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M4v2 Radio Options

Red_Top_callout1920

Currently the M4v2 offers several options for internal or external radio receivers.
After selecting a different radio you always need to store it and restart the M4!

Please also read the general Radio Options for AQ.

First Option – internal Receivers

The AQ M4v2 (production version r6) has an internal CYRF6936 based DSM2/DSMX 12 channel transceiver.
You can bind and use Spektrum DSM compatible transmitters. To use the internal CYRF receiver you need to select it in QGC´s “Config” tab, “Radio & Controls”, upper dropdown list (RC1).

Note: There have been reports that some Spektrum radios will not work with the CYRF chip on the M4v2, especially older 4 channel radios like the DX4 or the MLPxDSM series with X10EMTX transmitter module will not function properly.
Anyway it´s advised to use at least a 6 channel Spektrum radio to make use of the M4´s autonomous functions.

 


Preparations for using the internal CYRF Receiver on M4v2 Production Boards

In order to power the internal receiver (and only then!) you need to close the solder bridge next to arm nr. 2 like shown belowm4v2-radio-solder-jumper

Selecting the CYRF Receiver on the M4v2 Production Boards

To use the internal CYRF receiver you need to select it in QGC´s “Config” tab, “Radio & Controls”, upper dropdown list (RC1). On the M4v2 (Production Board) the binding process will be signalled by the yellow Debug LED.

cyrf-rc1

After selecting a different radio you always need to store it and restart the M4!

Connect the Receiver Antenna with u.fl Connector

M4v2-ufl-connector

Binding the onboard CYRF receiver with Spektrum compatible Transmitters

M4_v2_CYRF-LED

After you power the board, the receiver will go into bind mode after 16-20 sec., indicating this status by flickering the yellow debug LED.

As soon as the flickering starts, switch on your radio in binding mode and wait until the LED goes solid.

Note: If you are facing problems binding your internal receiver you could try one of the following:
– bring some distance between the transmitter and receiver. If they are too close together they might fail binding. 2 or 3 meters should be sufficient.
– remove the pigtail antenna before you start the binding process. After successful binding you can plug it in again.

Check in QGC in the “Config -> Radio & Controls”, if all channels are assigned correctly and if the directions are ok.

M4v2-radio-selection-parameter-list

Read more about binding the internal CYRF receiver on M4v2 production boards in this forum thread

Check your Pitch Stick

The Pitch channel often needs to be reversed. In QGC pitch stick forward (nose down) is negative pitch and therefor the bar graph goes to the left. So if you pull the pitch stick (positive pitch) the graph has to go to the right.

 


Other Options – using external Receivers

You could use external DSM2 Spektrum compatible receivers from Orange (HobbyKing) or LemonRX DSM2 or DSMX.
You can also use external PPM receivers on the same pads.

Please also read the general Radio Options for AQ.

radio-selection

 

RC2-radio-settings

Note: Power output on the M4 radio connection pads is 3.3V/50mA max. This is enough to drive a Spektrum satellite and other low current 3.3V receivers. But alternatively, you may need an external 5V step-up voltage regulator, e.g. Pololu U1V10F5 if using a receiver that requires a 5V supply. This stepup can be connected to +Vcom and GND on the expansion headers. Refer to the M4 expansion board section for details (Insert link)

ext-radio-pads

deltang-radio-settings

Other Options for external Receivers

LemonRX DSM2 Spektrum compatible satellite
lemonrx-dsm2-satellite
Orange DSM2 Spektrum compatible satellite
orange-dsm2
Hitec compatible Minima PPM receiver
minima5-ppm-receiver
Other receivers like Simprop Gigascan Satellite for Futaba
smp-0123455
FrSky D4R-II PPM receiver

Modification example to attach step-up regulator
& make it lighter
FrSky X4R S.Bus receiver

Modification to bypass the S.Bus inverter
for direct connection to AQ.
This page was created on 5-Aug-14 by kinderkram. Last modified on 23-Jul-15 by kinderkram.