FR-Sky Dual frequency setup and redundancy
Posted: 01 Aug 2020, 10:46
Good morning all!
I am looking a the options for running a dual 2.4GHz and 868MHz setup with my Taranis. These are the options I think are available:
Common to both options:
- Get a module for the transmitter: FrSky R9M 2019 ACCESS 868MHz Module
Option 1:
- Slave a X4R receiver (or other 2.4GHz receiver with SBUS) to a master R9-Slim+ receiver
- Use one battery pack, or two packs and redundancy with diodes (as explained elsewhere in this forum)
- Telemetry through the R9-Slim receiver
Option 2:
- Use an FR-Sky Redundancy Bus 10
- One or two packs, with separate inputs to the Bus-10
- sbus input from two receivers into the Bus-10
- Telemetry through one of the receivers
- Option 2 advantages: overload protection on the servo outputs
Here are my questions:
- Are there any options I haven't considered (exclude options like buying the new dual band transmitter coming out soon!)?
- With option 2, how does the redundancy bus decide which receiver to take as correct? Is the assumption that one of them is a master receiver, and in the event of losing signal from this one, then the other receiver will be used.I think this is the arrangement with the receivers in option 1 - use the R9-Slim+ signal, and if there isn't one, then switch to the slave 2.4GHz receiver.
- Can I use ACCST with the 2.4GHz side, and ACCESS on the 868MHz side? I don't see any reason not to, since they are independent but I always prefer a positive confirmation!I am quite happy with the ACCST kit I have, but if I am going to buy new bits for the 900MHz side, I don't see any reason to flash them to use ACCST (unless there are other reasons which make the ACCST a better choice).
- Are there any caveats I haven't recognised?
Based on these factors, I think that option 2 is the safest, due to the overload protection on the servos, with option 1 a better choice if space is at a premium. Since I am exploring this as I am finally getting around to building my Moswey, I don't think I have any space issues (compared to my sport gliders)!
I am looking a the options for running a dual 2.4GHz and 868MHz setup with my Taranis. These are the options I think are available:
Common to both options:
- Get a module for the transmitter: FrSky R9M 2019 ACCESS 868MHz Module
Option 1:
- Slave a X4R receiver (or other 2.4GHz receiver with SBUS) to a master R9-Slim+ receiver
- Use one battery pack, or two packs and redundancy with diodes (as explained elsewhere in this forum)
- Telemetry through the R9-Slim receiver
Option 2:
- Use an FR-Sky Redundancy Bus 10
- One or two packs, with separate inputs to the Bus-10
- sbus input from two receivers into the Bus-10
- Telemetry through one of the receivers
- Option 2 advantages: overload protection on the servo outputs
Here are my questions:
- Are there any options I haven't considered (exclude options like buying the new dual band transmitter coming out soon!)?
- With option 2, how does the redundancy bus decide which receiver to take as correct? Is the assumption that one of them is a master receiver, and in the event of losing signal from this one, then the other receiver will be used.I think this is the arrangement with the receivers in option 1 - use the R9-Slim+ signal, and if there isn't one, then switch to the slave 2.4GHz receiver.
- Can I use ACCST with the 2.4GHz side, and ACCESS on the 868MHz side? I don't see any reason not to, since they are independent but I always prefer a positive confirmation!I am quite happy with the ACCST kit I have, but if I am going to buy new bits for the 900MHz side, I don't see any reason to flash them to use ACCST (unless there are other reasons which make the ACCST a better choice).
- Are there any caveats I haven't recognised?
Based on these factors, I think that option 2 is the safest, due to the overload protection on the servos, with option 1 a better choice if space is at a premium. Since I am exploring this as I am finally getting around to building my Moswey, I don't think I have any space issues (compared to my sport gliders)!