Vario
(Menu/Timers-Sensors/Vario)
The Vario menu is primarily intended for use with the Mvario EX or Mvario2 EX telemetry sensors. Therefore, it is recommended to first install the vario sensor in your model.
General Notice:
The vario sensor is a highly sensitive air pressure sensor. Air pressure inside the model’s fuselage can vary not only with altitude but also with airspeed or motor activation. To ensure accurate readings, place the sensor in a location where these disturbances are minimized.
Sensor Type Selection:
- Off: Vario functions are disabled.
- JB Profi Alarm: For older sensors that do not support the EX protocol.
- EX Value: Recommended option for EX sensors.
- Lua: For using the sensor within LUA applications.
Settings for Recommended Mode by “EX Value”:
Switch:
You can assign a 2- or 3-position receiver switch to control the vario function. Each switch position can be set to Active or Inactive. The current switch position is shown in the lower-left corner.
Tip: If the vario is active in multiple positions, you can assign different settings to each one individually.
EX Parameter:
The transmitter will display all available telemetry values in the current model. The recommended choice is Vario, but any available telemetry data can be selected. For example, choosing RPM or Rel. Altitude will produce sound feedback for motor RPM or relative altitude changes, respectively.
Dead Zone:
This defines a neutral range (both positive and negative) around zero where no audio signal is generated.
- Low values make the vario overly sensitive.
- High values prevent detection of weak lift or sink.
- The negative value (descent) should be higher than the model’s natural sink rate.
- The positive value is typically in the range of 0.2 – 0.3 m/s for most models.
Tip: If you set a much higher negative dead zone and a standard positive one, the vario will only signal climb, avoiding distraction from descent sounds.
Range:
Sets the measurement range for maximum and minimum vario values. These should match the expected range for your model.
- A typical setting is ±5 m/s for most gliders and electric models.
Tip: To the left of the vario bar graph, the actual measured value is displayed as a number.
Voice Output
(Menu/Timers-Sensors/Voice Output)
The Duplex system allows all relevant information and telemetry values to be not only displayed on the screen, but also announced by voice using the built-in speaker or headphones. This significantly improves pilot awareness while maintaining focus on the model. In the “Voice Output” menu, you can select which data will be announced and under what conditions. The menu is divided into voice output for timers and for telemetry.
Voice Output for “Timer”
- Select the timer for which the current time should be announced.
Note: At least one timer must be created first in “Menu/Timers-Sensors/Timers”.
- Set the switch that will trigger the announcement.
Tip: The “Switch” does not have to be a transmitter control — it can also be based on the transmitter’s detected position via accelerometer, any telemetry value, a voice command, etc.
- If the selected timer is of the “Laps” type, a second line “Announce previous lap” will appear automatically. When enabled, the time of the previous lap will also be announced for comparison.
Voice Output for “Telemetry”
- Repeat Every: Sets the interval for repeated announcements.
- Switch: Selects the control (or as per the tip above) that will trigger the loop of repeated announcements.
- Instant Announcement Trigger: When the assigned control (or per the tip above) is activated, the selected announcements in the “Sensors, Variables/Trigger” section will be played once.
Sensors, Variables
This menu is for selecting both repeated and single announcements.
- Sensor: Name of the available parameters for the current model.
- Repeat: Column to select repeated announcements (based on “Repeat Every”).
- Trigger: Column to select single announcements (based on “Instant Announcement Trigger”).
- Priority: Sets the order of the announcements in the queue. If multiple selected announcements have the same value, they will be sorted and played in the order listed in the “Sensor” column.
Sensors/Logging Setup
(Menu/Timers – Sensors/Sensors - Logging Setup)
This menu lists the sensors installed in the model and allows configuration of data logging from these sensors to the transmitter’s memory, as well as unit conversions. Data is stored in the “Log” directory, organized by year-month-day. Each flight day has its own folder, within which the individual flights for each model are sorted by time. You can analyze and view the data either on a PC using the free JETI Studio software or directly in the transmitter via “Menu/Applications/Data Analysis”.
Description of the Bottom Toolbar:
- F1 “Auto”: After adding, removing, or replacing any telemetry sensor, pressing F1 will reload and display all active sensors in the model.
Tip: The sensor detection process may take some time. Completion can be identified when the number shown at the F3 position stops increasing. - F3: Displays the number of telemetry values loaded from each sensor.
- F4: Deletes the currently highlighted telemetry parameter.
Receiver Voltage, Antenna Signal:
Enables or disables logging of receiver voltage and 2.4GHz antenna signal strength to the transmitter's memory.
Transmitter Status Information:
- Log Alarms and Messages: Enables/disables logging of Duplex system alarms and warnings in the flight record.
Recommended setting: “Yes” - Control Inputs Logging: You can assign up to four transmitter controls to this function. The positions of the assigned controls will be logged in the flight data.
Tip: If you assign all four stick axes, you can monitor stick movements in the flight log — i.e., how the pilot controlled the model. Assigning a switch will insert a marker into the flight record when toggled, useful for marking significant flight events.
Unit Conversion:
Each telemetry parameter has a unit listed. You can change the units by highlighting the parameter and turning the rotary selector. The selected units will also be used by the transmitter's voice synthesizer and on the main screen.
Data Logging Toggle:
Each parameter has a “Yes/No” option. If set to “No”, that parameter will not be saved to the flight log.
Tip: The transmitter’s memory has enough capacity to store a large amount of data. Even when logging all parameters from all flights, it is more than sufficient. However, it is good practice to delete old, unnecessary logs from the “Log” directory at the end of the flying season.
Displayed Telemetry
(Menu/Timers - Sensors/Displayed Telemetry)
The basic main screen contains, in addition to the top and bottom status bars, a window displaying the model name. Users can add custom windows with selected data to the main screen.
- Windows can be formatted as a quarter or an eighth of the screen.
- Each model can display different information.
- If the selected values do not fit on a single screen, the system will automatically create additional screens as needed. Navigation between screens is done using the F2 and F3 buttons in the bottom bar.
- If flight modes are created for the model, each flight mode can have its own screen with different information.
Selecting Information for Display
S or G symbol: If the model does not use flight modes, the symbol G is displayed. If it does, G (Global) can be switched to S (separately). This allows each flight mode to have a separately configured screen. In that case, the screen is configured for the currently active flight mode.
Telemetry: Select the information to be displayed on the model screen. The transmitter offers two groups of sources:
- System: Allows selection of system values such as current flight mode, transmitter and receiver battery voltage, signal strength of individual antennas, user name, virtual Jetibox functionality, flight timers, trim positions, and the model image.
- Telemetry: Select from values provided by all sensors connected to the current model.
Double: Each value can be displayed in either large format (one-quarter screen) or small format (one-eighth screen).
Tip: Large-format display often allows more information to be shown. In the example, current consumption is displayed in larger text, while the minimum and maximum current during the flight are shown in smaller text.
Tip: Individual telemetry items are displayed on the screen in the order they appear in the “Displayed Telemetry” menu. You can change their order—and therefore the layout—using the F1 and F2 buttons in the same menu.