Kenwood TM-221A Manual

The Kenwood TM-221A is a 2-meter amateur radio transceiver featuring 45W output power, 50 memory channels, CTCSS/DCS encode and decode, wide frequency coverage from 136-174MHz, dual receive capability, programmable scanning functions, and robust construction for mobile operation. Below are key sections for operation, programming, specifications, and troubleshooting.

Features at a Glance

Key components: Main transceiver unit, microphone, mounting bracket, DC power cable, and user manual.

Feature	Description
Frequency Range	136-174MHz (Rx/Tx)
Output Power	45W (High), 10W (Low)
Memory Channels	50 programmable channels
CTCSS/DCS	Encode and decode functions
Dual Watch	Monitor two frequencies simultaneously
Scanning	Programmable memory and band scanning
Power Supply	13.8V DC negative ground
Antenna Connector	SO-239 type
Microphone	Included with up/down controls
Display	LCD with backlight

Installation

Unpack and inspect all components. Choose suitable mounting location.

1. Mounting: Secure transceiver using provided bracket in vehicle or fixed location.
2. Power Connection: Connect red wire to positive (+), black wire to negative (-) of 13.8V DC source.
3. Antenna: Connect suitable 2-meter antenna to SO-239 connector.
4. Microphone: Plug microphone into front panel connector.

WARNING! Ensure proper polarity when connecting power to avoid damage. Use appropriate fuse in power line.

Basic Operation

Power on unit; adjust volume and squelch controls.

1. Frequency Selection: Use tuning knob or microphone up/down buttons.
2. Power Level: Press LOW button to toggle between 45W and 10W output.
3. Transmit: Press and hold PTT button on microphone to transmit.
4. Receive: Adjust squelch control to eliminate background noise.

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

Specifications

• Frequency Range: 136-174MHz
• Output Power: 45W (High), 10W (Low)
• Memory Channels: 50 channels
• Modulation: 16K0F3E (FM)
• Power Supply: 13.8V DC ±15%
• Current Drain: 12A max (transmit), 1A (receive)
• Dimensions: 140(W) × 45(H) × 180(D) mm
• Weight: 1.2 kg
• Operating Temp: -10°C to +60°C

Controls and Functions

Front Panel: POWER/VOLUME knob, SQL control, FUNCTION button, LOW button, tuning knob.

Microphone: PTT, UP/DOWN buttons, number keys for direct frequency entry.

Display: Shows frequency, memory channel, transmit indicator, and function status. Function Button: Accesses secondary functions including reverse, tone encode, memory operations.

Memory Programming

Store frequently used frequencies and settings in memory channels.

1. Select desired frequency and settings.
2. Press FUNCTION then MR to enter memory mode.
3. Select memory channel number (1-50).
4. Press MR again to store.
5. Recall memory: Press MR and select channel number.

Tip: Memory channels store frequency, offset, tone settings, and power level.

Scanning Operations

Scan programmed memory channels or frequency band.

1. Memory Scan: Press FUNCTION then SCAN to scan all memory channels.
2. Band Scan: Hold SCAN to scan current frequency band.
3. Programmable Scan: Set scan limits using function menu.
4. Priority Watch: Monitor priority channel while scanning.

WARNING! Be aware of local regulations regarding frequency usage and scanning.

Tone Functions

CTCSS and DCS encode/decode for accessing repeaters and private communications.

Enable Tone: Press TONE button to activate CTCSS encode. DCS Operation: Access through function menu for digital coded squelch. Tone Scan: Automatically detect CTCSS/DCS tones in use.

Maintenance

Keep unit clean and dry. Check connections periodically.

CAUTION! Do not use chemical cleaners on display or controls. Disconnect power before cleaning.

Regulatory Information

FCC Part 97: Certified for amateur radio service. This device must accept any interference received. For amateur use only. Proper amateur radio license required for operation. Copyright © Kenwood Corporation. For support, contact authorized Kenwood service centers.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power connection	Check DC power connections and fuse
No transmission	PTT/Mic connection	Check microphone connection and PTT function
Poor reception	Antenna/Squelch	Verify antenna connection; adjust squelch control
Memory lost	Power interruption	Internal backup battery may need replacement
No audio	Volume/Connections	Check volume setting and speaker connections

Reset: Power cycle unit; full reset through function menu if needed.

Service: Contact authorized Kenwood service center for technical support.