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DG-ROSA Sereiae Sem Fio 433MHz DIY Sistema de Alarme Autônomo Alarmes de Segurança Residencial Multifunção Conjunto de Anfitrião e Sereiae

23% OFF DG-ROSA Sereiae Sem Fio 433MHz DIY Sistema de Alarme Autônomo Alarmes de Segurança Residencial Multifunção Conjunto de Anfitrião e Sereiae US$19.99 US$25.99 View It

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Waterman 17/04/2019

I bought a Digoo 433 MHz Window Door Sensor, together with the Digoo DG-ROSA 433MHz wireless DIY Standalone Alarm system. It all Works perfectly as advertised. I use the alarm system to secure a boat, at a distance of 35 meters from my house. Therefore I needed more range. So I soldered a piece if wire of 35 cm to the unit (35 cm = 1/2 Wavelength, which is 70 cm). This piece of wire functions like an antenna and effectively doubles the range. (See photo, to see where to solder the antenna wire to the Door Sensor unit.)

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