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AVIATION / Video & radio / REVIEWED 2026-09-11

E04Radio-control receiver

Receive pilot commands and exchange supported telemetry.

Manufacturers & products

The control receiver converts the pilot's radio link into flight-controller commands and returns telemetry. It is separate from the live-video receiver in the goggles.

American sourcing options appear first. A U.S. company or distributor label does not establish U.S. manufacturing. The origin notes identify the specific evidence and any limits.

manufacturer

ModalAI

M0184 ExpressLRS receiver

US-assembled control receiver with two sub-GHz radio devices and CRSF UART output. [1]

U.S. manufacturing claim

ModalAI states USA assembly/origin for the listed receiver configuration. The -1C country-of-origin-agnostic option may contain a CHN-marked STM32; verify SKU and lot rather than assuming all components are US-origin. [1]

Program / application

868/915 MHz ExpressLRS integration candidate; not a 2.4 GHz receiver [1]

Published manufacturing site: USA

Online catalog / ordering

Official product page provides a catalog or inquiry route; verify current stock, revision, firmware and connectors before ordering.

Product scope & qualifications
  • 3.3 V describes UART logic, not the receiver power-input specification.
  • Choose matching sub-GHz transmitter hardware and allowed regional frequency configuration.
View catalog & ordering
manufacturer

Spektrum / Horizon Hobby

SPM4651T

DSMX receiver with SRXL2 serial output and telemetry. [2][3]

U.S. company

Horizon Hobby's investor identifies headquarters in Champaign, Illinois. This establishes a US company connection, not the manufacturing origin of the Spektrum receiver. [2][3]

Program / application

Alternative control ecosystem; FC must support SRXL2 and the selected radio must support DSMX [2][3]

Company location: Champaign, Illinois, USA

Online catalog / ordering

Official product page provides a catalog or inquiry route; verify current stock, revision, firmware and connectors before ordering.

Product scope & qualifications
  • Do not connect as though it were an ExpressLRS receiver; protocols differ.
  • Manufacturer product page and an older manual disagree on dimensions and mass; confirm the shipping revision.
View catalog & ordering
manufacturer

RadioMaster

RP1 V2 ExpressLRS 2.4 GHz

Compact serial receiver with an external T antenna. [4]

U.S. connection unverified

The reviewed listing does not establish corporate domicile or manufacturing country; no US origin is claimed. [4]

Program / application

5-inch ExpressLRS 2.4 GHz candidate [4]

Online catalog / ordering

Official product page provides a catalog or inquiry route; verify current stock, revision, firmware and connectors before ordering.

Product scope & qualifications
  • The product page contains inconsistent radio-chip names; the example avoids asserting a chip revision.
  • Receiver firmware and transmitter settings must match; do not assume the version in older listing prose is what ships.
View catalog & ordering

What remains unverified

  • M0184 supply-input details should be checked in the integration documentation before wiring.
  • RadioMaster domicile and manufacturing origin were not established in the bounded reviewed source set.
  • Spektrum dimensional differences require revision confirmation before designing an enclosure.

Where it comes from

A company address is shown separately from a published factory location. Request the manufacturing site and lot traceability for the exact part when sourcing.

What to compare

  • Protocol ecosystem

    ExpressLRS and DSMX are not interchangeable; match transmitter, receiver and FC support.

  • RF band

    A 900 MHz receiver cannot bind to 2.4 GHz transmitter hardware merely through software.

  • Serial interface

    Check CRSF, SRXL2 or other protocol, inversion, UART availability and logic levels.

  • Supply · V

    Separate power input from UART signal voltage and allow for current transients.

  • Diversity architecture

    Two antennas, two radios and true diversity are different hardware arrangements.

  • Telemetry

    Check available data, return-link mode and integration rather than equating RF power with range.

  • Failsafe behavior

    Verify loss-of-link handling in the installed firmware and flight configuration.

  • Mount and provenance

    Allow for antenna routing, protection and revision-specific origin documents.

Selection & integration notes
  • Select the radio ecosystem before choosing the receiver; retain a separate video-link decision.
  • Use the correct FC UART wiring and confirm failsafe behavior with the actual firmware configuration.
  • An origin-agnostic SKU must not inherit a stricter sibling's provenance label.

Published product examples

2 REFERENCES

Specifications belong to the named product and configuration.

M0184ModalAI
RF bands
868 / 915 MHz[1]Use the appropriate regional hardware/firmware configuration.
UART signaling
3.3 V logic, CRSF[1]Signal level, not a power-supply rating.
Telemetry transmit power
50 mW[1]Manufacturer receiver telemetry rating; not electrical power consumption or guaranteed range.
Example sources [1]
RP1 V2RadioMaster
Input
5 V[4]Published receiver supply requirement.
Mass
2.2 g including antenna[4]Manufacturer package definition.
Board size
13 × 11 × 3 mm[4]Receiver board only; external antenna envelope is additional.
Example sources [4]

Sources & references

REVIEWED 2026-09-11

Manufacturer pages and technical documents support the linked claims. A review date is not a publication date or stock check.

  1. M0184 ExpressLRS receiver ModalAI · Publication date not stated

    868/915 MHz receiver, UART logic, telemetry, US assembly and SKU-specific origin caveat.

    Accessed 2026-09-11
  2. SPM4651T SRXL2 telemetry receiver Spektrum / Horizon Hobby · Publication date not stated

    DSMX/SRXL2 receiver compatibility and voltage; manufacturer product listing.

    Accessed 2026-09-11
  3. Horizon Hobby portfolio company Mill City Capital · Publication date not stated

    Investor identifies Horizon Hobby headquarters and main distribution center in Champaign, Illinois.

    Accessed 2026-09-11
  4. RP1 ExpressLRS 2.4 GHz nano receiver RadioMaster · Publication date not stated

    RP1 V2 supply, mass, frequency and included external antenna; manufacturing origin not established.

    Accessed 2026-09-11