PTP Linl HT Chain 0 and 1 vs Chain 0 (Same Throughput)

Hello,

i have a PTP Link between RB433AH with R52Hn and another RG433AH with R52HN Card and a 23dBi dualpol Antenna on both sides.

The TX / RX Signal is about TX: -65 to -67 and RX -71 to -74
The CCQ is about: TX 100% to 95% to RX 100% to 95%
Throughput 14336 kb

I used 5GHz-A/N
20/40MHz Below
Data Rates 6, 9, 12 18 Mbps (no higher, because the other did´nt works stable)
HT both cahinas activ fpr TX and fpr RX
HT Supportet MCS ans Basic MCS nothing, because if i aktivated 1 it did´nt work stable
TX Power is 25dBi

I wondering about the poor Throughput.

The Throughput is the same, even if i trie to disable chain 1 for TX and RX…
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