2 pcs SA818 high-integrated Embedded UHF VHF walkie talkie module
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
*38 CTCSS
*166 CDCSS
*8 level squelch
*8 adjustable volume
*high/ low power is optional (500 mw)-1w
*wide range of working voltage 3.3 to 5.5 V
*1 ppm KDS TCXO crystal
Application:
*small walkie talkie
*Invisible intercom system
*Sport products
*building community security system
*audio surveillance system
Package included:
-
2pcs UHF Walkie Talkie Module SA818
If you need VHF(134~174MHZ ) frequency, just leave message please.
Shipment: Free shipping by China post airmail
