Board receives BPSK, DBSK, and QPSK signals
The STEL-9230 digital PSK demodulator performs PBSK, coherent DBSK, and
QPSK demodulation. Measuring 5 x 6.5 in., the board accepts an input
centered at 70 MHz while an AGC provides 30 dB of dynamic range with a
minimum signal level of -50 dBm. A fixed frequency translates the signal
to a lower intermediate frequency where it is digitized. All demodulation
is performed with digital logic with a microcontroller managing the
acquisition process and performing lock detection. The board can be
configured to demodulate data ranging from 9.6 to 256 Kbits/s in BPSK mode
and 19.2 to 512 Kbits/s in QPSK mode. Carrier-frequency uncertainty can
range up to 50 kHz. Information is transferred via an RS-232 port. ($4,
300–stock to 3 days.) Stanford Telecom, Sunnyvale, CA Customer Service
408-541-9031
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