>External loops that affect the meters unequally with power
would never occur.<
Had one on an oil rig installation in the early '70s. Operating at 2MHz
(roughly), the SWR varied with the linear on and off - that was using both a
Bird and SWR meter made in house, which was a Bruene type. Suspecting
harmonics, I tried an extra LPF to no avail. Fixed it in the end by ferrite
rings on the coax feed to the antenna tuner, but I had suspicions we had a
rusty bolt effect somewhere to explain the non-linearities. I tend to use
ferrite rings on the tuner feed coax anyway, although my tuners are all remote.
73 Peter G3RZP
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