3

It doesn't know anything. "STE" is the easier one to explain. It controls transmit, not receive. When STE is enabled, when you let go of the PTT button, the radio will send a 55Hz tone for a moment. Other Baofeng radios mute the receive when they hear a 55Hz tone... whether or not the STE option is enabled, whether or not you want it. It has no (...


3

Yes, your diagram makes sense. And yes, it's doable, given that your amp operates within the power limits of the duplexer and the antenna, and the duplexer isolates the receiver from enough of the amplifier's output. Every solid-state rig that outputs more than a watt has a power amp inside of it already, so it's not a question of "can it be done" ...


2

The transmitter doesn't need protection from the receiver, because the receiver doesn't transmit any signal. Indeed. The notch filter in the transmit side is instead to protect the receiver from the transmitter. As well as the familiar harmonics and spur signals generated on specific frequencies by the transmitter it also produces broadband noise centred on ...


2

Possible, yes. A good idea as your plan for emergency communication while hiking on a remote and hazardous trail? I wouldn't count on it. As you've already observed, although there are repeaters along the way, you have to know what they are, you have to be in range of them, and someone has to be listening. Consider the things that could go wrong: You ...


1

The transmitter doesn't need protection from the receiver, because the receiver doesn't transmit any signal. Perhaps not, but consider: The transmitter makes broadband noise and intermodulation products that may fall on the receive frequency. More isolation is better. And, The transmitter should ideally also not load the antenna at the receive frequency. ...


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