Settings Guide

How to get into the transmitter settings menu

1. Start the Google Chrome configurator. (download it here)

2. Connect your transmitter to the computer as shown in the Connection Guide.

3. The configurator should auto-connect to the transmitter and open the settings page.

How to get into the receiver settings menu

Note that RX settings are done wirelessly. Your receiver does not need to be connected to the computer to adjust settings. No PWM or PPM will be output by the RX while in configuration mode.

1. Connect to the transmitter as above and ensure you are in the transmitter settings tab.

2. Click on the RX settings tab. Apply power to the RX during the timeout period. This can be done by applying power as normal to the airplane or helicopter.

3. The configurator should auto-connect to the receiver and open the settings page.

Transmitter settings

These settings are set on the transmitter and sent to the receiver during bind. You must rebind after changing any of these settings.

RFM Type

Select the frequency of the RF module on your device. Most units are 433.

Operating frequency

The lowest frequency of the frequency range you are transmitting.

RF Power

The output power setting of the transmitter. 0 is the lowest and 7 is the highest. The receiver will use the same power setting if telemetry is enabled.

Channel spacing

The amount of frequency between each channel.

Serial baudrate

The connection speed of the serial link if you are using the transparent serial link. This is only the connection speed, which will depend on the devices that you are connecting to. The rate that data can be sent will probably be much lower.

Data rate

The rate that data is sent between the transmitter and receiver. Lower numbers mean slightly improved range at the cost of servo refresh rate.

Enable telemetry

Enable the telemetry link from the receiver. The transmitter will beep if the receiver experiences packet loss. Also, the transparent serial bridge will be available. The FrSky option will enable FrSky telemetry output on the transmitter for connection to OpenTX or FLD-02.

Bind code

The randomly-generated ID of your transmitter. If this reads DEADFEED, you need to randomize the information on your transmitter. Valid characters are hexadecimal (0-9, A-F)

RC output configuration (channels)

Select the number of channels that will be sent to the receiver. This is also the number of channels that will appear on the receiver’s PPM output. Additional channels sent to the transmitter will be ignored. Example: if the transmitter is set to 8 channels, and you controller is set to 12 channels, only the first 8 channels will be sent to the receiver. The “Switch” channels are channels with very low resolution - only 4 positions; however they take 1/5th of the time to transmit, increasing the number of useful channels for a certain refresh rate.

Number of hop channels

This will allow you to set the number of hopping channels.

Maximum desired frequency

Set the maximum frequency you want to transmit on. All the hopping channels will be placed below this frequency.

Receiver Settings

These settings are set on each individual RX and stored in the RX's memory. The RX will keep these settings until they are changed or erased during a software update.

PPM output is available on one pin. It can be enabled by setting the correct Port to output PPM. High-frequency RSSI / LBEEP is also available on one pin and is enabled the same way.

Minimum PPM sync time

The minimum time between PPM frames on the PPM output. The default value works fine for many systems but fickle systems such as Ardupilot require a longer sync time.

Inject RSSI on servo channel

The RSSI signal is turned into an output that can drive a servo and injected into the PPM stream, replacing the RC channel of your choice. This channel can then be mapped to an output port.

Always bind on startup

By default, the receiver always listens for a bind message for a moment when power is applied. If this feature is disabled, you must jumper ports 1 and 2 to force the RX into bind mode on startup.

Limit PPM out to 8 channels

Some devices that accept PPM are also picky about the number of PPM channels that are in a PPM frame. This option is used to only output the first 8 channels in the PPM stream regardless of the number of channels sent to the receiver.

Enable slave mode

This option is for a future multi-RX diversity mode. Don't use it for now.

Failsafe delay

The amount of time after the last packet is received before the receiver will load failsafe values. This can be used to “fly through failsafes” and can be adjusted to your liking. This value is in 1/10ths of a second.

Stop PWM on failsafe

Completely disable PWM outputs on failsafe.

Stop PPM on failsafe

Completely disable PPM outputs on failsafe.

Beacon frequency

If this option is enabled a tone is transmitted on the selected frequency that can be picked up using a common FRS, PMR or amateur radio walkie-talkie to aid finding a lost airplane or helicopter. Five tones are sent of descending transmit power to help you zero in on its location. The beacon is sent after failsafe has been activated.

Beacon interval

The amount of time the beacon will idle between transmit sequences.

Beacon deadtime

The amount of time after failsafe has been enabled before the beacon starts.

Channel Output

Set the outputs for each port in this menu.

RSSI modes

There are four different RSSI modes available in openLRSng. That's a lot!

High-frequency RSSI pulse

An 8kHz PWM signal is available on one pin. It is varied between 0-100% duty cycle to indicate RSSI.

Analogue RSSI 0-3.3 volts

The high-frequency signal above can be filtered to produce an analogue signal. On DTF UHF 4-channel receivers V2 and newer, the filter is on-board and can be enabled by soldering a jumper as seen in the Hardware Guide. An external filter can be made with a capacitor and resistor.

LBEEP Audio Beep mode

This will output a beep on a lost radio packet that continues until a valid packet is received. This output can be connected directly to the audio input of a video transmitter. Thus, instant audio feedback of the radio link quality is enabled.

RSSI Injection

A RC servo channel can be replaced with RSSI information, and set to an output port to drive a servo or OSD with 50kHz servo-pwm. Note that this injection will replace that servo channel, or you can map this to an additional RC channel when in 8- or 12-channel mode, so RSSI will be on channel 9 or 13 and not overwrite a PPM channel you are using.