Ran some tests on this link. AP side has no GPS (due to FM tower interference). Client side has great reception.
Using 2x20 channels with an MCS 8 on each stream. MAC is 208x208. If I run an internal bandwidth test using the radio test, it gives me 200 x 200 each time. Great looking link from an RF perspective.
However, if I run an internal iPerf test or a TCP bandwidth test, they both show 15 x 200 (at the client end).
Is this GPS related? Should I expect to see terrible download from an AP with no GPS sync? If so, can I simply swap which radio is the AP and which is the client (not physically but in the radio setting) and will the radio with good GPS send the sync data over the link to the radio without it and bandwidth improves?