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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  

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.

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