Kenwood TS-930S User manual

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AFTER UNPACKING
It is advisabte 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:
NOTE: if distegarded, inconvenience only — no
damage or personal injury.
NOTE: This manual covers the TS-930S with the
AT-930 Automatic antenna tuner installed.
If your transceiver dees not contain the
AT-930, please disregard any mention of
Automatic antenna tuner operation.
CAUTION: ———___--
Read Operating Manual Section § before placing transmit-
CAUTION:
—
Equipment
damage
may
occur,
but
not
per-
Horintsorvices
sonal
injury.
CONTENTS
SECTION
1.
SPECIFICATIONS
0.00.0.
Re
5.3
Transmission
(1)
SECTION
2.
INTRODUCTION
AND
FEATURES
5
5.4
Transmission
(Il)
SECTION 3. {INSTALLATION
3.1. Unpacking
3.2 Operating precautions
3.3 Operating Location
3.4 Cabling
3.5 Microphone
3.6 Key
3.7 External Speaker and Headphones
3.8 Ground
3.9. Antenna
SECTION
4.
CONTROLS
AND
THEIR
FUNCTIONS
10
4.1 Front Panel
4.2 Rear Panel
SECTION 5. OPERATION
5.1 Reception (I)
(1) Basic Procedures for Receive Operation
{2), WWV Reception
5.2 Reception (1D
(i) RE ATT Switch
(2) RF Gain Controt
(3) AGC (Automatic Gain Control)
{4} RIT
(5) SSB SLOPE TUNE Control
(6) CW VBT Control
{7} Notch Control
{8} AF TUNE Circuit
(9) Noise Blanker (NB}
14
5.5 BAND Switch
5.6 Two VFO Operation
5.7 MEMORY CH Operation
5.8 TF SET Operation
5.9 COOLING FAN Operation
5.10 SHORT WAVE RECEPTION
SECTION
6.
OPTIONAL
ACCESSORIES
_..........
22
6.1 PERIPHERAL Devices and Options
6.2 Installation of Accessories
6.3 Optional Fitter Installation
6.4 AT-930 Installation
6.5 Remote Control Wiring
SECTION
7.
CIRCUIT
DESCRIPTION
|...
33
7.1
BLOCK
DIAGRAM
7.2
Units
7.3
Auto
Antenna
Tuner
SECTION
8.
MAINTENANCE
AND
ALIGNMENT
85
8.1 Preparation
8.2 Adjustments
8.3. Maintenance
8.4 Transmitting WARC bands
SECTION
9.
TROUBLESHOOTING
|...
2.0.
000..37
SECTION
10.
INTERNAL
VIEWS.
38
SECTION
11.
BLOCK
DIAGRAM
39
SECTION
12.
SCHEMATIC
DIAGRAM
40

(a
SECTION
1.
SPECIFICATIONS
_
|
i
[GENERAL]
Transmitter Frequency
Range:
Receiver Frequency
Range:
Mode:
Antenna Impedance:
With AT-930
antenna tuner
Power Requirement:
Power Dissipation:
Dimensions:
Weight:
[TRANSMITTER]
Final Power Input:
Cartier Suppression:
Unwanted Sideband
Suppression:
Harmonic Content:
Audio Frequency
Response:
Modulation:
FSK Shift:
Modutation Distortion:
FSK Shift:
Modulation Distortion:
Microphone impedance:
ALC Input:
Linear Amplifier
Switching:
160 m Band 1.8 ~2.0 Miz
80 m Band 3.5~ 4.0 MHz
40 m Band 7.0~7.3 MHz
30m Band 10.1~10.15 MHz
(10.0 MHz WWV)
20m Band 14,0~14.35 MHz
17 m Band
18.068 ~ 18.768 MHz
15m Band 21.0~21.45 MHz
12 m Band
24.89 ~ 24.99 MHz
10m Band 28.0~29.7 MHz
150 kHz - 30 MHz
A3J (USB, LSB}, A1 (CW), F1
{FSK), A3 (AM)
50 ohms
20 - 150 ohms (80 - 10 meter
Amateur bands only. However,
30~ 100 ohms for 18 MHz
and 24.5 MHz.)
120/220/240 VAC, 50/60 Hz
Max. 510 W during transmis-
sion, 80 W during reception
374(14-3/41Wx 141
{5-9/1 61H x 360(13-13/16 ID
mm finches)
With antenna tuner:
Approx. 18.5 kg (40.8 Ibs}
Without antenna tuner:
Approx. 18.8 kg (37.0 Ibs}
SSB/CW/FSK 250 W
AM 80 W
Better than 40 dB
Better
than
50
dB
(with 1
kHz
modulation)
Less
than
—40
dB
400 - 2,600 Hz/-6 4B
$S8: Balanced modulation
AM: Low fevel modulation
{tF stage)
170 Hz
Less than —31 dB
170 Hz
Less than —31 dB
500 ohms ~ SO kohms
—10 V DC MAX
200 V DC MAX
100 mA
[RECEIVER]
Circuitry:
Intermediaté
Frequencies:
Sensitivity
fat 10 dB S+N/N}
150 - 500 kHz:
$00 kHz - 1.8 MHz:
1.8 - 30 MHz:
Image Ratio:
IF Rejection:
Selectivity
Quadruple conversion
IstiF: 44.93 MHz
2nd IF: 8.83 MHz
3rd IF: 455 kHz
4th IF: 100 kHz
Less
than
1
pV
for
SSB,
CW
and
FSK
Less
than
10
xV
for
AM
Less
than
4
xV
for
SSB,
CW
and
FSK
Less
than
32
xV
for
AM
Less than
0.25
pV
for
SSB,
CW
and
FSK
Less than 2 xV for AM
More than 80 dB
(1.8
MHz~30
MHz)
Mote than 70 dB
(1.8 MHz~30 MHz)
(W-wide, N-narrow filter
selection}
SSB,
CWIW},
FSKIWI,
AMIN):
CWIN), FSKIN}:
AMIW):
SSB Slope Tune:
CW VBT
CWIW), FSK(WI
AMIN):
CWIN), FSK(N}:
AMIW):
2.7 kHz/—6 aB,
4.0 kHz/—60 dB
Without
optional
filter:
same
as.
CW{W), FSK(W)
With
optional
YG-455C-1:
500 Hz/—6 dB,
820 Hz/-60 dB
With
optional
YG-455CN-1;
250 Hz/—6 dB,
480 Hz/-—60 dB
With
optional
YK-88C-1:
500 Hz/—6 dB,
1.5 kHz/—60 4B
Without
optional
filter:
6
kH2z/-6
dB,
18 kHz/—60 dB
With
optional
YK-88A-1:
6 kHz/—6 dB,
71 kHz/—60 ¢B
High-cut:
More
than
1500
Hz
shift/—6 dB
Low-cut:
More
than
700
Hz
shift/—6 dB
600
Hz
~
2.7
kHz/~6
dB
Without
optional
filter:
same
as
CwiW),
FSKIW}
With
optiona!
YK-88C-7
and
YG-455C-t
installed:
150
Hz~500
Hz
—6
d8
With
optional
YK-88A-1:
4
kHz~6
kHz/—6
dB

Frequency Stability:
Frequency Accuracy:
RIT Variable Range:
Notch Filter Attenuation:
Phone Patch Output Z:
Audio Output Power:
Within 4200 Hz during the
first hour after turn-en
Within 430 Hz any 30 minute
period thereafter at constant
temperature
+1 10° or better (at normal
temperatures}
49.99 kHz
More than 40 dB
600 2
More than 1.5 W across 8 2
{at 10% distortion)
NOTE:
The
circuit
and
ratings
may
change
without
notice
due
to
developments
in
technology.
AT-930 (Automatic Antenna Tuner)
Frequency
Range:
Amateur
bands
from
80~10m
input Impedance: 50 Q, unbalanced
Output
Impedance:
20~
150
2
unbalanced
insertion Loss: Less than 1 dB at 3.5 MHz
(at optimum match}
Through Power: 150 W max.
Motor Stop SWR Value: Less than 1.2

(oie
SECTION 2.
2.1 KENWOOD TS-930S
The
TS-930S
is
@
highly
sophisticated
alt-solid
state
transceiver
operating
on
all
Amateur
bands
between
1.8
and
29.7
MHz,
and
a
general
coverage
short
wave
receiver
covering
the
150
kHz
to
30
MHz
range.
The
TS-930S
in-
cludes
many
built-in
features
usually
found
as
extras
on
other
transceivers.
Inchided
are
VOX,
100
kHz
calibrator,
RIT,
RF
attenuator,
two
VFO's
and
two
effective
noise
blankers.
The
TS-930S
also
includes
automatic
gain
con-
tvol
(AGC),
automatic
level
controt
(ALC),
full:
and
semi-
break-in
CW
with
sidetone,
an
RF
speech
processor,
speaker,
built-in
AC
power
supply
and
an
optional
built-in
automatic
antenna
tuner.
Designed
for
operation
on
SSB,
AM,
FSK
or
CW,
the
TS-930S
delivers
more
than
250
watts
PEP
input.
Any
complicated
electronic
device
may
be
damaged
if
operated
incorrectly,
and
this
transceiver
is
no
exception.
Please
read
all
of
the
operating
instructions
before
putting
your
TS-930S
on
the
air.
2.2 FEATURES
+ 160-10 Meters,
Coverage Receiver
Covers
all
Amateur
frequencies
from
160-10
meters,
including
the
new
WARC,
30,
17,
and
12
meter
bands,
on
SSB,
CW,
FSK,
and
AM.
Features
an
excellent
150
kHz
—
30
MHz
generat
coverage
receiver.
Separate
Amateur
band
access
keys
allow
speedy
band
selection,
and
an
UP/DOWN
bandswitch
changes
in
1
MHz
steps.
A
new,
innovative,
quadrupte
conversion,
digital
PLL
synthesized
circuit
provides
superior
frequen-
cy
accuracy
and
stability,
plus
greatly
enhanced
selec-
tivity.
with 150 kHz — 30 MHz General
* Excellent Receiver Dynamic Range
The
use
of
dual
2SK125
J
FET’s
in
a
unique
parallel
RF
amplifier
circuit,
followed
by
two
2SK125's
each,
operated
push-pull,
in
the
1st
mixer,
buffer
amplifier,
and
2nd
mixer
circuits
results
in
outstanding
two-signal
characteristics
and
@
substantially
improved
noise
floor
tevel.
Typical
two-tone
dynamic
range
performance
for
the
receiver
section
is
100
dB
(20
meters,
500
Hz
CW
bandwidth
at
sensitivity
of
0.25
nv,
S/N
10
dB.),
with
an
overall
intercept
point
of
+10
dBm,
a
noise
floor
level
of
—140
dBm,
and
a
blocking
dynamic
tange
of
135
dB
(20
meter,
CW
bandwidth),
Dual
Mode
Noise
Blanker
(“Pulse’’
or
“Woodpecker’’)
NB-1,
with
threshold
control,
for
pulse-type
noise.
NB-2
for
longer
duration
“woodpecker”
type
noise.
INTRODUCTION
AND
FEATURES
SSB IF Slope Tuning
Allows independent adjustment of the low and/or high
frequency slopes of the iF passband, for best
interference rejection.
CW VBT and Pitch Controls
The CW VBT (Variable Bandwidth Tuning) contro! tunes
out interfering signals. The CW pitch contro! shifts the
IF
passband
and
simultaneously
changes,
both
the
received
beat
frequency
and
sidetone
pitch.
A
“Natrow/
Wide" filter selector switch is provided.
IF Notch Filter
100
kHz
tuneable
IF
notch
provides
2
deep,
sharp,
notch,
to
better
than
—40
d8.
SSB
slope
tuning,
CW
VBT,
or
pitch
controls
do
not
affect
the
notch
frequency.
Built-in Audio Filter
Tuneable, peak-type audio filter for CW. Peak center
frequency is approximately 800Hz, adjustable
+400 Hz.
All Solid State, 28 Volt Operated Final Amplifier
The
final
amplifier
operates
on
28
V
DC
for
the
lowest
possible
IM
distortion
(3rd
order
IMD
~37
dB,
typical).
Power
input
is
rated
at
250
W
PEP
on
SSB,
250
W
DC
on
CW
and
FSK,
and
80
W
DC
on
AM.
RF
Power
is
sup-
plied
by
two
Motorola
MRF-422
RF
power
transistors
(Pe=290
Wieach)
operating
push-pull.
Final
amplifier
protection
circuits,
cooling
fan,
and
an
SWR/Power
meter
are
built-in,
Automatic Antenna Tuner, Built-In
Available with the AT-930 Antenna tuner either built-in,
or as an option, which covers the 80-10 meter amateur
bands,
including
the
new
WARC
bands.
The
tuning
range
is
automatically
pre-set
AT
band
selection
to
minimize
tuning
time.
Impedance
matching
capability
is
20
to
150
chms,
unbalanced.
An
“AUTO-THRU’’
switch is provided on the front panel.
CW Full Break-In
The
CW
Full
Break-in
circuit
uses
CMOS
togic
plus
reed
telays
for
maximum
flexibility,
coupled
with
smooth,
quiet
operation.
Front
panel
switchable
to
semi-break-in,
RF Speech Processor
An
RF
clipper
provides
higher
average
“‘talk-power’’,
plus
improved
intelligibility.
Separate
“INPUT”
and
“OUTPUT”
front
panel
level
controls.
Dual Digitat VFO’s
10 Hz
step
dual
digital
VFO’s
include
the
band.
Mode
selector
for
split
frequency
or
cross-band
operation.
Each
VFO
continuously
tunes
the
full
receiver
range.
A

large, heavy, flywheel-type knob is used for ease of tun-
ing. The T.F. Set switch allows fast transmit frequency
setting for split-frequency operations. An A=B switch
is provided for equalizing one VFO frequency to the
other. A VFO ‘Lock’? switch is provided. The RIT
control allows +9.9 kHz receive frequency shift.
Automatic VFO Step change
Tuning faster than 5.5~6.5 revolutions/second
increases the tuning rate for easy OSY.
Eight Memory Channels
These store both frequency and band. VFO-MEMO
switch allows use of each memory as either an indepen-
dent VFO, (the originat memory frequency can be recall-
ed at will), or as a fixed frequency. Internal battery
memory back-up, estimated 1 year life. (Three “AA”
batteries not Kenwood supplied).
Fluorescent Tube Digital Display
Six digit fluorescent tube digital display has an analog
type sub-scale with 20 kHz increment markers. A
separate 2 digit display always indicates RIT frequency
shift, The display also indicates VFO “A” or “B™,
Memory channel operation, RIT “ON and VFO
“LOCK”.
AC Power Supply Bulltin
120, 220, or 240 V AC, switch selected. {operates on
AC only}. Separate automatic fan provided to force-cool
the power supply.
‘Other Features:
* SSB monitor circuit, 3 step RF attenuator, VOX, and
100 kHz marker
© 2.4 kHz SSB and 6 kHz AM filters built-in
* Display and meter dimmer switch
Optional Equipment:
* AT-930 Automatic antenna tuner
© SP-930 External speaker with selectable audio
filters
* YG-455C-1 (500 Hz) or YG-455CN-1 (250 Hz} plug-
in 456 kHz CW filters
* YK-88C-1 (500 Hz} CW and/or YK-BBA-1 {6 kHz)
AM plug-in 8.83 MHz filters
* MC-60A Deluxe desk microphone with PTT, PTT
lock, and UP/DOWN switches
© 71-922(A) The linear amplifier TL-922A. (without
10m band) is available only in U.S.A.
* SM-220 Station monitor for transmit, receive, and
trapazoid displays
© PCIA Hybrid phone patch
© HC-10 Digital World Clock
* HS-6, HS-5, (Deluxe through standard) headphones
HS-4,
IMPORTANT
The MC-60A has a built-in amplifier. When using the
microphone connected to the ¥S$-930S, be sure to
set the MC-60A MIC AMP switch to OUT.
With the MIC AMP switch set to IN, the microphone
output level exceeds the rated input level of the
TS-9305.

————
SECTION 3. INSTALLATION.
3.1 UNPACKING
Remove the TS-930S fram its shipping container and packing
materiat and examine it for visible damage. {f the equipment
has been damaged in shipment, notify the transportation
company immediately. Save the boxes and packing material
for future shipping.
The following accessories should be included with the
transceiver.
. Instruction Manual (B50-3959-20]
. Speaker Plug 1/8“ (E12-0001-05)
. 7 Pin DIN Plug {E07-0751-08) ...
. 8 Pin MIC Plug (E07-0852-05)...
. Fuse (6A) (FOS-6021-05) or
{4A) (FO5-4022-05) ..
. Power cable
Arona
o
3.2 OPERATING PRECAUTIONS: READ
BEFORE OPERATING
It is suggested you read this instruction manual carefully
before attempting operation with your new TS-930S, and
that you follow the suggested operating procedures.
Especially note that the final amplifier power transistors
might be damaged during transmission if the transceiver is
operated into an improper load.
Observe the following transmitter precautions:
1. If the buitt-in antenna tuner is used, operate only after
automatic tuning is completed, tuning must be perform-
ed with the MODE switch at the TUNE position.
2. Use only a resonant, 50 2 antenna which is adjusted for
an SWR of 1.5 or less.
3. DO NOT transmit without an Antenna or Dummy Load.
3.3 OPERATING LOCATION
As with any solid state electronic equipment, the TS-930S
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. Atso,
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 fans to keep the transceiver cool.
CAUTION:
Do not operate the radio in an RF Field greater than 6 V RF
Receiver damage may occur.
3.4 CABLING (See Figure 3-2.}
i@ 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. Use ground
rods or metal cold water feedline,
NOTE:
‘A ground connection greater than 1/4 away from the
transceiver may be a good OC ground, but NOT an AF Ground,
i ANTENNA
Connect through a 50 ohm antenna feedtine to the coaxiat
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, the VOX is
off, and the line voltage is correct. Then connect the power
cord to the line source.
@ AC POWER
For fixed station operation, the TS-930S is supplied to
operate from a 120V AC, 220 VAC or 240 VAC 50/
60 Hz pqwer source capable of supplying 510 watts or
more.
For units shipped to the U.S.A., the switch is set at
120 with a 6-ampere fuse installed.
For units shipped to the European, Central and South
American, and African countries, the switch is set at
220 with a 4-ampere fuse installed.
For units shipped to the Oceanian countries, the
switch is set at 240 with a 4-ampere fuse installed.
For AC 220-240 yore
Fig. 3-18 Fuse replacement

3.5 MICROPHONE
Attach the microphone connector
microphone, as shown
circuit, as shown in Figure 3-2A.
in Figure 3-2. Be sure: the
microphone PTT switch is separate from the microphone
Note that a microphone using a common ground terminal
should not be used, to prevent ground loops and unwanted
switching noise.
The microphone input is designed for 5002 ~ 50k?
microphones. Normally, use it at 600Q. The choice of
microphone is important for good speech quality, and
to a suitable
Headphones
Micron!
Miciuphane
wioonnane
P|
=
Trarotorme t ~ é
£ swine
fe} not this
Monitor scope
SM-220
Can be used
Antenna
‘Microphone
———————
fither
@
low
or
high
impedance
microphone {500 2-50 kQ) can be
: Used, The E-LT. switch should be
isolated from the mic circuit {shown
in “A‘}), Use a microphone with a
separate switch and MIC fine so both
P.5.T. and VOX are available.
{8}
and TX monitor
:
Use headphone of 4 to 162 im-
} pedance. The optional HS-4, HS-5 or
HS-6 headphones are best suited for
use with the TS-930S. Stereo-tyoe
headphones can also be used.
View from cord side
oe
x} Tsea0¢
‘Microphone . Microphone connector
= 1
External speaker
Besides the builtin Key ie
spesker, an external For CW operation, con
speaker can also be —_-nect yourkey to the KEY
jack. Use shielded cable.
Open terminal voltage is
approx, 10 VDC
(>.
thet
used. Connect to the
rear EXT SP jack using
the suppliod plug.
for RX
cf
To other To t
RCVR
Earth
It is recommended that a ground lead
be connected to tho rear panel GND
termina to prevent the possibility of
electric shock. TVI and BCI. Use as
short and heavy a lead as possibte.
GND terminal
ransverter To tinear
amplifier
Use the supplied power cable
Fig. 3-2 CONNECTION

should be given serious consideration. The crystal lattice
filters in the transceiver provides all the restriction
necessary 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 instsuctions for
connecting 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 bridging 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 may
not function properly. In this case, insert in the mike line an
attenuator as shown in Fig. 3-2C. A typical MIC gain
control setting is 12 o'clock. If you must rim this control at
9 o'clock or less, use an attenuator.
3.6 KEY
If CW operation is desired, connect a key to the KEY jack.
Use shielded cable, and a standard {mono or 2P) phone
plug.
3.7 EXTERNAL SPEAKER AND HEADPHONES
Receive audio output from the TS-930S is 1.5 watts at 4
to 16 ohms. The TS-930S has a built-in the speaker, plus
an external speaker jack on the reat panel. The speaker
may be an 8-ohm permanent-magnet type, 4 inches or
larger. The internal speaker is disconnected when an exter-
nal speaker is used. Headphones should also be 4 to 16
ohms impedance. When the headphones are connected to
the front-panel PHONES jack, the speaker is disabled.
3.8 GROUND
To prevent electric shock, and reduce the possibility of TVE
and BCI, connect the transceiver to a goad earth ground
through as short and heavy a lead as possible.
3.9 ANTENNA
Any of the common antenna systems designed for use on
the high frequency amateur bands may be used with the
TS-930S, provided the input impedance of the transmis-
sion line is not outside the capability of the AT-930
Automatic Antenna Tuner pi-output matching network.
The transmission line should be coaxial cable. An antenna
system which shows a standing wave ratio of less than
1.5:1 when using 50 ohm coaxial transmission line, or a
system that results in a transmission line input impedance
that is essentially resistive, and between 20 and 150 ohms
will take power from the transceiver through the AT-930.
If open wire or balanced type transmission fine is used with
the antenna, a suitable antenna tuner with balun is recom-
mended between the transceiver and the feed line.
Methods of construction and operating such tuners are
described in detail in the ARRL Antenna Handbook, or
similar publications. For operation-on the 160, 75 and 40
meter bands, a simple dipale antenna, cut to resonance in
the most used portion af the band, will perform satisfac-
torily. For operation 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 sophisticated transceiver is useless without a good
antenna.
CAUTION:
Protect your Equipment ~ Use a LIGHTING ARRESTOR

SECTION 4. CONTROLS AND THEIR FUNCTIONS |
3) (19 Gp iD 0
Mo ogao
FRONT PANEL
@ Meter
— AP @ METER switch (1
5p @ MIC (rnicrophone gain) conteot (T)
© @ CAR (cartier level) controt (T}
@ Frequency display
® Tooing knob
20 G BAND switch
49, @ 1 Miz step switch
“) @ D. LOCK switch
8B VEO A indicator
@ VFO 8 indicator
BY @ MEMO Imemory} indicator
@ RIT indicator (A)
@® ON AIR indicator (T}
(3 ANT TUNE (antenna-tuned indicator (T)
NOTCH indicator {R}
FUNCTION switch
A=B switch
TE-SET switch
VFO/MEMO (memory) selector
MEMORY CH selector
MIN (memory write} ewiteh
MR (memory recall) switch
NB 1 (noise blanker 1) switch (RI
NB LEVEL control (Ft
NB 2 (noise blanker 2) switch (A)
RIT switch {RI
RIT contrat {Rl
RIT-CLEAR switch (A)
NOTCH switch (Ft
NOTCH contro! {R}
AF TUNE switch (RD
AF TUNE contra! (R}
VOX switch (T}
CW break-in selector (TF
VOX GAIN contro! {T}
ANTI VOX conteol (T)
DELAY contro! (7)
@® PROC Iprocessor} switch (T}
HD @ PROCESSOR-N (input level) control (T)
| @ PROCESSOR-OUT (output level} control {T}
@ POWER ewiteh
— @ Mow (moniton switch (77
, @ DIM (dimmer switch
@ Standby switch
) @ Auto Antenna Tuner switch {TI
~ @) NAR/WIDE filter bandwidth selector {R
2B @ AGC switch (Rt
BOSSQLOOSVOISHSSSSIIIQSOS
55 @ PHONES (headphones! jack (Ri
@ MIC (microphone) connector (8 Pin} (7)
18 & MODE switch
@ RF ATT (RF attenuator switch (RY
AF (AF gain! contra! (R)
RF (RF gain) control (R)
CW VAT contro! (R}
SSB SLOPE TUNE control (R}
6D DIAL LOCK switch
@ PITCH control (F}
CAL (marker) switch (R)
Battery (memory backup) compartment
@ ANTENNA CONNECTOR
@ GND (ground terminal)
@ RX. ANT output switch
@ RX. ANT termine!
@ X. VERTER {transverten terminal
@ REMOTE CONNECTOR
@ IF OUT jack (RE
@ PHONE PATCH jacks
@ ATTY KEY jack (T}
(® Power connector
@ AC FUSE
@Q EXT. SP Ispeaker! jack (RI
@® CW. KEY jack (7)
@ Cooling fan (final section}
9 Cooling fan (power supply]

4.1 FRONT AND TOP PANELS
The symbol after the part name indicates:
R: Active only during feception
T: Active only during transmission
No symbot: Always active
(METER]
is —— =
Sees
pee i te \ inn aa
z
a
@
@ Meter
The meter monitors seven different functions, depending
on the METER switch position. In receive the meter is
automatically an S-meter, and shows received signal
strength on a scale of O ta 60 dB over 59. In transmit,
meter function depends on the position of the METER
switch, as described below. This is an average-responding
meter, NOT peak-reading.
@ > METER switch (T)
This determines the transmit meter function:
+ comp:
This indicates compression level when the speech pro-
cessor is operating. Do not exceed 10 dB compression.
* ALC {Automatic Level Controj}:
Monitors internal ALC voltage, or the ALC voltage feed-
back from a linear amplifier operated in conjunction with
the TS-930S. 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.
In FSK or when the processor is operating, adjust ALC
with the PROCESSOR OUT control (41).
* POWER:
Indicates transmitter RF output power.
* SWR:
Indicates voltage standing wave ratio (VSWR).
«ic:
Indicates the power transistor collector current {IC).
Since the IC meter is adjusted to the values in the prox-
imity of the current value which is usually used, its in-
dication may not be correct when a weak current suth
as the idfing current is applied.
* ve:
Indicates the power transistor collector voltage (VC).
@ MIC {microphone gain) control (T)
This control adjusts microphone amplifier gain for SSB
operation. Adjust for an on-scale ALC reading on voice
peaks. For low-power operation, adjust this control below
the ALC range. ¥
@® CAR (carrer level} contro! (7)
This controls cartier level during CW operation. Adjust the
carrier level for an on-scale ALC meter reading. For low-
power operation, adjust this control below the ALC range.
[OKSPLAY) 3 60 oO) h rE]
© Frequency display
This custom two color gas display tube independently in-
dicates: Operating frequency to the 100 Hz place, and RIT
frequency, up to +/— 9.9 kHz offset. An analog-type dial
displays in 20 kHz steps.
By mode, the display indicates;
TUNE: Zero-beat frequency
CW, USB, LSB: Transmit cartier frequency.
AM: Filter center frequency.
FSK: Space frequency.
© Main Tuning knob
This flywheel-weight knob controls the dual digital VFO's,
which operate in 10 Hz step at 10 kHz/turn for normal
slow tuning. When the knob is spun fast, the tuning rate
automatically increases for fast OSY.
@ _ BAND switch
This selects one of the 10 HF amateur radio bands bet-
ween 1.9 MHz and 29.7 MHz. The 1 MHz step switches
(8) alow raising or lowering frequency in 1 MHz steps from
150 kHz to 29.9 MHz. WWV may be tuned at 5, 10, 15,
or 20 MHz.
Note:
As supplied, reception only is possible on the 10, 18, and
24.6 MHz bands.

1 Miz step switches
These
raise
or
tower
frequency
in
1
MHz
steps
within
the
transceivers
full
frequency
range.
Depress
UP
to
raise
fre-
quency
and
DOWN
to
lower
frequency.
@ DIAL LOCK indicator
This
fights
when
DIAL
LOCK
switch
(57)
is
on.
@ VFO A indicator
This
lights
when
VFO
A
is
operating.
@ VFO B indicator
This
tights
when
VFO
B
is
operating.
@ MEMO (memory) indicator
This
lights
to
indicate
operation
on
a
fixed
memory
channet
frequency
when
the
VFO/MEMO
switch
(20)
is
depressed
to
MEMO.
@ RIT indicator (R)
This
lights
when
the
RIT
switch
(27)
is
on.
@®_ON AIR indicator (T)
This
lights
during
transmission
mode.
}
@
ANT
TUNE
(antenna
tuner)
indicator
(T}
|
This
indicates
Auto
Antenna
Tuner
operation
and
lights
on-
|
'y
when
the
Auto
Antenna
Tuner
switch
(46)
is
at
AUTO,
|
the
mode
switch
is
in
Tune,
carrier
is
inserted
in
transmit
made
and
the
motors
are
running.
‘
I} @® NOTCH indicator (R)
|
This
indicates
the
notch
filter
is
operating
and
lights
when
the
NOTCH
switch
(30}
is
on.
LVFO operation
@ FUNCTION switch
This
selects
seceive
and
transmit
frequencies.
Select
posi-
tion A or B for normat operation.
° AR:
VFO
A
operates
during
reception
and
VFO
B
during
transmission.
eae:
VEO
A
operates,
VFO
B
stands
by.
* B:
VFO
B
operates,
VFO
A
starids
by.
* BR:
VFO
B
operates
during
reception
and
VFO
A
duting
‘transmission,
@ A=B ewitch
Depress
this
switch
to
equalize
the
frequéncy
of
the
idle
VEO
to
that
of
the
operating
VFO.
@ TF-SET switch
Deprass
this
switch
to
“SPOT”,
or
momentarily
inter-
change
reception
frequency
with
transmission
frequency.
Frequency
“SPOTTING”
is
possible
only
in
receive
and
is
ineffective
during
transmission.
(MEMORY)
@® VEO/MEMO (memory) switch
This
selects
either
VFO
or
MEMO
{memory}.
At
MEMO,
the
MEMO (memory) indicator {12} lights.
@) MEMORY CH selector
This
selects
one
of
the
eight
memory
channels,
To
write
in
a
frequency
depress
the
Min
switch
and
the
displayed
fre-
quency
will
store
in
the
selected
channel.
To
recall
from
a
memory
channel,
select
the
channel
and
depress
the
MR
switch.

@ Min (memory write} switch
‘Use this to memorize a frequency into a selected channel.
@ MR (memory recall) switch
Use this switch to recall a memorized frequency.
INOISE BLANKERSI
Pi
SREY rene arrine
@ NB 1 (noise blanker 1) switch (R)
The noise blanker suppresses impulse noises such as
automotive ignition noise, and permits otherwise
unreadable weak signals to be received. The NB LEVEL
control'{25) varies the operating level of the noise blanker.
@) NB LEVEL contro! (R)
This sets the noise blanker operating level. Use only the
minimum level necessary, according to operating condi-
tions and noises. Excessive N.B. level will cause distortion
of clipping.
@ NB 2 (noise blanker 2} switch (R)
Tum on NB 2 if “woodpecker” radar pulse noise is the
source of interference. Note that when NB 2 operates,
signal blanking time is longer than during NB 1 operation.
The blanking “‘hole’” will be apparent on the signal. This is
not a symptom of trouble. The NB 2 switch actually
operates both NB 1 and NB 2 simultaneously. It is recom-
mended that you tum this switch OFF when there is no
“woodpecker” noise.
Biciegas
@ AIT switch (A)
This controis the Receiver Incremental Tuning (RIT) circuit.
When this switch is on, the RIT indicator (13) lights.
@ RIT control {R)
This permits independently varying the receive from the
transmit frequency, up to +/—9.9 kHz, when the RIT is
on. The RIT frequency is independently displayed to the
100 Hz order.
@ RIT-CLEAR switch (RI
This resets the RIT frequency to zero offset.
[NOTCH filter]
@® NOTCH switch (R)
This switch controls the NOTCH circuit and indicator.
@) NOTCH contro! (R}
Turn the NOTCH switch ON to activate the Notch filter.
Adjust the notch frequency to null beat (carrier interfer-
ence) signals,
13

(AF TUNE}
@ AF TUNE switch (R)
During CW reception, this circuit provides a tuneable, peak-
ed AF response. Undesirable signals will be attenuated,
while the desired CW signal will be peaked. The AF TUNE
control (33) adjusts the peak frequency.
AF TUNE control (R)
With the AF tune switch (32) ON, adjusts this for the
desired AF peak response.
[VOX & SPEECH PROCESSOR)
@) VOX switch (T)
Turn this switch on to activate the VOX {Voice Operated
Xmit) during SSB operation or break-in during CW opera-
tion.
@ CW break-in selector (T)
During CW operation, this selects either full break-in
{receives between keyed characters) at FULL, or semi
break-in {holds transmitter on for preset delay by Delay
control {38)} at SEMI,
@ VOX GAIN (T)
This controls sensitivity of the VOX (Voice Operated
Transmit} circuit. Adjust the gain for consistent key-over
by voice, but not back ground noise.
@ ANTI VOX control (1)
During VOX operation, the VOX may be operated by sound
from the transceiver's speaker. Use just enough antivox to
prevent speaker sound from tripping the VOX. ANT! VOX
does not operate when headphones are plugged in on the
front panel,
@® DELAY control (T}
This controts hold time for SSB VOX, or CW semi-break-in
operation. Adjust to hold the transmitter on between
words, at a normal rate of speech, or keying speed.
@ PROC (SPEECH PROCESSOR} SWITCH (T)
This switch is used during SSB operation. Set the switch to
the ON position and the speech processor will be activated,
increasing average “talk power’’. Compression level can
be adjusted by the processor controls.
@ PROCESSOR. {input fevell control (T)
This control adjusts compression fevel. Set the meter
switch (2) to the COMP position and adjust this control
white observing the meter COMP scale. It is suggested that
10 dB or less compression be used. Use the MONITOR, or
an oscilloscope, when adjusting the compression level.
@ PROCESSOR-OUT (output levell control {T}
This varies the speech processor output level. Adjust for an
. on-scale ALC reading at voice peaks.

[OTHER CONTROLS]
@ MAIN POWER switch
Controls all power to the transceiver. Before operating the
POWER switch, confirm that the VOX (34) is off, and the
standby switch (45) is set to the reception mode.
@ MON} (MONITOR) SWITCH (T}
This delivers a sample of the demodulated transmit {F
signal to the AF circuit for monitoring modulation during
SSB operation.
@ DIM (dimmer) switch
For operator convenience, this switch selects either bright
or dim intensity of both the digital display, and meter
illumination,
@ STAND-8Y SWITCH (TI
This two-position level switch selects:
* REC:
The transceiver is receiving unless the microphone PTT
switch, or the VOX circuit is activated.
* SEND:
Locks the unit in transmit.
Transmission is focked out (reception only) if the
selected transmission frequency is outside the amateur
radio bands, or the final stage thermal-protects {is deac-
tivated due to excessive heat-sink temperature}.
@ Auto Antenna Tuner switch (1)
* AUTO:
The Auto Antenna Tuner wilt operate during transmis-
sion in the tune mode, with carrier inserted.
© THRU:
The Auto Antenna Tuner is deactivated and bypassed
during transmission.
When the AUTO mode is selected and the ANT TUNE in-
dicator (15} is lit, the two variable capacitor drive
motors are operating. Wait until the indicator goes off
before switching to an operating mode.
@ NARMIDE filter selector (RY
This switches the IF bandwidth to narrow from the normat
wide position. (Narrow filters are optional.) This switch
does not operate in SSB made.
@ acc switch ir)
This controls the AGC (Automatic Gain Control circuit:
= OFF:
AGC disabled (no AGC}.
« FAST:
Normally used for CW and FSK operation.
* SLOW:
Normally used for SSB and AM operation.
@ PHONES JACK (R)
The headphones jack allows use of a 4 to 16 ohm head-
phone through a 1/4” phone plug. When phones are used
the speaker and antivox are disabled.
MIC (microphone) connector (8 Pins} (T}
Microphone audio input. Frequency UP/DOWN control and
PTT
fines
are
included.
The
optional
MC-60A
is
recom-
mended.
Pin
assignments
of
the
MIC
connector
are
shown
below.
Note: —e
When
operating
the
microphone,
be
sure
that
the
MC-60A
MIC
AMP
switch
is
set
to
OUT.
ZA
a a
si { Lo
| FRONT VIEW
—e conn
ester

@ MODE switcH
The mode switch selects type of emission, and TUNE.
* TUNE:
Always use this position to make antenna tuning and in-
itial linear amplifier tune-up adjustments. input power to
the final amplifiers is reduced approximately 50% to
protect the final power transistors from possible
damage during adjustments. The key circuit is locked-on
and the key is disabled.
* CW:
Select this position for CW operation. If a key is
connected it must be closed to obtain transmitter out-
put.
* USB:
Used for upper-sideband operation. International
Amateur practice dictates the use of USB on and above
the 10 MHz band.
* LSB:
Selects lower-sideband. International Amateur practice
dicates the use of LSB on and belaw the 7 MHz band.
° FSK:
RTTY operation is available with a terminal unit and
teletypewriter.
* AM:
Select this position for AM operation.
%
RF ATT {RF attenuator) switch {R)
This switch permits insertion of 10, 20, or 30 dB attenu-
ator in the receiver antenna circuit, to protect the RF
amplifier and mixer from excessive input signal distortion.
@ AF GAIN (R)
This adjusts receiver audio level. Volume increases
clockwise.
@ RF GAIN (R}
This adjusts receiver RF amplifier gain. Turn fully clockwise
for maximum gain and @ correct S-meter reading.
@ CW VST CONTROL (RI
The CW VBT (Variable Bandwidth Tuning) continuously ad-
justs the IF Filter bandwidth to eliminate radio interference.
For normal operation, this control may be left fully
clockwise (NORMAL Position). If a narrow fitter is selected
in either the CW, TUNE, FSK, or AM made, the rate of
bandwidth change is reduced for a vernier effect. Normally
the control may remain fully clockwise. Without an op-
tional filter, the circuit is effective only when WIDE is
selected during CW, TUNE, or FSK, or when NAR is
selected during AM operation.
6} SSB SLOPE TUNE control (R}
This permits independently varying the upper and lower IE
bandwidths. High and low audio frequencies may be
simultaneously cut {tuned}. Optimum IF bandwidth may be
selected according to interference conditions. This circuit
operates only in the SSB mode.
@_ D. (DIAL) LOCK switch
This push button electrically locks the frequency of the
working VFO. When this switch is on, the tuned frequency
does not vary when either the tuning knob or BAND switch
is operated. This is convenient when operating on the same
frequency for extended periods, The RIT does operate with
the D. LOCK switch on. The D. LOCK indicator (9) tights to
show operation.
69 CW PITCH control
This permits control of pitch during CW reception. During
transmission, this control simultaneously adjusts CW side
tone frequency to match that of the received signal.
@ CAL (marker) switch (RI
In the ON position, receive frequency can be calibrated at
100 kHz intervals using the built-in oscillator. The marker
is also used when calibrating the internal master reference
oscillator. See Figure 8-3 for location and calibration
instruction.
@ Battery compartment
Three AA type manganese or alkaline dry cells may be in-
stalled for memory backup. Service life of the cells is about
one year, if the transceiver is to be stored, it is recommend-
ed that the dry cells be removed.

4.2
REAR
PANEL
ie
(@) ANTENNA CONNECTOR
This
SO-239
coax
connector
should
be
attached
to
a
suitable
50
9
antenna
for
transmitting
and
receiving.
@® GND (ground) terminal
To
prevent
electric
shock,
as
well
as
RFI
and
BCI,
connect
the transceiver to a good earth ground.
@® RX. ANT output switch
When
using
the
RX.
ANT
terminal
to
feed
another
receiver,
place
this
switch
to
the
OUT
position.
The
TS-930S's
feceiver
antenna
input
will
be
disconnected.
@® RX. ANT terminal
Terminal
to
connect
an
external
receiver.
Signal
from
the
antenna
in
use
with
the
TS-930S
will
be
output
only
during
reception
to
the
external
receiver.
© XVERTER (transverter) terminal
This 8 Pin DIN connector is used to interface a VHF or UHF
transverter.
PIN
FUNCTION
|
PIN
FUNCTION
Ground
|
5
|
Transverter
input
(RX)
Relay contrat (+0n
2
|
transerit)
&:
‘Transvertet ALC input
3
|
Ground
7
|
Transverter
output
{7X}
4
|
X.verter
ON-OFF
controt
6
|
HF
ANT
output
Table
4-1
XVRTR
Terminal
Pin-OUTS
a fy < i
AY
mY
AX ARG
uy
DOR Koha
} ‘ Ay
:)
1
i
@&
Fim WO ANE
Aelay Cott -
(112
oN
ean,
A
0
al
AF IN PUT
5 From transvertor
To
Transvertar
(RECEIVE)
ON-OFF Sw
Feam Transverter ALC
|
Fig.
4-1
TS-930S
XVATR
Internal
Wiring
@ REMOTE CONNECTOR
This
connector
is
used
to
interconnect
a
linear
amplifier
or
other
accessory
item.
See
page
32
for
details.
Use
the
7
Pin
DIN
plug
provided
for
connection.
@® WF OUT jack (R)
A
high-level,
narrow-bandwidth
100
kHz
IF
output,
taken
before
the
receiver
produce
detector,
for
scope
display
of
the
received
signal
waveform
(to
feed
an
SM-220,
verticle
input).
PHONE PATCH jacks
Use
the
IN
terminal
for
transmitting
a
6002
low
im-
pedance
line
or
audio
input
(phone
patch
SSTV,
AFSK,
or
other
input).
The
OUT
terminal
provides
600
£
fine
output
for
phone
patch,
SSTV,
AFSK
or
other
application.
17
en

@® RITY KEY jack (1
Jack for FSK operation. Connect this directly to the low
voltage (5 V DC or tess) terminal unit output using an RCA
plug. DO NOT connect @ 60 MA locatloop direct: use a
keying relay to provide a switched ground.
@ Power connector
Connector for AC power source. Make certain the
transceiver’s voltage selector is adjusted to your local fine
voltage BEFORE turn-on.
@ Ac FUSE
This fuse protects the power supply against short circuits.
Never use a higher amperage fuse than specified; it will
eventually cause extensive damage. !f the fuse blows, try
to determine the cause before replacing. For 120 volt
operation, use a 6 ampere fuse. For 220/240 volt, use a 4
ampere fuse.
@® EXT. SP (speaker) jack (R)
The
receiver
audio
output
can
be
connected
through
this
jack
to
an
external
4
to
16
ohm
speaker.
The
internal
speaker
is
disconnected
when
an
external
speaker
is
con-
nected.
@® cw. KEY jack (T}
Using
shielded
line,
connect
a
key
to
this
1/4”
phone
jack
for
CW
operation.
Key
open-terminal
voltage
is
approx-
imately
10
V
DC.
@ Cooling fan (final section}
Electronic-controlled
automatic
cooling
fan
for
the
final
amplifier
section.
@ Cooling fan {power supply)
Electronic-controlied
automatic
cooling
fan
for
the
power
supply section.

SECTION 5. OPERATION ]
5.1 Reception (I}
The numbers in parenthesis refer to switch and control
assignments as listed in the preceding chapter.
NOTE:.
Set the MIC and CAR controts to minimum to prevent accidental
transmission before tune-up. The TS-930S must be operated into
a 50 ohm antenna or dummy load with an SWR less than 2:1.
Random tength wire antennas or light-bulb dummy toads should
not be used. Conventional half-wave dipoles and beam antennas
should be used only at or neat’ their resonant frequency. Ex-
ceeding an SWR of 1.5:1- can damage the output stags of the
transceiver.
{1} Basic Procedures for Receive Operation’
The TS-9305 has many advanced features such as CW,
VBT, SSB slope tuning, NOTCH, ete. to assure enhanced
receive operation. For the use of these specialized controls
and switches, refer to Section 5.2 Reception {I)’’.
With a suitable antenna and microphone or key connected
to the transceiver, set the controls as described.
UNITIAL SETTING]
]
Controls Reception
| POWER switch OFF
VOX switch OFF
MONI switch OFF
STAND-BY switch REC
| SSB reception sLow
CW reception FAST
MODE Selected reception mode
MEMO switch VFO
a | FUNCTION A
§ [RF ATT 0 dB
2 [RIT OFF
€ | NOTCH OFF
AF TUNE OFF
D.LOCK OFF
AF control Tum fully counterclockwise
RF controt Tum fully clockwise
SSB slope tune High © Turn fully
clockwise
Low Tum fully
counterclockwise
gt 4
& & | RX ANT switch OFF
Table 5-1
». Tum the POWER switch (42) on. The meter and
frequency display group will light , indicating the
18-9308 is operating.
b. Select 4 band with the BAND switch (7) or 1 MHz step
switches (8).
© Advance the AF gain control {53) clockwise untit Some
receiver noise or signal is heard from thé speaker.
d. Adjust the main tunitig withiri the frequency range of
the selected Amateuf barid until a signal ig heard. Tune
the signal for clearest reception.
(2) WWV Reception
Set the band switch to “10” and turn the tuning con-
troi to 10.0 MHz. °°
5.2 RECEPTION (11)
This section covers operation of controls and switches to
provide maximum performance from the TS-9308.
1sORF ATT switch
A strong adjacent signal tay conceal a desired weak
signal, or the S meter may deflect off-scale when the
receiver is tuned to a local strong signal. The input to the
RF amplifier may be attenuated by 10, 20 or 30 dB using
the RF ATT switch. This will reduce or eliminate in-
terference and distortion from excessively strong signals.
2 RF GAIN CONTROL
RF GAIN is controlled by changing the AGC threshold
voltage. Adjust the RF GAIN so the S-meter does not
deflect excessively. This also reduces noise during recep-
tion. For normal operation, this control should be turned
fully clockwise for maximum sensitivity.
| Meximum “5 metor reading of
| an incoming signal.
Poiria: doticetian with AF
Signals
weeker
gain
control
adjusted
than
this
level
counterclockwise.
are
attenuated.
°)
|
clockwise
Fig. 5-1 RF GAIN Control Operation
3 AGC {AUTOMATIC GAIN CONTROL}
Set the AGC switch to the appropriate position: Generally
for SSB and AM, SLOW, for CW and FSK FAST, and for
very weak signals, the AGC may be turned OFF.

Simultaneous Use of the RF GAIN CONTROL and AGC
Switch
If a strong signat (such as a local station) appears in the
vicinity of the intended receive signal, the S. meter may
show unusual deflection due to the AGC voltage developed
from the strong disturbing signal. !f this occurs, turn the RF
GAIN down so the meter pointer remains at about the
original deflection peak and turn the AGC switch OFF. This
will eliminate the unwanted AGC: voltage and permit clear
reception.
4 RIT :
First, cancel any previously programmed offset using the
Clear key {29}, then turn the RIF switch ON.
The RIT control allows shifting the’ réceive | frequency
9.9 kHz, displayed to the 100 Hz place, without chang-
ing the transmit frequency.
With the RIT switch ON, the. RIT indicator will light, and
receive frequency can be adjusted by using the RIT control.
NOTE
When the RIT is ON, transmit frequency is different from the
receive frequency. For normal operation, leave the RIT switch
OFF. ft should be turned ON only when needed.
To reset the RIT, depress the RIT-CLEAR switch. «:
5 SSB SLOPE TUNE control
During SSB reception, this permits shifting the apparent IF
bandwidth to reject interference. fi
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* SSB SLOPE TUNE HIGH CUT control:
Adjust the HIGH CUT control counterclockwise, and in-
terference of higher frequency than the desired signal
will be rejected. In the resulting AF signal, the high-
frequency components are cut.
* SSB SLOPE TUNE LOW CUT control:
Turn the LOW CUT contro! clockwise and interference
of lower frequency than thé desired signal will be re-
jected. in the resulting AF signal, the low-frequency
components are cut. Maximum bandwidth occurs at
jow cut full counterclockwise, and high cut full
clockwise.
6 CW VBT {Variable Bandwidth Tuning) control
This contro} is used to eliminate radio interference by
changing the IF passband-width. Use this control in con-
junction with the NOTCH filter to obtain optimum results.
AGS-KHe filter
— 8.84-MHz fitter
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Fig. 5-3 CW VBT control
By setting the CW VBT controf to the NORMAL position,
maximum passband-width is obtained. The IF filter
passband-width is narrowed as the contro! is adjusted
counterclockwise, while center frequency remains un-
changed. Fig. 5-3 illustrates: operation, The range of
variability depends on the type of optional fitter used.
{i} When the filter bandwidth is 2.4 kHz (without an op-
tional filter), the passband-width varies within the
range of 2.4 kHz to 600 Hz.
{i} With an optional YK-88C-1 filter (8.83 MHz, 500 Hz
bandwidth) or YG-455C-1 fitter {455 kHz, 500 Hz