Second Menu page
•
alt:
As you probably know the pressure is never constant in the atmosphere. There are
standard theore cal values that the variometer take in to account, but in reality the pressure
at a certain al tude can be different in different moments. Here you can adjust the value of
the al tude. As usual: Jp to select, up or down bu ons to change the value and Jp again to
confirm.
•
upT:
Up Threshold (in meters per seconds or feet per seconds), this is the value for which you
want the Jb-L20 gives you a posi ve audio feedback. It means it will beep for thermals. Some
people want posi ve feedback also for nega ve values: someone wants to have a thermal
beep also for example at -0.3. If you are going down at -0.3 mt/sec you are in a thermal
indeed, because even if you are going down the air is going up. It just happens that your
glider has a minimum sink rate lower than the thermal. However you can put the upT down
to -0.7. Obviously to avoid conflict in case the dwT is set to a higher value it will be automa -
cally adjusted at -0.1 lower than the upT. If the upT is set to values <= 0 it will be produced a
special audio feedback.
•
dwT:
Down Threshold (in meters per seconds or feet per seconds), this is the value for which
you want the Jb-L20 gives you a nega ve audio feedback. It means you are going down.
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vol:
the volume can be set to 100% 50% or MUTE
•
snd:
you can choose between
2 different type of sounds.
RELAX
has a lower frequency.
Jb
CLASSIC
has higher frequency , like the Jb MINI (the previous model without display)
•
res:
RESPONSIVENESS , how fast you want the instrument reacts to thermals and how fast
you want V+ and V- are updated. Responsiveness can be
NORMAL
or
FAST
.
NORMAL
: Will use a filter of 1 second for the first thermal beep feedback. Then the instrument
will give feedback and will be responsive every 0.5 seconds ll the end of the thermal. If the
Jb-L20 doesn’t detect another thermal within 1 second from the last thermal the 1 second
filter will be ac vated again. This is done to cut out temporary “shaking”. This means also that
if you set Jb to +0.1 the first thermal will be detected a er 10 cm of varia on , but the beep
will be produced a er 20 cm... then a er 1 second it will become responsive at 10 cm of
difference, calcula ng varia on every half second. The values V+ and V- will be updated only
if a certain value is confirmed for at least 1 second. If you get a +6 for less than 1 second it will
not be recorded as V+ (max ascent, ver cal speed value). Suitable for students.
FAST
: No filter of 1 second, furthermore another algorithm is used to let Jb-L20 be more sensi ve.
The values V+ and V- are updated immediately. Suitable for pilots with over 100 hrs...
•
unit:
Al tude can be set in
meters
or
feet
, and the variometer can be in mt/sec or /sec