868/915 Mhz as a viable frequency for submarines.

tsenecal wrote:Sadly,  the problems that you and i have had getting all these receivers to work has not helped my opinion of FrSky's work in the 900mhz area vs others like ExpressLRS (still my favorite) and TBS.


But it is nice to know that I know have an entire suite of 4 different protocols in the 900mhz frequency range to test and post my results on.

Because so many people have problems with frsky r9, I have been able to pick up modules for around £20 each because no one wants them.

I looked at Crossfire but its far more expensive, The mavlink telemetry implementation has a lot of problems and there is no way to have a 1W bidirectional link. ExpressLRS is all about low latency, there is a version for mavlink but its experimental at the moment.  The only other options for that are dragonlink and the RFD900 but you are still looking at over £200 for a set compared to £40 for a pair of R9M modules.

yep,

once i discovered the matek crsf pwm boards for the expresslrs receivers, i have basically standardized on expresslrs. the new v2 tbs crossfire stuff is considerably cheaper, but not as cheap as the expresslrs stuff.

and the betafpv 915mhz nano transmitter module fits perfectly on the tandem XE, as well as the radiomaster zorro. I just picked up two of the betafpv superd diversity receiver. i want to test that against a standard receiver and see if properly orientated antennas help any.


both tbs and elrs make r9 look like a much lesser 3rd place product. the only 900mhz product that is of less use to us is the jeti duplex stuff. that makes tbs v1 stuff look cheap, and 900mhz is only a secondary receiver. it can never be used as the primary receiver.