Electronic – What does ‘isolation’ mean in a radar antenna system spec text? How to measure it

Trying to think what 433 is used for off the top of my head :) Is that the weak signals band?

At any rate, most 2-way radios are made to match up to a 50ohm antenna and the matching is left up to you. You can get an antenna that is already tuned, or you can do impedence matching through a number of techniques (see the referenced article below).

With a good match, you reduce standing waves. Standing waves build up when the radio sends out a nicely modulated signal but the antenna isn't resonating at that frequency and causes standing waves, which feed right back into the radio and can blow out the final stage.

The higher the output power, the more this becomes important. At very low power, say <1watt, the worst you have to worry about is the antenna not resonating and your signal not going anywhere. At higher powers, say 50+ watts, you can damage your transmitter in less than 1 second. Modern radios have built-in SWR detectors that will cut the power if it detects a problem. Those aren't always guaranteed to work though.

This page lays out a few key things verey nicely

You always need to take into account cable losses in your signal, but over 0.5m your loss should be relatively small. As you look at cabling take into account the dB loss per meter and use that to determine how much power you are losing each way. CLF seems to be a way to avoid specifying a value most places I can find.

It stinks of marketing to me.