400Mhz
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.
Specification
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℃ |
| Data Rate |
1200bps |
Programmable, Manchester bit format |
| Dimension |
TBD |
|
| Weight |
TBD |
|
TX Part Specification
| Item |
Specification |
Remarks |
| RF Output power |
10±0.7dBm |
@ 3.3V Room, Programmable |
| Occupied bandwidth |
9.8KHz |
Data rate @ 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 |
10msec 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)
