Price:
US$26.33
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All-in-one Walkie Talkie Module Kit SA828 VHF FM Transceiver Small Volume Embedded Wireless Interphone Module
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Feature:
Full frequency band 400~480 MHZ/134~174MHZ
Transmit receive frequency independent
Bandwidth 12.5/25 KHz
Output power up to 1W
Open distance is 4-5 km
High receiving sensitivity: -124dBm
Highly integrated small volume
38-level CTCSS analog sub-audio code (available with PC software and serial port)
166-level CDCSS digital sub-audio (PC software and serial port can be set)
8-level squelch
Volume external potentiometer adjustment
High and low power options (500mW-lW)
Wide range of operating voltage 3.3-5.5V
Built-in EEPROM, data power-down save
Stable with 1.5ppm TCXO crystal
Applications:
Small walkie talkie
Ignore the intercom system
Building community security system
Outdoor sports products
Audio monitoring system
Parameter | Test Conditions | MIN. | Typical | MAX. | Unit |
Operating voltage range | 3.3 | 4.2 | 5.5 | V | |
Operating temperature range | -30 | 25 | 70 | °C | |
Current consumption | |||||
Sleep current | <3 | uA | |||
Receiving current | 60 | mA | |||
Emission current (high power) | 650 | 750 | mA | ||
Emission current (low power) | 450 | 550 | mA | ||
Transmitting RF parameter | |||||
Operating frequency range | 400 | 480 | MHZ | ||
Transmit power (high power) | @VCC=4.0V | 28 | 29.5 | 31 | dBm |
Transmit power (low power) | 25 | 26.5 | 27 | dBm | |
Modulation sensitivity | ®1. 5Khz/2. 5KHZ Frequency offset | 10 | mV | ||
Audio modulation distortion | ®1. 5Khz/2. 5KHZ Frequency offset | 2 | 5 | % | |
Signal to noise ratio | ®1. 5Khz/2. 5KHZ Frequency offset | 38 | 40 | 45 | dB |
Adjacent channel power | @12.5K offset | -60dBc | dBm | ||
CTCSS modulation frequency offset | 0.35 | 0.5 | 0.75 | KHz | |
Receiving RF parameter | |||||
Receiving sensitivity | 13dB output voice signal ratio | -124 | dBm | ||
Receive signal to noise ratio | @1.5KHZ frequency offset | 45 | 50 | dB | |
Audio output amplitude | 2 | W | |||
Audio output impedance | 8 | ohm |
Pin number | Pin definition | Description |
1 | MIC+ | External microphone positive |
2 | MIC- | External microphone negative |
3 | VOX EN | Voice control enable pin, connected to “0” with voice control function, default “1” output |
4 | 1 | Frequency 16 channel 8421 code, 1st bit, default "1" output |
5 | 2 | Frequency 16 channel 8421 code, 2nd bit, default "1" output |
6 | 8 | Frequency 16 channel 8421 code, 8th bit, default "1" output |
7 | 4 | Frequency 16 channel 8421 code, 4th bit, default "1" output |
8 | H/L | RF high and low power pin, connected to “0” for low power, suspended for power |
9, 10, 11, 13, 21 | GND | Power ground |
14,15 | SPK | Audio output pin, external 8 ohm 2W speaker |
16,17 | VOL | Audio volume adjustment pin, external 100K adjustable potentiometer |
18 | RXD | Serial port receiving data port |
19 | TXD | Serial port send data port |
20 | PTT | Transmit/receive control pin, “0” is transmit; “1” is receive, default receive mode |
22 | VCC | External 3. 3~5V power supply positive |
23 | CS | Module sleep enable, "0" is the eye-open mode; "1" is normal work, the default is normal work. |
Package includes:
1 x SA828 intercom module
1 x Rod antenna
1 x USB adapter board (TTL interface)
1 x Speaker