Help with mhz (908.4 or 868.4)?


(Sultan Alkaabi) #1

Dear all,

I would like to buy wall switch and I can’t choose between 868.4 MHZ and 908.4MHZ

I live in UAE and I bought my smartthings from US (amazon.com)

according to this site: http://store.zwavecenter.com/index.php?route=information/information&information_id=4

US = 908.4
UAE: 868.4

and according to smartthing help page: https://support.smartthings.com/hc/en-us/articles/205956900-Meet-the-Samsung-SmartThings-Hub-hardware

it say “he Hub contains a ZigBee radio (2.4 GHz) and a Z-Wave radio (900 MHz). These allow the Hub to communicate with your ZigBee and Z-Wave devices.”

so now which one I choose?


#2

Wow, that official support page is incorrect. :scream:

If you have the US version of the hub, it operates on zwave frequency 908.4 MHz

If you have the UK version of the hub, it operates on zwave frequency 868.4 MHz

All the zwave devices you use must exactly match the frequency of your hub. This cannot be changed after the time of manufacture.

https://products.z-wavealliance.org

You Need to check the model number of your hub. It’s probably on the US frequency, but you need to make sure.

http://thingsthataresmart.wiki/index.php?title=Hubs

@Brad_ST

All of that said, the Z wave frequency assigned to Saudi Arabia is 868.4, the same as Europe/UK.

https://www.silabs.com/products/wireless/mesh-networking/z-wave/benefits/technology/global-regions?cid=nat-acq-zwv-041818

Different regions have different frequencies because the local frequency used for mobile phones and emergency services communications like ambulances vary.

In some countries, it is illegal to use devices on the Z wave frequency of another region because they can cause interference with local emergency services.

So you should definitely check to make sure that it is legal for you to be operating without a license on the US frequency before purchasing any more equipment.


(Sultan Alkaabi) #3

thank you for your feedback.

it’s really make things clear to me.


(Brad) #4

JD - Thanks for pointing out the inaccurate information in the KB article.

The Z-Wave chip in the North American SmartThings Hub uses two channels, 908 and 916.