2KM Long Range RF link kits with encoder and decoder
This is a super long range 315mhz RF link kit Comes with VCO , PLL technology, steady Frequency and super anti-jamming ability. You can directly use it with your project like wireless data transport and remote control etc.
Transmitter module :
Special Parameter :
Working Voltage: 6-9V DC
Frequency difference：min±75KHz max±150KHz
Launching power: 50mW(9V)
Encoder : PT2262
Receiver Sensibility: -105dbm
Emission Distance: 2000m in open ground
Size : 47.5 x 30 x 10mm
The transmitter module have one 23cm separate onboard antenna
When using this module, please erect it straight, and do not rely on other objects.
When using high power transmission board, please take special attention : when launching , please do not touch the launch antenna and do no touch the launch part on the circuit board.
2、Receiver module :
This is superregeneration Decoder Receiver
Decoder : PT2272
Size: 41x24x6 mm
It can be compatible with transmitter with 2262 chip ，315MHZ ，and 1.5M Timing resistor
Specialized superheterodyne receiving module has an inherent disadvantages :
when remote control signal is too strong and the module oscillation signal will be blocked, and unable to properly receive signal.
So at this time, you should be away for some distance (such as 10 meters) and then it can work normally.
In order to test whether the receiving modules work normally, give a 5 v dc voltag between the VCC and GND interface of receiving module, and connect light emitting diode with pin 10, 11, 12, 13, 17 interface respectively
When we press A button of trasmitter module, its corresponding pin 11 road LED will be light, until press the other button such as B key, pin 11 extinguish and pin 12 will be light.
Pin 17 interface is the effective decoding output port, no matter which button of the transmitter we push, it will become high level as long as decoding successfully, the transmitter stop transmitting immediately and it will extinguish
Warning: this kit is not suitable for data transfer but remote control. Safe for 2 commands/second
Encoding and Decoding :
The popular link is like this: MCU -> Encoder -> Transmitter ------ Receiver -> Decoder -> MCU
PT2262(Encoder) and PT2272(Decoder) are optional, their existence is to 1)avoid confusing when multiple RF links in range 2) isolate disturbance. You can integrate the encoding and decoding work to the MCUs on both side. Whenever there is no 315Mhz devices around, you may use it as direct cable connection.
It would better choose 7V dc power with stable voltage and good filtering (at least 470UF + 0.1 UF filter capacitance) .
Please be careful that high voltage will easily burned the module.
Then connect the power negative port with GND, and connect positive port with VCC and 13 pin at the same time, then the red led on this module will be lighted and send high frequency signal.
When the power supply voltage is 6V, the emission current is about 180 ma;
When the power supply voltage is 7V, the emission current is about 200 ma;
When the power supply voltage is 9V, the emission current is about 250 ma.
If you want to use this module with other systems with different oscillation resistance, please change the oscillation resistanceto between pin 15 of IC 2262 and pin 16 of IC 2262.
Click to download the manual
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