GSSI SIR 30, Manual

Page: 48 / 150

Geophysical Survey Systems, Inc. SIR® 30
Manual
MN 93-101 Rev E 42
Figure 62: Signal Process
SIGNAL PROCESS > GAIN
Gain is signal amplification used to counteract the natural effects of attenuation of the transmitted signal as
it propagates in the media. The SIR 30 allows the user to apply a Time Variable Gain (TVG) function to
the radar signal. Gain may be applied between 1-8 evenly spaced locations along the selected time range.
If one gain point is used, it will be located at the zero (0) ns position. Possible values for each gain point
range from -42 to +126 dB. Because the SIR 30 collects raw data, the User cannot clip the data by
applying too much gain during data collection. The gain applied by the User during data collection is for
display purposes only. The RADAN-7 *.DZT file is stored with no gain applied.
Note:
When setting up the system for data collection GSSI recommends that the Vertical and Horizontal
filter settings be set prior to setting the signal gain. GSSI also recommends that the transform applied to
the selected line scan color table be linear.
Figure 63: Gain menu.