N6KB wrote:
"I understand why someone with a non plus or version 3 upgraded Omni VI would
want the Inrad modification, in order to get another narrow 1st IF filter
option."
The "non plus" Omni VI has only one NAR filter switch, which can be either on
or off, so options are limited. I have my Inrad roofing filter hooked up so
that it is switched in along with my downstream 9 MHz IF filter, when the NAR
switch is engaged. The only way to gain another option would be to keep the
NAR switch hooked up as-is (which is tempting as there is little slack in the
cable), and hard-wiring the relay on the roofing filter to V+, so that it is
engaged as soon as the rig is turned on. The disadvantage of doing it this way
would be that your mode options would be limited by the bandwidth of the new
roofing filter.
With the VI+, or Opt. 3, two NAR switches are available (one additional bit of
information), so there are four possible switch combinations to provide
filtering "options."
73,
Chuck NI0C
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