ExpressLRS Diversity Receivers: Radiomaster RP3 and BetaFPV SuperD

by Oscar
Radiomaster Rp3 And Betafpv Superd Expresslrs Elrs Diversity Receivers Rx Compare

ExpressLRS is ridiculously great for long range, but diversity receivers can take it to the next level! In this post I will feature a few popular and latest ELRS diversity RX options and explain their features.

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New to ExpressLRS? Check out my complete guide to ELRS 2.4GHz.

Why Diversity Receivers?

If you want to get the best possible range and signal, and do not mind paying a few more dollars and adding a couple more grams to your model, ExpressLRS diversity receiver is the way to go.

Most people probably won’t benefit a lot from diversity receivers if the maximum range has not yet been reached on the single antenna receiver. But for those who fly long range, diversity receivers are great on quads as well as planes. Anyway, these diversity receivers are so light, they won’t impact flight performance much even on micro drones either, so why not?

Why TCXO?

TCXO stands for temperature compensated crystal oscillator.

All transmitters and receivers works on a certain frequency. Both TX and RX must operate at the same frequency to maintain a strong link. The precision of the frequency depends on the crystal oscillator.

Older ExpressLRS hardware used low quality crystal oscillators which results in high error, which is even worse in extreme temperature. TCXO is much more robust in this regard as it ensures your receiver has a stronger link with the transmitter, even in extreme high or low temperature.

BetaFPV SuperD

Betafpv Superd Expresslrs Elrs Diversity Receivers Rx Antennas

Where to Buy?

Get the BetaFPV SuperD Diversity Receiver here:

Betafpv Superd Expresslrs Elrs Diversity Receivers Rx UnboxIt comes with two antennas, two transparent heatshrinks, and 4x 30awg silicone wires.

Specs and Features

  • ExpressLRS 2.4GHz
  • MCU: ESP32 PICO D4
  • RF Chip: SX1280 (SX1281) x2
  • Antenna Connectors: IPEX MHF 1 (U.FL)
  • 2x T Dipole Antennas, wire length 70mm
  • Telemetry Power: 20dBm (100mW)
  • Maximum packet rate: 500Hz / F1000Hz
  • Minimum packet rate: 25Hz
  • Input Voltage: 5V DC
  • PCB Size: 22mm*14mm*3mm
  • Weight: 1.1g excluding antenna, 3.4g including both antennas
  • FW Target: BetaFPV 2.4GHz => SuperD 2.4GHz RX

It’s almost twice as big as the BetaFPV Lite receivers. It has two dipole antennas, BetaFPV recommends to place both antennas vertically and as far apart as possible to achieve ideal results. However further testing will be required to verify this.

The BetaFPV SuperD receiver uses “true diversity”, meaning there are basically two separate receivers onboard working simultaneously. They share the same processor and crystal oscillator, but each receiver has its own RF chips and antenna, and it will simply pick the stronger signal.

It comes with ExpressLRS V3.0.0 firmware pre-installed. Firmware target is already available in the configurator for flashing: BetaFPV SuperD 2.4GHz RX.

BetaFPV boasts a high-quality TCXO (temperature compensated crystal oscillator), which offers far more accurate frequency and stable signal even in extreme temperatures for long range flying. The frequency of the crystal oscillator shifts due to change in temperature, meaning your range can suffer when it’s either too cold or too warm. This TCXO can give you more consistent performance regardless the temperature outside.

 

Betafpv Superd Expresslrs Elrs Diversity Receivers Rx Top

The status indicator is a single RGB LED. The packet rate is shown by using different colour on a rainbow spectrum, which is really clever and unique. I have not seen this on any other products before.

Betafpv Superd Diversity Receiver Rbgled Status Indicator


Radiomaster RP3

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Where to Buy?

Get the Radiomaster RP3 from:

Radiomaster Rp3 Expresslrs Elrs Diversity Receivers Rx UnboxIt comes with two antennas, a transparent heatshrink and a manual. No electrical wires are included.

Specs and Features

  • ExpressLRS 2.4GHz
  • MCU: ESP8285
  • RF Chip: SX1280IMLTRT
  • Onboard LNA/PA chip
  • Telemetry RF power: up to 100mW
  • Antenna Connector: IPEX MHF 1 (U.FL)
  • T Dipole Antenna x2, wire length 65mm
  • Maximum packet rate: 500Hz / F1000Hz
  • Minimum packet rate: 25Hz
  • Input voltage: 5V
  • Dimension: 22mm*13mm*4mm
  • Weight: 4.6g 4.8g (Including two antenna)
  • FW Target: RadioMaster 2.4GHz => RP3 Diversity 2400 RX

It’s about twice as big as the RP1 and RP2 receivers.

Note that the RP3 has antenna diversity, not receiver diversity. It has two antennas, but only one RF receiver chain instead of two. It’s a compromise between performance and cost as it uses fewer chips than the “real diversity” receivers. Still, antenna diversity offers improved signal stability and range over the cheaper single antenna designs.

It has LDA (low noise amplifier) and PA (power amplifier) chip which improves signal stability and telemetry range. Telemetry requires the receiver to transmit signal back to the radio, and the power amplifier can boost telemetry signal.

The RP3 has ELRS V3.0 pre-installed, firmware is already available in the configurator for flashing, target is Radiomaster RP3 Diversity 2400 RX.

Radiomaster Rp3 Expresslrs Elrs Diversity Receivers Rx Top Radiomaster Rp3 Expresslrs Elrs Diversity Receivers Rx BottomManual:

Radiomaster Rp3 Expresslrs Elrs Diversity Receivers Rx Manual

There’s a mistake in the manual regarding telemetry output power, it says 250mW but it should be 100mw. This has been confirmed with Radiomaster.

Happymodel TCXO EP1 Dual

Happymodel has released a new ELRS receiver lineup with TCXO (temperature compensated crystals) built-in, EP1, EP2 and EP1 Dual.

I will be doing a comparison when this receiver comes in. It has the same multicolored LED for status indication like the BetaFPV SuperD.

Specs:

  • ESP32 PICO D4, dual SX1280(SX1281)
  • Antenna connector: IPEX MHF 1/U.FL
  • RF Frequency: 2.4GHz (2400~2480MHz)
  • Telemetry power: >19dbm
  • Receiver protocol: CRSF
  • Input voltage: +5V DC @ “+” pad
  • PCB size: 19mm x 14mm
  • Weight: 1g (excluding antenna)
  • Built-in a TCXO (temperature compensated crystal oscillator)
  • Firmware: HappyModel EP1 Dual 2400 RX (starting from ExpressLRS V3.0)

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10 comments

Sunsha73 3rd January 2023 - 2:49 pm

Hello !
I can’t figure out how many channels I will have with one of these receivers and a Zorro ELRS for example.
Can someone explain to me please ?

Reply
Matt 6th January 2023 - 7:23 am

ELRS can support up to 12 channels. The first 4 are your controls from your sticks (roll, pitch, throttle, and yaw), and then you get 8 aux channels where aux 1 (channel 5) must be your arm/disarm channel. Hope this helps!

Reply
Sunsha73 3rd January 2023 - 2:25 pm

Hello !
I can’t figure out how many channels I will have with one of these receivers and a Zorro ELRS for example.
Can someone explain to me please!
Ty

Reply
will 21st December 2022 - 11:42 am

can Radiomaster RP3 rollback firmware 2.X ? I have no plan to update ELRS 3.0 for all my quad.

Reply
Oscar 21st December 2022 - 11:56 am

check in the configurator and if you can find the receiver you want to flash in firmware 2.X. If not then it’s not possible.

Reply
Alex 18th November 2022 - 1:10 pm

Is the conclusion that the SuperD is better and longer range due to true diversity and slightly lower weight?
Also, for the RP3, on the radiomaster and RDQ sites it says max telememetry power is 100 mW, not 250 mW, do you know which is correct?

Reply
Oscar 19th November 2022 - 8:00 pm

There’s a mistake in the manual regarding telemetry output power, it says 250mW but it should be 100mw. This has been confirmed with Radiomaster.

Reply
Pranas 9th November 2022 - 6:49 am

> it’s recommended to place both antennas vertically and as far apart as possible to achieve ideal results.

What’s the logic behind it? People used to recommend doing vertical+horizontal with diversity.

Reply
Oscar 9th November 2022 - 11:40 am

This is just the manufacturer’s recommendation.

Reply
Jerky_FPV 8th November 2022 - 1:48 pm

Why not the EP1 Dual?

Reply