The Orion filters are superb. PBT & BW controls behave exactly as
expected. High cut behaves exactly as expected and so does Low cut
However, in the case of Low cut, unlike the others, the representation
of what is going on is incorrect, as it is illustrated on the screen.
When adjusting Low cut it appears as if PBT is being adjusted,
suggesting a movement of the complete passband wrt carrier frequency.
The BW digital readout does appear to reflect what is really going on,
while there is a 2 x BW rate of change indicated on the PBT digital
readout. This is erroneous. There should be no PBT change at all with
this control. Additionally, there is a clean graphical illustration of
BW setting for the sub Rx but the primary Rx illustration is marred by a
spurious bar at its top.
These are niggles but I emphasise; they affect only the representation
of what is going on, as displayed on the Orion screen. They have no
effect at all, on actual operation of the Orion's superb filtering scheme.
Bob, 5B4AGN, P3F
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