Kenwood TS-830S User manual

GOO/ANAD
HF TRANSCEIVER
TS-8305
INSTRUCTION MANUAL
KENWOOD CORPORATION
C’PRINTED IN JAPAN B50-8048-30(K, M, T, W)
89/121110987654321 88/12111098

AFTER UNPACKING
It is advisable to save all original packing cartons (inner and
outer) to protect your valuable transceiver from damage
should you wish to transport it for remote operation or ship it
for after-sales service.
The following explicit definitions apply in this manual. Be
sure to read these definitions:
WARNING: Personal injury may occur — do not
disregard.
CAUTION:
Read Operating Manual Section 4. before placing
transmitter in service.
WARNING:
HIGH VOLTAGES PRESENT.
CONTENTS
NOTE: If disregarded, inconvenience only no
damage or personal injury.
CAUTION: Equipment damage may occur, but not
personal injury.
SPECIFICATIONS... ae 9
SECTION 1. INTRODUCTION AND FEATURES.... 4
SECTION 2. INSTALLATION.
2.1. Unpacking
2.2 Operating Location
2.3. Cabling
2.4 Microphone
2.5 Key
2.6 External Speaker and Headphones
2.7. Ground
2.8 Antenna
SECTION 3. CONTROLS AND THEIR FUNCTIONS 8
3.1 Front Panel
3.2 Rear Panel
SECTION 4. OPERATION...
4.1 Reception (I)
(1) Basic Procedures for Receive Operation
(2) WWV Reception
4.2 Reception (II)
(1) RF ATT Switch
(2) RF Gain Control
(3) AGC (Automatic Gain Control)
(4) RIT/XIT
(5) VBT Control (Variable Bandwidth Tuning)
(6) IF Shift
(7) VBT and IF Shift Combination
(8) Notch Control
(9) Noise Blanker (NB)
(10) Tone Control
. 14
4.3 Transmission (I)
(1) SSB Operation
4.4 Transmission (II)
(1) Speech Processor
(2) VOX (Voice Operated Transmit) Operation
(3) XIT (Transmitter Incremental Tuning)
(4) Monitor
(5) CW Operation
4.5 Fixed Channel Operation
4.6 Digital Display Calibration
4.7. Analog Dial Calibration
SECTION 5. OPTIONAL ACCESSORIES
5.1. Optional Accessories
5.2 Installation of Accessories
SECTION 6. MAINTENANCE AND ALIGNMENT .. 26
6.1 General
6.2 Service Position
6.3. Receiver Adjustments
6.4 Transmitter Adjustments
6.5 Transmitting on WARC BANDS
6.6 Analog Dial Adjustment
6.7. Operation On 220 or 240V AC
6.8 Ordering Spare Parts
6.9 Service
TROUBLESHOOTING
BLOCK DIAGRAM....
SCHEMATIC DIAGRAM
INTERNAL VIEW

TS-830
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[GENERAL]
Frequency Range
Power Requirement
Power Consumption
Dimensions
[TRANSMITTER]
*Final Power Input
Audio Input Impedance
RF Output Impedance...
Frequency Stability
Carrier Suppression
Sideband Suppression..
Spurious Radiation.
Harmonic Radiation ..
Audio Freq. Response ..
3rd Order Intermodulation Distortion.
ALC Input
Linear Amp Relay Contact Rating ...
[RECEIVER]
Receiver Sensitivity
Image Ratio
IF Rejection
Receiver Selectivity
SSB/CW WIDE..
CW NARROW ...
Variable Bandwidth
SSB with 2.4 kHz filter
CW with 500 Hz filter
Notch-filter Attenuation ....
Audio Output Impedance ..
Audio Output ..
S SPECIFICATIONS
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160m Band 1.8 ~ 2.0MHz
80m Band 3.5 ~ 4.0MHz
40m Band 7.0 ~ 7.3MHz
* 30 m Band 10.1 ~ 10.15 MHz
(10.0 MHz WWV)
20 m Band 14.0 ~ 14.35 MHz
* 17 m Band 18.068 ~ 18.168 MHz
15 m Band 21.0 ~ 21.45 MHz
* 12 m Band 24.89 ~ 24.99 MHz
10 m Band 28.0 ~ 29.7 MHz
.. SSB/CW
. 120V AC (220V, 240V modifiable), 50/60 Hz
Transmit: 295 watts
Receive: 32 watts (with heaters off)’
.. 333 (13.3) x 133 (5.3) x 333 (13.3) mm (inch)
. 13.5 kg (29.8 Ibs)
220W PEP for SSB operation
180W DC for CW operation
5002 ~ 50 kQ
.. 502 ~ 750
. Within 1 kHz during the first hour after 1 minute of warmup.
Within 100 Hz during any 30 minute period after warmup.
Better than 40 dB
. Better than 60 dB
Better than 60 dB
Better than 40 dB
400 to 2,600 Hz, within —6 dB
... Better than —36 dB
.. —10V DC MAX
. 100V DC 1A
... 0.25 nV at 10 dB S+N/N
.. Better than 60 dB
Better than 80 dB
.. 2.4 kHz (—6 dB), 3.6 kHz (—60 dB)
. With YK-88C (option)
500 Hz (—6 dB), 1.5 kHz (—60 dB)
270 Hz (—6 dB), 1.1 kHz (—60 dB)
500 Hz (—6 dB), 820 Hz (—60 dB)
250 Hz (—6 dB), 500 Hz (—60 dB)
With YK-88CN (option)
With YG-455C (option)
With YG-455CN (option)
500 Hz ~ 2.4 kHz (—6 dB) continuously variable
500 Hz ~ 150 Hz(—6 dB) continuously variable
With optional filter YK-88C and YG-455C added.
.... Better than 40 dB
-8~ 162
. 1,5W (8Q)
*Will transmit on the new 30, 17, and 12 meter bands. Diodes installed for preventing accidental
transmission before government amateur authorization.
NOTE: The circuit and ratings may change without notice due to developments in technology.

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1.1 KENWOOD TS-830S
The TS-830S is a highly sophisticated solid state Amateur
band transceiver employing only three vacuum tubes.
Operating on all Amateur bands between 1.8 and 29.7 MHz,
this unit is constructed modularly. The TS-830S includes
many built-in features usually found as extras on other
transceivers. Included are VOX, 25 kHz calibrator, RIT, RF
attenuator, and an effective noise blanker. The TS-830S
also includes automatic gain control (AGC), automatic level
control (ALC), semi-break-in CW with sidetone, a speech
processor, speaker and built-in AC power supply.
Designed for operation on SSB or CW, the TS-830S delivers
more than 220 watts PEP input.
Any complicated electronic device will be damaged if
operated incorrectly, and this transceiver is no exception.
Please read all of the operating instructions before putting
your TS-830S on the air.
1.2 FEATURES
1. Interference-free DX operation
* Variable bandwidth IF filter circuit (VBT)
The built-in VBT (Variable Bandwidth Tuning) circuit al-
lows IF filter pass-bandwidth to be varied as you wish to
eliminate unpleasant interference. It is adjustable
independent of the IF Shift.
*IF shift circuit
The IF SHIFT (also called pass-band tuning) is a circuit
to shift IF pass-bandwidth without changing receive
frequency. It eliminates interference or adjusts receive
frequency characteristic as desired.
* High reliability 455 kHz notch circuit
Interference, is also eliminated by the built-in notch
circuit. The TS-830S uses 455 kHz notch-frequency.
The notch circuit shifts the BFO frequency and the
local mixer frequency at the same time, thereby equiva-
lently changing the notch frequency. Thus, accurate
notch characteristic is realized even when the notch
point is changed, completely eliminating nearby inter-
ference signals.
* NARROW/WIDE BANDWIDTH selection and optional
filters for enhanced CW operation:
NARROW or WIDE CW operation can be selected when
using the following optional filters:
YK-88C (500 Hz), YK-88CN (270 Hz),
YG-455C (500 Hz), YG-455CN (250 Hz)
*Variable tone control circuit.
2. WARC bands
The TS-830S fully covers 160-10 m Amateur bands,
including the new WARC bands of 10, 18 and 24.5
MHz.
The TS-830S VFO covers more than 50 kHz above and
below each 500 kHz band. The optional VFO-230
external digital VFO covers about 100 kHz above and
below each band, for MARS and other applications.
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INTRODUCTION AND FEATURES i
3. Self-contained, compact AC Power supply.
4. Advanced circuit design for imporved two-signal char-
acteristics. Cleverly designed front-end circuit compo-
nents and receive circuit system assure excellent
two-signal characteristics. Cross-modulation and
blocking are reduced.
5. TX final unit uses 6146B’s
The finals are a pair of 6146B transmitting tubes. RF
negative feed back and amplified ALC provide clear,
strong signals with reduced cross modulation.
6. Variable level noise blanker
Conventional fixed level noise blankers are sometimes
less than effective in removing pulsating noise over
weak signals or rejecting strong interference signals.
This variable level noise blanker is equipped to control
the optimum threshold level of the gate pulse amplifier.
7. RF speech processor to increase average power during
SSB operation
This is an RF clipper speech processor, using both the
455 kHz and 8.83 MHz IF’s. Unwanted frequency
components are removed by the 8.83 MHz crystal filter,
providing a compression ratio of approximately 20 dB.
8. Transmit monitor circuit
The built-in monitor circuit permits easy adjustment of
the RF processor and mic gain.
9. XIT (Transmit Incremental Tuning) for fine adjustment
of transmit frequency independent of receive frequency.
10. A combination of precise, easy-to-read digital frequency
indicator and an analog dial.
The digital indicator has a Digital Hold memory
function.
11. The controls are arranged on the die-cast front panel for
easy operation.
12. A full variety of accessory circuits are provided:
The TS-830S includes:
VOX circuit (available for Semi-Break-in), Market circuit,
side-tone oscillator, selectable AGC (OFF, FAST,
SLOW), RF ATTENUATOR, Fixed crystal oscillator
circuit, Audio frequency characteristics selector circuit
for each mode, CW zero-beat circuit, IF OUT-1 (for
BS-8 Pan Display) and OUT-2 (for RX Display) for
SM-220 Station Monitor, HEATER switch, Screen Grid
switch, and a Built-in speaker.

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2.1 UNPACKING
Remove the TS-830S from its shipping container and
packing material and examine it for visible damage. If the
equipment has been damaged in shipment, notify the
transportation company immediately. Save the boxes and
packing material for future shipping or moving.
The following accessories should be included with the
tranceiver.
1. Instruction Manual (B50-2738-00) ...............0. 1
2. Plastic Extension Feet with Screws
(JO2-0049-1:4) wccvsssssucreuseresanivnnays
3. Speaker Plug 1/8” (E12-0001-05)
. 7P DIN Plug (E07-0751-05)
5. Fuse (6A) (FO5-6021-05)..........
= AN
2.2 OPERATING LOCATION
As with any solid state electronic equipment, the TS-830S
should be kept from extremes of heat and humidity.
Choose an operating location that is dry and cool, and avoid
operating the transceiver in direct sunlight. Also, allow at
least 3 inches clearance between the back of the equipment
to any object. This space allows an adequate air flow from
the ventilating fan to keep the transceiver cool.
SECTION 2. INSTALLATION
CAUTION:
Do not operate the radio in an RF Field greater than 6V RF.
Receiver damage may occur.
2.3 CABLING (See Figure 2-1.)
@ GROUND
To prevent electric shock, and reduce the possibility of TVI
and BCI, connect the transceiver to a good earth ground,
through as short 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 DC ground, but NOT an RF
Ground.
@ ANTENNA
Connect through a 50 ohm antenna feedline to the coaxial
connector on the rear panel.
@ KEY
If CW operation is desired, connect a key to the KEY jack.
Use shielded line or coaxial cable.
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@ POWER CONNECTIONS
Make sure the POWER switch on the front panel is turned
off, the stand-by switch is in the REC position, and the line
voltage is correct. Then connect the power cord to the line
source.
= AC POWER
For fixed station operation, the TS-830S is supplied to
operate from a 120V AC, 50/60 Hz power source capable of
supplying 280 watts or more.
2.4 MICROPHONE
Attach the microphone connector to a suitable microphone,
as shown in Figure 2-1. Be sure the microphone PTT switch
is separate from the microphone circuit, as shown in Figure
2-1A.
It should be noted that a microphone with a 3P plug using a
common ground terminal should not be used.
The microphone input is designed for 500~50 kQ
microphones. The choice of microphone is important for
good speech quality, and should be given serious considera-
tion. 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 im-
portant to have a microphone with a smooth, flat response
throughout the speech range.
Follow the microphone manufacturer's instructions for con-
necting the microphone cable to the plug. With many
microphones, the push-to-talk button must be pressed to
make microphone audio available. For VOX operation, this
unwanted feature may be eliminated, if desired, by opening
the microphone case and permanently connecting the
contacts which control the microphone audio.
Standard microphone sensitivity is within the range of —50
dB to —60 GB. If a microphone having a higher sensitivity
is used, the ALC and compressor circuits will not function
properly. In this case, insert in the mike line an attenuator as
shown in Fig. 2-1C. A typical MIC gain control setting is 12
o'clock. If you must run this control at 9 o'clock or less, use
an attenuator.
2.5 KEY
If CW operation is desired, connect a key to the KEY jack.
Use shielded cable, and a standard (mono or 2P) phone plug.

Headphones
Use headphones of 4 to 160
impedance. The optional HS-4, HS-5
headphone is best suited for use with
the TS-830S. Stereo-type headpho-
Microphone
Either a low or high impedance
microphone (50022 to 50 k®) 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.
nes can also be used.
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Microphone ) € 3] ;
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Transformer
Microphone |) © 3 g § Switch
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Microphone ° Microphone connector
Antenna
Key External speaker
1) Monitor scope
For CW operation, connect your key SM-220 Besides the built-in
to the KEY jack at the rear. Use Can be used for speaker, an external
shielded cable. RX monitor, pan speaker can also be used.
Lightning display, and TX Connect to the rear EXT
arrestor _ monitor. SP jack using the supplied
plug.
GND terminal
It is recommended that a ground
lead be connected to the GND ter-
minal at the rear of the set to prevent
the possibility of electric shock, TVI
and BCI. Use as short, and heavy a
lead as possible.
VFO-230
Linear amp
Power supply
Transverter
120V 50/60 Hz
External VFO
Fig. 2-1 TS-830S Connections

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

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NOTCH INDICATOR LED ®
VFO INDICATOR LED
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SECTION 3. CONTROLS AND TH
EIR FUCT
ION
Manto
FIX INDICATOR LED
RF ATT INDICATOR LED (R)
DH SWITCH:
ry
28 DIGITAL DISPLAY
ANALOG DIAL SCALE
METER
PROC SWITCH (T
COMP LEVEL CONTROL
NB SWITCH R)
NB LEVEL CONTROL ®)
AGC SWITCH R:
METER SWITCH
STAND-BY SWITCH
VOX GAIN ‘T
VOX DELAY (T)
PHONES JACK ®
MIC CONNECTOR ()
MODE SWITCH
MIC GAIN CONTROL ‘T)
CAR LEVEL CONTROL (T
FIX SWITCH
26) MAIN TUNING
2) LOAD CONTROL @
2 PLATE CONTROL (Tt)
4)
MONI SWITCH (7)
RF ATT SWITCH ®)
-———
2) DRIVE CONTROL
RIT/XIT LED
a) -RIT/XIT CONTROL
32, BAND SWITCH
3) + 0.5 SWITCH
(3) REGAIN ®
3) AF GAIN
3 POWER SWITCH
7) HEATER SWITCH
38 VBT CONTROL ®
39 TONE CONTROL ®
IF SHIFT CONTROL ®)
NOTCH CONTROL ‘R)
«@ NOTCH SWITCH ®
@ XIT SWITCH @®
i RIT SWITCH ®)
Fig. 3-1 Front Panel View

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

14. VOX GAIN @
This controls sensitivity of the VOX (Voice Operated
Transmit) circuit.
15. VOX DELAY CONTROL @®
The DELAY control adjusts the hold time for VOX or break-in
CW operation. Adjust for individual preference.
16. PHONES JACK ®
The headphones jack allows use of a 4 to 16 ohm
headphone through a 1/4” phone plug. When phones are
used the speaker is disconnected.
17. MIC CONNECTOR @
The four pin connector allows use of a microphone with PTT.
Figure 2-1 shows plug wiring.
18. MODE SWITCH
The mode switch selects type of emission, and TUNE.
TUNE........... This position provides reduced carrier and
shorted key line for transceiver tuning. (Input
power to the final section is reduced to
prevent tube damage during tune-up.)
Frequency is shifted approximately +800Hz
from the USB or CW receive frequency.
This is the actual CW transmit offset. This
feature allows you to Zero-Beat an incoming
CW signal.
Used for CW operation. A high-cut filter is
inserted in the receiver audio circuit to
reduce unwanted noise.
SSB filter selected for WIDE receive
bandwidth.
(NARROW) Used for CW operation with CW
filters YK-88C (500 Hz), YK-88CN (270 Hz),
YG-455C (500 Hz) or YG-455CN (250 Hz),
which are available as optional accessories.
Without an optional CW filter installed, the
pass-bandwidth is the same as in CW.W
CWIW csscvsanas
CWE Nesscccvness :
USB............. Used for upper-sideband operation. Inter-
national 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 below the 7 MHz band.
10
19. MIC GAIN CONTROL @
This control adjusts microphone amplifier gain for SSB
operation. Adjust for an on-scale ALC reading on voice
peaks
In the CAL ON position, receive frequency can be calibrated
at 25 kHz intervals using the built-in oscillator.
20. CAR LEVEL CONTROL @)
This controls carrier level during CW operation. Adjust for
approximately 250 mA of plate current.
21. FIX SWITCH
Place this switch ON for fixed channel operation:
(an optional crystal is required. Trio-Kenwood does not
supply these crystals.)
22. MONI (MONITOR) SWITCH @
This delivers a sample of the demodulated transmit IF signal
to the AF for monitoring modulation.
23. RF ATT SWITCH ®
With this switch ON, A 20 dB attenuator is inserted in the
antenna circuit, protecting the RF amplifier and mixer from
overload on strong input signals.
24. DIGITAL DISPLAY
The digital display indicates operating frequency to the
nearest 100 Hz.
25. ANALOG DIAL SCALE
The mono-scale permits direct analog frequency readout
over the O to 500 kHz range, graduated at 1-kHz intervals.
Operating frequency equals the dial (in kHz) plus the BAND
switch frequency (in MHz). An additional 50 kHz both
above and below the 500 kHz range is also covered.
26. MAIN TUNING
This
controls
the
VFO,
selecting
the
transceivers
operating
frequency.
The
indented
knob
is
convenient
for
quick
tu-
ning.
27. LOAD CONTROL @
This controls the loading of the network between the final
section and the antenna. Adjustment is described in Section
4.
28. PLATE CONTROL @
This
controls
the
plate
tuning
of
the
final
amplifiers.
Ca-
libration is approximate.