kneedrag wrote:Further to note not only would the system have to be on the same GUID for this to happen but on the same set of Freq channels.
Given that FrSky uses the entire band, both systems would be using the same "set" of frequencies. FrSky say that there are different hopping sequences but it seemed very much as if those sequences overlapped for significant periods of time -- hence the effective interaction "coming and going" over time when the systems were left turned on simultaneously.
I don't know how FrSky handle the creation of their hopping tables but it looks *very* much as if it's derived from a hash of the GUID -- in which case: same GUID = same frequencies (sooner or later).
Due to this being a large flyin and the Spectrum range was fairly full it would not have helped them finding a free spot in the band and would have compounded the issue.
The FrSky system does not appear to be adaptive so it won't make any difference how many other users there are on the band as to which frequencies it uses. In this regard, it's the same as FASST and most other FHSS systems (except Hitec's AFHSS system when in its "scan" mode.