400Mhz RF Module

400Mhz Module is a wireless communication modem for short-range, mainly using the 400Mhz band. It has a communication speed of 1200 bps to 2400 bps and has better diffraction compared to 2.4GHz modems due to its frequency characteristics. It is mainly used for street light control, remote meter reading, location control, etc.
A microcontroller is built-in, and if there is a separate external controller, it sends and receives data through UART or serial communication.

General Specification

Item	Specification	Remarks
Communication form	Half duplex
Oscillator Frequency	19.68MHz	TCXO used
RF Frequency	424MHz band	Programmable for narrow band
Channel Spacing	12.5KHz
Frequency Stability	±2.5ppm	-30~85°C
Data Rate	1200bps	Programmable, Manchester bit format
Dimension	TBD
Weight	TBD

TX Part Specification

Item	Specification	Remarks
RF Output power	10±0.7dBm	at 3.3V Room, Programmable
Occupied bandwidth	9.8KHz	Data rate at 2.4Kbps, Manchester
Supply current	39mA typically	With MCU 400MHz band, 10dBm
Modulation	GFSK	Gaussian FSK
Spurious Harmonics	<-40dB
RX TO TX Turn on time	1msec Typically	Loop Filter BW = 2,4KHz
Data input	NRZ	Sync, Data Clock Available
Deviation	2.4KHz	Programmable

RX Part Specification

Item	Specification	Remarks
Sensitivity	<-120dBm	At 3.3 Room, 1200bps
IF Frequency	307.5KHz
Inter-modulation Rejection	55dB Typically
Supply current	34mA Typically	With MCU
Spurious emission	<-55dB
RX TO TX Turn on time	10msec Typically	Loop Filter BW = 2,4KHz
Turn time(12.5KHz step)	16msec Typically	Loop Filter BW = 2,4KHz
BCH frame decoding time	1.8msec Typically	No Error, 8MIPS CPU

Physical Dimension(Unit : mm)