VHF/UHF FM Repeater-Base Units
TKR-740/840
High-performance features, repeater mode, 32 channel simplex/full-duplex base mode, flash memory, DSP-based tone decoding, PC programmability, PC tuning, interface ports, test ports and programmable auxiliary ports make Kenwood’s Systems utilizing the embedded TKR-740/840
receiver-exciter units the first choice for demanding industrial and public service applications.
32 CHANNEL SIMPLEX/FULL-DUPLEX BASE MODE & PRIORITY SCAN
The 32 channel simplex/full-duplex base mode provides a perfect platform for high-end conventional base station systems. The priority scan capability permits multiple channel usage full-time or on command while monitoring a primary dispatch channel. The remote control and programmable ports permit full dispatch console access to all base station controls and functions. The front panel programmable function-keys (PF keys) with status LED’s provide full equipment room/on-site control and can be concealed and/ or disabled all together. The two-digit LED display provides channel display, operational status, programming status and fault indications.
REPEAT MODE & INTERNAL CONTROLLER
The TKR-740/840 repeater systems posses all the remote control, programmability and site control attributes as in base mode. Front panel PF key functions as Takeover (remote disable), TX Disable and Repeat On/Off can be assigned for site setup and maintenance use.
AUXILIARY MACRO PORTS
The 25-pin D-Sub controller interface port also provides six AUX Outputs and three AUX Inputs. The AUX Outputs are soft- ware programmable with functions such as PLL unlock, transmit sense, supply voltage sense, RSSI, exciter tempera- ture, etc., for site monitoring equipment and backup power and environmental systems. These AUX Outputs are programmable for active high or low and can be controlled by the AUX Input ports using signals from remote console termination panels or site control equipment. The AUX Inputs are programmable active high or low and can be programmed for any front panel PF function, perform direct channel access or AUX Output port control (turned on, turned off or toggled on/off the AUX output). Each AUX input has a “macro” capability and can control up to three AUX Output ports simultaneously. The 12-pin accessory connector has 5 macro-capable AUX I/O ports that are programmable for either AUX Input or Output functions.
PC PROGRAMMING AND TUNING
The TKR-740/840 can be programmed/tuned quickly and effi- ciently without ever opening the case. Programming/tuning can be done though front panel microphone/handset jack with the KPG-47D software, KPG-46 interface cable, and any PC- compatible computer. The same can also be done via the rear panel 25-pin connector. The PC tuning parameters available are shown below:
❚ Squelch (Analog/RSSI) | ❚ Signaling Deviation (TD) |
❚ RX audio signal output (RA) | ❚ Signaling balance |
❚ RX detector signal output (RD) | ❚ QT deviation |
❚ RF output power | ❚ DQT deviation |
❚ Maximum Deviation | ❚ Test tone deviation |
❚ TX audio input (TA) | ❚ CW ID deviation |
❚ Remote TX audio input (RTA) | ❚ Repeat gain |
| ❚ Voting tone level |
| ❚ Digital pager shift level |
| ❚ Digital pager wave balance |
The internal conventional repeater mode supports up to 16 user groups (16 QT/DQT) using Digital Signal Processing tech- niques. This also supports the traditional CW-ID, time-out timer, hang time, reverse burst squelch tail elimination, etc., repeater operations. The internal controller can be bypassed and an external conventional or trunking logic controller option used in its place.
MULTI-TONE/CODE TABLES & DSP PROCESSING
There are 16 programmable multi-tone/code tables each with 16 QT/DQT tone/code pairs that can be assigned on
a per channel basis. This provides multi-channel base stations up to 16 users groups per channel. This feature can also be used for fail-safe standby base or repeater units that can be activated into use in the even of a system failure (additional fail-safe systems engineering and components required).
LOW PROFILE DESIGN AND DIE-CAST CHASSIS
The low profile design saves site rack for other system components on multi-channel base systems and repeaters. The all metal encased panels and die-cast chassis with integrated heat sink are key to the TKR-740/840’s durability, superior service level and reduced weight. The unit is sealed to provide long-term protection from dust, moisture and for- eign ingress even in the most abusive operating conditions.
CONTINUOUS DUTY/HIGH STABILITY RF POWER OUTPUT The 100% duty cycle, 1.5 PPM high stability RF power output is continuously adjustable from a 100 mw to 5 W. The filtered impedance-matched output is the heart of the TKR-7400/8400 Series systems as the exciter stage for high-power systems or for direct output low power applications.
FLASH MEMORY ADVANTAGE
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.
LED INDICATORS
The LED indicators provide clear system status information at a
glance, including transmit, receive, external standard input and power. If the transmitter or receiver synthesizer become unlocked, the LEDs flash for quick problem assessment.
WIDE/NARROW CHANNEL SPACING
The TKR-740/840 are programmable for wide/narrow channel spacing* on a per channel basis [TKR-740: 25 (30) kHz wide/
12.5(15) kHz narrow; TKR-840: 25 kHz wide /12.5 kHz narrow]. The enhanced synthesizer PLL channel step programmability accommodates channel allocations now and in the future.
*Both models operate with no less than 25 kHz wide and 12.5 kHz narrow channel bandwidth.
Manual tuning is available for the following settings: RX helical resonator block bandwidth, MCF waveform, Quad detector coil, and MIC sensitivity.
EXTERNAL REFERENCE INPUT
The internal oscillator already provides an excellent ± 1.5 PPM stability figure, but for more demanding applications such as simulcast or paging systems, you can inject an exter- nal oscillator standard to obtain a much higher stability factor. The “REF” LED on the front panel changes from green to red when the external signal is applied.
LOCAL SPEAKER & MICROPHONE/TEST SWITCH
The built-in front panel speaker provides excellent audio for on-site monitoring and can be controlled via the volume on/off knob. The TEST switch allows you to activate the trans- mitter and the supplied hand microphone for air checks and the Intercom function.
OTHER FEATURES
❚COMPANDED AUDIO
❚EIGHT CW MESSAGE MEMORIES
❚VOTER TONE GENERATION
❚DIGITAL PAGING ENCODER INPUT (bi-level type; e.g. POCSAG)
❚VOICE SCRAMBLER PORT/CONTROL
