On 25/12/2020 11:50, Harry Bloomfield wrote:
Brian Gaff (Sofa) wrote on 25/12/2020 :
Why should it have anything to do with FM as a modulation type? An
amplifier needs many attributes, one of the problems with wide band
amplifiers is overload with strong signals If that occurs then the
resulting non linear effects cause mixing to occur, and then the band
is full of spurious stations made up from bits of those already there.

Brian - The description of the item bears no relationship to the actual
item which is for sale. The actual item is some sort of mechanical
equipment - not radio based equipment. It's some sort of strange mixup
by the seller.

I thought it was some kind of torture/exercise device.

Further down:

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Featu

€¢ PGA hand-cranked grinder, used with a full-surface grinding machine,
with a simple pressing roller for convenient grinding.
€¢ Double roller design, no need to adjust the center, hold the workpiece
between the wheels when holding, you can get concentric circles.
€¢ The left and right direction of the rotating roller can be adjusted to
make the workpiece or retreat and then grind.
€¢ The pressure screw on the pressure arm can adjust the pressure and
match the punch of different sizes to make it more stable.
€¢ The products are well-made and ensure the high of the products.
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Max Demian