View Full Version : WiFi interference withcordless phone

16-11-2012, 09:30 AM
I have been having a lot of interference between my telecom technicolor TG582N wifi router and my Uniden DECT cordless phones. Having researched this problem on Google it is obvious it is a well known problem. I haven't found a satisfactory solution so wonder if anyone here has got it sorted out.

bk T
16-11-2012, 09:34 AM
Have you tried to change the router channels?

16-11-2012, 09:36 AM
yes I did try that but must have done something wrong as the router would not connect to the internet

Speedy Gonzales
16-11-2012, 09:38 AM
Doesnt sound like a wireless prob if the router cant even connect to the internet. It sounds like a username / password prob. If it needs it. So it can connect

bk T
16-11-2012, 09:42 AM
If you're not sure what you've done, simplest way is to reset it to factory defaults by pressing the pinhole with a paper clip (or something like that) for about 10 seconds. It will reboot and you can go all over again.

You don't need to enter the password and username.

16-11-2012, 10:03 AM
But DECT phones are 1.8GHz, therefore are a long way from wifi 2.4GHz. Bit puzzling how they could clash. Something funny is going on.

Speedy Gonzales
16-11-2012, 10:10 AM
Is it a DECT or WDECT cordless phone. which are 2.4. The Uniden cordless I had was 2.4 ghz. And it says Wdect on it

The Error Guy
16-11-2012, 10:13 AM
Simple test, turn the router off. Interference stops? It's a router problem (Perhaps there is some sort of interference from the antennae causing some random harmonic on the 1.8GHz band?) if not then it's an outside source.

We have a DECT handset, one day I picket it up to make a call when halfway through it was overcome by static and a very loud squealing noise. It was fixed by restarting the phone and base station. Happened several times that day but only in certain areas. If you stayed in one spot for example I didn't happen. I never knew what caused it.

16-11-2012, 10:23 AM
But DECT phones are 1.8GHz, therefore are a long way from wifi 2.4GHz. Bit puzzling how they could clash. Something funny is going on.

Sorry I think the phones are WDECT and they are on the 2.4ghz frequency

16-11-2012, 10:24 AM
I just put the settings back to the original and I can use the internet now but it stil interferes

bk T
16-11-2012, 10:33 AM
The router interferes with your phone or the phone interferes your Internet?

Which channel are your using?

16-11-2012, 11:04 AM
Ah, WDECT - another animal. You may have to bite the bullet, then, and replace your phone. Life's too short to fight interference!

Speedy Gonzales
16-11-2012, 11:11 AM
Which is exactly what I did. I dont know if my old phones were causing the prob. But beside the old phones (then) is a wireless printer. And when it was on, after so long (2-3 mins) while you were talking it started to echo.

Probably didn't help, when the 2 pcs here also use wireless (USB adapters), and the Xbox is also wireless (the Xbox and the computers are in a bedroom). The printer and modem are in the lounge.

But since I've replaced the phones with a pair of Panasonic 1.8 ghz handsets, t hasn't happen

16-11-2012, 11:22 AM
I have a new Xdect Uniden phone which they say is Wi Fi friendly.

16-11-2012, 04:02 PM
How close are the router and the base station for the phone? seperating them as much as possible can be helpful. I've never even checked frequencies and I have two cordless phones and wi-fi and various wirless devices and it all just works :) I know one phone is dect and sitting about 1.5M from the router and the other is an old panansonic that pre-dates dect and is on the other side of the house.

16-11-2012, 04:52 PM
I have a Dynalink RTA1025W router & Uniden XS1215 2.4GB phone.
If the modem is in the same room as the phone base, the wireless disconects if the phone is used.

16-11-2012, 05:08 PM
Buy a 'WiFi friendly' phone. Uniden's WiFi friendly ones generally run on 1.8GHz, which keeps you away from the 2.4GHz and 5.8GHz consumer wifi gear runs on, and in theory should give you slightly better penetration through walls etc, although YMMV.

I recently bought one of these.


16-11-2012, 05:23 PM
My cordless phone is very WiFi friendly as it operates around 90Mhz or something.

My other phones are corded and have even less of an impact.

Billy T
16-11-2012, 08:30 PM
There is a harmonic relationship there. The 3rd harmonic of 2.4GHz is 7.2GHz and the 4th harmonic of 1.8GHz is 7.2GHz.

The phone is probably more powerful than the wifi, and digital signals are rich in sideband harmonics, so I'd try changing the channel used on the phone or the wifi if either gives that option.

At what distance between the two items does the interference stop?


Billy 8-{)

17-11-2012, 09:22 AM
You sound very knowledgeable. I don't think there is an option for changing channels on either the phone or the router.
The phone base is about 15 meters away from the router although I have a wifi repeater about 5 meters from the phone base.
One of the problems is that I have 4 phones spread around the house so I don't really want to have to buy 4 more! I used to have a hard wired router and had no problems but since I bought an IPad I need the wifi.
Am currently just pulling out the power lead from the wifi except when I want to use the internet - damn nuisance!
Thanks for your input

17-11-2012, 01:50 PM
Ditch the iPad and problem solved :devil

18-11-2012, 04:43 PM
Channel 11 is farthest away and might be an improvement.

18-11-2012, 07:08 PM
Is that on the phone or modem?