Really Really dissappointed in Zigbee implemenation -

Use channel 25 or 20, 26 is not an ideal zigbee channel.

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20 was the magic channel for me.

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changed to 25

Ohhh !!! I didn't know about this one... nice tip !!!

My hub is using channel 11. If I switch channels will my zigbee devices stop responding ?

Yes, but they should pick up the new channel i. 24 hours. 11 is a fine channel for zigbee, if it ain't broke don't fix it. Just 26 is not an ideal channel to use, IMO.

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I read channel 26 is actually lower in power, due to some FCC regulation nonsense.

I'm on 25 and have 4 Xbees, my mesh is very solid, 16 Iris motion sensors, 5ST motion sensors, and 6 ST flood sensors and rarely does stuff fall off.

That's true; quoting from a Silicon Labs application note on passing FCC certification (I think in practice this would depend on the power amp design):

Band Edge concerns: The top end of the 802.15.4 channel band (Channel 26 and occasionally Channels 24 an 25 at very high output powers) usually pushes up against the limits of the band, encroaching into the reserved area in the adjacent (higher) frequencies. Therefore, it's often necessary to artificially limit (with software) output power on these upper channels (as much as -9 or -10 dBm) in order to pass FCC TX testing.

Was curious to see things being routed via a harmony hub I have, I find the harmony a bit flaky so actually have it set to power cycle daily which I gues could be problematic

Am I interpreting this correctly ?

The LQI numbers are low for a couple of your routing devices. I don't know much about the numbers but you might want to force a Zigbee repair after you change the Zigbee channel away from 26 (shut down the hub for 30 minutes and then turn back on). Run that same report again. If the numbers on the Environmental sensor and washing machine are still below upper 200s you should look at the placement of those devices and or adding new repeaters.

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I had the same issue with the GE Link bulbs with ST when the new app came out. Only way I was able to keep using them was to run both versions of the app , or just not use the new one. Actually I had the same issue with my GE/ Jasco switch too.

Don't have any iris components.

I have 5 sengled classic bulbs, none that close to the hub , most upstairs (hub is in the laundry room on the ground floor in the middle of the house) and haven't had any issues with them.

What I have had an issue with is my Cree and GE Link bulbs randomly flashing on and back off quickly, sometimes at a really inconvenient times like 3:00 am. No one has been able to really explain why except to say it a firmware issue with them. So i'm just replacing them with Sengled's or a new z wave bulb I have heard rumor of coming out in the not too distant future. I'm not getting too aggressive about it since i'm waiting on that release.

The harmony hub doesn't have a zigbee radio (unless you have the Harmony Hub Extender box). Seems more likely that you have a zigbee outlet called "Harmony Hub Power".

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@Rxich ... just curious, how are you enclosing your Xbees? (and I guess related, which antenna style?)

Hate to sound stupid, but what is Xbee?

I was going to start out with "Don't be stupid" but I didn't.