Kenwood TM 271A Manual

The Kenwood TM 271A is a 2-meter band mobile transceiver offering 65W output power, wide frequency coverage (136-174MHz), 207 memory channels, rugged construction, and versatile operating features. This VHF radio is designed for amateur radio operators with CTCSS/DCS encode/decode, priority channel monitoring, weather alert functions, and easy-to-use controls. Below are key sections covering features, installation, operation, programming, and troubleshooting.

Features at a Glance

Key components: Main unit with front panel controls, microphone connector, DC power input, antenna connector, external speaker jack.

Feature	Description
Frequency Range	136-174MHz (amateur 144-148MHz)
Output Power	65W/25W/5W selectable
Memory Channels	207 channels (200 regular + 6 scan edges + 1 call)
CTCSS/DCS	Encode/decode with tone scan
Weather Alert	NOAA weather channels with alert function
Priority Watch	Dual watch and priority channel monitoring
DC Power Input	13.8V DC negative ground
Antenna Connector	SO-239 type
Microphone Connector	8-pin modular
Size/Weight	140(W)×40(H)×158(D)mm, 1.1kg

Installation

Unpack and inspect contents. Choose suitable mounting location in vehicle.

1. Mounting: Use supplied bracket to securely mount unit under dash or other suitable location.
2. Power Connection: Connect red wire to positive (+) terminal, black wire to negative (-) terminal of 13.8V DC power source.
3. Antenna Installation: Connect antenna to SO-239 connector using proper coaxial cable.
4. Microphone Connection: Plug microphone into 8-pin connector on front panel.

WARNING! Ensure proper fuse rating (15A recommended). Verify negative ground system before connecting power.

First-Time Setup

Power on radio; configure basic settings.

1. Set operating frequency: Use main dial to select desired frequency (144-148MHz for amateur use).
2. Adjust squelch: Turn SQL control until background noise disappears.
3. Set output power: Press [LOW] button to cycle through power levels (65W/25W/5W).
4. Program memory channels: Store frequently used frequencies for quick access.
5. Configure CTCSS/DCS: Set tone codes if required for repeater access.

CAUTION! Ensure proper antenna is connected before transmitting to prevent damage.

Specifications

• Frequency Coverage: 136-174MHz (all model versions)
• Output Power: 65W/25W/5W selectable
• Modulation System: 16KΦF3E (FM)
• Antenna Impedance: 50 ohms
• Power Supply: 13.8V DC ±15% negative ground
• Current Drain: Receive: 0.8A (max audio), Transmit: 12A (65W)
• Operating Temperature: -20°C to +60°C
• Memory Channels: 207 channels total
• CTCSS Tones: 42 encode/decode + 1 custom
• DCS Codes: 104 encode/decode

Controls and Settings

Front Panel: Power/Volume knob, SQL control, Main dial, Function button, [LOW] power button, [MHz] button, [CALL] button, [V/M] button.

Microphone: PTT, Up/Down buttons, [F] function key, numeric keypad.

Basic Operations: Turn VOL knob for volume, SQL for squelch. Press [V/M] to toggle between VFO and memory modes. Use main dial to change frequency. Press [F] then desired button for secondary functions. [LOW] cycles power settings. [CALL] accesses call channel.

Connecting Accessories

External Speaker: Use external speaker jack for improved audio. Data Interface: Optional cable for PC programming. Power: 13.8V DC with proper fuse protection.

1. Turn off radio before connecting accessories.
2. Use Kenwood-approved accessories for optimal performance.
3. Ensure all connections are secure and weather-protected if exposed.

Tip: Use heavy gauge wire for power connections to minimize voltage drop.

Operating Modes

Supports various operating modes for flexible use.

1. VFO Mode: Direct frequency entry using main dial or keypad.
2. Memory Mode: Recall stored frequencies from memory channels.
3. Scan Modes: Memory scan, programmable scan, band scan.
4. Dual Watch: Monitor current frequency and priority channel.
5. Repeater Operation: Offset direction and frequency programmable.
6. Weather Alert: Monitor NOAA weather channels with alert function.
7. Tone Operations: CTCSS encode/decode, DCS encode/decode.

WARNING! Verify frequency and power settings comply with local regulations before transmitting.

Memory Programming

Store frequencies, tones, and settings in memory channels.

1. Select desired frequency and settings in VFO mode.
2. Press [F] then [V/M] to enter memory programming.
3. Select memory channel number using main dial or keypad.
4. Press [PTT] to store settings.
5. Repeat for additional channels.

Memory channels can store: Frequency, CTCSS/DCS tones, offset direction/frequency, power level, and more.

Care & Maintenance

Keep radio clean and dry. Use soft cloth for cleaning; avoid solvents.

CAUTION! Do not use abrasive cleaners. Keep connections clean and tight. Store in dry location when not in use.

Regulatory Information

FCC Part 97: Certified for amateur radio service. This device complies with Part 15 of FCC Rules. Operation subject to condition that device does not cause harmful interference. For amateur use only - operator must possess valid amateur radio license. Kenwood Corporation. For support, contact authorized Kenwood dealer or visit www.kenwood.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power connection/fuse	Check power connections; verify fuse; ensure proper voltage.
No transmission	PTT/microphone	Check microphone connection; verify PTT operation; check antenna.
Poor reception	Antenna/squelch	Verify antenna connection; adjust squelch; check coaxial cable.
Memory lost	Power interruption	Re-program memory channels; ensure continuous power to memory circuit.
Overheating	Ventilation/power	Ensure adequate ventilation; check power settings; reduce transmit time.

Reset: Turn off radio, press [F] + [PWR] while turning on for factory reset.

Service: Contact authorized Kenwood service center for repairs.