Kenwood TM-261A User Manual
144 MHz FM TRANSCEIVER
A TM-261A
m
o
144 MHz FM TRANSCEIVER
________
TM-261EJ
430/440 MHz FM TRANSCEIVER
TM-461A
INSTRUCTION MANUAL
KENWOOD CORPORATION
o
© B62-0605-00(K,M,C)
09 08 07 06 05 04 03 02 01 00
THANK YOU!
FEATURES
We are grateful you decided to purchase this KENWOOD
FM transceiver. This series of mobile transceivers were
developed to satisfy the requirement for a compact rig
that’s simple to operate yet has superior performance.
Users of this series will discover the transceiver’s Menu
Set-up method for feature configuration recently
incorporated in other KENWOOD products.
KENWOOD believes that the compact size coupled with
the reasonable cost will guarantee your satisfaction with
this product.
MODELS COVERED BY THIS MANUAL
The models listed below are covered by this manual.
TM-261 A: 144 M Hz FM transceiver
(U.S.A./ Canada/ General market)
TM-261 EJ: 144 MHz FM transceiver
(General market)
TM-461A: 440 MHz FM transceiver
(U.S.A./ Canada)
Memory Indexing conveniently allows you to assign
nam s to memory channels. Use callsigns, repeater
names, cities, persons’ names, etc.
In Memory Recall mode, memory channel numbers can
be displayed instead of frequencies if you choose.
Innovative Menu Set-up method combines sophisticated
features with simple operation; ergonomic design places
only the most frequently-used keys on the Front Panel
without losing desired features.
Dual Tone Squelch System (DTSS) allows selective
calling of specific stations.
Programmable with a RX Tone and TXTone separately.
This enhances the optional Continuous Tone Coded
Squelch System (CTCSS).
430 MHz FM transceiver
(China/ General market)
NOTICES TO THE USER
One or more of the following statements may be
applicable:
FCC WARNING
This equipment generates or uses radio frequency energy. Changes or
modifications to this equipment may cause harmful interference unless
the modifications are expressly approved in the instruction manual. The
user could lose the authority to operate this equipment if an
unauthorized change or modification is made.
INFORMATION TO THE DIGITAL DEVICE USER REQUIRED BY
THE FCC
This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation.
This equipment generates, uses and can generate radio frequency
energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However,
there is no guarantee that the interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment
off and on, the user is encouraged to try to correct the interference by
one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a circuit different from that to
which the receiver is connected.
• Consult the dealer for technical assistance.
PRECAUTIONS
Please c sen/e the following precautions to prevent fire,
personal injury, and transceiver damage:
• When operating mobile, do not attempt to configure
your transceiver while driving because it is simply too
dangerous.
• Be aware of local laws pertaining to the use of
headphones/headsets while driving on public roads.
If in doubt, do not wear headphones while mobiling.
• Do not transmit with high output power for extended
periods. The transceiver may overheat.
• Do not modify this transceiver unless instructed by
this manual or by KENWOOD documentation.
• Do not expose the transceiver to long periods of
direct sunlight nor place the transceiver close to
heating appliances.
• Do not place the transceiver in excessively dusty
areas, humid areas, nor on unstable surfaces.
• If an abnormal odor or smoke is detected coming
from the transceiver, turn OFF the power
immediately. Contact a KENWOOD service station
or your dealer.
• The transceiver is designed for a 13.8 V power
source. Never use a 24 V battery to power the
transceiver.
CONTENTS
THANK YOU!
MODELS COVERED BY
THIS MANUAL
FEATURES
NOTICES TO THE USER .........................................................i
PRECAUTIONS........................................................................i
SUPPLIED ACCESSORIES....................................................1
CONVENTIONS FOLLOWED IN THIS MANUAL.................. 1
PREPARATION FOR MOBILE AND FIXED STATION OPERATION
MOBILE INSTALLATION.......................................................2
Installation Example
Installation Steps
DC POWER CABLE CONNECTION..................................... 3
Mobile Operation.............................................................3
Fixed Station Operation..................................................4
Replacing Fuses..............................................................5
ANTENNA CONNECTION......................................................5
ACCESSORY CONNECTIONS
Externa! Speaker.............................................................6
Microphone......................................................................6
.........................................................
.........................................
............................................................
.......................................................
............................................................
............................................
Inside Front Cover
Inside Front Cover
Inside Front Cover
6
GBTIHG ACQUAINTED
FRONT PANEL
REAR PANEL
MICROPHONE.......................................................................10
DISPLAY................................................................................11
BUTTON FUNCTION DISPLAY............................................13
Basic State Display Labels
Labels After Pressing [F]
SWITCHING POWER ON/OFF
ADJUSTING VOLUME..........................................................14
2
2
ADJUSTING SQUELCH .......................................................14
SELECTING FREQUENCIES
Tuning Control
Microphone [UP]/[DWN] Buttons
TRANSMITTING....................................................................16
Selecting Output Power
MENU DESCRIPTION...........................................................17
.......................................................................
.........................................................................
...........................................
..............................................
OPERATING BASICS
.............................................
...............................................
...............................................................
.................................
................................................
MENUSET4JP
7
9
13
13
D
14
15
15
15
16
3
MENU ACCESS....................................................................17
MENU A CONFIGURATION.................................................18
MENU B CONFIGURATION.................................................19
OPERATtNG THROtJeH REPEATERS
REPEATER ACCESS...........................................................20
Selecting Offset Frequency
Selecting Offset Direction
Automatic Repeater Offset
(Some TM-261A Versions Only)...................................22
Activating Tone Function
Selecting a Tone Frequency.........................................23
REVERSE FUNCTION
........................................................
.........................................
............................................
.............................................
21
22
22
23
MEMORY CHANNELS
INITIALIZING MEMORY
Partial Reset (VFO)
Full Reset (Memory)
CHANNEL DISPLAY FUNCTION
......................................................
........................................................
......................................................
.........................................
29
29
29
29
j
NAMING MEMORY CHANNELS
Storing a Name in Memory
^ SCAN )
SCAN RESUME METHODS.................................................31
Time-Operated Scan
Carrier-Operated Scan..................................................31
VFO SCAN.............................................................................32
.....................................................
.........................................
...........................................
30
30
31
□
MEMORY SCAN....................................................................32
Locking Out Memory Channels....................................33
L8
STORING DATA IN MEMORY
Simplex Memory Channels...........................................25
Split Memory Channels.................................................25
RECALLING MEMORY CHANNELS
ERASING MEMORY CHANNELS........................................26
CALL CHANNEL
Recalling the Call Channel
Changing Call Channel Contents (Simplex)
Changing Call Channel Contents (Split)
MEMORY ^ VFO TRANSFERS
..................................................................
.............................................
...................................
...........................................
...............
.....................
...........................................
24
26
27
27
27
28
28
PROGRAM SCAN
Setting Scan Limits........................................................34
Confirming Scan Limits.................................................34
Using Program Scan......................................................35
CALLA/FO SCAN..................................................................35
CALL7MEMORY SCAN
CONTINUOUS TONE CODED SQUaCH SYSTEM (CTCSS)
USING CTCSS.......................................................................36
Automatic Tone Frequency ID
.................................................................
........................................................
......................................
34
35
36
[10
□
[12’
[13
[15
E DUAL TONE SQUELCH SYSTEM (DTSS)
STORING DTSS CODES
.....................................................
Using the Tuning Control or
Microphone [UP]/[DWN]
Using the Microphone DTMF Keypad
...............................................
.........................
Setting a Group Code...................................................38
USING DTSS........................................................................39
DTSS and Repeaters.....................................................39
M
DUAL TONE MULTf-FREQUENCY (OTWF) FUNCTIONS
MAKING DTMF CALLS
.......................................................
______________
STORING DTMF NUMBERS FOR THE
AUTOMATIC DIALER
CONFIRMING STORED DTMF NUMBERS
TRANSMITTING STORED DTMF NUMBERS
..........................................................
........................
...................
AUTOPATCH (U.S.A. AND CANADA VERSIONS) . 42
37
37
37
40
40
41
41
TIME-OUT TIMER (TOT)
BUSY CHANNEL LOCKOUT
.....................................................
...............................................
46
46
AUTOMATIC POWER OFF (APO).......................................46
TRANSCEIVER LOCK..........................................................46
CONFIGURING PROGRAM FUNCTION KEYS
Programming Microphone [PF]
.................................
..................
47
48
SWITCHING AM/FM MODE
(SOME TM-261A VERSIONS ONLY)...................................48
PACKET OPERATION ~)
1200 bps OPERATION
GENERAL INFORMATION
........................................................
MAiNTENANCE
..................................................
49
50
SERVICE...............................................................................50
SERVICE NOTE....................................................................50
CLEANING ...........................................................................50
Ш AUXILIARY FUNCTIONS
FULL RESET........................................................................43
KEYPAD DIRECT ENTRY
Frequency Entry............................................................43
Memory Channel Number Entry
CHANGING FREQUENCY STEP SIZE
Changes in Displayed Frequencies
IV
...................................................
..................................
..............................
............................
43
44
45
45
TROUBLESHOOTING
.........................................................
OPTIONAL ACCESSORteS ~]
INSTALLIN6 OPTIONS ^
INSTALLING THE TSU-8 CTCSS UNIT
[ SPECIFICATIONS
[ INDEX
.............................
51
54
SUPPLIED ACCESSORIES
CONVENTIONS FOLLOWED IN THIS MANUAL
Part Numlrnr
Microphone
U.S.A./Canada/
General (some): MC-53DM^
China/
General (some): MC-45^
DC power cable
Transceiver fuse
TM-261A: 15 A F51-0017-XX
TM-261EJ: 4 A
TM-461A: 10 A F51-0016-XX
Mounting bracket
Mounting bracket screws N99-0331-XX
Wrench W01-0433-XX
Warrantycard
(U.S.A./Canada only)
T91-0568-XX
T91-0516-XX
E 30-2111-XX
F51-0013-XX
J29-0628-XX
—
Quantity
1
1
1
1
1
1
1
1 set
1
1
The writing conventions described below have been
followed to simplify instructions and avoid unnecessary
repetition.
ATTENTION: Most procedures require that you press an appropriate
key in each step within approximately 10 seconds, or the previous mode
will be restored.
Instruclloii
Press [KEY].
Prpcc
[KEY1]+[KEY2],
PrpCQ
[KEY1], [KEY2].
Press and release KEY,
Press and hold KEY1 down,
then press KEY2.
Press KEY1 momentarily,
release KEY1, then press
Wltattofto
KEY2.
PpgQg
[KEY]+ POWER ON.
Press
[F] (1 s).
With transceiver power OFF,
press and hold KEY, then turn
ON the transceiver power by
pressing [POWER].
Press and hold the Function
key for 1 second or longer.
Instruction manual
The MC-53DM and MC-45 microphones are sold as
optional accessories also {page 53}.
B62-0605-XX
1
Press
[KEY] (1 s).
Press
[F], [KEY] (1 s).
Press and hold KEY until the
function begins.
Press [F] momentarily, release
[F], then press and hold KEY
for 1 second or longer.
PREPARATION FOR MOBILE AND FIXED STATION OPERATION
11 MOBILE INSTALLATION
Install the transceiver in a safe, convenient position inside
your vehicle that minimizes danger to your passengers and
yourself while the vehicle is in motion. For example,
consider installing the transceiver under the dash in front of
the passenger seat so that knees or legs will not strike the
radio during sudden braking of your vehicle. Try to pick a
well-ventilated location that is shielded from direct sunlight.
■ Installation Example
Use the supplied mounting bracket to install the
transceiver inside your vehicle. To enjoy the best
viewing angle, you can position the transceiver in the
bracket in a number of ways as shown below.
—I in^
If mounted underdash, the bracket must be installed
so that the 3 screw holes on the edge of each bracket
side are facing forward. This allows you to mount the
transceiver horizontally or to angle it fonvard.
If mounted with the bracket opening facing upward,
position the bracket with the 3 holes facing the rear to
angle the transceiver upward. Position the bracket
with the 3 holes facing forward if you plan to angle the
transceiver downward. The transceiver can be
mounted horizontally, angled neither up nor down, with
the bracket positioned either way.
2 Position the transceiver, then insert and tighten the
supplied hexagon SEMS screws and washers.
There are 2 screws and 2 washers supplied for each
side of the bracket.
Installation Steps
1 Install the mounting bracket in the vehicle using the
supplied flat washers and self-tapping screws.
There are 4 washers and 4 screws supplied.
• The bracket can be mounted with the bracket opening
for the transceiver facing down for underdash
mounting, or with the opening facing up.
• Double check that all hardware is tightened to prevent
vehicle vibration from loosening the bracket or
transceiver.
SEMS screw
DC POWER CABLE CONNECTION
■ Mobile Operation
The vehicle battery must have a nominal rating of 12 V.
Never connect the transceiver to a 24 V battery. Be
sure to use a 12 V vehicle battery that has sufficient
current capacity. If the current to the transceiver is
insufficient, the Display may darken during
transmission, or transmit output power may drop
excessively.
After the cable is in place, wind heat-resistant tape
arc .nd the fuse holder to protect it from moisture.
Tie down the full run of cable.
To prevent the risk of short circuits, disconnect other
wiring from the negative (-) battery terminal before
connecting the transceiver.
Confirm the correct polarity of the connections, and
attach the power cable to the battery terminals; red
connects to the positive (-i-) terminal, black connects
to the negative (-) terminal.
1 Route the DC power cable supplied with the
transceiver directly to the vehicle’s battery terminals
using the shortest path from the transceiver.
• If using a noise filter, it should be installed with an
insulator to prevent it from touching metal on the
vehicle.
• It is not recommended to use the cigarette lighter
socket since some cigarette lighter sockets introduce
an unacceptable voltage drop.
• If the power cable must be routed through a hole in the
vehicle chassis or body, for example in the firewall at
the front of the passenger compartment, use a rubber
grommet to protect the cable from abrasion.
Dismantle the fuse holder to pass the cable through
the firewall.
The entire length of the cable must be dressed so it is
isolated from heat and moisture.
• Use the full length of the cable without cutting off
excess even if the cable is longer than required. In
particular, never remove the fuse holders from the
5 Reconnect any wiring removed from the negative
terminal.
6 Connect the DC power cable to the transceiver’s
power supply connector.
• Press the connectors firmly together until the locking
Fixed Station Operation
In order to use this transceiver for fixed station
operation, you will need a separate 13.8 V DC power
supply that must be purchased separately.
The following table lists the current capacity
recommended for power supplies used with each type
of transceiver.
Tnmss8imMod«l
TM-261A
TM-261 EJ
TM-461A
Power Supply Ca|mc%
11 A or more
4 A or more
10 A or more
1 Connect the DC power cable to the regulated DC
power supply and check that polarities are correct
(Red: positive, Black: negative).
• DO NOT directly connect the transceiver to an AC
outlet!
• Use the supplied DC power cable to connect the
transceiver to a regulated power supply,
• Do not substitute a cable with smaller gauge wires.
2 Connect the transceiver’s DC power connector to
the connector on the DC power cable.
• Press the connectors firmly together until the locking
tab clicks.
Note:
For your trartsceiver to fully exhibit its performance capabilities,
the following optional power supply is recommended:
PS-33 (20.5 A, 25% duty cycle).
Before connecting the DC power supply to the transceiver, be
sure to svwtch the transceiver and the DC power supply OFF.
Do not plug the DC power supply into an AC outlet until you
make ail connections.
Replacing Fuses
ANTENNA CONNECTION
If the fuse blows, determine the cause then correct the
problem. After the problem is resolved, then replace the
fuse. If newly installed fuses continue to blow,
disconnect the power cable and contact your dealer or
nearest Service Center for assistance.
Rise Local^'efl
TM-261A
TM-261EJ
TM-461A
Supplied Accessory
DC Power Cable
CAUTION: Only use fuses of the specified type and rating.
Note: If you use the transceiver for a long period when the vehicle
battery is not fully charged, or when the engine is OFF, the battery
may become discharged, and will not have sufficient reserves to start
the veNcle. Avoid using the transceiver under these conditions.
Rise Currsiif Rating
15 A
4 A
10 A
20 A
Before operating, you must first install an efficient,
well-tuned antenna. The success of your installation will
depend largely on the type of antenna and its correct
installation. The transceiver can give excellent results if the
antenna system and its installation is given careful
attention.
Your choice of antenna should have a 50 impedance to
match the transceiver input impedance. Use low-loss
coaxial feed line that also has a characteristic impedance of
50 Q. Coupling the antenna to the transceiver via feed
lines having an impedance other than 50 Q reduces the
efficiency of the antenna system, and can cause
interference to nearby broadcast television receivers, radio
receivers, and other electronic equipment.
CAUTION:
♦ Transmitting without first connecting an antenna or other matched
toad may damage the transceiver. Always connect the antenna to
the transceiver before transmitting.
♦ Alt fixed stations should be equipped with a lightning arrester to
reduce ti^e risk of fire, electric shock, and transceiver damage.
connector
connector
ACCESSORY CONNECTIONS
■ External Speaker
If you plan to use an external speaker, choose a
speaker with an impedance of 8 Q. The external
speaker jack accepts a 3.5 mm diameter mono
(2-conductor) plug. Recommended speakers include
the SP-50B and SP-41.
To communicate in the voice modes, plug a 600 Q
microphone equipped with an 8-pin modular connector
into the modular socket on the Front Panel of the
transceiver. Press firmly on the plug until the locking tab
clicks.
GETTING ACQUAINTED
The following sections describe basic functions of the Front
Panel controls and buttons, Rear Pane! jacks and
connectors, microphone buttons and Display indicators.
For full explanations of functions mentioned, refer to the
appropriate sections elsewhere in the manual.
FRONT PANEL
The labels for some of the Front Panel buttons appear on
the Display instead of on the panel or buttons. The
displayed button labels change depending on which mode
the transceiver is in. This “GETTING ACQUAINTED”
section refers to the buttons that do not have labels on the
Front Panel by the labels that appear on the Display
immediately after switching ON the transceiver.
© VFO button
Selects the VFO mode {page 15}. The Tuning control
changes the transceiver frequency in this mode. Also
provides:
• Menu A or Menu B selection of choices (page 17}.
• VFO Scan start/stop to scan the entire VFO range {page 32}.
• Program Scan start/stop to scan a programmed range of
frequencies (page 34}.
© MR button
Selects the Memory Recall mode {page 26}. The Tuning
control changes the memory channel in this mode. Also
provides:
• Memory Scan start/stop {page 32}.
© Tuning control
Selects transmit/receive frequencies while in VFO mode
and memory channels while in Memory Recall mode
(pages 15, 26}. Also provides:
• Menu A or Menu B selection of function or choices (page 17].
• Program Scan limits select to choose the boundaries for this
type of scan (page 34},
• Scan direction select to choose if Scan progresses upward or
downward in frequency {pages 32, 35}.
• DTSS code select {page 37},
0 ®
® VOL control
Adjusts the level of receive audio from the speaker
{page 14}.
(D MN button
Selects the Memory Name mode {page 30}.
CD POWER switch
UP
-----------------------
DC 8 V, 200 mA max.
GND
--------
STBY (PTT) ■
GND (MIC) ■
MIC
--------RD : Open squelch audio (100 mV/10 ki2)
OWN
----------------------------------------------
® MHz button
Selects the MHz mode. This mode allows you to use the
Tuning control or the microphone [UP]/[DWN] buttons to
change the transceiver frequency in 1 MHz steps.
Also provides:
• AM/FM mode select (some TM-261A versions only)
{page 48}.
® F (Function) button
Allows you to select the different functions that are
available on multifunction buttons.
Switches the transceiver ON or OFF {page 14}.
© SQL (Squelch) control
Adjusts the squelch threshold level {page 14}. This allows
you to mute speaker output while no stations are being
received.
® Microphone connector
Insert the 8-pin modular connector plug until the locking tab
“clicks”.
8
---
----------------------------------------------------------------
© TONE button
Switches the Tone function ON or OFF {page 22}. When
the optional TSU-8 is installed, also switches the CTCSS
function ON or OFF. Also provides:
• Automatic Tone frequency ID activate/deactivate {page 36}.
® REV (Reverse) button
Switches the transmit frequency and receive frequency
when operating with a transmit offset or a split memory
channel {page 23}.
REAR PANEL
© Antenna cable
Connect an external antenna {page 5}. When making test
transmissions, connect a dummy load in place of the
antenna. The antenna system or load should have an
impedance of 50 £2. The connector accepts a male
PL-259 connector.
© Power Input 13.8 V DC cable
Connect a 13.8 V DC power source. Use the supplied DC
power cable (pages 3,4}.
© Speaker jack
If you wish, connect an optional external speaker for clearer
audio. Accepts a 3.5 mm diameter, 2-conductor plug.
MICROPHONE
CD CALL key
MC-53DM
(D UP button
(D DWN button
Raises or lowers the VFO frequency, the memory channel
number, the Tone/CTCSS frequency, or the DTSS code.
Holding either button down causes the action to be
repeated. Also, switches between values when selecting
values for functions with multiple choices.
Recalls the Call channel. Pressing for more than 1 second
initiates the Call/VFO Scan {page 35} or the Call/Memory
Scan {page 35}.
® VFO key
0 MR key
Identical to the Front Panel functions of the same names.
Both keys can be re-programmed, if desired {page 47}.
CD PF key
Depending on which function you select by accessing “PF”
in Menu B (page 48}, the function of this key differs. Refer
to “CONFIGURING PROGRAM FUNCTION KEYS"
{page 47}.
® DTMF keypad (MC-53DM only)
The 16-key keypad is used with the DTMF functions, or to
directly enter a freqeuncy or a memory channel number.
(3) PTT (Push-to-talk) switch
Press to transmit; release to receive. Also used to exit
various functions such as Scan, DTSS code select, or
Tone/CTCSS frequency select.
® LOCK switch
Locks all microphone functions except [PTT] and the
DTMF keypad, if equipped.
10
DISPLAY
® CT
Ф
wO R CT DT CO MENU j
* S \ ДРД
(3) (4) ® ® ®
-1
----
3-------5
7
------9-------
OVER
ON AIR
LM
Ф
Indicates the Transceiver Lock function is ON {page 46}.
® - +
Indicates the transmit frequency is offset (different) from the
receive frequency {page 22}. The symbol displayed (either
“ + ” or “ - ”) indicates the direction that the transmit
frequency is offset from the receive frequency. +”
appears when a split-frequency memory channel is
selected {page 25}.
® R
Indicates the Reverse function is ON {page 23}. Transmit
and receive frequencies are reversed. If any frequency is
selected for ‘TONE.RX” in Menu B, RX Tone frequency and
TX Tone frequency also are reversed. Refer to “Selecting a
Tone Frequency” {page 23}.
‘T' indicates the subaudible Tone encoder function is ON
{page 22}. “CT’ indicates the CTCSS function is ON
{page 36} provided the optional TSU-8 CTCSS unit is
installed {page 54}.
(D DT
Indicates the Dual Tone Squelch System (DTSS) is ON
{page 37}.
® CO
Indicates Carrier-Operated Scan Resume is ON {page 31}.
When not visible, Time-Operated Scan Resume is in effect.
(7) MENU
Visible while accessing Menu A or Menu B {page 17}.
® S.Mli.i.ts
Displays the transmit/receive frequency, frequency step
{page 45}, Offset frequency {page 21} and other data. Also
displays the menu selections when using Menu Set-Up.
The 1 MHz decimal point blinks while the transceiver is
scanning {pages 32, 35}.
® gg
Displays the currently selected memory channel number
{page 26}. The first digit displays “A” or “B” depending on
which Menu is being accessed.
11
This icon indicates the selected memory channel is
locked-out and will not be scanned by Memory Scan
{page 33).
® LM
Indicates whether Low (L) or Medium (M) transmit output
power is selected {page 16}. When neither “L” nor “M" is
visible, High output power is selected.
® B
Appears when the [F] button is pressed. Indicates
alternate functions of multiple-function buttons can be
accessed now.
BUSY
Indicates the squelch is open and the frequency is “busy”.
Also appears when the squelch is set to minimum by
turning the SQL control fully counterclockwise. If using
either CTCSS or DTSS, indicates the squelch is open due
to a received signal that contains the same CTCSS tone or
DTSS code that is programmed in your transceiver.
Indicates AM receive mode is ON {page 48). AM mode is
available only on some TM-261A versions only.
® TOT
Indicates the Time-out Timer function is ON {page 46).
Blinks while accessing Menu B, ‘ТОГ’.
® APO
Indicates the Automatic Power Off function is ON
{page 46}.
12
OVER
In Receive, acts as an S-meter to indicate the signal
strength of received signals. In Transmit, acts as an RF
power meter to indicate the relative transmit output power
{page 16}. Full scale represents High transmit power.
ON AIR
indicates the transceiver is in Transmit mode with a
transmit frequency selected that is within a transmit band.
BUTTON FUNCTION DISPLAY
Basic State Display Labels
TM-261
Some of the Front Panel buttons have more than one
function. This allows us to provide many functions on your
transceiver but keep the transceiver case small. To simplify
operation, the lower portion of the Display has labels that
indicate the current function of each of the 4 buttons on the
lower edge of the Front Panel. The label appears
immediately above its corresponding button.
When using any of the alternate functions of the multiple
function buttons, you have 10 seconds to select an
alternate function after pressing the [F] button. Pressing
[F] again or waiting for 10 seconds restores the Basic state
with button definitions of [MHz], [F], [TONE], and [REV].
KENWOOD
MHz
—and
Labels After Pressing [F]
LOCK ■ off DTSS SHIFT
TONE REV
J
13
SWITCHING POWER ON/OFF
ADJUSTING VOLUME
1 Switch ON the DC power supply.
• If operating mobile, skip this step.
2 Press the POWER switch to switch ON the transceiver.
To switch OFF the transceiver, press the POWER
switch again.
* In a fixed installation, 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.
Turn the VOL control clockwise to increase the audio level
and counterclockwise to decrease the level.
ADJUSTING SQUELCH
The purpose of squelch is to silence audio output from the
speaker when no signals are present. When squelch is set
correctly, you will hear sound only while a station is actually
being received. The point at which ambient noise on a
frequency just disappears, called the squelch threshold,
depends on the frequency.
Turn the SQL control clockwise to just eliminate the
background noise when no signal is present.
14
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