Ethos v1.5.7 and X18, X20 series User Manual
ACCST D16 mode
In ACCST D16 the RF module becomes a single 2.4G RF path.
Please refer to the ACCST D16 section below.
TD mode
In TD mode the RF module is in a low latency long range mode using the 2.4G and
900M RF links in Tandem to work with the new Tandem receivers. Tandem supports 24
channels on both bands.
Please refer to the TD Mode section below.
Flex firmware options
When it comes to choosing the firmware version, most users simply use either:
(a) the LBT (Listen Before Talk) version if in the EU, which communicates on 868Mhz in
the 900M mode, or
(b) the FCC version in the rest of the world, which communicates on 915Mhz in the 900M
mode.
However, the Flex version offers the ability to switch between the two when using
ACCESS, ACCST D16, or TD modes.
The configuration screens change as shown above. Under Type you now have two
columns. The first one is for selecting the FrSky protocol (ACCESS, ACCST D16, or TD
mode).
The second column is for selecting FLEX915M or FLEX 868M.
When you select FLEX915M, the 2.4G band changes to FCC modulation. When you select
FLEX868M, the 2.4G band changes to LBT European modulation.
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