I leave my 220 in line all the time, and turn it on for the first few transmissions from each transmitter so I can see what my signal looks like. (I'm one of those idiots who constantly tinkers with their audio train. Sometimes unexpected things happen...) ? ?I leave it off otherwise to save the CRT. ?Insertion loss is negligible as measured by VNA or watt meter (located just before the antenna).
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73,
Tom ai4th
Tom ai4th