Chapter 4 Operating Basics; Switching Power On/Off; Adjusting Volume; Audio Frequency (Af) Gain - Kenwood TS-870S Instruction Manual

Intelligent digital enhanced communications system
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OPERATING BASICS

SWITCHING POWER ON/OFF

Switch ON the DC power supply, then press and hold
down [ ] (POWER) until "HELLO" appears on the
Display. Release [ ] (POWER) when you see "HELLO".
After the "HELLO" message, the frequency and
other indicators light. Pressing [ ] (POWER) too
long, switches the power OFF. If the TS-870S has
not been used for an extended period, "HELLO" may
not appear immediately.
To switch OFF the transceiver, press [ ] (POWER).
After the transceiver has been switched ON, it can
then be switched OFF or ON by using only the
power switch on the DC power supply.

ADJUSTING VOLUME

AUDIO FREQUENCY (AF) GAIN

Turn the AF gain control clockwise to increase the audio
level and counterclockwise to decrease the level.
AF
RF
4
6
<<<#6 (9L) >>>
8
2
0
1 0
The position of the
gain control does not affect the volume
Note:
AF
of "beeps" caused by pressing buttons nor the CW transmit sidetone.
Also, the audio level for Packet operation is independent of the
gain control setting.

RADIO FREQUENCY (RF) GAIN

Usually, set the RF gain control maximum clockwise. If
you are having trouble hearing the desired signal due to
excessive atmospheric noise or interference from other
stations, it may help to reduce the RF gain.
To do this, take note of the peak S-meter reading of the
desired signal, then turn the RF gain control
counterclockwise to match this peak reading with the
illuminated S-meter segments. Signals that are weaker
than the level set with the RF gain control will be
attenuated. Reception of the station is easier.
AF
RF
4
6
8
2
0
1 0
9
7
S
7
9
VOX
FULL
SEMI
AIP
AGC
AUTO
PROC
MONI
S
50
M.CH
ATT
PWR
FILTER
ANT
DOWN
UP
SWR
3
COMP
AUTO
LSB
USB
CW
R
FSK
FM
AM
VOX
FULL/SEMI
AIP
HF TRANSCEIVER
TS-870
ON AIR
AT TUNE
AT TUNE
THRU/AUTO
METER
PROC
MONI
1
CH 1
6
M.IN
AGC
KEY SPEED
PROC
MONI
ENTER
TF-SET
SEND
4
6
2
CH 2
7
M>VFO
2
8
3
CH 3
8
SCAN
PHONES
SLOW
FAST
OFF
0
1 0
4
CH 4
9
CLR
CAR
DELAY
MIC
PWR
MIC
4
6
4
6
5
REC
0
F.LOCK
QUICK MEMO
2
8
2
8
FINE
1MHz
0
1 0
0
1 0
M.IN
MR
DIGITAL SIGNAL PROCESSOR
AUTO
BEAT
FULL
SEMI
AIP
AGC
AUTO
PROC
MONI
MENU
SPLIT
TONE
NB
CTRL
A B
RIT
XIT
WIDTH
SHIFT
NOTCH
CANCEL
N.R.
TX EQ.
LO/WIDTH
FILTER
HI/SHIFT
AUTO
LSB
USB
CW
R
FSK
FM
AM
M. SCR
PRG
SCAN
F. LOCK
FINE
MHz
ON AIR
AT TUNE
RIT
XIT
CLEAR
NB
MODE
A=B
MENU
RIT/XIT
AF
RF
ENTER
TF-SET
LSB
4
6
/USB
RX
TX
A
2
8
CW/– R
B
0
1 0
FSK
M.CH/VFO.CH
NB
SQL
/– R
4
6
M.CH
2
8
FM/AM
FINE
1MHz
DOWN
UP
0
1 0
AF
DIGITAL SIGNAL PROCESSOR
AUTO
BEAT
FULL
SEMI
AIP
AGC
AUTO
PROC
MONI
MENU
SPLIT
TONE
NB
CTRL
A B
RIT
XIT
WIDTH
SHIFT
NOTCH
CANCEL
N.R.
TX EQ.
LO/WIDTH
FILTER
HI/SHIFT
AUTO
LSB
USB
CW
R
FSK
FM
AM
M. SCR
PRG
SCAN
F. LOCK
FINE
MHz
ON AIR
AT TUNE
RIT
XIT
CLEAR
NB
MODE
A=B
MENU
RIT/XIT
AF
RF
ENTER
TF-SET
LSB
4
6
/USB
RX
TX
A
2
8
CW/– R
B
0
1 0
FSK
M.CH/VFO.CH
NB
SQL
/– R
4
6
M.CH
2
8
FM/AM
FINE
1MHz
DOWN
UP
0
1 0
Furthermore, using a faster AGC setting {page 44} will
help eliminate the blocking affect of the large AGC
voltage that is developed due to a strong adjacent
station.
Depending on the type and gain of your antenna, and
the condition of the band, you may prefer leaving the
RF gain control turned counterclockwise by some
amount instead of turning it fully clockwise.

ADJUSTING SQUELCH

The purpose of squelch is to silence audio output from
the speaker when no signals are present. Setting the
squelch threshold too high causes the squelch to
remain closed while a weak signal is present. Setting
the threshold too low allows noise to be heard between
transmissions from other stations. Many operators
prefer leaving the squelch control fully counterclockwise
unless operating full-carrier modes such as FM or AM.
NB
SQL
4
6
8
2
0
1 0
Turn the SQL control to just eliminate the background
noise when no signal is present, or set and forget at full
counterclockwise rotation.

DUAL DIGITAL VFOs

The A and B VFOs function independently so that
different or the same frequencies can be selected by
each VFO. The following sections explain how to select
a VFO and how to copy frequency data from one VFO
to the other.

SELECTING VFOs ([RX A], [RX B])

Press [RX A] to select VFO A. Press [RX B] to select
VFO B.
RX
TX
A
B
1 Assume that you are presently using VFO A.
2 Press [RX B].
VFO B is selected and the frequency currently
selected by VFO B is displayed.
3 Press [RX A] to select VFO A again.
DIGITAL SIGNAL PROCESSOR
AUTO
BEAT
FULL
SEMI
AIP
AGC
AUTO
PROC
MONI
MENU
SPLIT
TONE
NB
CTRL
A B
RIT
XIT
WIDTH
SHIFT
NOTCH
CANCEL
N.R.
TX EQ.
LO/WIDTH
FILTER
HI/SHIFT
AUTO
LSB
USB
CW
R
FSK
FM
AM
M. SCR
PRG
SCAN
F. LOCK
FINE
MHz
ON AIR
AT TUNE
RIT
XIT
CLEAR
NB
MODE
A=B
MENU
RIT/XIT
AF
RF
ENTER
TF-SET
LSB
4
6
/USB
RX
TX
A
2
8
CW/– R
B
0
1 0
FSK
M.CH/VFO.CH
NB
SQL
/– R
4
6
M.CH
2
8
FM/AM
FINE
1MHz
DOWN
UP
0
1 0
DIGITAL SIGNAL PROCESSOR
AUTO
BEAT
FULL
SEMI
AIP
AGC
AUTO
PROC
MONI
MENU
SPLIT
TONE
NB
CTRL
A B
RIT
XIT
WIDTH
SHIFT
NOTCH
CANCEL
N.R.
TX EQ.
LO/WIDTH
FILTER
HI/SHIFT
AUTO
LSB
USB
CW
R
FSK
FM
AM
M. SCR
PRG
SCAN
F. LOCK
FINE
MHz
ON AIR
AT TUNE
RIT
XIT
CLEAR
NB
MODE
A=B
MENU
RIT/XIT
AF
RF
ENTER
TF-SET
LSB
4
6
/USB
RX
TX
A
2
8
CW/– R
B
0
1 0
FSK
M.CH/VFO.CH
NB
SQL
/– R
4
6
M.CH
2
8
FM/AM
FINE
1MHz
DOWN
UP
0
1 0
19

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