The built-in intelligent receiving/sending discrimination circuit does not require front-end equipment to provide receiving/sending switching control signals. The module works in the receiving state by default and amplifies the received signal. When the front-end equipment is detected to transmit external signals, it instantly switch to the transmitting and amplifying state. The transmission gain is manually adjustable, which is convenient for compatible wireless devices with different transmission powers. The receiving/sending link has a of isolation, and the receiving link can withstand strong external interference without causing self-excitation of the loop. Compatible with modulation methods such as LORA and /ASK/OOK/MSK/GFSK. Description: AB-IOT-510 series two-way signal amplification modules are designed for applications in the 510M (470MHz-520MHz) frequency bands. Its compact size and convenient use easier to design products for high-power and long-distance applications in this frequency band. (Note: Hand-held walkie-talkies cannot use this module to achieve the purpose of extending the transmission range due to their high transmission power.) Parameter: Working frequency band: 470MHz-520MHz Receiving gain: 11dB2dB Receiving noise figure: less than equal 2.0dB Transmission gain: 5dB-11dB (2dB) adjustable Recognition threshold for receiving and sending switching: -2dBm Input power range: 1dBm-25dBm Work status LED indication: Receiving status: green light is on, blue light is off Transmitting status: blue light is on, green light is off In TDD working mode, the blue light and green light flash alternately Colour:As Shown Material:plastic+metal Package Contents: 1 * patch Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.