Perhaps, we can detect a difference between the high and low pitch sounds. ![]() We might be able to work out the length from the volume and delay(you were careful to synchronise watches) of the received sound. You have a great idea! What happens if I shout into the tunnel and have a friend listen at the other end. We will assume that you don’t want to go in, because, well, your scared of the dark and don’t want to be hit by a train. Say you are standing at on end of a dark train tunnel and want to know something about what is inside. For an alternate analogy take a look at KirbyMicrowaves site. That sounds pretty complex, but it’s really not. “Atrévete a Entrar…”by Hadrian Fernandez is licensed under CC BY-NC-SA 2.0 It doesn’t hold a candle to the performance of a instrument grade piece of kit, but for the price, and used with care, it’s not too bad.Ī VNA is designed to inject a known frequency and amplitude source signal into a RF port and measure the relative amplitude and phase of this signal when received at a number at one, or more of it’s ports. Luckily, there are cheap alternatives now, such as the NanoVNA.
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