Please, I'm working with data from this EM system and need this information. Does anyone have the central time channels values of QUESTEM-450?
Thank you!
The channel definitions depend on the base-frequency and also changed slightly between surveys. Here are the definitions for a 25 Hz survey from a 1998 survey near Jacobina, Bahia (15 off-time channels):
56 57 (start, end sample; range from 0-255 over 20 ms, ie 56=57/256*20ms)
58 59
60 61
62 65
66 69
70 75
76 81
82 89
90 99
100 113
114 131
132 153
154 181
182 215
216 255
Hope that helps!
Cheers,
Daniel
Yeah! This is exactly what I want! Thanks!
However, I also got these values (attached) with CGG guys, which refer to the 25Hz base frequency for this exactly survey. It is pretty much the same thing.
Thank you again!
Cheers,
Marco.
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