KENWOOD NEXEDGE NX-740(H)/840(H)
VHF/UHF Digital & FM Mobile Radios
The future of mobile communications is digital, and the KENWOOD NEXEDGE NX-740H/840H/740/840 series offers enhanced coverage, superior clarity, and inherent voice security. These mobile radios provide intuitive operation, high-powered performance, and round-the-clock reliability. Uniquely, they operate in both analog FM and NXDN digital modes, facilitating a smooth migration from legacy systems.
[Image of the KENWOOD NEXEDGE NX-740(H)/840(H) mobile radio unit, showing its front panel with a display, buttons, and microphone connector.]
Key Features
NXDN Digital Air Interface
NEXEDGE radios utilize NXDN, an FDMA digital air interface featuring AMBE+2™ voice coding technology, advanced filtering, and a 4-level FSK modulation technique. This ensures a low bit error rate (BER) even at weak RF signal strengths.
Enhanced Audio Quality
AMBE+2 VOCODER technology accurately reproduces natural human speech nuances for superior voice quality, even at highway speeds. The powerful 57 x 35 mm oval speaker delivers up to 4W (4Ω impedance) audio output for undeniably clearer and crisper sound.
Ultimate Performance
Maximum RF output power is 50W for the NX-740H VHF model, 45W for the NX-840H UHF model, and 25W for the NX-740/840 VHF/UHF models. The NX-840 Series offers UHF frequency coverage of 70 MHz.
High Security
KENWOOD prioritizes confidentiality. In analog mode, a 16-code voice inversion scrambler provides security. Robust NXDN encryption is available for digital mode communications.
32 Channels / 2 Zones
This radio supports two conventional zones, with up to 16 channels available per zone.
Switchable Digital and Analog Dual Modes
The NX-740/840 Series functions as two radios in one. It operates on 12.5/25 kHz in analog zones and on 6.25/12.5 kHz NXDN in digital zones. A programmable function (PF) key can be used to switch between zones for convenience.
6.25 & 12.5 kHz NXDN Digital Channels
Digital communications offer greater spectrum efficiency and wider area coverage compared to analog systems.
NXDN Digital Conventional
Compatible with NEXEDGE Digital Conventional Mode, this radio supports 64 RAN (Radio Access Numbers) and individual & conference group calling for efficient communications.
NXDN Type-D Digital Trunking
The NX-740/840 Series supports the NXDN Type-D digital trunking protocol. This architecture, also known as distributed or decentralized trunking, allows all channels to operate as traffic channels without requiring a dedicated control channel. This enables the development of an efficient, reliable, and affordable trunking system, ideal for users migrating to small-scale digital trunking systems. ⭐ Requires activation.
GPS Feature
Connecting a GPS unit to the NX-740/840 Series allows accurate vehicle location (GPS) data to be transmitted to the central base station for fleet management purposes.
External D-SUB 15-PIN Interface
The radio's D-Sub 15-pin terminal supports peripheral connections, including Ignition Sense, External Switch, and Horn Alert. Molex interface compatibility is available via the optional KCT-60 cable.
Other Features
- DIGITAL: Over-The-Air Alias (TX only) Paging Call, Individual Call & Conference Group Call, Status Messaging, Remote Monitor, Site Roaming, Late Entry, NXDN ESN.
- ANALOG: FleetSync, MDC-1200, DTMF, QT/DQT/2-tone, Compander, Squelch Level.
- GENERAL: Multiple Scan, 4-Color LED (Blue / Red / Green / Orange), 9 PF Keys, Voice Announcement (select a language from English, Spanish, or Russian), Emergency Call, Remote Stun/Kill, Lone Worker Alert, Time Out Timer, Busy Channel Lockout, Horn Alert, Ignition Sense, Wired Cloning, Password Protection, PTT Release Tone, Minimum Volume, Mic Sense, MIL-STD-810 C/D/E/F/G, [IP54 rating] Water & Dust Intrusion.
Optional Accessories
- KMC-30 Microphone: [Image of a handheld microphone]
- KMC-36 Keypad Microphone: [Image of a keypad microphone]
- KES-5 External Speaker: [Image of a compact external speaker]
- KCT-60 Connection Cable: [Image of a coiled cable with connectors]
- KMC-32 Keypad Microphone: [Image of a different style of keypad microphone]
- KMC-9C Base Microphone: [Image of a base station microphone]
- KCT-18 Ignition Sense Cable: [Image of a cable with a specific connector for ignition sense]
- KLF-2 Line Filter: [Image of a small inline filter device]
- KMC-35 Microphone: [Image of another handheld microphone model]
- KES-3 External Speaker: [Image of a different external speaker model]
- KCT-36 Extension Cable: [Image of a coiled extension cable]
- KMB-10 Key Lock Adapter: [Image of a key lock adapter accessory]
All accessories and options may not be available in all markets. Contact an authorized KENWOOD dealer for details and a complete list of all accessories and options.
Specifications
General
| Parameter | NX-740H/740 | NX-840H/840 |
|---|---|---|
| Frequency Range | [Type 1] 136-174 MHz [Type 2] 400-470 MHz |
[Type 1] 450-520 MHz |
| Number of Channels | Max. 32 | |
| Number of Zones | 2 | |
| Max. Channels per Zone | 16 | |
| Channel Spacing | Analog: 12.5/25 kHz Digital: 6.25/12.5 kHz |
Analog: 12.5/25 kHz Digital: 6.25/12.5 kHz |
| Operating Voltage | 13.6V DC ± 15% | |
| Operating Temperature Range | -30 °C ~ +60 °C | |
| Frequency Stability | ±2.0 ppm | ±1.0 ppm |
| Antenna Impedance | 50 Ω | |
| Dimensions (W x H x D) | 160 x 43 x 122.6 mm | |
| Weight (net) | Projections Not Included | Radio only |
| 1.10 kg | 1.10 kg | |
Receiver
| Parameter | NX-740H/740 | NX-840H/840 |
|---|---|---|
| Sensitivity | Digital @ 6.25 kHz (3% BER): 0.28 μV Digital @ 12.5 kHz (3% BER): 0.28 μV Analog (12 dB SINAD): 0.28 μV |
Digital @ 6.25 kHz (3% BER): 0.28 μV Digital @ 12.5 kHz (3% BER): 0.28 μV Analog (12 dB SINAD): 0.28 μV |
| Selectivity | Analog @ 12.5 kHz: 65 dB Analog @ 25 kHz: 75 dB |
Analog @ 12.5 kHz: 65 dB Analog @ 25 kHz: 75 dB |
| Intermodulation | 70 dB | 70 dB |
| Spurious Response | 75 dB | 75 dB |
| Audio Distortion | Less than 5% | Less than 5% |
| Audio Output | 4W / 4Ω | 4W / 4Ω |
Transmitter
| Parameter | NX-740H/740 | NX-840H/840 |
|---|---|---|
| RF Power Output | 50-5 W (NX-740H) 25-5 W (NX-740) |
45-5 W (NX-840H) 25-5 W (NX-840) |
| Spurious Response | 70 dB | 70 dB |
| FM Hum & Noise | Analog @ 12.5 kHz: 40 dB Analog @ 25 kHz: 45 dB |
Analog @ 12.5 kHz: 40 dB Analog @ 25 kHz: 45 dB |
| Audio Distortion | Less than 5% | Less than 5% |
| Modulation | 16K0F3E, 11K0F3E, 4K00F1E, 4K00F1D, 4K00F7W, 4K00F2D, 8K30F1E, 8K30F1D, 8K30F7W | |
*Ver. 2.0 models are compatible with Analog 25 kHz and Digital 12.5 kHz Channel Spacing. Measurements made per CAI measurement procedures (digital) and TIA-603 (analog); specifications are typical. Details and timing of firmware and software updates are subject to change without notice. Specifications are subject to change without notice, due to advancements in technology.
FleetSync® is a registered trademark of JVCKENWOOD Corporation. Windows® is a registered trademark of Microsoft Corporation in the United States and other countries. AMBE+2™ is a trademark of Digital Voice Systems Inc. NXDNTM is a trademark of JVCKENWOOD Corporation and Icom Inc. NEXEDGE® is a registered trademark of JVCKENWOOD Corporation.
Applicable MIL-STD & IP
| MIL Standard | MIL 810C Methods/Procedures | MIL 810D Methods/Procedures | MIL 810E Methods/Procedures | MIL 810F Methods/Procedures | MIL 810G Methods/Procedures |
|---|---|---|---|---|---|
| Low Pressure | 500.1/Procedure I | 500.2/Procedure I, II | 500.3/Procedure I, II | 500.4/Procedure I, II | 500.5/Procedure I, II |
| High Temperature | 501.1/Procedure I, II | 501.2/Procedure I, II | 501.3/Procedure I, II | 501.4/Procedure I, II | 501.5/Procedure I, II |
| Low Temperature | 502.1/Procedure I | 502.2/Procedure I, II | 502.3/Procedure I, II | 502.4/Procedure I, II | 502.5/Procedure I, II |
| Temperature Shock | 503.1/Procedure I | 503.2/Procedure I | 503.3/Procedure I | 503.4/Procedure I, II | 503.5/Procedure I |
| Solar Radiation | 505.1/Procedure I | 505.2/Procedure I | 505.3/Procedure I | 505.4/Procedure I | 505.5/Procedure I |
| Rain* | 506.1/Procedure I, II | 506.2/Procedure I, II | 506.3/Procedure I, II | 506.4/Procedure I, III | 506.5/Procedure I, III |
| Humidity | 507.1/Procedure I, II | 507.2/Procedure II, III | 507.3/Procedure II, III | 507.4 | 507.5/Procedure II |
| Salt Fog* | 509.1/Procedure I | 509.2/Procedure I | 509.3/Procedure I | 509.4 | 509.5 |
| Dust* | 510.1/Procedure I | 510.2/Procedure I | 510.3/Procedure I | 510.4/Procedure I, III | 510.5/Procedure I |
| Vibration | 514.2/Procedure VIII, X | 514.3/Procedure I | 514.4/Procedure I | 514.5/Procedure I | 514.6/Procedure I cat. 20 |
| Shock | 516.2/Procedure I, II, III, V | 516.3/Procedure I, IV, V | 516.4/Procedure I, IV, V | 516.5/Procedure I, IV, V | 516.6/Procedure I, IV, V |
| International Protection Standard | [IP54 rating] Water & Dust Protection | ||||
*Required conditions: Microphone (KMC-35 or KMC-36) is connected; Cap shall be installed on the speaker connector; Cover shall be installed at D-sub connector (15pin); and KCT cable and/or SP cable are not connected.
