Rx2 Frequency for USA

Hi All,

We are an NYC-area makerspace attempting to setup a TTN gateway (Multitech). We have a few LoRaMOTEs (RN2903) that we are trying to get talking to the gateway. However, we do not see any packets received in the gateway's log.

We are running the following commands to the RN2903:

sys get hweui
sys reset
mac set devaddr 0201FFFA
mac set appskey 2B7E151628AED2A6ABF7158809CF4F3C
mac set nwkskey 2B7E151628AED2A6ABF7158809CF4F3C
mac set adr off
mac set rx2 3 869525000
mac join abp
mac tx uncnf 1 3132333435

The line "mac set rx2 3 869525000" must not be correct, because it requires to specify a USA frequency for the second receive window.

Is this rx2 setting for TTN in the USA documented somewhere??

Thanks!
Chris