FritzBox 7490 - Any way to change the channel width for the 5Ghz band? I want to make it set to only 20/40mhz

Forums › 2degrees › FritzBox 7490 - Any way to change the channel width for the 5Ghz band? I want to make it set to only 20/40mhz

Stacy88

10 posts

Wannabe Geek

# 252788 11-Jul-2019 21:24

Hello everyone,

I have the FritzBox 7490 and was wondering if it is possible to change the channel width for the 5Ghz band to only 20/40mhz? Reason: my laptops (Windows and Mac) keep disconnecting when using the 5ghz band 802.11ac but when connected to the 2Ghz, problem gone/never disconnects. Oh and I found that the 5ghz is mostly connected to 80mhz from the wifi scanners.

I know the that HG659 can set the wifi 5ghz to only use 20/40mhz channel width...not sure about the FritzBox 7490.

P.s. Router is pretty close to me..like 2 steps to get there.

P.s.1 Have done a lot of wifi diagnostic. Just a friendly fyi :D.

michaelmurfy

Mr Snotty
8923 posts

Uber Geek

Moderator

Trusted

Lifetime subscriber

# 2274900 11-Jul-2019 23:08

One person supports this post

Have you set a band outside of the DFS bands manually? This is the likely reason. There shouldn't be a need to reduce the channel width.

This sounds like to me that your router is picking up Radar and switching the band. You can see this happening in the Fritz!Box logs.

For what it is worth my MacBooks connect no problems (and stay connected) to the Fritz in my office.

lNomNoml

1376 posts

Uber Geek

# 2274914 12-Jul-2019 00:16

One person supports this post

Had a look on mine, wasn't able to find the setting.

rugrat

1840 posts

Uber Geek

# 2274925 12-Jul-2019 01:57

Try channel 40, mine was disconnecting because of weather radar. It's been heaps more reliable since I locked the channel.

If 40 is congested where you are, think there's other ones outside rain radar range as well.

rugrat

1840 posts

Uber Geek

# 2274931 12-Jul-2019 03:57

lNomNoml:

Had a look on mine, wasn't able to find the setting.

After logging into Fritz, Wireless on left hand side, click, drop down menu which has radio channel. Click that.

Then should see where you can fix channels. They're on auto by default.

lNomNoml

1376 posts

Uber Geek

# 2275478 12-Jul-2019 18:12

One person supports this post

rugrat:

lNomNoml:

Had a look on mine, wasn't able to find the setting.

After logging into Fritz, Wireless on left hand side, click, drop down menu which has radio channel. Click that.

Then should see where you can fix channels. They're on auto by default.

Yeah but OP wants the channel width 20/40Mhz not channel.

Stacy88

10 posts

Wannabe Geek

# 2275479 12-Jul-2019 18:16

michaelmurfy:
Have you set a band outside of the DFS bands manually? This is the likely reason. There shouldn't be a need to reduce the channel width.

This sounds like to me that your router is picking up Radar and switching the band. You can see this happening in the Fritz!Box logs.

For what it is worth my MacBooks connect no problems (and stay connected) to the Fritz in my office.

Hi there,

Thanks for your input.

Yes, I have tried to set the wifi channels for 5ghz to auto and manual and still the issue persist. Regardless for setting it to the wifi channel range 30-40...

All I want is to be able to set the "channel width" to 20/40mhz. Not the channels..some devices do not go well with 80mhz which causes disruptions.

Stacy88

10 posts

Wannabe Geek

# 2275480 12-Jul-2019 18:18

lNomNoml:
rugrat:

lNomNoml:

Had a look on mine, wasn't able to find the setting.

After logging into Fritz, Wireless on left hand side, click, drop down menu which has radio channel. Click that.

Then should see where you can fix channels. They're on auto by default.

Yeah but OP wants the channel width 20/40Mhz not channel.

Yep, I am ONLY after the wanting to change the channel width to 20/40mhz. I am not interested in channels..Previously I was with Vodafone and they supplied me with the HG659 and that router had the option to change/adjust the channel width from 20mhz,20/40mhz and 80mhz. Though, no clue why I cannot find the option in the Fritzbox...not all devices can handle the 80mhz and Fritzbox making the channel width auto mode does not help...

P.S. Heres a +1 upvote since you seem to be the one who understands :D.

lNomNoml

1376 posts

Uber Geek

# 2275527 12-Jul-2019 23:09

It seems as far as I can tell that the Fritz set's this automatically and you can not manually adjust it, I did find this it mentioned here: https://service.avm.de/help/en/FRITZ-Box-Fon-WLAN-7490/012/hilfe_wlan_funkkanal

"In the default setting the FRITZ!Box uses channels 36 to 48 in the 5-GHz band. Enable this option if the FRITZ!Box should also use channels 52 to 140 in the 5-GHz band.

When using channels 52 to 140, please note that many wireless devices support only channels 36 to 48 so that in some cases no connections to the FRITZ!Box will be possible.

Above channel 52, the FRITZ!Box checks at regular intervals whether the radio channel used is also used by a higher priority radar source, like, for instance, weather radar. If this is the case, the FRITZ!Box automatically switches channels, with the consequence that the wireless device may lose its connection to the FRITZ!Box.

Wireless coexistence enabled
With this option the FRITZ!Box exploits the available channel bandwidth in busy wireless environments to the best possible extent by attempting to use radio channels with a bandwidth of 40 MHz or 80 Hz, respectively.

This means that the FRITZ!Box, depending on which generation of the IEEE 802.11n standard is used, can transport 150 to 450 Mbit/s over wireless LAN. Up to 1300 Mbit/s are possible with the IEEE 802.11ac standard. If not enough space is available in the radio spectrum to allow interference-free transmission on the channel with bandwidth of 40/80 MHz, the FRITZ!Box automatically reduces bandwidths to 20/40 MHz ("fallback") with a correspondingly lower transmission capacity."

Read here also near the end, this is a reported problem to seems: https://forums.whirlpool.net.au/archive/1973677

Stacy88

10 posts

Wannabe Geek

# 2276572 14-Jul-2019 22:59

Thanks for the response. Oh that's sad to hear that the Friztbox does not allow users to manually adjust the channel width...not all devices support 80mhz...oh well, looks like I will just connect tot the 2ghz SSID for my new devices. Can't believe this problem was reported but never got fixed besides a factory reset (which I have done already but issue still remains..). Thanks for all your help. P.S. Have set your reply as the answer. Thanks