Hi.
I have 2xMT with 1 r52n to r52n. One is ap, second station wds.
802.11N works well but when HT Tx/Rx chain0 and chain1 are enabled Tx/Rx CCQ drops to 50/50% (link speed is 65Mbs).
When i disable chain1 (rx and tx) CCQ rise to 90/100% and link speed is 135/135Mbs. Signal strenght always -60/-60
I tried to change channel, enable ANI, change HT extension channel and its still that same.
First it was router os 4.5, now is 5.0rc4 (with NV2 also).
For me it looks like chains disrupt each other.
Question is, is there any option that could fix it?

Sounds like chain 1 has a bad cable, antenna, something.

Could be half of the card is damaged, but more likely some issue of alignment, antenna, cable or pigtail.

I can enable chain0 and disable chain1, still same situation. So it looks like both cant be enable at the same time.

More info on your config please.

What antennas, what polarity, cables, etc, which antenna connected to which chain?

If you disable chain 0 and enable chain 1 what happens? both posts say you've disabled chain 1.

No matter wich chain i disable, one of two must be disable for good CCQ.
Signal is good so i dont think is equipment.

You didn't answer my questions, polarity, antenna, etc...

Good signal is not the only factor.

which routerboard u r using. i had some confusion about chains with rb711 too.. but so far some alignment seems to have fixed it.

I have X86.
One side 2x 28Dbii Pacific grid, second 2x23dbii flat panel, polarity is vertical on both antennas.

I made some researches:
HT tx/rx chain0/1 enabled = CCQ 50/50
tx chain0 dis, rest en = 100/100
tx chain1 dis, rest en = 100/100
rx chain0 dis, rest en = 50/50
rx chain1 dis, rest en = 50/50
So it looks like Ht rx has problem but:
Tx/rx chain0 dis = 90/5
tx/rx chain1 dis = 100/100

each chain has to be a different polarization

each chain has to be a different polarization

I did that and now I have Tx/Rx signal -55/-56 dBm and CCQ 90/95%, transmission is 100Mb/s full duplex.

Thanks for advice, it solved my problem.