If I understand the way the Omni VI works, signals
first go thru the roofing filter, then 9 MHz 2400 Hz, then
through the optional NAR 9 MHz filter before going
though the 6 MHz filters. This means you will see
about 13 dB additional insertion loss when the NAR
filter is selected,
But doesn' t the Omni6 + have a similar gain adjustment for high loss
filters as the Orion? That is, for the optional 9 MHz filter there is a jumper
plug that can be set to at least partially compensate for the higher losses
from
the 216,217 219 and ,yes, the 221 filters.
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