Foxeer ELRS 2.4G Receiver LNA

This ELRS receiver features both a LNA / PA for improve reception strength and telemetry range.

More info about LNA / PA:

A Low Noise Amplifier (LNA) directly adds to your incoming RSSI. Typical gains are in the ballpark of +12dBm which will be observed in the RSSI as being 12dBm higher than it would have been without the LNA. This is because the LNA amplifies the incoming signal coming from the antenna before going to the RF chip, which increases the sensitivity of the receiver by boosting the incoming signal. An LNA also boosts the noise by the same amount so the sensitivity limit will likely be lower than the value quoted by the Lua.

A Power Amplifier (PA) boosts the outgoing signal strength and extends the telemetry range back to the TX. Without a PA, the power output is limited by the RF chip’s max power output itself (around +13dBm 20mW). It works the same way as turning up the power output on the transmitter module, however it is not adjustable. The receiver’s output can be ran at adjustable power levels given range needs. Most PAs are 20dBm/100mW, meaning the telemetry transmit power can be adjusted to 10, 25, 50 or 100mW.