TM-281A - Kenwood
TM-281A
144 MHz FM Transceiver
Wild at Heart
On or off the road, KENWOOD’s TM-281A is a mobile radio you can
always count on. As tough as nails this MIL-STD-compliant transceiver delivers
powerful performance, excellent audio clarity, and a host of advanced features. It offers
superb operating ease day or night thanks to the large backlit LCD and
illuminated keys. So the next time you take off, take the TM-281A.
RUGGED, COMPACT CONSTRUCTION
MEMORY NAME FUNCTION
The TM-281A is tough enough for off-road assignments: it
meets the strict U.S. Department of Defense MIL-STD 810 C,
D, E, F & G environmental standards for vibration and shock.
Installation is easy due to its compact dimensions: 6.30 (W) x
1.69 (H) x 4.69 (D) inches (160 x 43 x 126 mm)*.
Up to 100 memory channels can be identified with a maximum of 6 alphanumeric
characters each. (200 channels are available if the memory name function is not used.)
200 MEMORY CHANNELS PLUS 1 CALL-CHANNEL
Each of the memory channels can be used to store transmit and receive
frequencies independently. Additionally, memory data can be edited and stored
on a computer*.
* Total depth of 6.71 inches or 170.5 mm with protrusion
HIGH POWER OUTPUT (65 W)
Even with its compact size, the TM-281A delivers up to 65 watts – the sort of RF
power you want in the wilderness – with a choice of High/Low output. A DTMF
microphone is also supplied as standard.
ALPHANUMERIC LCD AND ILLUMINATED KEYPAD
The vivid amber LCD display comes with a 32-step brightness control to suit any
ambient light conditions. It displays up to 6 large alphanumeric characters. The
front panel and microphone keypads are also illuminated for ease of use.
*Requires USB Programming Cable KPG-46U, and Memory Control Software MCP-1A (Ver. 3.0 or
later); consult your local dealer for details on purchasing these options.
MULTIPLE SCAN FUNCTIONS
Included as standard are VFO scan, memory scan, call scan, Tone/CTCSS scan
and DCS scan – with TO (Time-operated), CO (carrier-operated) and seek scan
resume modes. Also priority scan is available to check the Priority channel every
3 seconds.
CTCSS & DCS ENCODER/DECODER
The built-in CTCSS and DCS encoder/decoder covers 42 CTCSS sub-tone
frequencies and 104 DCS sub-tone frequencies.
WEATHER ALERT/RX (US only)
Memory name
Menu Mode
Power-on Message
IMPRESSIVE FRONT SPEAKER
The large oval speaker (2.28 x 1.38 inches or
58 x 35 mm) mounted in the front ensures every
message is heard loud and clear.
Providing an extra level of security, the TM-281A can receive the NOAA Weather
Band and respond to emergency transmissions such as storm warnings by
emitting an audible alert tone.
OTHER FUNCTIONS
❚ Power-on Message ❚ Wide/Narrow Deviation Selection (per channel) ❚ 1750 Hz Tone
Burst ❚ Automatic Simplex Checker ❚ Reverse Function ❚ Auto Repeater Offset ❚ Beep
On/Off ❚ Auto Power Off ❚ Time-Out Timer ❚ Channel Display Mode ❚ Busy Channel
Lockout ❚ Memory Channel Lockout ❚ MR-shift ❚ Direct Frequency Entry ❚ Key Lock
Optional Accessories
Specifications
TM-281A
GENERAL
Frequency Range
TX
RX
Mode
F3E (FM)
Power Requirement
Current Drain
144 - 148 MHz
136 - 174 MHz
13.8 V DC ±15 %, negative ground
Transmit
Receive
Operation Temperature Range
Less than 14 A (High), less than 8 A (Low)
Less than 1 A
50 ohms
Microphone Impedance
600 ohms
±2.5 ppm (-20 °C ~ +60 °C)
Dimensions (W x H x D),
(Projections included)
Weight
■ PG-2N
■ PG-3B
Desktop Microphone
DC Power Cable
DC Line Noise Filter
■ PS-60
■ SP-50B
■ KPS-15
DC Power Supply
External Speaker
DC-Switching Power
Supply
■ MJ-88
■ KPG-46U
■ MCP-1A (Ver.3.0 or later)
Microphone Plug
Adapter
USB Programming Cable
Memory Control Software
(USB driver can be downloaded
from http //www kenwood.com/i/
products/info/amateur/software_
download.html)
(available free for downloading
from http //www kenwood.com/i/
products/info/amateur/software_
download.html)
-20 °C ~ +60 °C
Antenna Impedance
Frequency Tolerance
■ MC-60A
6.30 x 1.69 x 4.69 in (160 x 43 x 126 mm)
6.33 x 1.69 x 6.71 in (161 x 43 x 170.5 mm)
2.5 lb (1.13 kg)
TRANSMITTER
RF Power Output
Hi / Lo
Modulation
65 W / 25 W
Variable reactance modulation
Maximum Frequency Deviation
Wide: ±5 kHz, Narrow: ±2.5 kHz
Modulation Distortion
Less than 3 % (300 Hz - 3 kHz)
RECEIVER
Circuitry
Intermediate
Double super heterodyne
1st IF
2nd IF
Sensitivity (12dB SINAD)
Squelch Sensitivity
Selectivity
-6 dB
-60 dB
Audio Output Power
49.95 MHz
450 kHz
Less than 0.18 µV (Narrow: less than 0.22 µV)
Less than 0.1 µV
More than 12 kHz (Narrow: more than 10 kHz)
Less than 30 kHz (Narrow: less than 24 kHz)
More than 2 W (5 % distortion)
KENWOOD follows a policy of continuous advancement in development.
For this reason specifications may be changed without notice.
Not all accessories are available in all markets. For availability, contact your nearest dealer.
Applicable MIL-STD
MIL-STD
Vibration
Shock
Method / Procedures
810C
514.2/Proc. VIII, X
810D
514.3/Proc. I
Category 8
810E
514.4/Proc. I
Category 8
810F
514.5/Proc. I
Category 20
810G
514.6/Proc. I
Category 20
516.1/Proc. I, II, V 516.3/Proc. I , IV 516.4/Proc. I , IV 516.5/Proc. I , IV 516.6/Proc. I , IV
CA-332K-E-2
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