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Dect 6 Cordless phone and WIFI interference - SOLVED

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Dect 6 Cordless phone and WIFI interference - SOLVED

Postby Andyp » 04 Jan 2018, 18:02

We finally bit the bullet and replaced our old cordless phone. The amount of WIFI use with potentially 4 devices using WIFI while we are using the landline and the subsequent interference meant that it had to go.
I bought a Panasonic Dect 6 cordless which runs on 1.9ghz bandwidth which according to what I have read is far away from the 2.4Ghz that the WIFI router uses.
But the interference when a WIFI device is being used is still there.

I cannot move the phone any further away from the router as the phone cable plugs in the back of it.

I have tested all other WIFI channels but the interference is still there.

Is the widely reported stuff on the internet about Dect 6 cordless phones not suffering from WIFI interference pure fiction?

Is there anything else I can do?
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Re: Dect 6 Cordless phone and WIFI interference

Postby DaveL » 04 Jan 2018, 19:03

Andy,
Are you sure the phone is the source of the interference, does the WiFi improve when you turn the phones off?

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Re: Dect 6 Cordless phone and WIFI interference

Postby Andyp » 04 Jan 2018, 19:32

Dave, the problem is the other way around. The devices using wifi (mobiles, iPad and iPod) are interfering with the phone making conversation impossible. While anything is being streamed or pages loaded etc onto a device the crackling on the phone is incessant.
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Re: Dect 6 Cordless phone and WIFI interference

Postby DaveL » 04 Jan 2018, 19:38

Oh sorry I misunderstood , so if you use a wired phone the interference is not there?
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Re: Dect 6 Cordless phone and WIFI interference

Postby Andyp » 04 Jan 2018, 19:53

That’s right Dave and has been tested. But a corded phone in our main living room where all the connections are is a not really an option.
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Re: Dect 6 Cordless phone and WIFI interference

Postby old » 04 Jan 2018, 20:26

If you reset the router it usually changes the channels it uses, you can see this on a phone app 'say' wifi analyzer this may help but you could have to restart your wifi devices .This has worked for me with interference from arlo.
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Re: Dect 6 Cordless phone and WIFI interference

Postby Andyp » 04 Jan 2018, 21:55

Chris, I have already manually tried all available channels without any change in the interference. I have tried a reset while watching on an analyzer app and the channel did not change.
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Re: Dect 6 Cordless phone and WIFI interference

Postby RogerS » 04 Jan 2018, 22:05

Andy, did you come across this thread in your searches ?

https://www.edn.com/electronics-blogs/b ... ory-effect
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Re: Dect 6 Cordless phone and WIFI interference

Postby Andyp » 05 Jan 2018, 08:28

I had not seen that one Roger, thanks. I wonder if I place some aluminum foil alongside the phone, between it and the router, if it will help. Will give it a try anyway.
Alternatively I could get an extension cable for the phone but running it to the other end of the room will be a right PITA.
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Re: Dect 6 Cordless phone and WIFI interference

Postby RogerS » 05 Jan 2018, 09:36

Andyp wrote:I had not seen that one Roger, thanks. I wonder if I place some aluminum foil alongside the phone, between it and the router, if it will help. Will give it a try anyway.
Alternatively I could get an extension cable for the phone but running it to the other end of the room will be a right PITA.


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Re: Dect 6 Cordless phone and WIFI interference

Postby Woodbloke » 05 Jan 2018, 12:15

We've got one of they bad boys as well and have never had any issues with interference. Sits right next to the iMac (connected to the router by ethernet cable, no wifi connection) and is about 4m away from the router box. Works perfick - Rob
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Re: Dect 6 Cordless phone and WIFI interference

Postby Andyp » 05 Jan 2018, 12:22

Thanks Rob, mine is 1.2m away. Experiments with distance and tin foil are underway.
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Re: Dect 6 Cordless phone and WIFI interference

Postby Andyp » 05 Jan 2018, 18:02

Shielding the phone with tin foil did not work.

Placing the phone at the other end of the room 8 metres from the router and with a cast iron fireplace surrounded by a brick chimney breast between phone and router and testing all the 13 available channels did not work.

Call to ISP pending, will request new router - probably should have done that first.
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Re: Dect 6 Cordless phone and WIFI interference

Postby RogerS » 05 Jan 2018, 18:05

I can feel your frustration. Dunno if it helps (probably not) but I've noticed that our marginal mobile signal from Three is kyboshed when I turn my router on.

Off-field thought....can you alter the wifi aerial orientation ?

Could it be mains borne interference ? Have you got any ferrite beads ?

Do you have any ethernet cables plugged in to the router ? Could you remove them temporarily ?
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Re: Dect 6 Cordless phone and WIFI interference

Postby Coley » 05 Jan 2018, 18:06

I'll embarrass myself here,but what were those filter type boxes that use to come with routers for ? Were they meant to do something similar to what you're asking ?

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Re: Dect 6 Cordless phone and WIFI interference

Postby Andyp » 05 Jan 2018, 18:27

Thanks for your suggestions Roger.

RogerS wrote:I can feel your frustration. Dunno if it helps (probably not) but I've noticed that our marginal mobile signal from Three is kyboshed when I turn my router on.

Off-field thought....can you alter the wifi aerial orientation ? No aerial attached to the box, aerial must be built in

Could it be mains borne interference ? dunno Have you got any ferrite beads ? unfortunately not

Do you have any ethernet cables plugged in to the router ? yes the mac is on ethernet Could you remove them temporarily ? I will try that later but I do not understand what difference that will make.
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Re: Dect 6 Cordless phone and WIFI interference

Postby Andyp » 05 Jan 2018, 18:30

Coley wrote:I'll embarrass myself here,but what were those filter type boxes that use to come with routers for ? Were they meant to do something similar to what you're asking ?

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Interesting thought. I do have some of the filter boxes but they are hard wired onto short UK leads.The french plug is different and I do not have any converters but will see if they are available.
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Re: Dect 6 Cordless phone and WIFI interference

Postby RogerS » 05 Jan 2018, 18:39

Andyp wrote:....
Do you have any ethernet cables plugged in to the router ? yes the mac is on ethernet Could you remove them temporarily ? I will try that later but I do not understand what difference that will make.
[/quote]


Duff design....wifi being radiated down the ethernet cable maybe ?

Turn the wifi router on its edge or round a different way to simulate changing the aerial direction.
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Re: Dect 6 Cordless phone and WIFI interference

Postby Andyp » 05 Jan 2018, 19:34

Roger, go down the pub and buy yourself a pint and send me the bill. :obscene-drinkingcheers:

Initial tests show that removing the ethernet cable works. No more interference on the phone when wifi is being used. There are four ethernet ports on the router and the interference was there on all of them.

This does mean that the iMac is back on Wifi which might be a bit slower and maybe it will suffer interference from the Microwave. I will run through the channels again to see if I can sort that out but I am sure I tried that years ago without success.

I so wish I could come up with a suggestion to solve your woes.
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Re: Dect 6 Cordless phone and WIFI interference - SOLVED

Postby RogerS » 05 Jan 2018, 22:23

That's brought a HUGE smile to my face that I could help.

Ta muchly.

You need something like this

https://www.ebay.co.uk/itm/6Pcs-5mm-Cli ... 2256441708

but Bob's your man.
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Re: Dect 6 Cordless phone and WIFI interference - SOLVED

Postby TrimTheKing » 06 Jan 2018, 00:10

This makes absolutely NO SENSE AT ALL!!!!!

I hate when things like this work (obviously happy for you Andy) as I now NEED to understand why!!!

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Re: Dect 6 Cordless phone and WIFI interference - SOLVED

Postby Andyp » 06 Jan 2018, 08:24

Me too Mark. There is some stuff on the web about interference from ethernet cables but I am not sure that I understand how a router pushing out 2.4ghz radio waves can transmit over the ethernet cable to interfere with a cordless phone that recieves 1.9ghz.

I have bought a pack of those snap on ferrite thingies and will try to surpress the ethernet cable in due course.
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Re: Dect 6 Cordless phone and WIFI interference - SOLVED

Postby RogerS » 06 Jan 2018, 09:04

Andyp wrote:Me too Mark. There is some stuff on the web about interference from ethernet cables but I am not sure that I understand how a router pushing out 2.4ghz radio waves can transmit over the ethernet cable to interfere with a cordless phone that recieves 1.9ghz.

I have bought a pack of those snap on ferrite thingies and will try to surpress the ethernet cable in due course.


You're making the assumption that the router is ONLY transmitting at 2.4GHz. These things are made down to a price.
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Re: Dect 6 Cordless phone and WIFI interference - SOLVED

Postby Andyp » 06 Jan 2018, 09:28

I have a wifi analyser app on my phone which confirms that the WIFI signal is 2.4ghz.

I will still try and sort this out with the ISP and see if we can get a new router anyway. I now know that there 5.0ghz routers available. Perhaps that will work better?
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Re: Dect 6 Cordless phone and WIFI interference - SOLVED

Postby RogerS » 06 Jan 2018, 10:34

Andyp wrote:I have a wifi analyser app on my phone which confirms that the WIFI signal is 2.4ghz.

I will still try and sort this out with the ISP and see if we can get a new router anyway. I now know that there 5.0ghz routers available. Perhaps that will work better?



Noo..oo! You're making the assumption that the analyser is looking across the RF spectrum. It most likely won't be. So it won't recognise any out of band (ie non 2.4 GHz frequencies). Properly designed RF kit will have all sorts of filters etc to limit out-of-band frequencies.....These products are designed down to the lowest cost. Ergo no filters. If you were do get hold of a wide-spectrum signal analyser then you'll see all sorts of crud coming out.

Take a look at leaky feeders....they are coax cables designed to radiate RF as opposed to most coax cables that are designed to screen out RF!

I don't see any valid reason why a 5 GHz wifi would be designed any better.

TBH I have always avoided getting involved with any frequency above 5.5MHz which was the highest video frequency I got involved with at the Beeb.

RF is a black art.
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