TKR-751/851

VHF/UHF FM Repeater-Base Units

A versatile unit, the TKR-751/851 is a 16-user group conventional repeater, a simplex or full duplex base station or the RF core of a trunking system. Advanced features include DSP audio processing, DTMF over-the-air remote control and programmable Auxiliary I/O’s.

CONVENTIONAL REPEATER OPERATION

The TKR-751/851 is “community repeater-ready” with a built-in internal 16 QT/DQT group controller and programmable repeater functions such as CW Transmitter ID, Hang-Timer, Time-Out-Timer and Repeat Enable/Disable Key. The 1W-to-25W adjustable output power is ideal for on-site low power repeater applications.

CONVENTIONAL OR TRUNKING SYSTEM USE

The TKR-751/851 can serve as the core element of a conventional or trunking repeater system. The internal conventional controller can be used, or an external conventional or trunking logic controller can be easily interfaced for advanced systems.

SIMPLEX OR DUPLEX BASE STATION OPERATION

The TKR-751/851 can be operated in simplex or full-duplex base station mode with up to 16 channels and priority scan. Internal solid state antenna switching is provided for simplex single-antenna base station operation. The accessory connectors provide remote control interface. Also programmable are the six PF function keys, LED indicators, control/warning/alert/ power-on tones and tone volume for facilitating any remote site installation.

DTMF OVER-THE-AIR REMOTE CONTROL

All front panel PF Key functions and AUX Input functions can be remotely activated and deactivated over-the-air via DTMF codes (up to 16 digits each) and provide an acknowledgement single tone or custom DTMF transpond code. Also AUX Inputs, upon activation and deactivation will encode unique DTMF codes for monitoring and alarm purposes.

LED DISPLAY & INDICATORS

The enhanced 7-segment/2-character front panel LED provides 2-character alphanumeric channel designator and scan indicator for base station operation, a PLL unlock indicator and a PC program mode status. Front panel dual-color LED’s provide Transmit, Busy, Primary/Backup DC Power indications.

BACKUP POWER FEATURES

The Backup Battery Warning Tone transmits an over-the-air 5-second tone after DC supply has switched from “main’’ to “backup’’ power. Optionally a reminder Operation Tone can be transmitted while on backup power. These tones can be triggered when either DC power is connected to the “backup’’ DC input line or when the supplied voltage is lower than the programmed Power Supply Level DC voltage setting.

REPEATER FEATURES

Full-Duplex Operation

Built-in 16 QT/DQT Tone/Code Pair Community Repeater Operation

External Controller Interface

Conventional or Trunking Controller Compatible

Repeat Enable/Disable

8 CW Transmitter IDs

Repeat Hold Timer (hang timer)

Time Out Timer

BASE STATION FEATURES

16 Channel

Simplex or Full Duplex Operation

Antenna Switch For Simplex/Single Antenna Operation

Priority Scan

Remote Control Inputs

7-Segment 2-Character Channel & Scan LED

2 Character Alphanumeric Channel Designator

Power/Transmit/Busy LED Indicators

6 Lighted PF Keys

Local Takeover/Remote PF Key

Channel Up/Down PF Keys

Volume Control Knob

Courtesy Tone

Front Microphone Jack

Front Panel Speaker

Voice Encryption Port

GENERAL

19" Rack Mount Design

Primary DC Input Connector

Auto-Switched Back-up DC Input Connector

Backup Battery Warning/Operation Tones

Rear External Speaker Output (4 Watts Audio)

Rear Test-Speaker-AUX Connector (15-Pin)

Built-in Cooling Fan (temperature or continuous)

Programmable AUX Input/Output Functions

BCD Remote Channel Selection (4 lines)

Toggle or Momentary Operation on AUX Input Ports

Pre-Emphasis On/Off Control (at TA AUX Input)

DSP Processed QT/DQT

DSP Processed Companded Audio

QT/DQT Squelch-Tail Elimination

Beep Tones for Control, Warning, Alert & Power On

Electronic Serial Number (ESN)

Embedded Message with Password Protection

High Stability Oscillators (TCXO)

Windows® 98/2000/Me/XP PC programming & tuning

Flash Memory

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Kenwood TKR-751 manual Simplex or Duplex Base Station Operation, LED Display & Indicators, Backup Power Features, General

TKR-751, TKR-851 specifications

The Kenwood TKR-851 and TKR-751 are compact and powerful mobile two-way radios designed to enhance communication for various users, including those in commercial, industrial, and emergency services. These radios are a part of Kenwood's extensive portfolio, known for their reliability, robust performance, and advanced features.

One of the standout features of the TKR-851 is its impressive output power of up to 50 watts, which ensures wide coverage and exceptional clarity over long distances. The TKR-751 offers a slightly lower output power of up to 25 watts, making it ideal for applications where less power is sufficient. Both models feature a multi-channel memory, allowing users to store and access numerous frequency channels quickly, enhancing their operational efficiency.

In terms of design, the TKR series boasts a rugged build, adhering to military specifications for durability. This makes them suitable for use in harsh environments, including construction sites and emergency response scenarios. The front panel is intuitively designed with a large display that provides easy readability, even in bright sunlight. The user-friendly interface allows users to navigate through channels and settings with ease.

Kenwood has integrated advanced digital signal processing technology into the TKR series, which helps to reduce noise and enhance the audio quality of transmissions. This ensures clear communication, even in noisy environments. Additionally, the radios support both conventional analog and digital modes, providing versatility for users transitioning from analog to digital systems.

One of the notable features of the TKR-851 and TKR-751 is their compatibility with Kenwood's optional accessory lineup, which includes external microphones, headsets, and various power supplies. This allows users to tailor their communication equipment to suit specific operational needs.

The radios also come equipped with built-in CTCSS and DCS features for privacy and security, minimizing the risk of unauthorized monitoring. Furthermore, the built-in emergency alarm function enables users to alert others in case of emergencies, ensuring safety in critical situations.

With their robust features, durable design, and advanced technology, the Kenwood TKR-851 and TKR-751 are excellent choices for users seeking reliable and efficient communication in challenging environments. Whether it's in a commercial setting or an emergency response situation, these radios are well-equipped to meet the demands of today's communication needs.