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PDF DRA818V Data sheet ( Hoja de datos )
| Número de pieza | DRA818V | |
| Descripción | VHF Band Voice Transceiver Module | |
| Fabricantes | Dorji | |
| Logotipo |  |
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DRA818V
VHF Band Voice Transceiver Module
Features:
Frequency Range: 134~174MHz
Tx/Rx frequency independent
Channel space: 12.5/25KHz
Configurable multi-channels
Sensitivity: -122dBm
Output power: +27/30dBm
CTCSS / CDCSS codes
8 volume levels
8 squelch levels
UART interface
Temperature: -20°C ~+70°C
TX current: 450/750mA
Supply voltage: 3.3~4.5V
DRA818V
V1.21
Applications
Portable walkie-talkie
Outdoor sports products
Audio monitor system
Building security system
DESCRIPTION
DRA818V is a type of compact wireless voice transceiver module based on RFIC RDA1846 and
works in VHF band. It integrates high speed microcontroller, high performance wireless
transceiver IC, high power PA, audio process and squelching circuits. It provides standard UART
interface which users can easily configure appropriate parameters for different applications. Users
can easily construct a walkie-talkie system by connecting microphone, audio PA and speaker.
ANT
H/L
BAT
PD
GND
H/L
PA Driver
PA ANT SW
CTC/CDC
CODE
LNA
Filter
DSP
RF Transceiver
AF D/A
AF OUT
Audio ON
AMP
MIC A/D
MIC_IN
PTT PTT
RSSI
UART
TXD RXD
Figure 1: DRA818V Functional Block
Revision 1.21
Page 1 of 10
July. 2014
1 page  
Module response: +DMOCONNECT: x<CR><LF>
DRA818V
GBW:
Channels space. 012.5k; 125k
TFV:
Transmit frequency. Range: 134.0000~174.0000MHz
RFV:
Receive frequency. Range: 134.0000~174.0000MHz. The frequency should be the
times of 12.5KHz or 25KHz.
Tx_CTCSS: CTCSS value in transmit
SQ:
Squelch level (0~8). 0 monitor mode which can’t be used in scanning mode.
Rx_CTCSS: CTCSS value in receive
x:
Configuration result. 0 succeeded; 1 data out of range.
E.g. Command: AT+DMOSETGROUP=0,152.1250,152.1250,0012,4,0003<CR><LF>
Or Command: AT+DMOSETGROUP=0,152.1250,152.1250,754N,4,445I<CR><LF>
Response: +DMOSETGROUP:0<CR><LF>
Notes: The Tx_CXCSS and Rx_CXCSS can be different values. 0000 no coding; 0001~0038 CTCSS;
AlphanumCDCSS (seeing table 6).
3. Volume Command
Description: This command is used to adjust the volume of module.
Format:
AT+DMOSETVOLUME=x <CR><LF>
Module response: + DMOSETVOLUME: X<CR><LF>
x in command: Volume range (1~8).
x in response: 0 succeeded; 1failed.
4. SETFILTER Command
Description: This command is used to turn on/off Pre/de-emphasis, Highpass, Lowpass filter
Format:
AT+ SETFILTER=PRE/DE-EMPH,Highpass,Lowpass <CR><LF>
Module response: + DMOSETFILTER: x<CR><LF>
PRE/DE-EMPH=0turn on; 1turn off
Highpass=0turn on; 1turn off\
Lowpass=0turn on; 1turn off
E.g AT+SETFILTER=0,0,0
Response: + DMOSETFILTER:0
From the field testing results, the RFIC on module should automatically filter the frequencies
below 300Hz no mater Highpass filter is enabled or not so please pay attention to it if the
applications need low frequency.
Revision 1.21
Page 5 of 10
July. 2014
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| PDF Descargar | [ Datasheet DRA818V.PDF ] | |
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