izoel wrote

Model : TL-WR941HP

Hardware Version :

Firmware Version : 3.16.9 Build 20170104 Rel.43360n

ISP :

I have problem with TL-WR941HP V1 when set Channel Width : Auto,
The router doesn't automatically switch to 40 Mhz when connected to Wifi client 40 Mhz enabled both laptops and gadgets (router still working on 20 Mhz mode), i must to set the router Channel Width : 40 Mhz to get this working, but sometimes non 40 Mhz device will failed when to connect to router.

w20grippy wrote

As you're saying router shows 20Mhz still inside and devices are of 40Mhz. However, does this make any signal drop or any throughput issue? I got signal drop with my WR941HP mostly when it is placed next to antoher router. Still don't know why it would happen but supposing that could be relating to unstable buggy firmware.I got similar feedback from customers to those i sold this exact unit. My router can pick the signal when antenna is removed but starts dropping signal simultaneously when antennas are mounted.

izoel wrote

Exactly,

On 20 Mhz only device :
Channel Width : Auto --> Signal Full, Throughput issue (only using 20 mhz bandwidth : capped to 72mbps/150mbps/225mbps link)
Channel Width : 40 Mhz --> Signal Drop, Throughput issue (only using 20 mhz bandwidth : capped to 72mbps/150mbps/225mbps)

On 20/40 Mhz device :
Channel Width : Auto --> Signal Full, Throughput issue (only using 20 mhz bandwidth : capped to 72mbps/150mbps/225mbps link)
Channel Width : 40 Mhz --> Signal Full, Throughput Full (full 150mbps/300mbps/450mbps link) but problem with 20 Mhz only device.

I have many TP-Link routers, but only wr941hp have the problem.