I-CUBE-LRWAN: how to turn on continuous Tx mode

[algis]

Posted on March 09, 2018 at 09:15

Hello,

I am using the I-CUBE-LRWAN V1.1.4 with CMWX1ZZABZ-078 and I want to test the continuous TX mode in order to check the EMC tests. Can somebody give some idea on how to do that?

#continuous-tx #cmwx1zzabz-078 #i-cube-lrwan

[Remco Groenendaal · Accepted solution]

Posted on March 14, 2018 at 16:52

Hi, a simple way one could do that would be to put the device in certification mode by sending a downlink with 01010101 to port 224 (start certification mode). Once in certification mode it will do an uplink once every 5 seconds. Sending a downlink containing 07000A to port 224 will put the device in continuous tx mode for 10 seconds (0x0A) using the last frequency and rf power. 

Sending a longer command like 07000A84724014 to port 224 will activate 10 second transmission on 868.0 mHz (0x847240) at 20dBm (0x14).

To switch back to your application send 00 to port 224.

Best regards,

RG

[algis]

Posted on March 23, 2018 at 13:20

Hi, thank you for the explanation. Can you also elaborate on bandwidth? If I turn on continuous TX mode the used bandwidth is around 10kHz. Do you know why? How to set it to default 125kHz? I have to accept that I cant find the bandwidth definition, only is DR which seems to be linked.

[Remco Groenendaal]

Posted on March 26, 2018 at 11:48

Hi Krupta, you're welcome! If you need more control over your continuous tx, perhaps it would be easier to configure the radio manually. Semtech's Miguel Luis posted an example as a comment

https://github.com/Lora-net/LoRaMac-node/issues/65

. The semtech LoRaMAC-node repo also contains code examples for setting Tx-Cw, see this

https://github.com/Lora-net/LoRaMac-node/tree/master/src/apps/tx-cw

.