Definitely need an antenna analyzer to sort things out.
The Steppir I have seen at ham shows has had the housing open so you could
see the mechanics whir and move. Likely, you could do that, and listen for
mechanical binding, as it starts up, or see lack of movement evenly on both
sides.
They claimed they have not had mechanical problems due to low temperatures,
or such.
To do that, they must have a loose fit of the teeth and holes in strip.
Once you open it up, if you can, it might be obvious if you power it on.
73 and GL,
Stuart
K5KVH
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