JVC Kenwood TKR-751/851 Series Analog Repeater (TKR-851K) 16 Channel, 25 Watt, 450-480MHz UHF, Analog Repeater.. Product #: tkr-851k based on 0 reviews Special Order

TKR-851 UHF 25 watt Analog Repeater


Brand: JVC Kenwood
Product Code: tkr-851k
Availability: Special Order

High Stability 100% Continuous Duty

The TKR-851's high stability 1.5PPM (2PPM for TKR-751) 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-751/851 has a high power output of 25W (at 100% duty).

16 Full-Duplex Channels & Single Priority Scan

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.

QT/DQT with DSP Multi-Decode

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.

Companded Audio

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

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.

2-Digit Numeric LED Display

The 2-digit numeric LED on the front panel displays channel number and operational status information, such as an "unlocked" error.

LED Indicators

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.

Windows® Programming and Tuning Software

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:

  • - Squelch
  • - DQT balance
  • - RX audio signal output (RA)
  • - QT deviation
  • - RX detector signal output (RD)
  • - DQT deviation
  • - RX frequency
  • - Test tone deviation
  • - RF output power - CW ID deviation
  • - 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.

6 PF Keys & Local Speaker

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.

Embedded Message with Password Lock

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.

External Control I/O

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.

Battery Backup System

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

Durable Die-Cast Chassis Contruction

The die-cast aluminum chassis with integrated heat sink is the key to the TKR-751/851's durability, service level and reduced weight. The entire unit is sealed to provide long-term protection even in the most demanding operating condition

General Specification
Frequency Range 450-480 MHz
Number of Channels and Groups 16 Channels and 1 Group
Power Supply Voltage 13.6 V DC ± 15%
Channel Spacing (Analog) 12.5 kHz
PLL Steps 2.5 / 5 / 6.25 kHz
Current Consumption
Operating Temperature Range -22˚ F to + 140˚ F (-30˚ C to +60˚ C)
Frequency Stability ± 1.5 ppm
RF Input-Output Impedance 50 Ohms
Dimension (H x W x D) 3.5 x 19 x 13.3 in (88 x 483 x 340 mm)
Weight (Approx.) 21.4 lbs. (9.7kg)
Display 2 Digit LED Display
IP Rating
Receiver Specification
Sensitivity 12dB SINAD 0.35 µV
Adjacent Channel Selectivity 75 dB (± 12.5 kHz)
Intermodulation 75 dB
Spurious and Image Rejection 90 dB
Audio Output 4 W (at 4 Ω, less than 5% distortion)
RX Hum and Noise 45 dB
Transmitter Specification
Output Power 25 W to 1 W
Modulation 11KØF3E
Maximum Deviation ±2.5 kHz Analog
Audio Distortion Less than 2% (at 0.3W)
Conducted Spurious Emission 80 dB
TX Hum and Noise 45 dB
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