Operating instructions

GENERAL INFORMATION
1-12
Modulation Meter
Sensitivity Autotuned: 5 mW (N-Type) 0.05 mW BNC (antenna port)
Manual Tuned: −34 dBm (N-Type) −60 dBm BNC (antenna port)
Auto or manual control of input attenuator
Audio Filters
Lowpass Filters Four independently configurable Lowpass filters LP1, LP2, LP3,
LP4 that can be set to any frequency cut-off point from 250 Hz
to 20,000 Hz (excluding the band 1001 to 2999 Hz).
A 50 kHz Lowpass (No filters applied).
750 µs de-emphasis.
Highpass Filters 50 Hz Highpass
300 Hz Highpass
Bandpass Filters Any combination of LP1, LP2, LP3, LP4 and the Highpass filters.
Amplitude Modulation
Frequency Range 400 kHz to 1.05 GHz
Modulation Frequency Range 10 Hz to 15 kHz
AM Depth Range
0 to 99 % (manually tuned)
0 to 90 % below 100 MHz
0 to 80 % from 100 to 400 MHz
Peak hold facility
Resolution 1% AM
Indication 2 digits and barchart
Accuracy † ± 5% ±1 digit at 1 kHz
± 8.5% ±1 digit 50 Hz to 10 kHz
Demodulation distortion Less than 2 % at 1 kHz and 30 % AM (CCITT weighted)
Residual AM Less than 1 % (300 Hz to 3.4 kHz)
Frequency Modulation
Frequency Range 400 kHz to 1.05 GHz
Modulation Frequency Range 10 Hz to 15 kHz
Deviation Range 0 to 75 kHz peak
Resolution 10 Hz below 2 kHz deviation,
1% above 2 kHz deviation
Indication 3 digits and barchart
Accuracy †
± 5 % ±resolution at 1 kHz modulation frequency
± 7.5% ±resolution 50 Hz to 10 kHz
Demodulation distortion Less than 2 % at 1 kHz and 5 kHz FM (CCITT weighted)
Residual FM Less than 30 Hz (300 Hz to 3.4 kHz)
Demodulation Output Socket 200 mV peak to peak ±10 % per 1 kHz deviation
† At low modulation levels the residual AM / FM may become significant