Ethos v1.5.7 and X18, X20 series User Manual
Internal module TD-ISRM (X18 and X20/S/HD)
For the TD ISRM Pro RF module please refer to the Internal Module TD-ISRM Pro section.
Overview
The internal RF module for the X18 and X20/S/HD radios is a new design that provides
tandem 2.4GHz and 900MHz RF paths. It can operate in 3 modes, i.e. ACCESS, ACCST
D16 or TD MODE.
Attention! In this manual and the radio menus ‘900M’ is a generic term denoting the
VHF band used. The actual operating frequencies are 915Mhz for FCC or 868Mhz for LBT
as applicable to the user’s country of operation.
State
The internal RF module can be On or Off.
Type
Transmission mode of the internal RF module. The X20/X20S models operate on the
2.4GHz and/or the 900MHz band. The ACCESS and TD (Tandem) modes can operate on
both the 2.4GHz and/or the 900MHz band simultaneously (or individually), while the
ACCST D16 operates only on the 2.4GHz band. The mode must match the type supported
by the receiver or the model will not bind! After a mode change, carefully check model
operation (especially Failsafe!) and fully verify that all receiver channels are functioning
as intended.
ACCESS mode
In ACCESS mode the 2.4G and 900M RF paths work in tandem with one set of ACCESS
controls. There can be three 2.4G receivers registered and bound or three 900M
receivers registered and bound or a combination of 2.4G and 900M for a total of three
receivers.
In ACCESS mode with a combination of 2.4G and 900M receivers the telemetry for the
2.4G and 900M RF links are active at the same time. The sensors are identified in
telemetry as 2.4G or 900M. Please note that the 2.4G band supports 24 channels,
while the 900M band supports 16 channels.
There is a new ETHOS telemetry receiver source feature named RX. RX provides the
receiver number of the active receiver sending telemetry. RX is available in telemetry
like any other sensor for real time display, logic switches, special functions and data
logging.
Please refer to the ACCESS section below for configuration details.
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