Demodulator Specifications
 

Input impedance	200 Kohm
Nominal input level	+16 to -16 dBm (into 600 ohm selectable in 6dB steps)
Maximum level	+30dBm without damage
Dynamic range	Better than 40dB
Input frequency range	1 Hz to 3800 Hz
Mark/Space centre frequency	Selectable from 200 to 3600 Hz in 1 Hz steps
Shift	Selectable from 10 to 1800 Hz in 1 Hz steps
Baud speed	Selectable up to 500 Baud in 0.01 Hz steps
Roofing filter bandwidth	FIR filter automatically adjusted according to selected/measured shiftand baudrate
Post-detection filter	(FSK) automatically adjusted according to selected/measured baudrate
Matched filter bandwidth	(FEK) automatically adjusted according to selected/measured baudrate
Bit error rate	Within 3dB of theory (white gaussian noise, non-fading channel)
Modulation types detected	OOK, BFSK, MFSK, 2DPSK, 4DPSK and commercial 4, 6, 8 and 13 tone FEKdemodulators already implemented, also AM for SAT-FAX. Others on request.

 
 
 

Features of Audio Spectrum Analyzer
 

• 60 dB dynamic range, 512 point resolution frequency display
• 2 Zoomed display facilities. (1800 Hz and 900 Hz), display width of 0 Hzto 3800 Hz.
• Linear and Logarithmic vertical display representation
• Short time-window selectable, Video averaging and Maximum hold
• Waterfall display with vertical or 45 degree skew.

 

 
 
 

• Center frequency 10 Kc, 100 or 200 Kc on request
• 45 dB dynamic range, gain adjustable, 512 point resolution frequency display
• 3 Zoomed display facilities. (1, 5 or 7.5 Kc), display width of 15 Kc.
• Linear and Logarithmic vertical display representation
• Nearly 'Real time' display, Short time-window selectable,
• Waterfall display with vertical or 45 degree skew.