Coral RF JR Aftermarket radio interface Modules

Coral RF – Aftermarket Radio Interface Modules for JR Bay Radios

Breathe New Life into Your Classic JR Radio with a Modern 2.4GHz Upgrade

What Is an “Aftermarket Radio Interface Module”?

An aftermarket radio interface module is a replacement RF module designed for the JR module bay—a standardized 5-pin interface delivering regulated 6V power, raw battery voltage, and a PPM signal carrying stick positions and channel data. These modules replace outdated 27/35/72MHz systems with modern 2.4GHz technology, requiring no internal modifications to the transmitter.

Many JR owners (PCM9XII, 9303, 9XII) face a common problem: their vintage radio cannot communicate with modern 2.4GHz receivers. Replacing the entire transmitter is expensive and sacrifices the legendary JR gimbal feel. The solution is simple—install a new 2.4GHz module into the existing JR module bay.

How an Aftermarket Module Works

1. The JR transmitter outputs a PPM signal via the 5‑pin connector.

2. The module’s microcontroller reads the PPM signal.

3. The RF chipset encodes control data into a 2.4GHz protocol (DSMX, FrSky, FlySky, etc.).

4. The RF chip transmits to a compatible receiver.

The module bay provides: Ground, regulated 6V, raw battery voltage, and PPM input. Any replacement module must support 4.5V–8.4V operation.

Coral RF – Complete Product Line for JR Aftermarket Modules

All modules are SPI‑controlled, compatible with Arduino/STM32, and ideal for JR replacement projects.

Key Module Specifications

N210AP (CC2500) – Low‑cost workhorse

• Data rate: 1.2–500 kbps; Modulation: OOK, 2‑FSK, GFSK, MSK

• RX current 13.3mA, TX current 18mA @ +1dBm

• Sensitivity -104dBm @ 2.4kbps, sleep 400nA

• Supports DSMX, FrSky D8/D16/XJT, FlySky AFHDS2A, Futaba SFHSS, etc. via open‑source Multi‑Protocol firmware

N704AS (CC2652R+CC2592) – Multi‑protocol high power

• Zigbee 3.0, Bluetooth 5.2 LE, Thread, 6LoWPAN

• TX current 160mA @ +22dBm, RX 9mA, sensitivity -102dBm @ 250kbps

• Range >500m line‑of‑sight, dimensions 35×18×3mm

N407AS (SX1280) – Maximum range & reliability

• LoRa® (‑132dBm @62.5kbps), FLRC (2Mbps), GFSK

• Output +22dBm, ranging engine for distance measurement

• Dimensions 29×21×3mm, IPEX antenna

• 30–50% longer range than typical 2.4GHz modules

Application Scenarios for JR Radios

Development & Support

Coral RF provides:

• Samples & dev boards for N201AP, N210AP, N704AS, N407AS

• Reference schematics (JR 5‑pin → SPI, voltage regulation)

• Driver code for CC2500 & SX1280 (Arduino, STM32 HAL, bare‑metal)

• RF test reports (sensitivity, current, compliance)

• Customization: shielding, PCB dimensions, logo, pre‑flashed firmware

All products are RoHS & HF compliant.

Why Choose Coral RF?

• Complete portfolio: 1dBm to +22dBm, CC2500 to SX1280 to CC2652R

• JR‑bay ready: 2.0–3.6V operation with LDO; safe from 6V JR power

• Open‑source friendly: drivers & community support

• Customization available

Ordering Information

Where to Find Coral RF

• Website: www.coralradio.com

• Contact: info@coralradio.com