Carrier monitoring
This web page links to files of carriers monitored using Spectrum Analysis techniques.
System Set-up for Carrier Monitoring
see diagram below for the hardware set-up. During carrier monitoring, the cassette deck is in the record (or record standby) mode, and the record level control is used to set the noise floor on the spectral display to approximately -60dB.
spectrum Lab settings - FFT Settings:
FFT Sample Rate Divisor - 64
FFT Input Size ("length") 8192
- resolution 00.0421 Hz
- band 0913.87-1086.13 Hz
FFT Type:
Complex input with frequency shift centre frequency 1000.0 Hz
FFT Output:
Logarithmic (converted to dB)
Spectrum Lab Settings - Spectrum Display
Amplitude grid
Optimum waterfall average
Peak detecting cursor
Waterfall scroll interval 15 sec
Smooth scroll
Buffered graphics
With these settings, audio is readable when the Carrier to Noise Ratio (CNR) is greater than approximately 50-60 dB
More details of this technique may be found on Mark Hattam's website
Carrier Monitoring on 580kHz
For details, click on the links below, and use the back button on your browser to return to this page:
30 Jan 04 : 1 Feb 04 : 2 Feb 04
