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                           BULLETIN
FSB-119 - RECOMMENDED WB & WV SETTINGS IN BROADBAND AND WORKHORSE
                    DATE/REV:  01SEP98 / 0
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SPECIAL NOTE:  THIS FSB SUPERCEDES ALL PREVIOUS DOCUMENTATION
RELATED TO THE WB AND WV COMMANDS. THIS INCLUDES ALL PREVIOUS
TECHNICAL MANUALS AND FSA-003.

ABSTRACT: A firmware error in Broadband (v5.xx; v4.xx), Workhorse
Monitor/Sentinel (v8.xx), and Workhorse Navigator/DVL (v9.xx with
the Water Profiling feature) systems may cause invalid data
depending on WB and WV command settings.

INSTRUMENT/PROGRAM AFFECTED:  All Broadband (BB) and Workhorse
(WH) systems. This currently affects BB firmware v4.xx and v5.53
(and earlier), Workhorse Monitor/Sentinel firmware v8.23 and
earlier, and Workhorse Navigator/DVL firmware v9.09 (with water
profiling feature) and earlier.

DESCRIPTION:  Internal processing errors in the firmware listed
above will cause invalid output data if the WB and WV commands
are set to certain "out-of-tolerance" values.

The WV command (ambiguity velocity setting) sets the maximum
velocity that can be measured along the beam when operating in
water mode 1 (WM1). WV is used to improve the single-ping
standard deviation. The lower the value of WV, the lower the
single-ping standard deviation.

The WB command influences profiling range. If you narrow the
bandwidth of the system, the profiling range is increased. An
increase in range of approximately 10% is obtained each time the
bandwidth is reduced by one-half.

You are required to set the WV command based on the maximum
apparent velocity (ADCP motion plus water speed). The following
formula is used to determine the setting of the WV command:

  WV = (Max. Apparent Vel. cm/s) * sin(beam angle) * 1.2

Note that the minimum setting of the WV command is WV100 and
the maximum setting due to internal processing limitations is
limited based on the setting of the bandwidth command, WB.

SOLUTION/ACTION:

Short-Term:  Valid data can be collected if the following WV
values are not exceeded. The maximum WV values depend on the WB
setting as listed below. Be aware that the firmware will accept
larger values for the WV command; however, WV values that exceed
the following values will result in collecting data with
ambiguity resolving errors or completely erroneous values.

   BROADBAND PHASE 3 (v4.xx and v5.53 and earlier)
   ========================================================
                               Apparent Velocity (max cm/s)
   WB  Bandwidth  WV(max cm/s)  20-deg ADCP    30-deg ADCP
   --  ---------  ------------ ----------------------------
   0      25%        700           1,705           1,166
   1      12%        330             804             550
   2       3%        165             402             275

   WORKHORSE MONITOR/SENTINEL (v8.23 and earlier) AND
   WORKHORSE NAVIGATOR (v9.09 and earlier)
   ========================================================
                               Apparent Velocity (max cm/s)
   WB  Bandwidth  WV(max cm/s)  20-deg ADCP    30-deg ADCP
   --  ---------  ------------ ----------------------------
   0      25%        700           1,705           1,166
   1      12%        330             804             550

Long-Term:  We are working to correct this firmware error. When
a solution has been found, we will announce it on our web site
and in our newsletter.

We apologize for the inconvenience this may cause you.

SPECIAL NOTE:  THIS FSB SUPERCEDES ALL PREVIOUS DOCUMENTATION
RELATED TO THE WB AND WV COMMANDS. THIS INCLUDES ALL PREVIOUS
TECHNICAL MANUALS AND FSA-003.
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