QPSK Modem


The narrow band QPSK satellite modem receives/transmits, voice/data on the required IF frequencies (45MHz, 70MHz &140MHz) with variable data rates. This modem has LCD display, keypad interfaces for user interface, and LED's for status indication. It consists of voice codec, FPGA, IF modulator and de-modulator circuits to implement the given features.

Features:
Data Rate 2.88kbps to 19,2 Kpbs
Modulation BPSK/QPSK
FEC 1/2rate Convolution/viterbi
High Stability Internal Reference One pulse Position Modulation(PPM)
Power Supply 5V DC ± 10%
IF Output Connector SMA Jack
Telephone Interface RJ 9 /11
Data Interface RS232
Eb/No 6dB
Temperature 0 to 50°C
Dimensions 150 X 125mm

Communications Systems