Kenwood TS 790A Manual

The Kenwood TS 790A is a high-performance multi-band transceiver designed for amateur radio operations. This all-mode transceiver covers multiple amateur bands including 2m, 70cm, and 23cm with advanced features such as dual VFOs, built-in antenna tuner, DSP filtering, cross-band operation, and comprehensive memory functions. Below are key sections covering specifications, operation, installation, and maintenance.

Features at a Glance

Key components: Multi-band transceiver unit, microphone, power cable, mounting brackets, and remote control panel.

Feature	Description
Frequency Coverage	144-148 MHz, 430-450 MHz, 1240-1300 MHz
Operating Modes	SSB, CW, FM, AM, Digital
Power Output	50W on 2m, 35W on 70cm, 10W on 23cm
Dual VFOs	Independent VFO A and VFO B operation
DSP Filtering	Digital Signal Processing for enhanced reception
Antenna Tuner	Built-in automatic antenna tuner
Memory Channels	200 memory channels with alphanumeric tags
Cross-band Operation	Simultaneous reception on different bands
IF Shift	Adjustable IF shift for interference reduction
Power Requirements	13.8V DC, 20A max current

Installation

Unpack and inspect all components. Choose suitable mounting location.

1. Connect power: Use supplied power cable to 13.8V DC source with proper polarity.
2. Install antennas: Connect appropriate antennas for each band using quality coaxial cables.
3. Mount transceiver: Use mounting brackets for secure installation in vehicle or station.
4. Connect accessories: Attach microphone, external speakers, and data interfaces.
5. Grounding: Ensure proper grounding for safety and performance.

WARNING! Ensure proper ventilation; do not block cooling vents. Use appropriate fuses in power line.

First-Time Setup

Power on transceiver; initialize settings for optimal performance.

1. Power connection: Verify 13.8V DC connection with correct polarity.
2. Initial settings: Set operating mode, squelch, and volume levels.
3. Memory initialization: Clear and program memory channels as needed.
4. Antenna tuning: Use built-in tuner to match antenna impedance.
5. Frequency programming: Store commonly used frequencies in memory.

CAUTION! Verify antenna connections before transmitting to prevent damage.

Specifications

• Frequency Range: 144-148 MHz, 430-450 MHz, 1240-1300 MHz
• Modes: USB, LSB, CW, FM, AM, FSK
• Power Output: 50W (2m), 35W (70cm), 10W (23cm)
• Sensitivity: Better than 0.15μV for 12dB SINAD
• Selectivity: SSB: 2.4kHz, CW: 500Hz, FM: 15kHz
• Memory: 200 channels with alphanumeric naming
• Power Supply: 13.8V DC ±15%, 20A max
• Dimensions: 240W × 85H × 260D mm
• Weight: 3.8 kg
• Operating Temperature: -10°C to +60°C

Controls and Settings

Front Panel: POWER, VOLUME, SQUELCH, MODE, BAND, VFO A/B, MEMORY, FUNCTION keys.

Main Controls: RF POWER control, AF GAIN, SQL control, NB control, AGC settings, IF SHIFT, DSP settings.

Menu System: Access via FUNCTION key for advanced settings including:

• Display settings: Contrast, brightness, backlight timing
• Audio settings: Tone control, microphone gain, compression
• DSP settings: Filter width, noise reduction, auto notch
• Memory management: Channel programming, bank organization
• Scan settings: Priority watch, resume conditions

Connecting Accessories

Multiple connectors for external devices and accessories.

1. Microphone: Use 8-pin DIN connector for supplied microphone
2. External speaker: 3.5mm jack for external audio output
3. Data interface: CI-V compatible for computer control
4. Antenna ports: Separate connectors for each band
5. Power: Heavy-duty power connector with fuse protection

Tip: Use quality cables and proper connectors for optimal performance.

Operating Modes

Supports multiple operating modes for various communication needs.

1. SSB Operation: Select USB/LSB mode, adjust RF power and microphone gain
2. CW Operation: Use CW mode with adjustable sidetone and keyer speed
3. FM Operation: Select FM mode for repeater and simplex operation
4. Digital Modes: Connect to computer for PSK31, RTTY, and other digital modes
5. Cross-band: Simultaneously monitor different bands
6. Scanning: Programmable scan with priority channel watch
7. Memory Operation: Quick access to stored frequencies and settings

WARNING! Ensure proper license for intended operating frequencies and modes.

Memory Functions

Comprehensive memory system with 200 channels and advanced features.

• Channel storage: Frequency, mode, offset, tone settings
• Memory banks: Organize channels into logical groups
• Alphanumeric tags: Name channels for easy identification
• Memory scan: Scan selected memory channels
• Home channel: Quick return to designated frequency
• Memory lock: Protect important channels from accidental changes

Maintenance & Care

Regular maintenance ensures optimal performance and longevity.

1. Cleaning: Use dry cloth for exterior; compressed air for connectors
2. Connectors: Periodically check and clean all connectors
3. Cooling: Ensure ventilation paths remain clear
4. Firmware: Check for updates from Kenwood website
5. Calibration: Periodic alignment by authorized service center

CAUTION! Disconnect power before cleaning. Avoid liquids and abrasive cleaners.

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. Copyright © Kenwood Corporation. For technical support and service, contact authorized Kenwood service centers or visit www.kenwood.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power connection/fuse	Check power cable connection; verify fuse condition; ensure proper voltage.
No transmission	Microphone/antenna	Check microphone connection; verify antenna and SWR; check PTT operation.
Poor reception	Antenna/connections	Verify antenna connections; check coaxial cables; adjust squelch and RF gain.
Overheating	Ventilation/power	Ensure adequate ventilation; check for obstructions; verify proper power supply.
Memory loss	Backup battery	Check internal backup battery; reprogram memory channels if needed.

Reset: Function + Power for 5 seconds to reset to factory defaults.

Service: Contact authorized Kenwood service center for technical support.