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Tele Command Decoder Digital

Telecommand System is Used in missile for Range safety. The unit can receive coded commands for SAFE, ARM,TT(Thrust termination) & DESTRUCT functions form ground stations.

The FSK modulated UHF band carrier from ground are received by the on-board antennas and power combined and fed to a UHF receiver. The receiver demodulated base band signal fed to the Command decoder. The command decoder decodes the commands and drives the respective command relays, which in turn activate pyro chains.

Electrical:

DC Input : ±28 DC ±6V.

Input : FSK,PCM Serial.

Code : Bi Ø-L.

No.of Commands : 3/4.

Commands : Safe,Arm,TT,Destruct.

Frame Length : 16 Bits(Programmable).

Word Length : 12 Bits(Programmable).

Data Rate : 2K Bits.

FSK Frequencies : 18 KHz/22 KHz.

Status : LPST.

Command : Safe,Arm TT,Destruct.

Relay : Safe,Arm TT,Destruct.

Status Output : 2.5V.

Pyro Output : 10A @ 28V.

Mechanical Dimensions : 134 x 130 x 72mm.

Tele Command Receiver

The Telecommand Receiver is designed to operate in the UHF band.The receiver is a single conversion Super heterodyne type receiver. The IF signal is detected to recover the base band data. The receiver feature high operational sensitivity of about -102dBm and dynamic range of 80 dB. The receiver is designed from scratch using LNA, RF BPFs, IF BPSs, MIXER Local Oscillator (LO), Limiting amplifier, FM demodulator.

Electrical:

Center Frequency : UHF Band.

IF band width at 3dB : 400 KHz(min).

60dB : 2.2MHz(max).

Sensitivity : -95 dBm or better.

Demodulation : FM.

Dynamic range : 80dB.

Video Bandwidth :2MHz

Lower 3dB freq : 7KHz.

Higher 3dB freq : 200KHz.

Image,spurious & IF rejection : 60 dB(min).

Video output: 30m Vrms/10KHz.

FM Deviation : 100 KHz minimum.

RSSI : 0 to 5V over dynamic range 0.5 Volt at Threshold.

Power Supply input Voltage : ±28V ±4V DC with transient protection upto 70 Volts pulse of 10 micro secs.

Current : 250 mA(max).

Reverse polarity protection : No damage to the unit on application of Reverse Polarity Power input.

EMI/EMC : As per MIL-STD-461D.

Mechanical Dimensions : 125 x 95 x 40(excluding connectors).

Weight : 750g(max).

Tele Command Ground System

The Telecommand Ground System Unit generates test signals UHF Band with FSK modulation. The FSK modulation is generated internally to simulate the telecommands. The unit is used to test other telemetry sub systems like telecommand receiver, telecommand decoder and telemetry power combiners. The unit uses synthesis approach for generation of high carrier stability and accuracy. The unit delivers an output of +20 dBm power at 434 MHz carrier frequency.

Electrical Specifications of TTU :

Carrier Frequency : UHF Band.

Carrier Frequency stability : ±0.003% over the Temp. Range.

Type of Modulation : PCM / FSK / FM.

PCM Data Rate : 2 KHz.

FSK carriers : 18 and 22 KHz(within 10Hz).

Command Dwell Time : 10 sec.

Power Output(CW) : > -20 dBm to ANT.

Maximum Deviation : 100±10 KHz.

Freq. Response(within 3dB) : 10 KHz to 100 KHz.

Harmonic & Spurious : -20 dBc(min).

Operating Voltage : 9V DC.

Operating Current : 50 mA(max.).

Connectors:

Controls : 6 pin D38999 series (20FA35PN). Pin 1-FSK, Pin 2-Manch Data, Pin 3-TXD, PIN 4-RXD, PIN 5-Mod Cont, Pin 6-GND.

RF out : SMA(F) On PCB.

DC Power Supply : 2-Pin Jack.

Switches : Commands-5 Nos. Power-1No. ON/OFF.

Power Adaptor : 230 V AC to 9 V DC/200m Amp.

Mechanical Dimensions:

Size : As per Mechanical Drawing(130 x 120 x 50) mm.

Tele Command Simulation Unit

The Telecommand Simulation Unit generates test signals at 434MHz with FSK modulation. The FSK modulation is generated internally to simulate the telecommands. The unit is used to test other telemetry sub systems like telecommand receiver, telecommand decoder and telemetry power combiners. The unit uses synthesis approach for generation of high carrier stability and accuracy. The unit delivers an output of +20 dBm power at 434 MHz carrier frequency.

Electrical:

Carrier Frequency : 434 MHz/422 MHz.

Carrier Frequency stability : ±0.003% over the temp. Range.

Type of Modulation : PCM / FSK / FM.

PCM Data Rate : 2KHz.

FSK carriers : 18 and 22 KHz (within 10Hz).

No. of commands : 3.

Command dwell time : 10 sec.

Power Output(CW) : > -20 dBm(Two ports).

Maximum Deviation : 100±10 KHz.

Freq. Response : 10 KHz to 100 KHz.

Harmonic & Spurious : -20 dBc(min).

Operating Voltage : 28±6V DC.

Operating Current : 50 mA (max).

Connectors:

DC Power Supply : 6 Pin D38999 series(20FA35PN).

RF Output : TNC(F).

Tele Command Encoder Test Unit

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The Telecommand Encoder Test Unit generates test signals at 434MHz with FSK modulation. The FSK modulation is generated internally to simulate the telecommands. The unit is used to test other telemetry sub systems like telecommand receiver, telecommand decoder and telemetry power combiners. The unit uses synthesis approach for generation of high carrier stability and accuracy. The unit delivers an output of +20 dBm power at 434 MHz carrier frequency.

Electrical:

Carrier Frequency : 434 MHz / 442 MHz / 426 MHz.

Carrier Frequency stability : ±0.003% over the temp. Range.

Type of Modulation : PCM / FSK / FM.

PCM Data Rate : 2 KHz.

FSK carriers : 18 and 22 KHz(within 10Hz).

No. of commands : 4.

Command dwell time : 10 sec.

Power Output(CW) : > -20 dBm (Two ports).

Maximum Deviation : 100±10 KHz.

Freq. Response(within 3dB) : 10 KHz to 100 KHz.

Harmonic & Spurious : -20 dBc(min).

Operating Voltage : 9V±1V DC.

Operating Current : 50 mA(max.).

Connectors:

DC Power Supply : 6 Pin D38999 series (20FA35PN).

RF output : TNC(F).

DC-9V Power Socket : Adopter Socket.

Mechanical Dimensions:

Size : (112 x 102 x 37.5) mm (max.).

Tele Command FM Transmitter

This is telecommand transmitter which can accept FM base band signal fro 20 KHz to 2 MHz and modulate on a S band carrier. The carrier is generated from a stable phase locked source reference to a crystal source of high frequency stability. The unit is packaged in a size of 70x60x25mm. The operating voltage is 10 to 18 V DC and draws about 600 ma. The out has very low spurious level os less than -60dBc.

Electrical:

Carrier Frequency : Telemetry S Band.

Frequency Stability : 30 ppm.

Type of modulation : FM.

RF output power : 500 mw (Min).

Deviation sensitivity : 1 MHz/Vp-p(typical).

Deviation linearity : ±5%.

Mod. Frequency response : 20 KHz to 2 MHz.

Incidental FM : ±8 KHz.

Mod. Input impedance : 10k Ohms.

Spurious response : < 60 dBc.

Operating Voltage : 10-18V.

Current : 600mA typical.

Connectors RF Output Supply & Mod Input: SMA(F), 9 Pin 'D' (M).

Physical Dimensions : 70 x 60 x 25 mm.