5 GHz versus 2.4 GHz

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1.
5GHz quits when I walk to far end of house.
The 2.4GHz still gives a good signal from same router.
I expected it would have been good for at least the same distance
as 2.4GHz.
The router is Tplink AC 1750 Model No. Archer C7

Is this normal for 5GHz signal to NOT reach as far as 2.4GHz?


2.
Yes it is normal.  Typically with higher the radio frequency at the same  
power level as a lower frequency signal environmental things like walls  
and furniture cause a weaker signal on the higher frequency for the same  
range.

http://www.linksys.com/us/support-article?articleNum=134478

3.
Does 802.11n automatically switch between 2.4 & 5GHz as needed?

My phone let's me manually connect to either SSID. The Roku & tablet
won't even see the 5GHz SSID. When the phone is connected to 5GHz
a program called Fing can see the Roku & tablet even when they're
connected to the 2.4GHz SSID.
The tablet & Roku are supposed to be 802.11n.

Is there a program to tell me if I'm actually connected to G, N, B or
whatever?

4.
Most routers do allow you to lock it at a specific frequency.  In your  
case it sounds like you might do better to go into the router and try  
locking it at 2.4 or the G standard.  That should make your existing  
equipment operate a little smoother together.

Unfortunately none of my PC's or phones work in the 5Ghz band so I can't  
provide more definite info.

Hopefully others here can give you more informed information on this.

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