Slow speeds on 2.4ghz vs high speeds on 5ghz

[socalwrx]

I've recently been on a testing spree to get my wireless network to fill the entire house with at least 20mbps in every room. In doing so I've moved my wireless router to a central location via powerline adapters which has increased the signal significantly!

However, only my 5ghz devices are getting fast steady speeds. My 2.4ghz devices are stumbling to 2-5mbps. Here's what I'm working with:
-Time Warner 50mbps (this is consistent and checked often)
-Cisco N900 (Dual band simultaneous N router) - I have the connections seperated
-TP link 300mbps powerline adapters
-3 2.4ghz devices / 2 5ghz devices

Using my android im standing next to the router and getting 20mbps SOLID on 5ghz and stumbling 2-5mpbs on 2.4ghz. Same with my VAIO Pro (5ghz vs 2.4ghz tested), and same weak connection on my 2.4ghz only PC (All N devices) with almost excellent connection
*Also small neighborhood so only a few 2.4ghz devices popping up (no congestion)

If router is connected to the modem directly all speeds are blazing fast, Not sure why using powerline adapters is hindering 2.4 performance only?

..Might just pick up that Asus 😛

 

[TheSocialIrony]

Zero: Turn it on and off again. Turn all the things on and off again. You'd be surprised how effective this can be.

First, double check to make sure there is no clutter, halogen lamps, washers, dryers, etc. in your path AND simply near your router.

Second, make sure your 2.4 GHz channel is not bleeding into or being bled into from your neighbors (you may both be on channel 6, the default)
2.1 You can get plenty of free wifi scanning tools that will also pick up SSIDs that aren't being broadcasted, as well as what channels other routers on and how wide they broadcasting their frequencies at (20,40,80 mhz will bleed when you only have 5mhz separation between channels).
All of the devices in your house can cause interference, but here's what more likely: 2.4 GHz has a smaller bandwidth available to you, and you have more devices connected to it, where 5 GHz is a stronger signal and has more bandwidth available with fewer devices on it.

If this doesn't help you may need to take more drastic measures, such as the windsurfer mod

 

[Artin Phares]

Zero: Turn it on and off again. Turn all the things on and off again. You'd be surprised how effective this can be.

I was surprised.
I had and issue with wifi connection - download speed became really slow for no reason (~200KB/s). When googling I came to this thread.
- "Zero: Turn it on and off again"
- "Pffff" - I said - "Cmon, do not ask me to reboot three times. But ok, why not. Let's switch things..."
I go to the wifi router admin. I switch bandwidth from 5GHz to 2.4GHz (dual band router ASUS N66U), and right after that back from 2.4GHz to 5GHz.
Download speed is ~9MB/s now. WTF happening here!
Thanks =)