JB Jb-L20 User manual

Jb-L20 Manual
Jb Varios are designed to be small, light, effecve, price sensive and easy to
handle instruments which can be setup without the use of a computer.
This is the Jb-L20.
To turn on the instrument simply Just Press (Jp) for 3 sec. (this to prevent accidental
turning on while off). Jb-L20 tells you that it is ready to fly by producing a short jingle.
www.jbvario.com
Absolute altude above the sea level (adjustable)
Are the maximum ascent and descent recorded while flying. V stands for vercal.
Volume icons: 100% 50% MUTE. / Then we have Unit, can be meters or feet
The altude in relaon to the takeoff. It is set to 0 when you turn on Jb-L20
Then there is a chronometer that starts in the moment you turn on. It can be reset by Btn DOWN
The baery last about 15 hours, when the icon starts to blink you sll
have about 1 hour of flying me remaining.
and
The analogical bar shows the vercal speed. The first black triangle indicates that
you are in a range from 0.1 to 0.9 mt/sec (or /sec) . the first black box is from 1 to
1.9 mt/sec and so on ll 5.9. From 5.9 to 10.9 on the black box is drawn a white trian-
gle. If the vercal speed is 0 no triangle or box is drawn.

Knowing the buons, exploring menus – seng up your Jb-L20.
(Video available on www.jbvario.com)
To prevent accidentally change of status, while in "FLYing MODE" you need a long press on the
buons of about 2.5 seconds to:
• BTN UP --> change the volume HIGH/LOW/MUTE (in a cycle)
• BTN DOWN --> reset the chronometer
• BTN Jp --> Jp stands for Just Press. Is the key buon to turn on the instrument and to
access to the menus, it is used inside the menus to select and confirm.
TO ACCESS THE MENUS
KEEP Jp buon pressed for 2.5 sec. You will be taken in the
First Menu page
PWR OFF switches off the instrument, just aer you confirm by pressing the Jp
buon. Fly Mode takes you back to the Flying mode page. LED is the back-light,
you need to select it with the Jp buon and then change the value to on by the
buon down or up, then you need to confirm with the Jp buon. You can fly with
the back-light on if you like the effect of black on white, but in sunny days it is not
needed, be aware that keeping the LED on decreases the autonomy of the
baery. OLD GUY MODE, if on will change the numbers size in the main screen.
Pressing Jp on seng will take you to the second menu page , SETTING. The
seng you change will be saved in memory.
Regular screen Bigger numbers

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.
• 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

Third Menu page
The first lines are info: Firmware number and serial number, these are not changeable.
• Fly Mode takes you back to the Flying mode page.
• LCD: Allows you to change the contrast of the display. Already set to opmal
contrast, but if you want to adjust it is possible...
• LNG: language, English or Chinese can be set.
• Factory Reset: if you Jp on that, the instrument is reset to factory values.
Charging the Jb-L20
Simply connect the instrument to a micro USB cable… The Jb-L20 will be charged in about
3 hours if the baery is completely flat.

Firmware update
Once the Jb-L20 is connected to the USB cable the charge will start, but by USB is
also possible to update the firmware. To avoid complicaon we created a method
that does not require drivers installaon. That’s the ulity of the buon firmware
update. If you connect Jb-L20 to a Windows 7, the OS will inform you that drivers
are not installed, Windows 10 instead will install drivers automacally, however
we will not use them. Instead we will reenumerate the USB that will be recognized
as USB HID peripheral, thus not requiring drivers.
Press Btn DOWN
Then confirm by Jp buon
When the text on the right will appear you
should read, and press Jp one more me. Don’t
be alarmed if the screen will be empty... The
instrument is just in USB HID mode, ready to
receive the update by USB. Just launch the file
you downloaded from www.jbvario.com. Don’t
disconnect unl you read on the LCD
This message will disappear in few seconds and
then the charging screen will appear again.

Jb-L20 Features
• Weight 84 g
• Size 100mm x 59mm x 17mm
• Lithium polymer special baery usable ll 80 °C. Run me on a full charge =
15 hrs. It charges in 3 hrs using a micro USB cable (the one used for mobile
phones).
• Back-light LED, emits a white light.
• Piezo buzzer with mul-tones and jingles (piezo buzzers are loud and drain
almost no power).
• Sensivity of 0.1 m/sec (0.328 /sec), thanks to the barometric sensor
MS5611-01BA03 by Measurement Speciales, Inc.
• 2 Responsiveness modes, FAST and NORMAL (previously explained).
• Climbing threshold seable starng from negave values. If the climbing
threshold is set to values <=0 a special sound feedback is played.
• 3 Volume levels, seable, HIGH/LOW/MUTE.
• 2 Sound modes seable: Jb CLASSIC and RELAX.
• Durable, Scratch-Resistant Acrylic panel cover the LCD - back light available.
• OLD GUY MODE: if set to on increases the size of the numbers in the main
screen, so you don’t need reading glasses while you are flying.
• All the seng will be stored in memory and will be retained even if the
baery is drained flat or removed.
• Unit of measure seable in meters or feet for the altude and in m/sec or
/sec for the vario
• Factory reset performable. The instrument will be set to volume 100%,
climbing thresholds +0.1 m/sec, sinking thresholds -2 m/sec, sound type
RELAX, responsiveness FAST, unit METERS, Language English.
• Aluminum D shape hook to secure Jb-L20 in a fast way.
• Adhesive Velcro and Velcro strap are provided to set the instrument on the
paraglider risers or wherever you prefer.
Happy flying
Maurizio Romano