SA818 is a cost-effective integrate professional walkie talkie module, it comes with built-in high performance microcontroller, narrow band RF transceiver IC and RF power amplifier,SA818 offer standard UART interface, which easy to configure the related parameters and control the TX/RX function, Users only need to add external audio amplifier, microphone and speaker, then it becomes a professional walkie talkie, Simplified interface and Ultra small size make this module widely used in various applications and conveniently embedded into various handheld.
Specification
| 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 |
|
|
≤1 |
|
uA |
| RX current |
|
|
60 |
|
mA |
| TX current（High power） |
|
|
650 |
750 |
mA |
| TX current（low power） |
|
|
450 |
550 |
mA |
| Transmitting RF Parameters |
| Frequency range |
UHF |
400 |
|
480 |
MHz |
| Frequency range |
VHF |
134 |
|
174 |
MHz |
| Out power（high power） |
@VCC=4.0V |
28 |
29.5 |
31 |
dBm |
| Out power（low power） |
25 |
26.5 |
27 |
dBm |
| Modulation frequency |
@1.5KHz/2.5KHz frequency deviation |
|
10 |
|
mV |
| Audio modulation distortion |
@1.5KHz/2.5KHz frequency deviation |
|
2 |
5 |
% |
| SignaltoNoiseRatio |
@1.5KHz/2.5KHz frequency deviation |
38 |
40 |
45 |
dB |
| adjacent-channel power |
@12.5K offset |
|
-60 |
|
dBc |
| CTCSS Modulation frequency |
|
0.35 |
0.5 |
0.75 |
KHz |
| Receiving RF Parameters |
| Receiving sensitivity |
|
|
-124 |
|
dBm |
| Receiving SNR |
@1.5KHz frequency deviation |
45 |
50 |
|
dB |
| Audio output amplitude |
|
|
700 |
|
mV |
| Audio Output impedance |
|
|
200 |
|
OHm |
Features
- UHF band frequency: 400~480 MHz
- VHF band frequency: 134~174 MHz
- 350 band frequency：320-400MHz (3 frequency bands are optional)
- Tx and Rx frequency, Tx and Rx CTCSS, CDCSS can be set alone.
- Band width: 12.5 KHz / 25 KHz
- Output power up to 1W
- Distance up to 4-5km in open area
- Sensitivity：-124 dBm
- High-integrated, Small Size
- 38 CTCSS
- 166 CDCSS
- 8 level squelch
- 8 adjustable volume
- High/ low power is optional（500mW/1W）
- Wide range of working voltage: 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
Typical application circuit
Pin Definition
| Pin NO. |
Pin name |
I/O state |
| 1 |
Audio ON |
Connected to audio power amplifier. When the module worked, it can control the extra audio amplifier automatically, it will output low level to turn on the amplifier and high level to turn off the amplifier. |
| 2 |
NC |
Not connected |
| 3 |
AF_OUT |
Audio output |
| 4 |
NC |
Not connected |
| 5 |
PTT |
Module Input, Transmitting/receiving control, "0" force the module to enter TX state; and "1" to Rx state |
| 6 |
PD |
Power Down control, "0" for power down mode; "1" for the normal work |
| 7 |
H/L |
high/low output power control; Leave open for high output power，low level to low output power. (Please kindly note: this pin can NOT be connected to VDD or high level of cmos output) |
| 8 |
VBAT |
Connect power positive |
| 9 |
GND |
Grounding |
| 10 |
GND |
Grounding |
| 11 |
NC |
Not connected |
| 12 |
ANT |
connect 50 ohm antenna |
| 13,14,15 |
NC |
Not connected |
| 16 |
RXD |
RXD of the module and connect to external TXD |
| 17 |
TXD |
TXD of the module and connect to external RXD |
| 18 |
MIC_IN |
Microphone or line in |
Mechanical Dimensions（Unit:mm）
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