Specifications

Channel Master Operation Manual
P/N 95B-6001-00 (February 2006) page 89
10.10.2 Expert Level Vertical Beam Command Descriptions
The following expert commands define the criteria used to set the Vertical
Beam data.
#VC – Detection Filter, Pressure & Range Screening Control
Purpose 1. Controls the surface detection filter that is applied to aver-
age RSSI data.
2. Controls whether the pressure sensor will be used as a first
guess in detecting the surface.
3. Controls the percent of range used in screening pings within
a burst.
Format #VC m p rrr
Range m = 0 to 2
p = 0 or 1
rrr = 0 to 100 %
Default #VC 0 0 25
Recommended Setting. The default setting for this command is
recommended for most applications.
Description: See below.
If m = 0, the ‘W’ filter is used on average data. If m = 1, the
leading edge filter is used on average data. If m = 2, the ‘W’
filter and then the leading edge filter is used on average data.
If p = 0, then the pressure sensor is not used. If p = 1, then the
pressure sensor is used. Using the pressure sensor can reduce
ping time and avoid false detection. Set the #VS command to
1 or 2 sub-pings for an improved ping rate if the pressure sen-
sor is used.
The value set by the rrr digits determines the allowable differ-
ence of individual pings’ range from the average range over a
burst. The allowable difference is ±rrr, so the window is
twice rrr. Screening the individual pings in this way is an ef-
fective means of avoiding false detection.
NOTE. For information on other expert level vertical beam commands, see
FST-006 (available for download on www.rdinstruments.com
) or contact
Teledyne RDI (see “Technical Support,” page 137).