# RN2903 with US902-928

**URL:** <https://www.thethingsnetwork.org/forum/t/rn2903-with-us902-928/32443>\
**Category:** Frequency Plan\
**Created:** [December 6, 2019, 5:07pm UTC](https://www.thethingsnetwork.org/forum/t/rn2903-with-us902-928/32443 "2019-12-06T17:07:01Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![thingdust](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/thingdust/32/25844_2.png) [@thingdust](https://www.thethingsnetwork.org/forum/u/thingdust)\
**Post date:** [December 6, 2019, 5:07pm UTC](https://www.thethingsnetwork.org/forum/t/rn2903-with-us902-928/32443/1 "2019-12-06T17:07:01Z")

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Hi all

I try to make the RN2903 work with the US902-928 frequency band.

Am I right that the RN2903 supports only the frequencies 902.30 to 903.58 and 915.00 to 915.96.

The default frequency table in [http://ww1.microchip.com/downloads/en/DeviceDoc/RN2903%20LoRa%20Technology%20Module%20Command%20Reference%20User%20Guide-40001811B.pdf](http://ww1.microchip.com/downloads/en/DeviceDoc/RN2903%20LoRa%20Technology%20Module%20Command%20Reference%20User%20Guide-40001811B.pdf) on page 36 seems to suggest that.  
The frequency also cannot be chosen freely in the RN2903.

The US902-928 frequency plan on TTN uses 903.9 through 904.6.

Is it even possible to use the RN2903 on the TTN network? It seems to be not the case, or am I missing something?

Thank you for your help.  
Adrian

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**Author:** ![kersing](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/kersing/32/44777_2.png) [@kersing](https://www.thethingsnetwork.org/forum/u/kersing)\
**Post date:** [December 6, 2019, 7:06pm UTC](https://www.thethingsnetwork.org/forum/t/rn2903-with-us902-928/32443/2 "2019-12-06T19:06:58Z")

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> [@thingdust](#):
>
> It seems to be not the case

That would be surprising as the TTN Kickstarter hardware for the USA was build using the RN2903. May-be you could take a look at the sources for the TTN node (available at [GitHub](https://github.com/TheThingsNetwork/arduino-device-lib)) to check how things can be done?

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**Author:** ![jreiss](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/jreiss/32/46529_2.png) [@jreiss](https://www.thethingsnetwork.org/forum/u/jreiss)\
**Post date:** [December 6, 2019, 8:16pm UTC](https://www.thethingsnetwork.org/forum/t/rn2903-with-us902-928/32443/3 "2019-12-06T20:16:21Z")

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It should be 200k uplink channel spacing for 125k (DR0-DR3). The guide has 20k listed, this is a typo.  
The 500k (DR4) channels have 1.6 MHz spacing

The document specifically lists the range as 902300000 to 914900000 in Hz on that same page.

These match the specification of US902-928.  
[https://lora-alliance.org/resource-hub/lorawanr-regional-parameters-v103reva](https://lora-alliance.org/resource-hub/lorawanr-regional-parameters-v103reva)

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**Author:** ![thingdust](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/thingdust/32/25844_2.png) [@thingdust](https://www.thethingsnetwork.org/forum/u/thingdust)\
**Post date:** [December 7, 2019, 11:30am UTC](https://www.thethingsnetwork.org/forum/t/rn2903-with-us902-928/32443/4 "2019-12-07T11:30:47Z")

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Thank you very much for your quick help.

Yeah the typo did confuse me 🙂  
I have it all working now (the github repo is also quite useful, thanks).

The australia guide has the same typo by the way.