Kenwood TR 751A Manual

The Kenwood TR 751A is a high-performance amateur radio transceiver featuring 2-meter VHF operation, 50W output power, wide frequency coverage, multiple memory channels, CTCSS/DCS encode/decode, cross-band repeater function, and robust construction. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

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

Feature	Description
Frequency Range	136-174 MHz (RX), 144-148 MHz (TX)
Output Power	50W/25W/10W/5W selectable
Memory Channels	200 channels (100 regular + 100 scan edges)
CTCSS/DCS	50 CTCSS tones + 104 DCS codes
Cross-band Repeater	Full duplex cross-band operation
Power Requirement	13.8V DC ±15%
Antenna Connector	SO-239 (50 ohm)
Microphone Connector	8-pin modular jack
Data Port	For PC programming and data modes
Display	LCD with backlight

Installation

Unpack and inspect contents. Choose suitable mounting location.

1. Connect power: Red wire to positive (+), black wire to negative (-) of 13.8V DC power supply.
2. Connect antenna: Use 50-ohm coaxial cable to SO-239 connector.
3. Connect microphone: Plug 8-pin connector into MIC jack.
4. Mount securely: Use provided bracket for mobile or base station installation.

WARNING! Ensure proper polarity when connecting power. Reverse polarity may damage the unit.

First-Time Setup

Power on transceiver; initialize settings.

1. Set operating frequency: Use VFO knob or direct frequency entry.
2. Configure offset and tone: Set repeater offset and CTCSS/DCS as needed.
3. Program memory channels: Store frequently used frequencies with settings.
4. Adjust squelch: Set appropriate squelch level for your location.
5. Set power level: Select appropriate output power (50W/25W/10W/5W).

CAUTION! Ensure proper antenna is connected before transmitting.

Specifications

• Frequency Coverage: RX: 136-174 MHz, TX: 144-148 MHz
• Output Power: 50W max (selectable)
• Modulation: 16KΦF3E (FM)
• Power Supply: 13.8V DC ±15% negative ground
• Current Drain: RX: 0.5A (max audio), TX: 12A (50W)
• Dimensions: 140(W) × 40(H) × 180(D) mm
• Weight: 1.2 kg
• Operating Temp: -10°C to +60°C
• Memory Channels: 200 channels
• CTCSS/DCS: Built-in encode/decode

Controls and Settings

Front Panel: POWER switch, VOLUME knob, SQL knob, VFO knob, FUNCTION button, MHz/SCAN buttons.

Microphone: PTT, UP/DOWN buttons, FUNCTION button, numeric keypad.

Menu Settings: SQL level, power level, offset direction, tone frequency, scan mode, time-out timer, lock function, display contrast, backlight settings.

Connecting Accessories

External Speaker: Use SP jack for external audio. Data: Use data port for PC interface. Power: 13.8V DC with proper fuse protection.

1. Turn off power before connecting accessories.
2. Use recommended cables and connectors.
3. Ensure proper grounding for all connections.

Tip: Use high-quality coaxial cable for antenna connection to minimize loss.

Operating Modes

Supports simplex, repeater, and cross-band repeater operations.

1. Simplex Operation: Direct communication on same frequency.
2. Repeater Operation: Set appropriate offset (±600 kHz typical) and tone.
3. Cross-band Repeater: Enable in menu for full duplex operation.
4. Scan Operation: Program scan edges and enable scan function.
5. Memory Recall: Quick access to stored frequencies and settings.

WARNING! Transmit only on authorized frequencies with proper license.

Memory Functions

Store and recall frequencies with complete settings.

1. Store Memory: Tune to desired frequency, press [F] then [MR] to store.
2. Recall Memory: Press [MR] and select channel number.
3. Memory Name: Assign alphanumeric names to important channels.
4. Memory Scan: Scan only memory channels or specific memory groups.
5. Memory Lock: Protect important channels from accidental changes.

Maintenance

Keep unit clean and dry. Check connections periodically.

CAUTION! Disconnect power before cleaning. Use soft dry cloth only.

Regulatory Information

FCC Part 97: Amateur Radio Service. This device complies with Part 15 of FCC Rules. Operation is subject to amateur radio licensing. Copyright © Kenwood Corporation. For technical support, contact authorized Kenwood service centers or visit www.kenwood.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power connection/fuse	Check power connections; verify fuse is intact.
No transmission	PTT/microphone	Check microphone connection; verify PTT operation.
Poor reception	Antenna/SQL setting	Check antenna connection; adjust squelch level.
Memory lost	Power interruption	Internal backup battery may need replacement.
Overheating	Ventilation/power level	Ensure proper ventilation; reduce power level if necessary.

Reset: Hold [F] + Power On to reset to factory defaults.

Service: Contact authorized Kenwood service center for repairs.