Kenwood TS-830S User manual

@KENWOOD
Model TS-830S
INSTRUCTION MANUAL

AFTER UNPACKING
It is advisable to save all original packing cartons (inner and
outer) to protect your valuable transceiver from damage
should you wish to transport it for remote operation or ship it
for after-sales service.
The following explicit definitions apply in this manual. Be
sure to read these definitions:
WARNING: Personal injury may occur — do not
disregard.
CAUTION:
Read Operating Manual Section 4. before placing
transmitter in service.
WARNING:
HIGH VOLTAGES PRESENT.
CONTENTS ~
NOTE: If disregarded, inconvenience only — no
damage or personal injury.
CAUTION: Equipment damage may occur, but not
personal injury.
SPECIFICATIONS 5 7.2 85.2 72sssccsspsecaptecasssattsbinsto ieee cia
SECTION 1. INTRODUCTION AND FEATURES.... 4
SECTION 2. INSTALLATION
2.1. Unpacking
2.2 Operating Location
2.3 Cabling
2.4 Microphone
2.5 Key
2.6 External Speaker and Headphones
2.7. Ground
2.8 Antenna
SECTION 3. CONTROLS AND THEIR FUNCTIONS 8
3.1 Front Panel
3.2 Rear Panel
SECTION 4. OPERATION. « .ic55:.c2strcc>ocnccceeasspaessnneae 14
4.1 Reception (I)
(1) Basic Procedures for Receive Operation
(2) WWV Reception
4.2 Reception (II)
(1) RF ATT Switch
(2) RF Gain Control
(3) AGC (Automatic Gain Control)
(4) RIT/XIT
(5) VBT Control (Variable Bandwidth Tuning)
(6) IF Shift
(7) VBT and IF Shift Combination
(8) Notch Control
(9) Noise Blanker (NB)
(10) Tone Control
4.3 Transmission (I)
(1) SSB Operation
4.4 Transmission (II)
(1) Speech Processor
(2) VOX (Voice Operated Transmit) Operation
(3) XIT (Transmitter Incremental Tuning)
(4) Monitor
(5) CW Operation
4.5 Fixed Channel Operation
4.6 Digital Display Calibration
4.7 Analog Dial Calibration
SECTION 5. OPTIONAL ACCESSORIEG................ 22
5.1 Optional Accessories
5.2 Installation of Accessories
SECTION 6. MAINTENANCE AND ALIGNMENT .. 26
6.1 General
6.2 Service Position
6.3 Receiver Adjustments
6.4 Transmitter Adjustments
6.5 Transmitting on WARC BANDS
6.6 Ordering Spare Parts
6.7 Service
TROUBLESHOOTING ..
BLOCK DIAGRAM
SCHEMATIC DIAGRAM.
INTERNAL VIEW
31

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TS-830S SPECIFICATIONS |
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[GENERAL]
Frequency Range ...................00cceceeeeeeeeees 160m Band 1.8 ~ 2.0MHz
80m Band 3.5 ~ 4.0 MHz
40m Band 7.0 ~ 7.3 MHz
* 30 m Band 10.1 ~ 10.15 MHz
(10.0 MHz WWV)
20 m Band 14.0 ~ 14.35 MHz
* 17 m Band 18.068 ~ 18.168 MHz
15 m Band 21.0 ~ 21.45 MHz
* 12 m Band 24.89 ~ 24.99 MHz
10 m Band 28.0 ~ 29.7 MHz
Wadlesyiivarnias Sredacedixtb sede pemyaaiesind anes SSB/CW
Power Requirement . .. 120V AC (220V modifiable), 50/60 Hz
Power Consumption.... .. Transmit: 295 watts
Receive: 32 watts (with heaters off)
Dimensions 5 si5.5 scavsiccesgccesanestneeansinst ees 333 (13.3) x 133 (5.3) x 333 (13.3) mm (inch)
IWGIGIG rss ses coc unceapneetstkteaatiewdestoeeerceeres 13.5 kg (29.8 Ibs)
[TRANSMITTER]
*Final POWGrINPUl...66.050s005deecccnsebevecreacesens 220W PEP for SSB operation
180W DC for CW operation
Audio Input Impedance .......................005 5002 ~ 50 kQ
RF Output Impedance ... . 502 ~ 752
Frequency Stability . Within 100 Hz during any 30 minute period after warmup.
Within 1 kHz during the first hour after 1 minute of warmup.
Carrier Suppression........................0..ccceeee Better than 40 dB
Sideband Suppression ... . Better than 60 dB
Spurious Radiation . Better than 60 dB
Harmonic Radiation . Better than 40 dB
Audio Freq. Response - 400 to 2,600 Hz, within —6 dB
3rd Order Intermodulation Distortion....... Better than —36 dB
[RECEIVER]
Receiver Sensitivity ....
Image Ratio .
IF Rejection .
Receiver Selectivity
SSB/CW WIDE
CW NARROW ....
.. 0.25 wV at 10 dB S+N/N
. Better than 60 dB
. Better than 80 dB
. 2.4 kHz (—6 dB), 3.6 kHz (—60 dB)
. With YK-88C (option) 500 Hz (—6 dB),1.5 kHz (—60 dB)
With YK-88CN (option) 270 Hz (—6 dB), 1.1 kHz (—60 dB)
With YG-455C (option) 500 Hz (—6 dB), 820 Hz (—60 dB)
With YG-455CN (option) 250 Hz (—6 dB), 500 Hz (—60 dB)
,
Variable Bandwidth
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With optional filter YK-88C and YG-455C added.
Notch-filter Attenuation ... . Better than 40 dB
Audio Output Impedance . . 8~ 162
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*Will
transmit
on
the
new
30,
17,
and
12
meter
bands.
Diodes
installed
for
preventing
accidental
transmission before government Amateur authorization.
NOTE:
The
circuit
and
ratings
may
change
without
notice
due
to
developments
in
technology.

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1.1 KENWOOD TS-830S
The
TS-830S
is
a
highly
sophisticated
solid
state
Amateur
band
transceiver
employing
only
three
vacuum
tubes.
Operating
on
all
Amateur
bands
between
1.8
and
29.7
MHz,
this
unit
is
constructed
modularly.
The
TS-830S
includes
many
built-in
features
usually
found
as
extras
on
other
transceivers.
Included
are
VOX,
25
kHz
calibrator,
RIT,
RF
attenuator,
and
an
effective
noise
blanker.
The
TS-830S
also
includes
automatic
gain
control
(AGC),
automatic
level
control
(ALC),
semi-break-in
CW
with
sidetone,
a
speech
processor,
speaker
and
built-in
AC
power
supply.
Designed
for
operation
on
SSB
or
CW,
the
TS-830S
delivers
more
than
220
watts
PEP
input.
Any
complicated
electronic
device
will
be
damaged
if
Operated
incorrectly,
and
this
transceiver
is
no
exception.
Please
read
all
of
the
operating
instructions
before
putting
the
TS-830S
on
the
air.
1.2 FEATURES
1. Interference-free DX operation
*
Variable
bandwidth
IF
filter
circuit
(VBT)
The
built-in
VBT
(Variable
Bandwidth
Tuning)
circuit
al-
lows
IF
filter
pass-bandwidth
to
be
varied
as
you
wish
to
eliminate
unpleasant
interference.
It
is
adjustable
independent of the IF shift.
* IF shift circuit
The IF SHIFT is a circuit to shift IF pass-bandwidth
without changing receive frequency. It eliminates
interference
or
adjusts
receive
frequency
characteristic
as desired.
*
High
reliability
455
kHz
notch
circuit
Interference
is
also
eliminated
by
the
built-in
notch
circuit.
The
TS-830S
uses
455
kHz
notch-frequency.
The
notch
circuit
shifts
the
BFO
frequency
and
the
mixer
local
frequency
at
the
same
time,
thereby
equiva-
lently
changing
the
notch
frequency.
Thus,
accurate
notch
characteristic
is
realized
even
when
the
notch
point
is
changed,
completely
eliminating
nearby
inter-
ference signals.
*
NARROW/WIDE
BANDWIDTH
selection
and
optional
filters for enhanced CW operation:
NARROW
or
WIDE
CW
operation
can
be
selected
when
using the following optional filters:
YK-88C
(500
Hz),
YK-88CN
(270
Hz),
YG-455C
(500
Hz),
YG-455CN
(250
Hz)
*Variable tone control circuit.
2. WARC bands
The
TS-830S
fully
covers
160-10
m
Amateur
bands,
including
the
new
WARC
bands
of
10,
18
and
24.5
MHz.
3.
All-in-one,
compact
AC
Power
supply
system
SECTION
1.
INTRODUCTION
AND
FEATURES
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4.
Advanced
circuit
design
for
improved
two-signal
cha-
racteristics.
Cleverly
deisgned
front-end
circuit
compo-
nents
and
receive
circuit
system
assure
excellent
two-signal
characteristics.
Cross-modulation
and
blocking
are
reduced.
5.
TX
final
unit
uses
6146B's
The
finals
are
a
pair
of
6146B
transmitting
tubes.
RF
negative
food
back
and
amplified
ALC
provide
clear,
strong
signals
with
reduced
cross
modulation.
6. Variable level noise blanker
Conventional
fixed
level
noise
blankers
are
sometimes
less
than
effective
in
removing
pulsating
noise
over
weak
signals
or
rejecting
strong
interference
signals.
This
variable
level
noise
blanker
is
equipped
to
control
the
optimum
threshold
level
of
the
gate
pulse
amplifier.
7.
RF
speech
processor
to
increase
average
power
during
SSB
operation
This
is
an
RF
clipper
speech
processor,
using
both
the
455
kHz
and
8.83
MHz
IF’s.
Unwanted
frequency
components
are
removed
by
the
8.83
MHz
crystal
filter,
providing
a
compression
ratio
of
approximately
20
dB.
8.
Transmit
monitor
circuit
The
built-in
monitor
circuit
permits
easy
adjustment
of
the
RF
processor
and
MIC
GAIN.
9.
XIT
(Transmit
Incremental
Tuning)
for
fine
adjustment
of
transmit
frequency
independent
of
receive
frequency.
10.
A
combination
of
precise.
easy-to-read
digital
frequency
indicator and an analog dial.
The
digital
indicator
has
a
Digital
Hold
memory
function.
11.
The
controls
are
arranged
on
the
die-cast
front
panel
for
easy operation.
12.
A
full
variety
of
accessory
circuits
are
provided:
The TS-830S includes:
VOX
circuit
(available
for
Semi-Break
in),
Marker
circuit,
side-tone
oscillator,
3-position
AGC
circuit
(OFF,
FAST,
SLOW),
RF
ATT,
FIX
circuit,
Audio
frequency
cha-
racteristics
selecter
circuit
for
each
MODE,
CW
zero-in
circuit,
IF
OUT
terminal,
HEATER
switch,
SG
switch,
Built-in
speaker.

2.1 UNPACKING
Remove the TS-830S from its shipping container and
packing material and examine it for visible damage. If the
equipment has been damaged in shipment, notify the
transportation company immediately. Save the boxes and
packing material for future shipping or moving.
The following accessories should be included with the
tranceiver.
1. Instruction Manual (B50-2738-00) .................. 1
2. Plastic Extension Feet with Screws
(J02-0049-14)
3. Speaker Plug 1/8” (E12-0001-05).
4. 7P DIN Plug (E07-0751-05)
5. Fuse (6A) (FO5-6021-05) .
ae re) ee,
2.2 OPERATING LOCATION
As with any solid state electronic equipment, the TS-830S
should be kept from extremes of heat and humidity.
Choose an operating location that is dry and cool, and avoid
Operating the transceiver in direct sunlight. Also, allow at
least 3 inches clearance between the back of the equipment
to any object. This space allows an adequate air flow from
the ventilating fan to keep the transceiver cool.
INSTALLATIO
CAUTION:
Do not operate the radio in an RF Field greater than 6V RF.
Receiver damage may occur.
2.3 CABLING (See Figure 2-1.)
™ GROUND
To prevent electric shock, and reduce the possibility of TVI
and BCI, connect the transceiver to a good earth ground,
through as short a lead as possible. Use ground rods or
metal cold water feedline.
@ ANTENNA
Connect through a 50 ohm antenna feedline to the coaxial
connector on the rear panel.
@ KEY
If CW operation is desired, connect a key to the KEY jack.
Use shielded line or coaxial cable.
@ POWER CONNECTIONS
Make sure the POWER switch on the front panel is turned
off, the stand-by switch is in the REC position, and the line
voltage is correct. Then connect the POWER cord to the line
source.
ocensr-canen
@ AC POWER
For fixed station operation, the TS-830S operates from 120
VAC, 50/60 Hz power source capable of supplying 280
watts or more.
2.4 MICROPHONE
Attach the microphone connector to a suitable microphone,
as shown in Figure 2-1. Be sure the microphone PTT switch
is separate from the microphone circuit, as shown in Figure
2-3.
It should be noted that a microphone with a 3P plug using a
common ground terminal should not be used.
The microphone input is designed for 50 kohm micropho-
nes. The choice of microphone is important for good speech
quality, and should be given serious consideration. The
crystal lattice filter in the transceiver provides all the
restriction mecessary on audio response, and _ further
restriction in the microphone is not required. It is more
important to have a microphone with a smooth, flat
response throughout the speech range.
Follow the microphone manufacturer's instructions for con-
necting the microphone cable to the plug. With many
microphones, the push-to-talk button must be pressed to
make microphone audio available. For VOX operation, this
unwanted feature may be eliminated, if desired, by opening
the microphone case and permanently connecting the
contacts which control the microphone audio.
Standard microphone sensitivity is within the range of —50
dB to —60 dB. If a microphone having a higher sensitivity
is used, the ALC and compressor circuits will not function
properly. In this case, insert in the mike line an attenuator as
shown in Fig. 2-1. A typical MIC gain control setting is 12
o'clock. If you must run this control at 9 o'clock or less, use
an attenuator.
2.5 KEY
If CW operation is desired, connect a key to the KEY jack.
Use shielded cable, and a standard (mono or 2P) phone plug.

Headphones
Use headphones of 4 to 162 im-
pedance. The optional HS-4, HS-5
headphones best suited for use with
the TS-830S. Stereo-type stet pho-
nes can also be used.
Microphone
Either a low or high impedance
microphone (5002 to 50 k{2) can be
used. The P.T.T. switch should be
isolated from the mic circuit (shown
in “A”). Use a microphone with a
separate switch and MIC line so both
P.T.T. and VOX are available.
View from cord side
Transformer
Microphone [) © 3 g
{a) this & Switch 2
Transformer
Microphone ) e 3 g g Switch
(b) not this
Microphone ) e€ 3
Transformer
\ Switch
(c) not this
TS-830S
Microphone
P Microphone connector
Antenna
Key
For CW operation, connect your key
to the KEY jack at the rear. Use
shielded cable.
monitor scope. Connect to the rear EXT
SP jack using the supplied
plug
Monitor scope External speaker
a © Of} sm-220 Besides the built-in
° © ooff Can be used as a speaker, an external
band scope or a speaker can also be used.
arrestor
GND terminal
It is recommended that a ground
lead be connected to the GND ter-
minal at the rear of the set to prevent
the possibility of electric shock, TVI
and BCI. Use as short, and heavy a
lead as possible.
Linear amp
Power supply
Transverter
120V 50/60 Hz :
External VFO
Fig. 2-1 Connection

2.6 EXTERNAL SPEAKER AND
HEADPHONES
Receive audio output from the TS-830S is 1.5 watts at 4 to
16 ohms. The TS-830S has a built-in the SPEAKER jack on
the rear panel. The speaker may be an 8-ohm perma-
nent-magnet type, 4 inches or larger. The internal speaker is
disconnected when an external speaker is used. Headpho-
nes should also be 4 to 16 ohms impedance. When the
headphones are connected to the front-panel PHONES jack,
the speaker is disabled.
2.7 GROUND
To prevent electric shock, and reduce the possibility of TVI
and BCI, connect the transceiver to a good earth ground
through as short and heavy a lead as possible.
2.8 ANTENNA
Any of the common antenna systems designed for use on
the high frequency amateur bands may be used with the
TS-830S, provided the input impedance of the transmission
line is not outside the capability of the pi-output matching
network. The transmission line should be coaxial cable. An
antenna system which shows a standing wave ratio of less
than 2:1 when using 50 or 75 ohm coaxial transmission
line, or a system that results in a transmission line input
impedance that is essentially resistive,, and between 15 and
200 ohms will take power from the transceiver with little
difficulty. If openwire or balanced type transmission line is
used with the antenna, a suitable antenna tuner with balun
is recommended between the transceiver and the feed line.
Methods of construction and operating such tuners are
described in detail in the ARRL Antenna Handbook, and
similar publications. For operation on the 160, 75 and 40
meter bands, a simple dipole antenna, cut to resonance in
the most used portion of the bands, will perform satisfacto-
rily. For operation of the transceiver on the 10, 15 and 20
meter bands, the efficiency of the station will be greatly
increased if a good directional rotary antenna is used.
Remember that even the most powerful transceiver is
useless without a proper antenna.
NOTE:
Protect your Equipment — Use a LIGHTING ARRESTOR.
Mobile Station — Mobile antenna installations are critical,
since any mobile antenna for use on the high frequency
bands represents a number of compromises. Many
amateurs lose the efficiency of their antenna through
improper tuning. Remember the following points when
using the TS-830S with a mobile antenna.
The
“Q”
of
the
antenna
loading
coil
should
be
as
high
as
possible.
The
loading
coil
must
be
capable
of
handling
the
power
of
the
transceiver
without
overheating.
In
the
CW
mode
the
power
output
of
the
transceiver
will
exceed
80
watts.
The
SWR
bridge
is
a
useful
instrument,
but
unfortunately
it
is
quite
often
misunderstood,
and
overrated
in
importance.
Basically,
the
SWR
bridge
will
indicate
how
closely
the
antenna
load
impedance
matches
the
transmission
line.
With
long
transmission
lines,
such
as
will
be
used
in
many
fixed
station
installations,
it
is
desirable
to
keep
the
impedance
match
fairly
close
in
order
to
limit
power
loss.
This
is particularly
true
at
the
higher
frequencies.
The
longer
the
line,
and
the
higher
the
frequency,
the
more
important
SWR_
becomes. However,
in
mobile
installations
the
transmission
line
seldom
exceeds
20
feet
in
length,
and
an
SWR
of
even
4 to
1
adds
very
little
power
loss.
The
only
time
SWR
will
indicate
a
low
figuro
is
when
the
antenna
presents
a
load
close
the
50
ohms,
but
many
mobile
anten-
nas
will
have
a
base
impedance
as
low
as
15
or
20
ohms
at
their
resonant
frequency.
In
such
a
case,
SWR
will
indicate
3
or
4
to
1,
and
yet
the
system
will
be
radiating
efficiently.
The
really
important
factor
in
your
mobile
antenna
is
that
is
should
be
carefully
tuned
to
resonance
at
the
desired
frequency.
The
fallacy
in
using
an
SWR
bridge
lies
in
the
fact
that
it
is
sometimes
possible
to
reduce
the
SWR
reading
by
detuning
the
antenna.
Field
strength
may
actually
be
reduced
in
an
effort
to
bring
SWR
down.
Since
field
strength
is
the
primary
goal,
we
recommend
a
field
strength
meter
for
antenna
tuning.
For
antenna
adjustments,
the
transceiver
may
be
loaded
lightly,
using
the
TUNE
position
instead
of
operating
at
full
power
output.
This
will
limit
tube
dissipation
during
adjustments,
and
will
also
help
to
reduce
interference
on
the
frequency.
In
any
case,
do
not
leave
the
transmitter
on
for
very
long
at
one
time.
Turn
it
on
just
long
enough
to
tune
and
load,
and
get
a
field
strength
reading.
Start
out
with
the
antenna
whip
at
about
the
center
of
its
adjustment
range.
Set
the
VFO
to
the
desired
operating
frequency
and
then
adjust
the
PLATE
control’
for
a
dip,
and
then
the
LOAD
control.
Then
observe
the
field
strength
reading.
The
field
strength
meter
may
be
set
on
top
of
the
dash,
on
the
hood,
or
at
an
elevated
location
some
distance
from
the
car.
Change
the
whip
length
a
half
inch
or
so
at
a
time,
retune
the
finals
each
time,
and
again
check
the
field
strength
at
the
antenna.
Continue
this
procedure
until
the
point
of
maximum
field
strength
is
found.
This
adjustment
will
be
most
critical
on
75
meters,
somewhat
less
critical
on
40,
until
on
10
meters
the
adjustment
will
be
quite
broad.
After
tuning
the
antenna
to
resonance,
the
finals
can
be
loaded
to
full
power.

@ NOTCH INDICATOR LED ®»
@ VFO INDICATOR LED.
@ FIX INDICATOR LED
@ DIGITAL DISPLAY
@ RFATT INDICATOR LED ®
© DH SWITCH
© METER
@ PROC SWITCH @)
@® COMP LEVEL CONTROL ():
@ NB SWITCH ®
(® NB LEVEL CONTROL ®)
@ AGC SWITCH ®
@ METER SWITCH
@ STAND-BY SWITCH®
@ VOX GAIN @
a3) VOX DELAY @,
@® PHONES JACK ®)
(® MIC CONNECTOR ©)
( MODE SWITCH
@
MIC
GAIN
CONTROL
pedal
@® CAR LEVEL CONTROL ©:
@ FIX SWITCH
@) ANALOG DIAL SCALE
@) MAIN TUNING
@ LOAD CONTROL @
———_—_——————-‘# PLATE CONTROL @
@) DRIVE CONTROL
30 RIT/XIT LED
@) RIT/XIT CONTROL
32 BAND SWITCH
@ +0.5 SWITCH
@ RFGAIN ®
@ AFGAIN ®
(36) POWER SWITCH
G2) HEATER SWITCH
G8 VBT CONTROL ®
39 TONE CONTROL ®
@ IF SHIFT CONTROL ®
@ NOTCH CONTROL ®
@ MONI SWITCH ©:
@ NOTCH SWITCH ®
@ RF ATT SWITCH ®-
@® XIT SWITCH @®
@ RIT SWITCH €
®

3.1 FRONT PANEL
The symbol after the part name indicates:
®: Active only during reception.
@: Active only during transmission
No symbol: Always active
1. NOTCH INDICATOR LED ®
This indicator, (light emitting diode), illuminates when the
NOTCH circuit is turned ON.
2. VFO INDICATOR LED
The VFO indicator illuminates when the internal VFO
controls transceiver operation. The indicator is not lighted
during fixed channel or remote VFO operation.
3. FIX (FIXED CHANNEL) INDICATOR LED
The FIX indicator illuminates when the internal fixed
frequency oscillator controls transceiver operation.
4. RF ATT INDICATOR LED ®
This illuminates when the RF ATT is turned ON.
5. DH (DISPLAY HOLD) SWITCH
With this switch ON, the display frequency remains ON even
if the main tuning is changed. This feature is used to memo-
rize the original frequency when checking another frequency.
6. METER
The meter monitors six different functions, depending on
METER switch position. In receive the meter is
automatically an S-meter, and shows received signal
strength on a scale of O to 40 dB over S9. In transmit,
meter function depends on the position of the METER
switch, as described below. This is an average-responding
meter, NOT peak-reading.
7. PROC (SPEECH PROCESSOR) SWITCH @
This switch is used during SSB operation. Set the switch to
the ON position and the speech processor will be activated,
increasing the average talk power. Compression level can
be adjusted by the processor control (8).
8. COMP LEVEL CONTROL @®
This control adjusts compression level. Set the meter switch
(12) to the COMP position and adjust this control while
observing the meter COMP scale.
9. NB SWITCH ®
With the lever switch UP, the noise blanker circuit is turned
ON reducing pulse-type (ignition) noise. Power-line, radar,
QRM and atmospheric “white” noises will not operate the
blanker. The noise blanker circuit operating level is
adjustable by the noise blanker control (10).
10. NB LEVEL CONTROL ®
This control adjust the noise blanker circuit (operating level)
according to receiving conditions or noise level.
11. AGC SWITCH ®
This controls the AGC (Automatic Gain Control) circuit:
walenieets AGC disabled (no AGC).
...
Normally
used
for
CW
operation.
..
Normally
used
for
SSB
operation.
12. METER SWITCH
This determines the transmit meter function:
ALC (Automatic Level Control)
Monitors internal ALC voltage, or the ALC voltage
feedback from a linear amplifier operated in conjunction
with the TS-830S. For SSB operation the ALC reading
for voice peaks should be within the indicated ALC
range. ALC voltage adjustment is made with the MIC
control for SSB and with the CAR control for CW.
IP (Plate Current)
In this position the meter monitors final tube plate cur-
rent. The scale is calibrated from O to 350 ma.
RF (Output Power)
This monitors relative output power of the transceiver.
There is no meter scale for this position. Normally the
reading should be adjusted (with the RF VOLT control)
for a 2/3 scale reading.
COMP
This indicates compression level when the speech
processor is operating.
HV (High Voltage)
This position monitors the high voltage power supply.
The meter scale is calibrated from O to 10, indicating O
to 1000 volts.
13. STAND-BY SWITCH @®
This two-position lever switch selects:
REGCi
8
casssedics
The
transceiver
is
receiving
unless
the
microphone
PTT
switch,
or
the
VOX
circuit
is
activated.
-- Locks the unit in transmit.

14. VOX GAIN @
This controls sensitivity of the VOX (Voice Operated
Transmit) circuit.
15. VOX DELAY CONTROL @®
The DELAY control adjusts the hold time for VOX or break-in
CW operation. Adjust for individual preference.
16. PHONES JACK ®
The headphones jack allows use of a 4 to 16 ohm
headphone through a 1/4” phone plug. When phones are
used the speaker is disconnected.
17. MIC CONNECTOR @
The four pin connector allows use of a PTT microphone.
Figure 2-1B shows plug wiring.
18. MODE SWITCH
The mode switch selects type of emmission; and TUNE.
TUNE simaieovs This position provides reduced carrier and
shorted key line for transceiver tuning. (Input
power to the final section is reduced to
prevent tube damage during tune-up.)
. Used for CW operation. A high-cut filter is
inserted in the receiver audio circuit to
reduce unwanted noise.
SSB filter selected for WIDE receive
bandwidth.
GWEN incense (NARROW) Used for CW operation with CW
filters YK-88C (500 Hz), YK-88CN (270 Hz),
YG-455C (500 Hz) or YG-455CN (250 Hz),
which are available as optional accessories.
Without an optional CW filter installed, the
pass-bandwidth is the same as in CW.W.
SB steweeested Used for upper-sideband operation. Inter-
national Amateur practice dictates the use of
USB on the 10, 14, 18, 21, 24.5 and 28
MHz bands.
CSB) secu ayes Selects lower-sideband. International
Amateur practice dictates the use of LSB on
the 1.8, 3.5 and 7 MHz bands.
19. MIC GAIN CONTROL @®
This control adjusts microphone amplifier gain for SSB
operation. Adjust for an on-scale ALC reading on voice
peaks.
In the CAL ON position, receive frequency can be calibrated
at 25 kHz intervals using the built-in oscillator.
10
20. CAR LEVEL CONTROL @
This controls carrier level during CW operation. Adjust for
approximately 250 mA of plate current.
21. FIX SWITCH
Place this switch ON for fixed channel operation;
(an optional crystal is required. Trio-Kenwood does not
supply these crystals.)
22. MONI (MONITOR) SWITCH @
This delivers a sample of the demodulated transmit IF signal
to the AF for monitoring modulation.
23. RF ATT SWITCH ®
With this switch ON, A 20 dB attenuator is inserted in the
antenna circuit, protecting the RF amplifier and mixer from
overload on strong input signals.
24. DIGITAL DISPLAY
The digital display indicates operating frequency to the
nearest 100 Hz.
25. ANALOG DIAL SCALE
The mono-scale permits direct analog frequency readout
over the O to 500 kHz range, graduated at 1-kHz intervals.
Operating frequency equals the dial (in kHz) plus the BAND
switch frequency (in MHz). An additional 50 kHz both
above and below the 500 kHz range is also covered.
26. MAIN TUNING
This controls the VFO, selecting the transceiver’s operating
frequency. The indented knob is convenient for quick
tuning.
27. LOAD CONTROL @
This controls the loading of the network between the final
section and the antenna. Adjustment is described in Section
4.
28. PLATE CONTROL @
This controls the plate tuning of the final amplifiers. Ca-
libration is approximate.
29. DRIVE CONTROL
This control tunes the plate tank circuit of the 12BY 7A
driver as well as the receiver's antenna and mixer coils. In
receive the DRIVE control is tuned for maximum sensitivity
(maximum S-meter deflection), and in transmit for a
maximum ON-SCALE ALC reading. These points occur
concurrently. Tuning for one also achieves the other.