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Product Details

2pcs/lot Embedded long range 7Km – 10Km high power 4W output UHF talkie walkie modules kit SA858
SA858 is a professional 4W / UHF band walkie talkie module. Strong RF circuit, DSP, digitalinterface, and audio amplifier is built in. Besides Uart command, user can use our provided PCsoftware to configure all the parameters. The parameters includes: Tx frequency, Rx-frequency, TxCTCSS /CDCSS, Rx CTCSS/CDCSS , digital volume and SQ. To avoid the heating for this highpower walkie talkie, we have done special handling on the software with a strong heat sink added,which makes it has no problem for long time continuous working.When SA858 is connected with SA858-PJ, it is easy to organize a professional all in one walkietalkie system, the system include 16 predefined frequency channels, adjustable volume, configurableCTCSS/CDCSS. User need only to connect with power supply and speaker.Simplified interface and ultra small size make SA858 widely used in various applications andconveniently embedded into various handheld devices.
Product Picture:

  • Full band 400~480 MHz
  • Tx and Rx frequency can be set alone
  • Band width 12.5/25KHz
  • Output power up to 4W
  • Distance up to 7 to 10 km in Open area
  • High sensitivity: -124dBm
  • High integrated and small size
  • 38 CTCSS
  • 166 CDCSS
  • (can be set by PC software and serial port)
  • 8 adjustable digital volume
  • Analog volume adjustable limitless
  • High / low output power selection (1W-4W)
  • Wide range of working voltage 3.3-9V
  • Embedded EEPROM, data saved even power off
  • 1ppm TCXO, stable performance
  • Small professional walkie talkie
  • Invisible intercom system
  • Building community security system
  • Sport products
  • Handheld / Pocketable device
  • Audio surveillance system


Parameter Test condition Min. Typ Max. Unit
Operating voltage range 3.3 8 9 V
Operating temperature range -30 20 70 C
Power consumption
Sleeping Current ≤3 uA
RX current 60 mA
TX current (high output power) @ 8v, 424.75MHz 1400 1500 mA
TX current (low output power) 850 900 mA
TX current (high output power) @ 4V, 424.75MHz 1100 1150 mA
TX current (low output power) 650 700 mA
TX frequency parameter
Operating frequency range 400 450 480 MHz
TX current (high output power) @ VCC=4.0V 30 31 32 dBm
TX current (low output power) 26 27 28 dBm
TX current (high output power) @ VCC=8.0V 35 36 36.5 dBm
TX current (low output power) 30.5 31.5 32 dBm
Modulation frequency @ 1.5Khz/2.5KHZ frequency deviation 10 mV
Audio modulation distortion @ 1.5Khz/2.5KHZ Frequency deviation 2 5 %
Signal to Noise Ratio @ 1.5Khz/2.5KHZ frequency deviation 38 40 45 dBm
Adjacent Channel Ratio @ 12.5K offset -60dBc dBm
CTCSS Modulation frequency 0.35 0.5 0.75 KHz
RX frequency parameter
RX sensitivity 13dB output audio SNR -124 dBm
RX SNR @ 1.5 KHZ Frequency deviation 45 50 dB
Audio output power 2 W
Audio output impedance 8 OHm
Block diagram:

Application circuit:

Parameter setting:



Antenna is an important part in communication system. Its performance will influence the whole communication system. This module requires antennas impedance in 50oHm.

2)Accessory board:

To make it convenient to use, we have an accessory board SA858-PJ which can be used with SA858 walkie talkie module,the small board extend the pins of the module by the special FPC.

3)Heat sink:

This walkie talkie module is a high power wireless device,it will has bigger current during transmitting,so we have equipped module with a specialized heat sink.

Pin out definition:

Pin No. Pin name Description
1 MIC+ Connect positive of external microphone
2 GND Connect negative of external microphone or power ground
3 SPK/VOL Eternal connect 8 oHm and 2W speaker and volume adjust electronic equipment
4 SPK Audio output pin, external connect 8oHm and 2W speaker
5 H/L RF high and lower power pin,connect0 is lower power,off is high power
6 VOL Audio volume adjust pin,external connect 200K adjustable electronic equipment
7 GND External connect negative power
8 RXD Data receive serial port
9 TXD Data send serial port
10 VOXEN Volume enable pin,0 is open volume control function,1is close,default is1
11 PTT Send/receive control pin,0is send;1 is receive,default is receive
12 8 Frequency 16 channels, 8421code,No.8 bits,default is1output
13 4 Frequency 16 channels, 8421code,No.4 bits,default is1output
14 2 Frequency 16 channels, 8421code,No.2 bits,default is1output
15 1 Frequency 16 channels, 8421code,No.1 bit,default is1output
16 PD Module sleep enable,0 is sleep mode;1normal working,default is normal working mode
17 VCC Connect positive power
18 GND Connect negative power
19, 21 GND Connect antenna ground
20 ANT RF signal output,external connect 50oHm antenna
Mechanical dimension:

  • 2pcs * UHF walkie talkie modules with heat sink SA858
  • 2pcs * Heat Sinks
  • 2pcs * Accessory boards
  • 2pcs * 409MHz rod antennas
  • 2pcs * Speakers
  • 2pcs * Connecting wires
  • 1pc * USB bridge board

Item Specifics
Talk Range:
Storage Channel:
Frequency Range:
Brand Name:
Walkie Talkie Type:
Maximum Range:
Model Number:
Talkie Walkie module SA858
Output power:
High sensitivity:
Band width:
Adjustable digital volume:
Heat sink:
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Location *Estimated Shipping Time
United States 10-30 Business days
Canada, Europe 10-30 Business days
Australia, New Zealand 10-30 Business days
Central & South America 15-30 Business days
Asia 10-20 Business days
Africa 15-45 Business days
*This doesn’t include our 2-5 day processing time.

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Super hot! Several others have checked this out in the last few hours

2pcs/lot Embedded long range 7Km – 10Km high power 4W output UHF talkie walkie module kit SA858

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