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Old 01-10-2012, 01:31 AM
mogulman mogulman is offline
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Default Dual Band router - Interference with 5.8Ghz Cordless Phone

I was testing out a Netgear WNDR4000 Dual Band Wireless router today and noticed that one of our cordless phones, a Uniden 2-line 5.8Ghz Cordless, sounded really bad.

I was using a 2.4Ghz Router before now, and never noticed this. So I decided to try disabling the 5Ghz Wireless on the Netgear WNDR4000. The Cordless phone then functioned perfectly.

Is this normal? I thought 5ghz was far enough away from 5.8 to not interfere?

I had the 5Ghz Wireless in the Netgear WNDR4000 on channel 161. Is it possible another channel would be better?
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Old 01-10-2012, 01:51 AM
mogulman mogulman is offline
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Ok.. I tried 149 and it seems better. Hopefully, the frequency hopping that the cordless does won't be a problem but its good for now. I guess I just thought they were different frequencies since they always say 802.11 is 2.4 or 5ghz. I guess its more like 5.x Ghz.
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Old 01-10-2012, 03:48 PM
stevech stevech is offline
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I'd suggest you replace the cordless phones with a "DECT" phone. DECT is an international standard, like WiFi. These are in a 1.7GHz band allocated (in the US) to cordless phones alone. The DECT phones work far better than the 5.8GHz phones.

yes, marketing types seem to say 5GHz - but the unlicensed ISM band used by WiFi and MANY other services is in the range of 5.8GHz. There's another less used unlicensed band around 5.4GHz.

Left to their own, I guess they'd say 2GHz, not 2.4GHz.

Last edited by stevech; 01-10-2012 at 03:51 PM.
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Old 01-10-2012, 05:13 PM
mogulman mogulman is offline
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yeah.. I ended up looking it up...

So the higher end channels for 802.11n in the US, 149-165, correspond with 5.745Ghz-5.825Ghz.

5.8Ghz cordless phones use 5.725-5.850Ghz. So yeah.. there is overlap there. So far 149 seems to be OK with my wifi.

I may end up changing to a DECT 6.0 phone. BTW.. DECT 6.0 is 1.920-1.930Ghz here in the US. or find some older 900Mhz phone
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Old 01-10-2012, 05:15 PM
mogulman mogulman is offline
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Off to CES.. Maybe I'll find something interesting there.
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Old 01-10-2012, 05:56 PM
njweb njweb is offline
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I switched to DECT 6.0 (1.9 GHz) phone technology several years ago for several reasons:

1. I wanted the latest in terms of clarity and range.
2. I wanted to avoid interference with WiFi devices (1.9 GHz has no overlap with Wifi's 2.4 GHz and, more obviously, 5 GHz bands), unlike 5.8 GHZ and 2.4 GHz phones.
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Old 01-10-2012, 11:58 PM
stevech stevech is offline
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My error: I said DECT was 1.7GHz - and it's indeed near 1.9GHz.
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Old 01-11-2012, 12:05 AM
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Yeah DEC phones work nice been using that since my 5.8GHz VECT had died. Extended Range ones from Panasonic works out great with WiFi Routers.
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Old 01-15-2012, 07:25 PM
sfx2000 sfx2000 is offline
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Count me in with the DECT crowd - not just less interference with the WiFi in 2.4 and 5 gigahertz bands, but also better codecs used between the handset and the base station. Better codecs, better voice quality...

And DECT is fairly smart about adjacent devices... for extension mobiles as well as the neighbors - it's all built into the chipset and protocols - good stuff...

DECT was a candidate for 2G wide area cellular networks before CDMA and GSM dominated from a business perspective

http://en.wikipedia.org/wiki/Digital...communications

It's very similar in usage, if not implementation, to Personal Handyphone (PHS) which was big in Asia... I've seen PHS also used in home area cordless...

http://en.wikipedia.org/wiki/Persona...y-phone_System

sfx
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Old 01-15-2012, 10:48 PM
mogulman mogulman is offline
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I already have another Uniden 2 line DECT phone. Will two DECT phones play well together?
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