Kenwood NXR-710/810 VHF/UHF Digital & FM Base-Repeaters
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– High Stability 100% Continuos Duty
– 16 Full-Duplex Channels & Single Priority Scan
– QT/DQT with DSP Multi-Decode
– Companded Audio
– Flash Memory
– 2-Digit Numeric LED Display
– LED Indicators
– Wide/Narrow Channel Bandwidth per Channel
– WINDOWS® Programming and Tuning Software
– 6 PF Keys & Local Speaker
– Embedded Message with Password Lock
– External Control I/O
– Battery Backup System
– Durable Die-Cast Chassis Construction - Frequency Range
･VHF: 136-174 MHz (NXR-710)
･UHF: 450-520 MHz, 400-470 MHz (NXR-810)
RF Output
･VHF: 50 W @ 50% duty, 25 W @ 100% duty (NXR-710)
･UHF: 40 W @ 50% duty, 25 W @ 100% duty (NXR-810)
Repeater Operation
Duplex / Simplex Base Operation
30 CH Scanning Base
Two-Digit LED Display
6 Lighted Programmable Function Keys
Front Panel Speaker
Rear External Speaker Output (4 W Audio)
Volume Control
Microphone Jack
Program Interface
Remote Termination Interface
Programmable AUX I / O’s
RF Power Down Detect
DTMF Front Panel PF Key Control
DTMF AUX Output Control
DTMF AUX Input Monitoring
External Frequency Reference (10 MHz) Connectivity
Windows® PC Programming
Flash Firmware Upgrading
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- NXDN® Digital Air Interface
Conventional IP Network
AMBE+2™ VOCODER
6.25 & 12.5 kHz Channels
Mixed FM / Digital Operation
NXDN® Scrambler Built-in
16 RAN Repeater Control Built-in
1,000 GIDs Per Site
1,000 UIDs Per Site
Individual & Group Selective Call
All Group Call
NXR Over-the-air Alias
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- VHF: 25, 20*1 & 12.5 kHz Channels
UHF: 25, 20*1 & 12.5 kHz Channels
Built-in Scrambler
16 QT / DQT Repeater Control Built-in
Hang Timer / Time Out Timer / CW ID
External FM Controller Interface
EIA Voter Tone Generation
External LTR® Controller Interface
External MPT Controller Interface
What’s in the box:
1 x NXR-710 or NXR-810 Repeater with Power Supply & Duplexer
2 x Connector Cables
1 x Manual
The TKR-850’s high stability 1.5PPM (2PPM for TKR-750) TCXO modules, 100% duty RF power amplifier (25W output), integrated die-cast heat sink and forced-air cooling provide site-friendly, continuous operation. The TKR-750 has a high power output of 50W (at 50% duty) while the TKR-850 offers 40W (at 50% duty).
Repeaters can function as a base station or repeater backup unit to suit various applications. The built-in 16 channels are preset and selectable from a remote control utilizing the remote I/O connector or pre-programmed key on the front panel. The programmable function (PF) keys located on the front panel permit adjustment and testing of repeater sites. In addition, single priority scan is available when the unit is operating in simplex mode.
For QT/DQT groups sharing the same RF signal range, DSP processing allows up to 16 QT/DQT signal variations to be processed simultaneously via the multi-decode function. Two decode tables (main/sub) are available to facilitate the setup of channels to different multi-decode ranges.
A built-in compander contributes to improved audio when operating as a simplex base station. A wide/narrow setting is available for each channel
Flash memory permits updates, advanced feature sets and system architectural changes to be made electronically without ever opening the unit. This means faster modifications for system operators and less downtime for users.
The 2-digit numeric LED on the front panel displays channel number and operational status information, such as an “unlocked” error.
The LED indicator lights provide clear system status information at a glance, including transmit, receive, battery backup, and DC power. If the transmitter or receiver becomes unlocked, the LEDs flash for quick problem assessment.
The TKR-750/850 can handle both existing wideband systems and emerging narrow band applications for extra flexibility and long-term viability.
The repeater can be programmed from a Windows® compatible PC quickly and efficiently – without ever opening the case – using the optional FPU and programming interface cable. Among the radio parameters available for programming are:
– DQT balance
– RX audio signal output (RA)
– QT deviation
– RX detector signal output (RD)
– DQT deviation
– RX frequency
– Test tone deviation
– RF output power
– Maximum deviation
– Repeat gain
– TX audio input (TA)
– TX frequency
– Signaling deviation (TD)Manual tuning is available for the following settings: RX helical resonator block bandwidth, MCF waveform, Quad detector coil, and MIC sensitivity.
In addition to 6 programmable function keys (each equipped with an LED indicator), the front panel has a built-in speaker. This makes it easy to check on repeater site reception conditions. There is also a microphone terminal to allow audio transmission.
The repeater’s flash memory can store an electronic message – with password protection – containing owner identification, property ID numbers, user and department names, service records, etc. Additionally, the FPU can be used to display an electronic serial number. A unit can thus be electronically identified even if the external labels, marking or factory serial numbers have been removed.
The D-SUB25 connector on the rear panel provides a control I/O interface for external controllers to enable customization and integration with other features and capabilities.
Several power-saving features, including a display- off function, help to reduce energy consumption. A built-in backup system supports automatic switching to a 12v battery* if the ACbased power supply* fails.
*Not supplied
The die-cast aluminum chassis with integrated heat sink is the key to the TKR-750/850’s durability, service level and reduced weight. The entire unit is sealed to provide long-term protection even in the most demanding operating condition 
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