A Receiving Antenna Switcher with an Espressif Brain

It is not uncommon for a radio enthusiast to have multiple antennas for the same radio, so you would expect it to be quite normal to have a bunch of coaxial wires hanging around the back of the rig to rotate it. If it describes your radio experience, you may be interested in the built in antenna switcher [g3gg0]Which uses a solid-state RF switch controlled by an ESP32 module.

At its core is the MXD8625C RF switch, a small device designed for cellular phone applications that provides only a fraction of a dB insertion loss and somehow negates the need for blocking capacitors. It is controlled by a GPIO line, and he attached a bracket to allow the distribution of three antennas on several radios, including the convenient option to switch to a preamplifier if necessary. Of further interest we note that the device is also suitable for transmitter switching, with a maximum of 36.5 dBm throughput which we calculate is about 4.5 W. This board is for a fairly acceptable use, but probably anyone interested in considering the chip. A transceiver project. The software is already a relatively simple web-based control that links on-screen controls to GPIO.

If you are interested in solid state RF switches, it is important to keep in mind that they can be very simple at low frequencies.

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