Kenwood TS-930S User manual

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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:
NOTE: lf disregarded, inconvenience only — no
damage or personal injury.
CAUTION: Equipment damage may occur, but not per-
NOTE:
This
manual
covers
the
TS-930S
with
the
AT-930
Automatic
antenna
tuner
installed.
if
your
transceiver
does
not
contain
the
AT-930,
please
disregard
any
mention
of
Automatic
antenna
tuner
operation.
CAUTION:
Read
Operating
Manual
Section
5
before
placing
transmit-
ter in service.
CONTENTS
sonal injury.
SECTION 1. SPECIFICATIONS ................000..00000. 3
SECTION 2. INTRODUCTION AND FEATURES ............ 5
SECTION 3. INSTALLATION ..............000.0.000: ee 7
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 (1)
(1) Basic Procedures for Receive Operation
(2) WWYV Reception
5.2 Reception (I)
(1) RF ATT Switch
(2) RF Gain Control
(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)
5.3 Transmission (I)
5.4 Transmission (I)
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 Filter 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 .......... 35
8.1 Preparation
8.2 Adjustments
8.3. Maintenance
8.4 Transmitting WARC bands
SECTION 9. TROUBLESHOOTING ........00......000.. 37
SECTION 10. INTERNAL VIEWS............0.000000000 ee 38
SECTION 11. BLOCK DIAGRAM .................. Besienandeed 39
SECTION 12. SCHEMATIC DIAGRAM ......................... 40

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SECTION 1. SPECIFICATIONS
Tannen abo ergy:
{GENERAL} {RECEIVER}
Transmitter Frequency : : Circuitry: Quadruple conversion
Range: 160 m Band 1.8 ~ 2.0 MHz Intermediate Frequencies: 1st IF: 44.93 MHz
80 m Band 3.5~4.0 MHz 2nd IF: 8.83 MHz
40 m Band 7.0~7.3 MHz 3rd IF: 455 kHz
30m Band 10.1~10.15'MHz : 4th IF: 100 kHz
(10.0 MHz WWV) Sensitivity
20
m
Band
14.0~
14.35
MHz
(at
10
dB
S+N/N)
bags?
ees.
:
17 m Band 150 - 500 kHz: Less than 1 »V for SSB, CW
Receiver Frequency
Range:
Mode:
Antenna Impedance:
With AT-930
antenna tuner
Power Requirement:
Power Dissipation:
Dimensions:
Weight:
[TRANSMITTER]
Final Power Input:
Carrier Suppression:
Unwanted Sideband
Suppression:
Harmonic Content:
Audio Frequency
Response:
Modulation:
FSK Shift:
Modulation Distortion:
FSK Shift:
Modulation Distortion:
Microphone Impedance:
ALC input:
Linear Amplifier
Switching:
18.068 ~ 18.168 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(14-3/4"\W x 141
(5-9/16”)H x 350(13-13/16”)D
mm (inches)
With antenna tuner:
Approx. 18.5 kg (40.8 Ibs)
Without antenna tuner:
Approx. 16.8 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 dB
SSB: Balanced modulation
AM: Low level modulation
(IF stage)
170 Hz
Less than —31 dB
170 Hz
Less than —31 dB
500 ohms ~ 50 kohms
-—10 V DC MAX
200 V DC MAX
100 mA
500 kHz - 1.8 MHz:
1.8 - 30 MHz:
Image Ratio:
IF Rejection:
Selectivity :
and FSK:
Less than 10 uV for AM ©
Less than 4 «V for SSB, CW
and FSK
Less than.32 nV for AM ..
Less than 0.25 zV for SSB,
CW and FSK
Less than 2 »V for AM
More than 80 dB
(1.8 MHz~30 MHz)
More than 70 dB
(1.8 MHz~ 30 MHz)
(W-wide, N-narrow filter
selection)
SSB, CW(W), FSK(W),
AMIN):
CWIN), FSK(N):
AM(W):
SSB Slope Tune:
CW VBT
CW(W), FSK(W)
AMIN):
CWI(N), FSK{N):
AM(W):
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 dB
Without optional filter:
6 kHz/—6 aB,
18 kHz/—60 dB
With optional YK-88A-1:
6 kHz/—6 GB,
11 kHz/—60 dB
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
CWi(W), FSK(W)
With optional YK-88C-1 and
YG-455C-1 installed:
150 Hz~500 Hz —6 dB
With optional YK-88A-1:
4 kHz~6 kHz/—6 dB

Frequency Stability:
Frequency Accuracy:
RIT Variable Range:
Notch Filter Attenuation:
Phone Patch Output 2:
Audio Output Power:
Within +200 Hz during the
first hour after turn-on
Within +30 Hz any 30 minute
period thereafter at constant
temperature
+ 1x 10°5 or better (at normal
temperatures)
+9.99 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

Steet,
2.1 KENWOOD TS-930S
The TS-930S is a highly sophisticated all-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. Included are VOX, 100 kHz calibrator,
RIT, RF attenuator, two VFO’s and two effective noise
blankers. The TS-930S also includes automatic gain con-
trol (AGC), automatic level control (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, with 150 kHz — 30 MHz General
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 general coverage receiver.
Separate Amateur band access keys allow speedy band
selection, and an UP/DOWN bandswitch changes in
1 MHz steps. A new, innovative, quadruple conversion,
digital PLL synthesized circuit provides superior frequen-
cy accuracy and stability, plus greatly enhanced selec-
tivity.
* 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 a substantially improved noise floor
level. Typical two-tone dynamic range performance for
the receiver section is 100 dB (20 meters, 500 Hz CW
bandwidth at sensitivity of 0.25 wv, S/N 10 dB.), with
an overall intercept point of +10 dBm, a noise floor
level of —140 dBm, and a blocking dynamic range 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.
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SECTION
2.
INTRODUCTION
AND
FEATURES
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SSB IF Slope Tuning . ; ,
Allows independent adjustment of the iow and/or Paigh
frequency slopes of the .IF passband, for best
interference rejection.
CW VBT and Pitch Controls |
The CW VBT (Variable Bandwidth Tuning) control tunes
out interfering signals. The CW ‘pitch control: shifts the
IF passband and simultaneously changes, both the
received beat frequency and sidetone pitch. A ‘‘Narrow/
Wide’’ filter selector switch is provided.
IF Notch Filter
100 kHz tuneable IF notch ipioviees a ae sharp,
notch, to better than —40 dB. SSB slope tuning, CW
VBT, or pitch controls do not affect the notch. frequency.
Built-in Audio Filter _
Tuneable, peak-type audio filter is 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
(Pc= 290 W/each) 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 ohms, unbalanced. An ‘’AUTO-THRU’’
switch is provided on the front panel.
CW Full Break-In
The CW Full Break-in circuit uses CMOS logic plus reed
relays 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
““OQUTPUT’’ front panel level controls.
Dual Digital 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
5

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 QSY.
Eight Memory Channels
These store both frequency and band. VFO-MEMO
switch allows use of each memory as either an indepen-
dent VFO, (the original 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 Built-in
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
e 2.4 kHz SSB and 6 kHz AM filters built-in
¢ Display and meter dimmer switch
Optional Equipment:
e AT-930 Automatic antenna tuner
e SP-930 External speaker with selectable audio
filters ,
¢ YG-455C-1 (500 Hz) or YG-455CN-1 (250 Hz) plug-
in 455 kHz CW filters
* YK-88C-1 (500 Hz) CW and/or YK-88A-1 (6 kHz)
AM plug-in 8.83 MHz filters
° MC-60A Deiuxe desk microphone with PTT, PTT
lock, and UP/DOWN switches
© TL-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
© PC-1A 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 TS-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-930S.

SECTION 3.
get taeetn ev oetg daa,
3.1 UNPACKING
Remove the TS-930S 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.
The following accessories should be included with the _
transceiver.
1. Instruction Manual (B50-3959-20) ........esees 4
2. Speaker Plug 1/8” (E12-0001-05) ........eseeeeee 1
3. 7 Pin DIN Plug (EO7-0751-05) .........ccccseeeseeseees 1:
4. Fuse (6A) (FO5-6021-05) or
(4A) (FO5-4022-05) ....ccsccscseccecesseeeseesnees 1
5. Power Cable ........ccccncncececccecnscesceecceceseaseneeesse 1
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 built-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 © 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. 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 fans to keep the transceiver cool.
CAUTION:
Do not operate the radio in an RF Field ie than 6 V PF.
Receiver damage may occur. ;
3.4 CABLING (See Figure 3-2.)
m@ GROUND
To prevent electric shock, and reduce the possibility of TV!
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.
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A
ground
connection
greater
than
4/4
away
‘from
the
transceiver
may
be
a
good
DC
ground,
but
NOT
an
RF.
Ground.
|
M ANTENNA.
Connect
through
a
50
ohm
antenna
feedline
to
the
coaidal
connector on the rear panel.
M@ KEY
lf
CW
operation
is
desired,
connect
t
a
key
to
the
KEY
jack.
Use
shielded:
line
or
coaxial
cable.
POWER CONNECTIONS ee
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.
H AC POWER
For fixed station operation, the TS-930S is supplied to
operate from a 120 V AC, 220 VAC or 240 VAC 50/
60 Hz power 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.
BOTTOM view
Set to your
line voltage
. For AC 120 volts
ee
Ces,
For AC 220~240 volts —
Fig. 3-1B Fuse replacement _

3.5 MICROPHONE
Attach the microphone connector to a_ suitable
microphone, as shown in Figure 3-2. Be sure the
microphone PTT switch is separate from the microphone
circuit, as shown in Figure 3-2A.
Either a
Transformer
9V(10 mA) 5
Microphone [) €3| E oe
(a) this fo) Switch GND (MIC) @
Transformer
Microphone ) e 3 g § Switch
(b) not this
Microphone ) e-3|
Transformer
‘ Switch
{c) not this
Monitor scope
Antenna SM-220
Can be used for RX
and TX monitor
Lightning
arrester
Le
To other To transverter To linear
GND terminat Earth RCVR amplifier
It is recornmended that a ground lead
be connected to the rear pane! GND
terminal to prevent the possibility of
electric shock. TVI and BCI. Use as
short and heavy a lead as possible.
low or high impedance
microphone (500 2~50 kQ) 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
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 5000. The choice of
microphone is important for good speech quality, and
Headphones
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-type
headphones can also be used.
‘@ STBY
a MIC
'® GNO (STBY)
x TS-930S
° Microphone connector
Extemal speaker
Besides the built-in Key
For CW operation, con-
nect your key to the KEY
jack. Use shielded cable.
Open termina! voitage is
approx. 10 VDC
speaker, an external
speaker. can also be
used. Connect to the
RTTY Closed “@ar EXT SP jack using
circuit loop the supplied plug.
EXT.SP* \Cw.KEY:
Use the supplied power cable
Fig. 3-2 CONNECTION

should be given serious consideration. The crystal lattice
filter 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 instructions 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 run this control at
9 o'clock or less, use an attenuator.
3.6 KEY
lf 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 rear 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 TVI
and BCI, connect the transceiver to a good 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 line is used with
the antenna, a suitable aritenna 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 dipole antenna, cut to resonance in
the most used portion of 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.

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SECTION 4. CONTROLS AND THEIR FUNCTIONS
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FRONT PANEL
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ee
@ METER switch (T)
@ @) MIC (microphone gain) control (T)
@ CAR {carrier level) control (T)
@ ) Frequency display
®© Tuning knob
@ @ BAND switch
@ 1 MHz step switch
@
D. LOCK switch
4 @® VFO A indicator
@) VFO B indicator
Cr) @} MEMO (memory) indicator
@ RIT indicator (R)
@ ON AIR indicator (T)
@) ANT TUNE (antenna-tuner) indicator (T)
NOTCH indicator (R)
FUNCTION switch
A=B switch
TF-SET switch
VFO/MEMO (memory) selector
MEMORY CH selector
MIN (memory write) switch
MR (memory recall) switch
NB 1 (noise blanker 1) switch (R)
NB LEVEL contro} (R)
NB 2 (noise blanker 2) switch (R)
RIT switch (R)
RIT control (R)
RIT-CLEAR switch (R)
NOTCH switch (R)
NOTCH control (R)
AF TUNE switch (R)
AF TUNE controi {R)
VOX switch {T)
CW break-in selector (T)
VOX GAIN control {T)
ANTI VOX control (T)
DELAY control (T)
PROC (processor) switch (T)
@) PROCESSOR-IN (input level) control (T)
@) PROCESSOR-OUT (output level) control (T)
@ POWER switch
68) @ MONI (monitor) switch (T)
@®) @ DIM (dimmer) switch
@) Standby switch
@ Auto Antenna Tuner switch (T)
@ NAR/WIDE filter bandwidth selector (R)
@ AGC switch (R)
® @ PHONES (headphones) jack (R)
6 MIC (microphone) connector (8 Pin) (T)
6) MODE switch
62 RF ATT (RF attenuator) switch (R)
AF {AF gain) contro! (R)
RF (RF gain) control (R)
CW VBT control (R)
SSB SLOPE TUNE control (R)
6?) DIAL LOCK switch
68 PITCH contro} (R)
69 CAL (marker) switch (R)
€0 Battery (memory backup) compartment
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@ ANTENNA CONNECTOR
@) GND (ground terminal)
@ RX. ANT output switch
@ RX. ANT terminal
@ X. VERTER (transverter) terminal
@ REMOTE CONNECTOR
@ IF OUT jack (R)
PHONE PATCH jacks
@ RTTY KEY jack (T)
@ Power connector
@) AC FUSE
@2 EXT. SP (speaker) jack (R)
q3 CW. KEY jack (T)
@ Cooling fan (final section)
@§ Cooling fan (power supply)
10

4.1 FRONT AND TOP PANELS
The symbol after the part name indicates:
R: Active only during reception
T: Active only during transmission
No symbol: Always active
[METER]
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@) 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 to 60 dB over SQ. 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 Control):
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).
e 1C:
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 such
as the idling current is applied.
ve:
Indicates the power transistor collector voltage (VC).
@ MIC (microphone gain) control (T)
This contro! 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 (carrier level) control (T)
This controls carrier 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.
[DISPLAY] ®©® @®@ ® @ ®
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10
@) 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 carrier 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 QSY.
@ 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) allow 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
24.5 MHz bands.
11

1 MHz step switches
These raise or lower 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 lights when DIAL LOCK switch (57) is on.
VFO A indicator
This lights when VFO A is operating.
@ VFO B indicator
This lights when VFO B is operating.
@ MEMO (memory) indicator
This lights to indicate operation on a fixed memory channel
frequency when the VFO/MEMO switch (20) is depressed
to MEMO.
(3 RIT indicator (R)
This lights when the RIT switch (27) is on.
(ON AIR indicator (T)
This lights during transmission mode.
(3) ANT TUNE (antenna tuner) indicator (T)
This indicates Auto Antenna Tuner operation and lights on-
ly when the Auto Antenna Tuner switch (46) is at AUTO,
the mode switch is in Tune, carrier is inserted in transmit
mode and the motors are running.
NOTCH indicator (R)
This indicates the notch filter is operating and lights when
the NOTCH switch (30) is on.
[VFO operation]
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A=B VFO/MEMO Mu
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12
() FUNCTION switch
This selects receive and transmit frequencies. Select posi-
tion A or B for-normal operation.
© AR:
VFO A operates during reception and VFO B during
transmission.
° A:
VFO A operates, VFO B stands by.
e B:
VFO B operates, VFO A stands by.
e B-R:
VFO B operates during reception and VFO A during
transmission.
@ A=B switch
Depress this switch to equalize the frequency of the idle
VFO to that of the operating VFO.
TF-SET switch
Depress 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]
FUNCTION " "MEMORY CH
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@) VFO/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.

@2 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.
[NOISE BLANKERS]
SUNCTION MEMORY CH
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@) 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 control (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
or clipping.
@@ NB 2 {noise blanker 2) switch (R)
Turn 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 turn this switch OFF when there is no
“*woodpecker’’ noise.
{RIT]
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A=S VFO/MEMO Min Lid
FUNCTION MEMORY CH Li
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@ RIT switch (R)
This controls 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 (R)
This resets the RIT frequency to zero offset.
[NOTCH filter]
AS VFO/MEMO Mm ma
FUNCTION MEMORY CH
@0 NOTCH switch (R)
This switch controls the NOTCH circuit and indicator.
61) NOTCH control (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]
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@2 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.
@3) AF TUNE control (R)
With
the
AF
tune
switch
(32)
ON,
adjusts
this
for
the
desired AF peak response.
(VOX & SPEECH PROCESSOR]
@ @ ®
REC THRU OFF WIDE
PHONES
PROCESSOR
tN-@-OUT MIC-©-CaR
VOX switch (T)
Turn
this
switch
on
to
activate
the
VOX
(Voice
Operated
Xmit)
during
SSB
operation
or
break-in
during
CW
opera-
tion.
@3)
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.
@8 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.
62) ANTI VOX control (T)
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.
ANTI
VOX
does
not
operate
when
headphones
are
plugged
in
on
the
front
panel.
DELAY control (T)
This
controls
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-IN
(input
Jevel)
control
{T)
This
control
adjusts
compression
level.
Set
the
meter
switch
(2)
to
the
COMP
position
and
adjust
this
control
while
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
level)
control
(T)
This
varies
the
speech
processor
output
level.
Adjust
for
an
on-scale
ALC
reading
at
voice
peaks.

[OTHER CONTROLS}
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PROCESSOR Lilels)
IN-@-OUT MIC-®-Can ope
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@ 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.
@ MONI (MONITOR) SWITCH (T)
This delivers a sample of the demodulated transmit IF
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-BY SWITCH (T)
This two-position level switch selects:
© REC:
The transceiver is receiving unless the microphone PTT
switch, or the VOX circuit is activated.
e SEND:
Locks the unit in transmit.
Transmission is locked 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 (T)
e AUTO:
The. Auto Antenna Tuner will 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.
@ NAR/WIDE filter selector (R)
This switches the IF bandwidth to narrow from the normal
wide position. (Narrow filters are optional.) This switch
does not operate in SSB mode.
@ AGC SWITCH (R)
This controls the AGC (Automatic Gain Control) circuit:
e 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 piug. When phones are used
the speaker and antivox are disabled.
6 MIC (microphone) connector (8 Pins) (T)
Microphone audio input. Frequency UP/DOWN control and
PTT lines are included. The optional MC-60A is recom-
mended. Pin assignments of the MIC connector are shown
below.
Note: ——____—_____$______________
When operating the microphone, be sure that the MC-60A
MIC AMP switch is set to OUT.
9 Viapprox. ©
10 mA
GND (MIC) @ ® MIC
® GND (STBY)
FRONT VIEW
15

6) 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.
e LSB:
Selects lower-sideband. International Amateur practice
dicates the use of LSB on and below the 7 MHz band.
° FSK:
RTTY operation is available with a terminal unit and
teletypewriter.
° AM:
Select this position for AM operation.
—
FUNGTIO
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~y
62 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.
63 AF GAIN (R)
This. adjusts receiver audio level. Volume increases
clockwise.
16
64 RF GAIN (R)
This adjusts receiver RF amplifier gain. Turn fully clockwise
for maximum gain and a correct S-meter reading.
6} CW VBT CONTROL {R)
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 filter is selected
in either the CW, TUNE, FSK, or AM mode, 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.
SSB SLOPE TUNE control (R)
This permits independently varying the upper and lower IF
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.
62 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) lights to
show operation.
68 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 (R)
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
@KENWooS
HF TRANSCEIVER
@ re-o2ce S
WITH aUTOManS
ANTENNA TUNER UNIT
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@ ANTENNA CONNECTOR
This SO-239 coax connector should be attached to a
suitable 50 2 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
receiver antenna input will be disconnected.
@ RX. ANT terminal
Terminal to connect an external receiver. Signal from the
antenna in use with the TS-9308S 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.
= FUNCTION & FUNCTION
Ground Transverter input (RX)
Relay contro! (+on
transmit) Transverter ALC input
Ground Transverter output (TX)
X-verter ON-OFF control HF ANT output
Table 4-1 XVRTR Terminal Pin-OUTS
From RX ANT
Relay Control
(+12 V ON transmit, MAX 50 mA)
RF IN PUT
A vii Transverter
To Transverter (RECEIVE)
ON-OFF SW
From Transverter ALC
Fig. 4-1 TS-930S XVRTR 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.
@ IF 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, verticie
input).
PHONE PATCH jacks
Use the IN terminal for {ranemitiing- a 6002 low im-
pedance line or audio input (phone patch SSTV, AFSK, or
other input). The OUT terminal provides 600 0 line: output
for phone patch, SSTV, AFSK or other application.
17

@ RTTY KEY jack (T)
Jack for FSK operation. Connect this directly to the low
voltage (5 V DC or less) terminal unit output using an RCA
plug. DO NOT connect a 60 MA local-loop 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 line
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. If 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.
18
@2 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-controlled automatic cooling fan for the power
supply section.

Me
PO
5.1 Reception (I)
The numbers in parenthesis refer to switch and control
assignments as listed in the preceding chapter.
NOTE: _——————_ —___ ic“ qx“—
Set the MIC and CAR controls to minimum to prevent accidental
transmission before tune-up. The TS-930S must be operated into
a-50-ohm antenna or dummy foad with an SWR less than 2:1.
Random length wire antennas or light-bulb dummy loads should
not be used. Conventional half-wave dipoles and beam antennas
should be used only at or near their resonant frequency. Ex-
ceeding an SWR of 1.5:1 can damage the output stage of the
transceiver.
(1) Basic Procedures for Receive Operation
The TS-930S has many advanced features such as CW,
VBT, SSB slope tuning, NOTCH, etc. 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.
[INITIAL SETTING]
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
FUNCTION A
RF ATT 0 dB
RIT OFF
NOTCH OFF
AF TUNE OFF
D. LOCK OFF
AF control Turn fully counterclockwise
RF control Turn fully clockwise
_| SSB siope tune High
@
c
g
Qa
wy
i=
°
=
irs
Turn fully
clockwise
Low Turn fully
RX ANT switch OFF
Table 5-1
counterclockwise
a. Turn the POWER switch (42) on. The meter and
frequency display group will light , indicating the
TS-930S is operating.
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b. Select a band with the BAND switch (7) or 1 MHz step
switches (8).
c. Advance the AF gain control (53) clockwise until some
receiver noise or signal is heard from the speaker.
d. Adjust the main tuning within the frequency range of
the selected Amateur band until a signal is heard. Tune
the signal for clearest reception.
(2) WWV Reception
Set the band switch to ‘‘10’' and turn the tuning con-
trol to 10.0 MHz.
5.2 RECEPTION (I)
This section covers operation of controls and switches to
provide maximum performance from the TS-930S.
1 RF ATT switch .
A strong adjacent signal may 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.
Maximum ‘’S‘’ meter reading of
an incoming signal.
AF RF
GAIN~®~ GAIN
6
as)
Full
clockwise
position
AF RF
GAIN—® GaN
6
Cay
10
Turn
counter
clockwise
Fig. 5-1 RF GAIN Contro! Operation
: Pointer deflection with RF
Signals weaker gain control adjusted
than this level counterclockwise.
are attenuated. 7] +
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.
19

Simultaneous Use of the RF GAIN CONTROL and AGC
Switch
If a strong signal (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. If 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 RIT switch ON.
The RIT control allows shifting the receive 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. It should be turned ON only when needed.
To reset the RIT, depress the RIT-CLEAR switch.
§ SSB SLOPE TUNE control
During SSB reception, this permits shifting the apparent IF
bandwidth to reject interference.
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Fig. 5-2 SSB SLOPE TUNE (HIGH CUT, LSB) control
20
¢ 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.
e SSB SLOPE TUNE LOW CUT control:
Turn the LOW CUT control clockwise and interference
of lower frequency than the desired signal will be re-
jected. in the resulting AF signal, the low-frequency
components are cut. Maximum bandwidth occurs at
low cut full counterclockwise, and high cut full
clockwise.
6 CW VBT (Variable Bandwidth Tuning) control
This control 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.
455-kHz filter
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CW VBT CW VBT
NARROW NORMAL NARROW NORMAL.
Fig. 5-3 CW VBT control
By setting the CW VBT control to the NORMAL position,
maximum passband-width is obtained. The IF filter
passband-width is narrowed as the control is adjusted
counterclockwise, while center frequency remains un-
changed. Fig. 5-3 illustrates operation. The range of
variability depends on the type of optional filter 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
filter
(455
kHz,
500
Hz