FrSky DHT RSSI configuration
The FrSky DHT is a flexible and relatively powerful 2.4 GHz transmitter. The kit comes as a DIY package with an RP-SMA connector which makes it easy to switch antennas. The communication is two-way allowing for both Tx and Rx signal strength indication (RSSI).
I will use the D6FR receiver in this setup.
To connect to the transmitter you need a USB-to-serial adapter. FrSky makes one with the necessary pin-header.
Plug the black header into the corresponding four pins on the transmitter. Power will be provided by the USB-port.