974-72007001/1.0 1007D Altimeter Operators Manual
Page 28 Telemetr
Kongsberg Mesotech Ltd.
Port Coquitlam, BC - Canada
'P'x – Set Transmit Pulse Width
where x = '0'…'9' corresponding to pulse lengths of
(x+1)*50s. The operator must be aware that a pulse
width setting can be made to exceed the acoustic time
corresponding to the current minimum range. Care
should be taken when selecting pulse lengths near the
minimum range setting since the actual transmit pulse
may be detected as the altitude 'return' value. Make
sure the minimum range value is set sufficiently
larger than transmit pulse length.
'Q'xxxxx – Set Maximum Resolution
This command sets the maximum resolution in
samples in acquiring maximum range, where xxxxx is
a 5 ASCII digit (with leading zeros as required) value
in '00238'…'16000'. The altimeter will then attempt
to sample the received acoustic signal at a rate Fs:
Fs = Maximum Resolution in samples / maximum
range acoustic time
At short ranges the actual resolution used may be less
than xxxxx to limit Fs to the altimeter's maximum
allowed sample rate (307.2 kHz). The actual value
used can be determined using the QUERY command
string '-Q', which returns 'Qxxxxx' where xxxxx is the
actual resolution in samples currently used (instead of
the maximum resolution). See the note under the '-x'
command above regarding sending the query after the
1007D restarts pinging.
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