# Why No 433 MHZ Transmit in US? **URL:** \ **Category:** Questions & Help\ **Created:** [January 14, 2023, 10:35pm UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101 "2023-01-14T22:35:31Z")\ **Posts on this page:** 19\ **Page:** 1
**Author:** ![jdorman](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jdorman/32/33978_2.png) [@jdorman](https://community.homey.app/u/jdorman)\ **Post date:** [January 14, 2023, 10:35pm UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/1 "2023-01-14T22:35:31Z")
Why does Homey say that in the “USA and Canada, transmitting on the 433 MHz band is not allowed and therefore disabled automatically.” ? ---
**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\ **Post date:** [January 14, 2023, 10:38pm UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/2 "2023-01-14T22:38:24Z")
[https://support.homey.app/](https://support.homey.app/) \> Scroll down to ‘Customer Support’ \> follow links ---
**Author:** ![jdorman](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jdorman/32/33978_2.png) [@jdorman](https://community.homey.app/u/jdorman)\ **Post date:** [January 14, 2023, 10:45pm UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/3 "2023-01-14T22:45:46Z")
Don’t think this is a support issue as this is stated on the FAQ section for the Homey Bridge. ---
**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\ **Post date:** [January 14, 2023, 10:56pm UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/4 "2023-01-14T22:56:34Z")
Sure, but you want an answer from Athom, as I understood from your question. The best and quickest way to get that answer, is informing @ support. This is mainly a users forum, and we don’t know backgrounds about Athom’s decisions 😉 👍 ---
**Author:** ![Dijker](https://avatars.discourse-cdn.com/v4/letter/d/b9bd4f/32.png) [@Dijker](https://community.homey.app/u/Dijker)\ **Post date:** [January 15, 2023, 8:03am UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/5 "2023-01-15T08:03:25Z")
Guess it has to do with this > **[LPD433](https://en.m.wikipedia.org/wiki/LPD433)** > > LPD433 (low power device 433 MHz) is a UHF band in which license free communication devices are allowed to operate in some regions. The frequencies correspond with the ITU region 1 ISM band of 433.050 MHz to 434.790 MHz, and operation is limited to CEPT countries. The frequencies used are within the 70-centimeter band, which is currently reserved for government and amateur radio operations in the United States and most nations worldwide. > LPD hand-held radios are authorized for licence-free voice... ![Screenshot_20230115_090053_Chrome](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/9/7/97dc19d45ec5c4cf9bfe19546a049937fcbf3650.jpeg) ---
**Author:** ![jdorman](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jdorman/32/33978_2.png) [@jdorman](https://community.homey.app/u/jdorman)\ **Post date:** [January 15, 2023, 3:53pm UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/6 "2023-01-15T15:53:06Z")
This article covers the use of 433 MHz in IoT use cases. [https://www.edn.com/using-433-mhz-for-wireless-connectivity-in-the-internet-of-things/](https://www.edn.com/using-433-mhz-for-wireless-connectivity-in-the-internet-of-things/) I believe a license is required only if you wish to use this spectrum for long, high powered transactions, like amateur radio. ---
**Author:** ![robertklep](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/robertklep/32/160628_2.png) [@robertklep](https://community.homey.app/u/robertklep)\ **Post date:** [January 15, 2023, 4:02pm UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/7 "2023-01-15T16:02:28Z")
The restrictions mentioned there are very likely too limiting for Homey, with the additional complication that Homey’s transmissions fall (partly) beyond Athom’s control if you consider that transmissions are instigated by (third-party) apps. ---
**Author:** ![Dijker](https://avatars.discourse-cdn.com/v4/letter/d/b9bd4f/32.png) [@Dijker](https://community.homey.app/u/Dijker)\ **Post date:** [January 15, 2023, 9:17pm UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/8 "2023-01-15T21:17:13Z")
> [@jdorman](#): > > I believe a license is required only if Thanks for your article about IoTuse cases, If I read: ![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/7/5/75eb3959efb1298230848ea552920283f5a6358b.png) and further , Homey has to “Deny” flows that transmit to switch / dim Light bulb after sending a signal to Light bulb # 1. So When you send to a second or third light it will probably fail. (And building these extra restrictions for one country where it doesn’t contribute to a stable functioning, Guess the Somfy Remote is legal in USA but not meant to be used in automation according to these regulations.) ![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/d/2/d276d1533f700055d140545df1784843d5f763b0.png) Maybe Z-wave and Zigbee are better for home automation and not bound to that FCC regulations. ---
**Author:** ![jdorman](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jdorman/32/33978_2.png) [@jdorman](https://community.homey.app/u/jdorman)\ **Post date:** [January 16, 2023, 2:35am UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/9 "2023-01-16T02:35:06Z")
I have 2 Somfy shades that use RF. The 10 second limitation wouldn’t be a limitation in that use case. There is also nothing stopping me from pressing a button on the Somfy RF remote twice within 10 seconds, so I wonder if a different rule that governs remotes vs devices that regularly send updates. ---
**Author:** ![Dijker](https://avatars.discourse-cdn.com/v4/letter/d/b9bd4f/32.png) [@Dijker](https://community.homey.app/u/Dijker)\ **Post date:** [January 16, 2023, 8:06am UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/10 "2023-01-16T08:06:00Z")
It is just the way as your article describes that makes implementing difficult imho. Do you have examples of other home automation controllers with FCC certification on the market that do allow programmable 433Mhz communications? (In the US) ---
**Author:** ![jdorman](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jdorman/32/33978_2.png) [@jdorman](https://community.homey.app/u/jdorman)\ **Post date:** [January 17, 2023, 3:30am UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/11 "2023-01-17T03:30:34Z")
I believe the Bond Pro might match that description. IR, RF and Wi-fi with an ESP32 processor. ---
**Author:** ![UseMeDontAbuseMe](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/usemedontabuseme/32/89412_2.png) [@UseMeDontAbuseMe](https://community.homey.app/u/UseMeDontAbuseMe)\ **Post date:** [April 12, 2024, 5:54am UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/12 "2024-04-12T05:54:48Z")
America uses 433 mhz in government commutations but we are supposed to be able to use 433 mhz if it is under one watt of power (short range). I want to use kinetic switches (battery free) with homey pro, this is not fair it is turned off!!! Enocean uses 902 mhz in America, to bad homey does not have more frequencies available to use!!! [https://www.enocean.com/en/product-category/kinetic-switches/](https://www.enocean.com/en/product-category/kinetic-switches/) ---
**Author:** ![Henrik\_Johnsson](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/henrik_johnsson/32/13707_2.png) [@Henrik\_Johnsson](https://community.homey.app/u/Henrik_Johnsson)\ **Post date:** [April 12, 2024, 8:35am UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/13 "2024-04-12T08:35:19Z")
> [@UseMeDontAbuseMe](#): > > this is not fair it is turned off!!! Lodge a complaint with FCC? ---
**Author:** ![JPe4619](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jpe4619/32/9017_2.png) [@JPe4619](https://community.homey.app/u/JPe4619)\ **Post date:** [April 13, 2024, 4:23pm UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/14 "2024-04-13T16:23:06Z")
maybe you can work around with: > **[OpenMQTTGateway v1.7.0](https://docs.openmqttgateway.com/)** > > One gateway, many technologies: MQTT gateway for ESP8266, ESP32, Sonoff RF Bridge or Arduino with bidirectional 433mhz/315mhz/868mhz, Infrared communications, BLE, beacons detection, mi flora / mi jia / LYWSD02/ Mi Scale compatibility, SMS & LORA. ---
**Author:** ![jdorman](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jdorman/32/33978_2.png) [@jdorman](https://community.homey.app/u/jdorman)\ **Post date:** [May 2, 2024, 12:29pm UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/15 "2024-05-02T12:29:03Z")
> [@jdorman](#): > > There is also nothing stopping me from pressing a button on the Somfy RF remote twice within 10 seconds, so I wonder if a different rule that governs remotes vs devices that regularly send updates. How about a satellite Homey Bridge in RF only mode! ---
**Author:** ![UseMeDontAbuseMe](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/usemedontabuseme/32/89412_2.png) [@UseMeDontAbuseMe](https://community.homey.app/u/UseMeDontAbuseMe)\ **Post date:** [June 4, 2024, 9:43am UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/16 "2024-06-04T09:43:42Z")
It’s pretty funny, that we can buy 433 mhz devices though, no matter if we are in America… This is B’s and should be turned on!!! ---
**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\ **Post date:** [June 4, 2024, 11:00am UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/17 "2024-06-04T11:00:03Z")
> [@jdorman](#): > > How about a This is just a users forum, don’t count on Athom (the manufacturer) to read your post. So, it’s best to write to [https://homey.app/support](https://homey.app/support) instead. ---
**Author:** ![Sharkys](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/sharkys/32/54029_2.png) [@Sharkys](https://community.homey.app/u/Sharkys)\ **Post date:** [June 4, 2024, 11:38am UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/18 "2024-06-04T11:38:18Z")
What about Broadlink devices ? Are those available in US, like Broadlink RM4 Pro or older BroadLink RM PRO ? ---
**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\ **Post date:** [June 4, 2024, 4:09pm UTC](https://community.homey.app/t/why-no-433-mhz-transmit-in-us/75101/19 "2024-06-04T16:09:57Z")
Looks like it! I entered 37854 as random US delivery ZIP code RF 433MHz doesn’t seem to be any issue? And it has 315MHz as well. ![Screenshot_20240604-180355_Chrome](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/f/f/ff06684d1dd2486f9e728f95b7e4c1a81e843b8e.jpeg) ![Screenshot_20240604-180611_Chrome](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/8/4/84d11c07f698b1d9ce6f2a7fef8d8dcd1e9182fa.jpeg)