Switching to 2.4 GHZ on a dual band

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BluStu59 wrote:

Does anyone know if I can set the R6220 dual band router to 2.4 GHZ only? 

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Yes, you can. NETGEAR AC1200 Smart WiFi Router with External Antennas Model R6220 User Manual, p.125 ... just untick the 5 GHz Enable Wireless Radio, and [Apply].

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BluStu59 wrote:

I have a Google Mesh System at the moment and I need a separate network using 2.4 GHZ only and google will not allow that. 

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No, you don't have to.... This is not a whatever Mesh vendor problem - wee see these kind of requests here on all decent WiFi routers and Mesh systems here for years, too. That's why even helpful people here (me included) tend to become nasty on these subjects if they read the nonsense all the junk makers write in their docs and support pages. Because it's simply wrong. Because the push customers like you to ask for a feature that is for good reasons not available on modern WiFi installations.

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BluStu59 wrote:

I'm trying to set up a Ambient Weather STation  and it will only work on a 2.4 GHZ network.  

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No, it is implemented with a 2.4 GHz wireless interface which can perfectly work with any combined 2.4/5GHz router/wireless access point/mesh system - once it's configured with the network name and the passphrase to access the wireless it will connect to the 2.4 GHz radio - in fact it does not know there is a wireless with the same name on 5 GHz on air, too.

The problem are braindead utilities for discovering these toys - the makers of these (and even more the makers of the IoT embedded devices chips with everything including WiFi for e few cents) are the effective problem. There you can SHOUT, AND YOU MUST SHOUT!!! Their discovery and installation applications are junk, they check that your iOS or Android device is connected to 2.4 GHz ... however most modern clients tend to use the 5 GHz band at least in the typical range of modern wireless devices.

First complain to the maker of your IoT(oy) maker about their garbage discovery and installation App. Feel free to add a link to my post!!!

Second, configure this Netgear router 2.4 GHz radio to the same SSID (network name) and password/passphrase  as used on the Google WiFi. Shutdown the Google WiFi (power off), and connect the Netgear router to the Internet connection where the Google router is usually connected. Now discover the weather station, and configure it.

Third, shutdown the Netgear router, and bring the Google WiFi up again. Cold reboot the weather station. Well possible, the weather station will connect to the Google WiFi.

Fourth, In case it does not, reconfigure the Netgear router to become a Wireless Access Point (Use the Router as a Wireless Access Point RT*M p.127, Use the Router as a Wireless Access Point  ...) and set a dedicated wireless name and security password, connect your mobile to that new wireless, and re-do the discovery and installation of the IoT again.