Operating instructions

OPERATING MANUAL 2945A
46882-311D 1-11
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)
Audio filters 300 Hz Lowpass
300 Hz Highpass
3 kHz Lowpass
300 Hz to 3.4 kHz Bandpass
15 kHz Lowpass
750 µs de-emphasis
Amplitude Modulation
Frequency Range 100 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
Resolution 1% AM
Indication 2 digits and barchart
Accuracy † ± 5% ±1 digit at 1 kHz
± 8.5% ±1 digit from 50 Hz to 10 kHz
Demodulation Distortion † Less than 2 %, at 1 kHz & 30% AM, (CCITT Weighted)
Residual AM Less than 1 % (300 Hz to 3.4 kHz)
Frequency Modulation
Frequency Range 100 kHz to 1.05 GHz
Modulation Frequency Range 10 Hz to 15 kHz
Deviation Range 0 to 75 kHz
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 for modulation frequencies 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
(de-emphasis function available)
200 mV peak to peak ±10 % per 1 kHz deviation
† At low modulation levels the residual AM / FM may become significant
RF spectrum analyzer
Frequency Range 100 kHz to 1.0 GHz
Spans Continuously variable,
1 kHz / division to 100 MHz / division.
1,2,5,10 increments.
Start / Stop frequency entry.
Resolution Bandwidth 300 Hz, 3, 30, 300 kHz, 3 MHz
Reference Level (top of screen) −50 dBm to +52 dBm
On screen dynamic range 80 dB
On Screen Linearity Typically ± 2 dB ±resolution (10 dB/div)
(10 dB above the noise floor)
Vertical resolution 0.1 dB on 2 dB / division
0.5 dB on 10 dB / division
Level Flatness ± 1 dB ±resolution over 50 MHz span