TEW-824dru antenna chains

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Michael Hart
DD-WRT Novice


Joined: 18 Apr 2021
Posts: 4

PostPosted: Mon Apr 19, 2021 19:13    Post subject: TEW-824dru antenna chains Reply with quote
I have a TrendNet TEW-824dru onto which I've put the recommended DD-WRT build. It's a 3 x 3 antenna design, both in 2.4 and 5GHz ranges. I can configure 1+2+3 for both receive and transmit antennas for 2.4GHz and get the right maximum speed of 450mbps. However, when I look at the antenna chains field for 5GHz, it only has 1 and 1+2 options. There's no 1+2+3 option shown. This reduces potential performance from 1300mbps to 867mbps.

From what I can see, this is an error and it should have 1+2+3 available. Anybody able to confirm and maybe give some information on how I could change the antenna chains value to 1+2+3?

Many thanks.
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tatsuya46
DD-WRT Guru


Joined: 03 Jan 2010
Posts: 7482
Location: YWG, Canada

PostPosted: Mon Apr 19, 2021 19:38    Post subject: Reply with quote
probably nothing and would have to post a bug report https://svn.dd-wrt.com/timeline . not finding info on what radios are in it either..

but ssh/telnet into the router and post output of "iw list".

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BrainSlayer wrote:
we just do it since we do not like any restrictions enforced by stupid cocaine snorting managers

[x86_64] Haswell i3-4150/QCA9984/QCA9882 ------> r46885 std
[QUALCOMM] DIR-862L --------------------------------> r46885 std
[QUALCOMM] DIR-862L --------------------------------> r46885 std
▲ ACTIVE / INACTIVE ▼
[QUALCOMM] WNDR4300 v1 --------------------------> r46350 std
[BROADCOM] DIR-860L A1 ----------------------------> r46329 std


If you use DSLReports please enable hi-res bufferbloat.


Sigh.. why do i exist anyway..
kernel-panic69
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Joined: 08 May 2018
Posts: 8974
Location: Texas, USA

PostPosted: Mon Apr 19, 2021 19:56    Post subject: Reply with quote
The 824 is the same SoC as the 823:

https://deviwiki.com/wiki/TRENDnet_TEW-823DRU_V1.xR

https://wikidevi.wi-cat.ru/TRENDnet_TEW-823DRU_V1.xR

https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=288472

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Michael Hart
DD-WRT Novice


Joined: 18 Apr 2021
Posts: 4

PostPosted: Mon Apr 19, 2021 20:45    Post subject: Tew-824dru Reply with quote
Indeed, the TEW-824dru is basically identical from a hardware perspective to the TEW-823dru and as you can see from your links, it shows both 2.4 and 5GHz being 3 x 3. I've attached the output from an IW LIST command, which shows the 5GHz as only having 2 antennas for some reason.
tatsuya46
DD-WRT Guru


Joined: 03 Jan 2010
Posts: 7482
Location: YWG, Canada

PostPosted: Mon Apr 19, 2021 21:28    Post subject: Reply with quote
have u looked inside the router to confirm its not a modified version of the qca9880 for whatever reason?

(never heard of a modified 9880 to remove a chain, + despite specs saying ac 1300, but oems do dumb things all the time)

_________________
LATEST FIRMWARE(S)

BrainSlayer wrote:
we just do it since we do not like any restrictions enforced by stupid cocaine snorting managers

[x86_64] Haswell i3-4150/QCA9984/QCA9882 ------> r46885 std
[QUALCOMM] DIR-862L --------------------------------> r46885 std
[QUALCOMM] DIR-862L --------------------------------> r46885 std
▲ ACTIVE / INACTIVE ▼
[QUALCOMM] WNDR4300 v1 --------------------------> r46350 std
[BROADCOM] DIR-860L A1 ----------------------------> r46329 std


If you use DSLReports please enable hi-res bufferbloat.


Sigh.. why do i exist anyway..
Michael Hart
DD-WRT Novice


Joined: 18 Apr 2021
Posts: 4

PostPosted: Mon Apr 19, 2021 21:32    Post subject: TEW-824dru Reply with quote
From what I can see, it's not modified. Also, when running the original TrendNet firmware, it shows as AC1300. Seems to me like a driver or similar issue. Maybe a table entry needs updating?
Michael Hart
DD-WRT Novice


Joined: 18 Apr 2021
Posts: 4

PostPosted: Wed Apr 28, 2021 15:04    Post subject: Fault report Reply with quote
I've raised this as a fault.

https://svn.dd-wrt.com/ticket/7403
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