOR
The
FT-101E
Speech
Processor,
when
properly
adjusted,
is
designed
to
improve
the
intelligibility
threshold
at
the
receiving
end
with
RF
clipping.
This
highly
clipped
IF
signal
is
filtered
to
remove
RE
harmonics
and
out
of
band
intermodulation
products.
The
distortion
produced
by
RF
envelope
clipping
and
filtering
is
less
objectionable
than
that
caused
by
an
equivalent
amount
of
audio
clipping.
It
should
be
noted
that
the
RF
Speech
Processor
does not increase maximum power output but
clipps maximum peak to increase the output of
low
level
signal
as
illustrated
in
Fig.
2,
and
the
improvement
of
an
RF
Speech
Processed
Signal
is
most
noticeable
when
the
SSB
signal
is
weak
at
a
distant
receiver.
With the PROCESS switch OFF, set the METER
switch to ALC position. Normally speaking into
the microphone, set the MIC GAIN control to the
level where the meter indication stays in green
portion of the meter scale. Set the PROCESS
switch ON and adjust the LEVEL (processor
output level) control to the position where the
ALC indication stays in the green portion.
Optimum setting of the MIC GAIN and LEVEL
controls may need observation of the transmitted
signal by the scope.
Vw
Worn/
Ne"
Fig. | Fig.2
Fig. 1 RF Processor OFF Fig. 2 RF Processor ON
CW OPERATION
Upon completion final tuning, insert key plug in jack
marked
“KEY”
on
rear
apron
of
the
transceiver.
Power
output
from
the
transmitter
is
determined
by
the
“CARRIER” control arm position. The operator may
select
any
power
output
desired
by
simply
rotating
the
“CARRIER”
control
within
the
limits
of
its
range
from
zero
to
ten.
The transceiver may be operated manually or break-in
by setting the “MOX-PTT-VOX" switch to either MOX
(manual) or VOX (break-in) for the desired mode of
operation.
NOTE: Insertion of the key plug automatically dis-
connects the bias supply to the PA tubes,
therefore. with the key plug inserted Final
Amplifier bias current will not be indicated
when meter is in the IC position.
AM OPERATION
AM operation of the transceiver is accomplished by
setting the MODE switch to the AM _ position and
inserting the proper amount of “CARRIER” with the
“CARRIER” control.
After completion basic transmitter tune-up, place the
MODE switch in the AM position and rotate * CARRIER ”
control arm until meter reads 15 (150 mA) in the IC
position. While speaking into the microphone normally,
increase: MIC GAIN until the meter indicates very
shght movement with voice peaks.
Care must be taken in adjusting MIC GAIN control
to assure that the “CARRIER” control arm is not
rotated causing an increase in “CARRIER” level. Do:
not exceed 15 (150 mA) meter indication during AM
operation or destruction of the Final Amplifier tubes
may result.
CAUTION
On the 160 meter band, maximum plate current
should be kept within 140mA to avoid spurious
radiation when it is operated on the frequen-
cies between 1820 KHz and 1900 KHz.

this transceiver.
CIRCUIT DESCRIPTION
The block diagram and the circuit description that follows will provide you with a better understanding of
AF UNIT
a 3B oF
mene micawe c.e, >
é
me =p [ESET pC [SEE
04 6
VOX AMP RL CONT
SSB OET
~ fisioo7x4
if
i
i
i
Pep
SIBISKHz
Lae.
eee eee)
Hz
<=
cw
| RF UNIT
aaa 5 98
| TRANS 2nd MX
' 1s
é |
i . 2
t REC 2nd MIX |5520~ 6020KHe REC ist MIX
1oO-~43sKka0}. [BFF | I. dg. [25*18
i + ae
AY SSS s]
ty AGC t ho
ch ed, ed Pe ed P43 IRF AMP
or Qs
IF AMP NOISE AMP
pee oe eh
af
1
(Q5 LEVEL CONT Q6 IF AMP
lea
SNe GATE worse ave
rece eral
1
1Qs
ligamp. —— Noise ane}
i }o2 |
-4 [ees] [KE]
"96
gate
i
60 4k 7.820MHz
eo 40k seo
POWER SUPPLY
13.5v DC-DC CONV
———— TRANSMIT
—---—» RECEIVE
ONT.
pes)
NB UNIT
40 DF 13.020
20 ADF 20,020
15 40F , 27,020
tt 4QF 33.020
! 10a 4k 34.020
F 108 40F 34520
I voc 40t 35,020
oo 4OF 25,520
wivdlTk is.020
VFO UNIT
8700 ~ 9200KHz
TUBE & SEMICONDUCTOR COMPLEMENT
HF Unit PB-1181(A-Z)
Ql RF amplifier
Q2 Receiver 1st Mixer
Q3 Transmitter 2nd Mixer
~ Q4 Local oscillator
Q5 Buffer
3SK40M
2SK19GR
2SC784R
2SC372Y
28C373
HIGH FREQUENCY IF Unit PB-1180 (A-Z)
Qi Transmitter 1st Mixer
Q2 Receiver 2nd Mixer
28C3/2Y
3SK40M
LOW FREQUENCY IF Unit PB-1183 (A-Z)
Q1_ IF amplifier
Q2_ IF amplifier
Q3 IF amplifier
Q4 AGC amplifier
Q5 S$ meter
2SK19GR
2SC784R
TA7045M
2SC828Q
2SC828Q ©
MODULATOR Unit PB-1184 (A-Z)
Q1_ IF amplifier
Q2 AM modulator
Q3 USB oscillator
Q4 LSB oscillator
Q5. CW-AM oscillator
Q6 Buffer
AUDIO Unit PB-1315 (A-Z)
Q1 MIC amplifier
Q2 MIC amplifier
Q3 Emitter follower
Q4 VOX amplifier
Q5_ Relay control
Q6 Relay control
Q7 CW side tone osc.
2SK19Y
2SC372Y
2SC372Y
2SC828P
2SC372Y
2SC372Y
2SK19GR
2SC372Y
2SC372Y
TA7042M
2SK19Y
28C373
28C373
Q8 AF amplifier
Q9 Pre amplifier
VFO Unit PB-1056 (A-Z)
Q1 VFO oscillator
Q2 Buffer
Q3 Amplifier
NB Unit PB-1292 (A-Z)
Ql IF amplifier
Q2_ IF amplifier
Q3 Noise amplifier
Q4 Noise amplifier
Q5 Noise amplifier
Q6 NB gate control
PROCESS FIX Unit PB1534 (A-Z)
Qi Amplifier
Q2. Limiter Amplifier
Q3 Amplifier (Process ON)
Q4 Amplifier (Process OFF)
Q5 Level Control
Qé ALC Amplifier
Q7_ Crystal Oscillator
REGULATOR Unit PB-1314 (A-Z)
Q1. 100 kHz oscillator
Q2 Flip Flop
Q3 Marker amplifier
Q4 Regulator
MAIN CHASSIS
V1 Driver tube
V2, V3 Final amplifier
DC-DC convertor
QI, Q2
AN214
2SC1000GR
2SK19GR
2SK19GR
2SC372Y
2SC372Y
2SK19GR
2SK19GR
2SC784R
2SK19GR
2SC372Y
2SK19GR
TA7060P
2SK19GR
2SK19GR
2SC372Y
2SK19GR
2SK19GR
2SC735Y
MFC-6020
2SC735Y
MFC-6034A
12BY7A
6JS6Cx2
2N4280x2
'
|

The transceiver has adaptec computor type plueein
1 a |
wh
frequeney EF unit, OW frequency IF unit, Audio unit
modules; These modules are: High frequeney unit, |
Modulator unit, Nose blanker unit antl Power reeulatot
unit, In addition, the VFO unit, Crystal osertater unit
and Rectifier umit-are built-in to the main chassis.
(1) HF UNIT (PBI1éIB})
This module contains the receiver RF amplifier, receiver
lst mixer, transmitter 2nd mixer and heterodyne oscil
later cireun. The signal from the antenna coil is fed
ta the gate of Q1 (field effeet transistor SSK40™M)
through terminal & of the module
The AGC (automatic gain control) voltage which 15
obtained from the low frequency IF unit, is applied
to the gate circuit of @1 from pm -§ to control the
cain of this stage. A manual RF gain control on the
front panel ts connected to the source of Q1] through
pin 10,
Signal output from the @1 is then coupled te the
recenver first mixer G2. 2SKIGGR where the meoming
signal is mixed with a signal from the heterodyne
oscillator (yd, 2SCA72Y throweh the buffer stage Qs,
Z2ouero. Phe produet of the first mixer is app
ean set la
wd fram
the pin 17 to the high frequency IF unt.
Transmitter signal is fed to the base of transmitter 2nd
mixer Q3, 2SC7S84R from pin 13. The signal from the
heterodyne
oasciliter
is
appled
to
the
emitter
of
the
mixer Q3, thrauth the buffer stame Q4, 2SCa72Y. This
arrangement converts the hich frequeney [F signal to
the desired transmitting Trequeney. This transmitting
sitnal is fed ta THI through pin i. The gate circuit of
the receiver mixer G2 is disconnected in transmit by
dim switch to avoid the lowering the Q of the circuit,
Crystal sockets.and all coils are mounted on the main
CeLSSLa,
(2) HIGH FREQUENCY IF UNIT | PB1I80B)
The module contains the transmitter first mixer QI,
PSC37ZY, the receiver second mixer G2, SSRKAUM,
and 5520 to 6020) KHz bandpass network, The signal
from the receiver first mixer is fed to the gate of the
5 Q, Q, Q,
PB-1181
mixer through the bandpass netwark Ll, L2, and Ld,
fram pin 15, VFO voltage is also appliecdto the 2nd gate
at Q2 from pin 11. The signal is converte! ta 3180
KHz low frequency IF and fed to the following Stage
from pin 4 through an output transformer T1124. On
Eransmit, the SEA0 KHz sienal is fel to the base of
the mixer, from pin 6; A 14 MHz trap coil T113 ts
connected in the base circuit of QL. The VFO) signal
ss fed to the emitter af the Q1 whith preduces the
sare) to 6020) KHz high frequenevy IP signal, This
signal is fed to the following stage from pin l6 through
the bandpass network
T. Q, x. Te Ti;
PB-1180
*y
‘di
BANDPASS NETWORK CHARACTERISTICS
— 13-—

(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
¥ * » ¥
=
' | 4
Ae?
= + Fiche a
al ashes
=o 5 =
oe oh
CW FILTER INSTALLATION DIAGRAM

(4) AUDIO UNIT ( PBI315A4)
This module contains the microphone amplifier, receiver
audio amplifier, VOX amplifier and CW sidetane ascil
later. A speech signal from the microphone is fect to
the first MIC amplifier QL2SKI9GR FET from pin 3,
Input impedance of the MIC amplifier is 50 K ohms.
The signal, controlled in amplitude by the MIC GAIN
control between pin 3 and pin 4, 1% amplified by the
second microphone amplifier Qe, 25C372Y and applied
to the emitter follower QS, ZSCA72Y to be delivered
to the modulator unit fram pin &.
The receiver awdio signal from the AUDIO GAIN
contral is applied through pin 19 to 4 pre amplifier
Q9,25C1000, and amplified by integrated circuit Q8,
AN2I4. This stage, in turn, increases the signal to
speaker level. The audio power amplifier circuit
utilizes the OTL (output transformer less) circuit
and delivers 3 watts output to the speaker through
Dik 24.
The signal from the first microphone amplifier ts coupled
through the VOX GAIN control potentiometer VR1 to
VOX amplifier Q4, TAVO42M, The signal amplified
by G4 is fed to the VOX rectifier, The positive DC
output voltage of the rectifier is applicd to the gate
of the VOX relay control transistors G15, 2SK19¥
and Q6, 2SC373 causing them to conduct and actuate
the VOX relay RLT on the maim chassis. The collector
circuit of 6 is connected to. RLL through pin Is.
The ANTITRIP circuit provides a threshold voltage
to
prevent
the
speaker
Gutput
from
tripping
the
trans
ceiver into the transmit function. The receiver audio
VR. VR, Q, VR. VR, VR,
; fi é
q,— 6
ot
ay ?
0. ae ll }
e. ——-Q,
VRS to the antitrip amplifier 4, and fed to rectifiers
Dl and D2. 2S1555, Negatwe DC output voltage from
the recofier. connected to the gate of QS, reduces the
rain of the VOX -centrol transistor previdina the neces:
sary antitrip threshold, ANTITRIP control VES adjusts
the value of the antitrip voltage threshold so that the
loud Speaker output wil not produce excessive positive
DC output from the VOX. rectifier to exceed the neva
tive DC output from the antitrip rectifier and cause
the control transistor to actuate the relay, When speak
ing into the microphone normally the positive voltage
will exceed the negative antitrip voltage and actuate
the relay. VES pravides course adjustment for relay
sensitivity,
Relay hold time will be determined by DELAY control
VRa,
The tone oscillator GY, 2SC0'73 aperates when -the
MODE switch is in CW position, It is a phaseshift
oscillator operating at approximately 800 Hz. The tone
output is cativated by the keving cireuit and coupled
throuch SIDETONE LEVEL. control VR4 te the receiver
audio amphiier for sidetone monitoring 1m CW operation.
The output from Q7 is-also coupled ta the VOX amplifier
O4 for break-in CW eperabion
(5) MODULATOR UNIT (PBI184A)
The MODULATOR UNIT coantamns the carrier oscil:
lators; the ring modulator ¢circunt fer SSR. and AM
modulator. The carrier oscillator oscillates -‘enther 41¥38.5
KHz for USB or 31815 KHz for LSB, depending upon
TC, TC, Te, VR, a ce OE tin ¥R,
| | (‘e.ime
| | a
| —
! :. 2 r
{ | i, | Phi, 3
il ip 21a ek ee
2S See ee} F
| || |
‘CUO UE
COD UOOy
QQ, lw QQ,
PBI 184

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 ‘
EEE
PB-1314
(6) POWER REGULATOR UNIT (PB1314A)
The
DC
13.6
volts
from
the
rectifier
unit
is
supp
lied
through
pin
14
to
the
voltage
regulator
circutt
O4,
MFC
6034A
in
this
unit
to
obrain
extremely
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

VFO UNIT ( PB-10564
» VFO medule board is installed in the VIO chassis.
VFO uses FET 2SkK19GR ard
25K19GR first 2SCa72Y buffer
cvides isolation and amy VFO sighal:
transisters @1,
has
ation of
buffer,
tor
Lie
The VFO aseillation frequency is 8700 KHe to 9200
Kilz. and the tunable IF range of 500 KHz.
Dl, 18145 in series with
Cl4 is santehed imto the eireuit
COYErS
Varactor diode apacttor
ay the clarifier
and the relay contacts to shaft the VIO frequeney for
receiver
Ssaiteh
offset tuning,
PR-1292
FIX PROCESS UNIT
Cf Ta: TOROF
So oth 3 Fale ea Fe ff ny Taste
:
Ot)
tale
ce
ie
ae
Sass
c ie ol ae
Sta
! s= 3
se a
Laas
aS
pRacesah
on. ——
LE #hGeH
GL oy EN
ALE Mid = _ ——
THsT- Qo — =
be
ieee
———K————————
(&) NOISE BLANKER LKIT (PR1292)
S180 KRHs cutout
fect
abel Ea he sienal amplified
the IF amplifier Qs
ciode Dr.
the IF
LISS,
The
2nd mixer ts
PSS TAY
nv OQ? is. fed
2S TSR: throuch
signal from the recerwer
s hase of IF “amplifier @Q2.
threuch
ta the gate col
the noe blanker
IS1555.
and
then
amplified
by
Qa
ancl
bec
i
amplifier
chain
in
the
low
frequeney
IF
unit
PB
S180 KHz signal is also
OM,
7 eA
above fal to the ate of
noise a iy Wier
ancl GS. ZC
SSK 19GR and amplified through (4
a a
Pulse rectifier diode D4, 1Si555 conducts with the noise
pulses in the output from QS. and negative output voltage
25K 34E in
n the noise blanker driver Q7,
irom the diode 15 applied ta the gate of Qe,
order to turn off Q6.1]
PSC372Y conducts to switch a noise blanker diode D2,
which
disconnects
the
input
¢ireut
of
the
[FP
amplifer
QS whenever the noise pulse exists.
The
switching
level
is
adjusted
by
the
noise
blanker
WRI.
there tay
threshold control At the most effective blanking
Position,
3@
slicht
distortion
on
the
received
signal due to mixing at the switching diode. This effect
can
be
reduced
by
adjusting
the
t
comtral
slightly.
(9)
CRYSTAL
CONTROL/RF
PROCESSOR
UNIT
(PB-1534)
This
model
the
VFO
unit.
The
interconnection
of
the
modules
is
wired
directly
is located on
without using plug-in socket.
Q3 25KIR5R

E .
7 PROCESS
— out
fre? EF SO
LIER
| Fix OuT
TC. cu. CH, Te
CRYSTAL CONTROL
In
addition
to
normal
VFO
operation,
aCe
crystals
May
be
selected
for
crystal
controlled
operation
by
a
selector
switch
located
on
the
front
panel
ot
the
transceiver,
RE PROCESSOR {PB-1534)
The
SSB
signal
generated
through
the
crystal
filter
is
amplified
by
Q1,
2SK19GR
and
fed
co
either
of
Q2,
TA-7060,
or
O4,
2SKIIGR.
When
the
RF
processor
switch
is
OFF,
the
source
of
Q4,
25K19GR
is
grounded
and
then
the
signal
is
amplified
by
O4
and Q6,
25K19GR
of
which
gain
is
controlled
by
the
ALC
voltage
declined
from
the
final
amplifier
grid
circuit
to
prevent
the
distor-
tion
which
may
be
caused
by
the
over
drive.
A
potentiometer
VR1
is
used
to
preset
the
signal
level
equal
for
the
both
of
processor
ON
and
OFF.
With
the
RF
processor
switch
ON,
the
pin
3
af
Q2,
TA?70609
is
grounded
and
it
works
as
dipper
tor
the
signals
that
exceed
the
predetermined
level,
The
clipped
signal
is
fed
through
the
source
fol-
lower,
Q3,
28K19GR
to
a
crystal
filter
XF30A
to
eliminate
the
harmonies
generated
by
the
clipper.
Then
the
signal
amplitude
is
conerolled
by
Q5,
PSC3727.
Q3
varies
its
resistance
between
collector
and
ground
by
the
voltage
applied
to
the
gate
fram
a
potentiometer
VR3b
located
on
the
front
panel,
(10)
RECTIFIER
UNIT
(PB-1076B)
The rectifier unit PB-1076B is located under the
main chassis in the power supply compartment,
and delivers four different DC voltages. The
power amplifier plate voltage (600 Voles Dt) is
supplied from the bridge connected silicon recti-
fiers D1-D4 and D9-D12. 300 Volts DC is also
obtained from this circuit for the driver plate
supply.
160 Volts DE and—100 Volts DC are obtained
through D5 and D6. D5 supplies. the final tubes
screen grid voltage, and D6 is used for the bias
supply.
10,5 Volt AC is rectified by D7 and D8 for the
transister supply voltage.
(11) MAIN CHASSIS
The main chassis contains the power supply, transmitter
driver, final amplifier and other associated circuits, All
sockets for plugan modules are mounted on the main
chassis,
(A) POWER SUPPLY
The power supply is designed to operate from either
TOON ITT ZOO 220/234 volts AC or 12 volts DC
(negative ground} Inserting the appropriate power plug
into the rear panel receptacle makes the necessary
connections to operate the supply in either mode, AC
or DCU,
When the transcerver 1s operated from a 12 volt DC
power source, transistors QI and Q2, 2SB206 fune-
tion as a low frequency oscillator to provide AC to
the power transformer. Starting bias for the oscillator
is obtained from divider resistors RG, R4 and RS. All
of the tubes heaters and input voltage to the DC con.
verter are supplied through the HEATER switch,
With the HEATER switch in the “OFF” positian,
voltage is still supplied to the receiver section,
which
allows
continuous
reception
at
reduced
power consumption levels,
The fugh-voltage winding of the power transformer
Tl ts connected to a bridge-type selid state rectifier
to supply appreximately +600 volts and +300 volts
to the transmitter tubes. Output from the 120 volt tap is
rectified
to
deliver
+160
volts
to
the
screen
grids
and
—100
volts
for
the
bias
supph,
During
AC
operation,
TT]
is
energized
by
two
primary
windings.
These
windings
can
be
connected
in
series
for
200/220/234
volts
and
in parallel for 1OO/110/117 volts operation.
The output from a high current winding of 10.5 volts
is
rectified
and
is
used
to
supply
the
transistorized
stages.
(By PRESELECT
The preselect contro! adjusts three gang-tuned coils
THA, T102 and T1035. TLOTA tunes the receiver
front
end,
T1LO2
provides
interstage
tuning
on
receive
as well as driver grid tuning on transmit. [103
tunes
the
driver
plate
circuit.
T1H4,
T1105
and
TLO6
are placed in the circuit when the band switch is
in 160 thru 40 meter band to abtain aproper impe-
dance match for minimum distortion,
TI as connected to the heterodyne crystal Al— All
through the band switch and delivers the Signal from
the secandary to the mixer stages
Diode switches are used in several locations for isola
bon of the circuits.
—)

(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