WL1837MOD: Disable U-NII bands

Jonathan

Part Number: WL1837MOD

I'm using the WL1837MOD and need to disable U-NII-2A and U-NII-2C bands (DFS channels) on my product for regulatory compliance testing. Can someone show me how to do that? Thanks.

over 1 year ago

0 Sabeeh Khan1 over 1 year ago

TI__Mastermind 23880 points

Hi,

Are you looking to disable only the DFS region or the entire 5GHz band?

0 Jonathan over 1 year ago in reply to Sabeeh Khan1

Prodigy 110 points

Hi, I want to disable only the DFS region (U-NII-2A and U-NII-2C). Thanks.

0 Sabeeh Khan1 over 1 year ago in reply to Jonathan

TI__Mastermind 23880 points

Hi Jonathan,

This should be doable with the ini file. We have a guide here: https://www.ti.com/lit/an/swru422a/swru422a.pdf

0 Jonathan over 1 year ago in reply to Sabeeh Khan1

Prodigy 110 points

Hi Sabeeh,

I looked through the ini file document but don't see any documentation regarding disabling all DFS channels. Could you please be more specific and send me the changes that should be added to the ini file I'm using to disable DFS channels? Thanks.

0 Sabeeh Khan1 over 1 year ago in reply to Jonathan

TI__Mastermind 23880 points

Sure Jonathan,

I'll have to look these up myself and that will take some time. Let me get back to you by early next week.

0 Jonathan over 1 year ago in reply to Sabeeh Khan1

Prodigy 110 points

Hi Sabeeh,

Any update on this request?

0 Sabeeh Khan1 over 1 year ago in reply to Jonathan

TI__Mastermind 23880 points

Hi Jonathan,

Take a look at section 6 of that guide. You will need to modify PerChanPwrLimitArr11ABG in your INI to limit the power (in this case 0) for the respective channels. Note that there are 24 bits (3 bytes) per channel. Here is the INI file for FCC_CE: https://git.ti.com/cgit/wilink8-wlan/18xx-ti-utils/tree/wlconf/official_inis/WL1837MOD_INI_FCC_CE.ini?h=R8.8

So this example would limit the power to 0dB on channel 1:

PerChanPwrLimitArr11ABG  =	      00 00 00 78 88 88 78 88 88 78 88 88 78 88 18 78 88 88 78 88 82 78 88 88 78 88 88 78 88 88 78 88 88 78 88 88 78 88 88 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F7 22 22 FF FF FF F7 22 22 FF FF FF F7 FF FF FF FF FF F7 FF FF F4 44 FF F4 44 FF F4 22 22 F4 22 22 F6 44 44 FF 44 44 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 55 FF 44 55 F4 FF FF FF 33 22 FF 33 22 FF 66 66 FF 44 66 F6 FF FF FF FF FF

You would just do the same for your channels of interest.

0 Jonathan over 1 year ago in reply to Sabeeh Khan1

Prodigy 110 points

Thanks Sabeeh. I noticed all the Japan channels are set to FF FF FF in the ini file. Does FF FF FF disable the channel completely whereas 00 00 00 sets the power to 0 dBm but the channel is still active?

0 Sabeeh Khan1 over 1 year ago in reply to Jonathan

TI__Mastermind 23880 points

FF FF FF on PerChanPwrLimitArr11ABG means no limit. So it would add 15dB to the PwrLimitReference11ABG.

0 Jonathan over 1 year ago in reply to Sabeeh Khan1

Prodigy 110 points

I pulled the wl18xx-conf.bin file but how can I extract the ini file for modification?

0 Sabeeh Khan1 over 1 year ago in reply to Jonathan

TI__Mastermind 23880 points

Hi Jonathan,

You can use wlconf to extract the parameters.

./wlconf -i $binary_name --get > wl18xx-conf-dump.txt

Find instructions on how to use wlconf here: www.ti.com/.../swra489.pdf

0 Jonathan over 1 year ago in reply to Sabeeh Khan1

Prodigy 110 points

Hi Sabeeh, I set all the DFS channels (Ch 52 - Ch 140) to 0 dBm in the ini. The power did drop on these channels, however they still measured around 7-8 dBm. I need to disable these channels completely. How can I do that? Is there a setting I can add to the ini file that completely disables the DFS region?

0 Sabeeh Khan1 over 1 year ago in reply to Jonathan

TI__Mastermind 23880 points

Hi Jonathan,

Except with those modifications in the INI, we don't have the ability to completely turn off specific channels in the 5GHz frequency band.

0 Jonathan over 1 year ago in reply to Sabeeh Khan1

Prodigy 110 points

Is there a method for disabling the entire 5GHz band and only enabling the 2.4GHz band?

+1 Sabeeh Khan1 over 1 year ago in reply to Jonathan

TI__Mastermind 23880 points

Hi Jonathan,

Yes this is possible. You can either manually change the parameters or use the wlconf script like below (the parameters you're interested in is at the end). You can set 5G_antenna to 0 and 2_4G_antenna to 1 or 2.

./wlconf -i $binary_name -o $binary_name -s wl18xx.phy.number_of_assembled_ant2_4=$number_2_4G_antenna
./wlconf -i $binary_name -o $binary_name -s wl18xx.phy.number_of_assembled_ant5=$number_5G_antenna

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WL1837MOD: Disable U-NII bands