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NT 250 Technical and Maintenance Manual NicomUsa Inc
Page 11
COMPOSITE OPERATION
Composite inputs four total, 1 for MPX and 3 for SCA
MPX input 1 unbalanced bnc connector
MPX input impedance 2 K ohms
MPX input level 3,5 V p-p (1,237 Vrms/3.64 dBm)
Composite FM unweighed S/N ratio > 78 dB below
±
75 Khz deviation at 400 Hz
measured in a 30 Hz - 100Khz bandwidth with
75 usec de-emphasis (RMS)
Composite Total Harmonic Distortion 0.05 % typical
Composite Intermodulation Distortion 0.05 %, measured with a 1 Khz and a 1.3 Khz
tone, 1:1 ratio, at 100% modulation
Baseband 30 Hz - 60 Khz within 0.15 dB
Crosstalk main to stereo subchannel and stereo subchannel
to main > 55 dB ( 60 dB typical)
SCA Inputs 3 unbalanced BNC connectors
SCA Input Impedance 10 K Ohms
SCA Input Levels 0 dBm (775 mV rms/ 2.2 V p-p) nominal for
±
75 Khz deviation, adjustable
SCA Amplitude Response
±
0.8 dB, 40 Khz to 100 Khz
Crosstalk 67 Khz SCA to main or to stereo subchannel >65dB
92 Khz SCA to main or to stereo subchannel >70 dB
MONOAURAL OPERATION
Audio Input Impedance 600 Ohms balanced or unbalanced; 50 dB common
mode suppression
Audio Input Level 0 dBm (775 mV rms/ 2.2 V p-p) nominal for
±
75 Khz deviation, adjustable
FM S/N Ratio
> 70 dB below
±
75 Khz deviation at 400 Hz
measured in a 30 Hz - 20Khz bandwidth with
75 usec de-emphasis (RMS)
Audio Frequency Response
±
0.8 dB, 30 Hz to 15 Khz
Intermodulation Distortion
0.05 %, measured with a 1 Khz and a 1.3 Khz
tone, 1:1 ratio, at 100% modulation