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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

Thanks Tom.

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Mike G8GYW

Well I'm a very lucky boy. I put a wanted ad in a radio magazine and found an SM-230 just 90 miles from home. It was in immaculate condition so I snapped it up for a very reasonable ?350.

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I see that it shares a common fault with the SM-220: the plastic flexible couplers split. Luckily these are easy to find on eBay..

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Mike G8GYW