When you plan to update your JR FM Transmitter to the newest high-tech 2.4GHz system, CF9 is your correct choice.
Corona 2.4Ghz JR module replacement system.
The Corona 2.4Ghz system replaces the standard JR module on most JR PPM systems equipped with an FM module.

Compatible with JR radios include: 347,388,783,U8,PCM10,PCM10S,PCM10SX,PCM10IIs,8103,9303,MX-22,MX-24s

Specification For Transmitter Module
Operating Voltage Range : 6.0V-13.0V
Operating Current : 100Ma
Output Power---- 10mW-60mW
Resolution : 10bit

Specification for Receiver
CR8D---- Fast Spread 2.4G Receiver work with Corona RF.Module
Operating Voltage Range --- 4.8V-6V
Operating Current --- 30Ma
Specified Range --- 1.5km
Resolutiong ---10 bit
Latency ---- 22ms
Sensitivity -- -100dbm
Channel --- 2CH , 4CH, 6CH, 8CH

Includes:
1 x JR compatible RF module 2.4G
1 x antenna
1 x 2.4Ghz 8CH Receiver