SA828 is a high cost-effective full-featured walkie talkie module with 1.5W output power, it comes with built-in high performance microcontroller, narrow band RF transceiver IC and RF power amplifier, all parameters(CTCSS, CDCSS, SQ, Predefined channels etc.) can be easily modified by PC software, Users only need to add external power supply, speaker, and audio taper, then it becomes a miniature walkie talkie with 16 adjustable channels. Simplified interface and Ultra small size make this module widely used in various applications and conveniently embedded into various handheld.
Features
- UHF Frequency : 400~480 MHz
- VHF Frequency : 134~174 MHz
- 350 band frequency：320-400MHz (3 frequency bands are optional)
- Tx and Rx frequency can be set alone
- Bandwidth: 12.5 / 25 KHz
- Output power up to 1.5W
- Distance up to 4-5Km in open area
- High Sensitivity：-124 dBm
- High-integrated, Small Size
- External potentiometer to adjust volume
- 38 CTCSS (can be set via PC software and serial port)
- 166 CDCSS (can be set via PC software and serial port)
- 8 level squelch
- High/ low power is optional（500mW/1.5W）
- Wide range of working voltage: 3.3-5.5 V
- 1 ppm KDS TCXO crystal, Stable performance
Application
- Small walkie talkie
- Invisible intercom system
- audio surveillance system
- Outdoor Sport products
- building community security system
| Parameter |
Test condition |
Min |
Typ. |
Max |
Unit |
| Power supply |
|
3.3 |
4.2 |
5.5 |
V |
| Working Temperature range |
|
-30 |
25 |
70 |
℃ |
| Current Consumption |
| Sleep current |
|
|
≤3 |
|
uA |
| RX current |
|
|
60 |
|
mA |
| TX current（High power） |
|
|
800 |
900 |
mA |
| TX current（low power） |
|
|
350 |
450 |
mA |
| Transmitting RF Parameters |
| Frequency range |
UHF |
400 |
450 |
480 |
MHz |
| VHF |
134 |
150 |
174 |
MHz |
| Out power（high power） |
@VCC=4.0V |
30 |
31.5 |
32.5 |
dBm |
| Out power（low power） |
25 |
26.5 |
28 |
dBm |
| modulation sensitivity |
@1.5KHz/2.5KHz Frequency deviation |
|
10 |
|
mV |
| Audio distortion |
@1.5KHz/2.5KHz Frequency deviation |
|
2 |
5 |
% |
| Signal to noise ratio |
@1.5KHz/2.5KHz Frequency deviation |
38 |
40 |
45 |
dB |
| Adjacent-channel power |
@12.5K offset |
|
-60 |
|
dBc |
| CTCSS modulated frequency deviation |
|
0.35 |
0.5 |
0.75 |
KHz |
| RX frequency Parameter |
| RX sensitivity |
|
|
-124 |
|
dBm |
| RX SNR |
@1.5KHz Frequency deviation |
45 |
50 |
|
dB |
| Audio output power |
|
|
2 |
|
W |
| Audio output impedance |
|
|
8 |
|
OHm |
Typical application circuit
Pinout definition:
| Pin NO. |
Pin name |
Description |
| 1 |
MIC+ |
External microphone positive |
| 2 |
MIC- |
External microphone cathode |
| 3 |
VOXEN |
VOX enable , 0: enable VOX; leave open or 1 to disable VOX |
| 4 |
1 |
Encoding for 16 channel, 4bit organized the 16 channels. For example, if the bit is : 0110, it is channel 6. If it is 1001, it is channel 9. The Pin marked 8 means the maximum bit. The Pin marked 1 means the lowest bit. |
| 5 |
2 |
| 6 |
8 |
| 7 |
4 |
| 8 |
H/L |
High/low output power control; Leave open for high output power，low level to low output power. |
| 9 |
SPKEN |
Receive signal indicatie Pin, usually low level, turn high after receiving signal |
| 10,11,13,21 |
GND |
Exposed ground pad |
| 12 |
ANT |
Output for RF signal, External connect antenna with 50ohm |
| 14,15 |
SPK |
Output for Audio, External connect loudspeaker with 8 ohm /2W |
| 16,17 |
VOL |
Audio volume control, External connect 100K ohm rotary resistor |
| 18 |
RXD |
RXD of the module for UART, connect to TXD outside of the module |
| 19 |
TXD |
TXD of the module for UART, connect to RXD outside of the module |
| 20 |
PTT |
PTT of the walkie-talkie module, leave open or “1” is Rx, “0”is TX, Default receiving mode |
| 22 |
VCC |
External connect Positive supply 3.3~5V. |
| 23 |
CS |
“0” is for sleeping mode,”1” for normal working,， Default normal operation |
Mechanism Dimension:
