2pcs UHF Walkie Talkie Module SA818S (SA818S is pin to pin compatible with old version SA818)
If you need VHF(134~174MHZ ) frequency, just leave message please.
SA818 is a low cost but high performance integrated walkie talkie module.With built-in high performance microcontroller, narrow band rf transceiver and standard UART interface it can be easily used and succeed all the walkie talkie function with good quality voice and long distance transmission. Users only need to connect external audio amplifiers, microphone or speaker with this module ,then it can work as a small walkie talkie with 1W output. In open area, it can easily achieve 3.5 - 5Km communication. Simplified interface and ultra small size make this module a wide range of applications, also can conveniently embed into various handheld devices,to improve the comprehensive performance of end products.
Product Picture:
Electronic Specifications:
Parameter
Test condition
Min
Typ
Max
Unit
Power supply
3.3
4.2
5.5
V
Working Temperature range
-30
25
85
C
Current consumption
Sleep current
@ PD = 0V
≤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
-60dBc
dBm
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
Pin NO.
Pin name
I/O state
Description
1
Audio ON
O
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 connceted
3
AF_OUT
Audio output
4
NC
Not connceted
5
PTT
I
Module Input, Transmitting/receiving control, "0" force the module to enter TX state; and "1" to Rx state
6
PD
I
Power Down control, "0" for power down mode; "1" for the normal work
7
H/L
I
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
VDD
Connect power positive
9
GND
Grounding
10
GND
Grounding
11
NC
Not connceted
12
ANT
connect 50 ohm antenna
13,14,15
NC
Not connceted
16
RXD
I
RXD of the module and connect to external TXD
17
TXD
O
TXD of the module and connect to external RXD
18
MIC_IN
Microphone or line in
Features:
*Frequency: 400 ~ 480 MHz (UHF) or 134~174MHZ (VHF)
*Tx and Rx frequency, Tx and Rx CTCSS,CDCSS can be set alone.
*Band width 12.5/25KHz
*Output power up to 1 W
*Transmission distance up to 3.5 to 5 km in Open area
*Sensitivity: -124 dBm
*Small size
*Built-in EEPROM, data kept unchanged even powered off
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