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FIELD METERS MCT 080 / 081 / 082 / 085 USER MANUAL
p.
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20 SFN Delay
These measures are available with one of these standards :
DVB-T
In the "Measures-TV-Spectrum" page, press the key
The device displays on this page the measurement of the 'SFN Delay' of the current signal.
The device measures the time between the GPS 1PPS signal and the arrival of the MIP table in the MPEG TS
stream.
Use :
-
connect the GPS antenna to the device
-
connect the TV antenna, choose a channel
-
wait until all indicators are green: GPS, 1PPS, DVB, MIP
-
enter the distance of the transmitter (in a straight line)
-
enter the demodulation time until you obtain the known "Static Delay" measurement
(this "Static Delay" time is set in the "MIP inserter" of each re-transmitter)
-
when the measure '' Static Delay '' is correct, press the '' eraser '': this is the reference point for the '' Drift ''
plot
'' Drift '' = this is the drift in time in μs of the synchronization of the transmitter
Drift monitoring graph of the mesure ‘’Static
Delay’’
Distance between
transmitter and
instrument in meters
Demodulation time of
the internal DVB-T
decoder
Reference reference for
the Drift monitoring
graph