Hi Jason,
But to answer your question as to why I do not have any filters in the NAR
slot it is primarily because every filter i've put in there has had more
than 2 S-units of signal attenuation - I don't want any attenuation at all
- I do want a narrow filter but not at the expense of a weak station
disappearing.
My Omni VI (not plus or version 3) has the Ten-Tec 217 500 Hz BW filter
in the 9 MHz IF NAR optional filter position. I do not notice any
attenuation on signals inside this bandwidth when I switch the narrow
filter in. There may be some net measurable loss, which I have never
measured. There is certainly not 12 dB (two S units) or even 3 dB (one
half S unit) as I am sure I could discern that amount of loss with just
the S meter reading on a steady carrier. That makes me wonder if there
was something wrong with the filters you tried, or the circuitry or
jumpering on your 9MHz Mixer/IF Board.
Anyway if the Inrad mod is giving you what you want, that is great. I
will be looking in to that modification myself, as I do understand the
advantage of having the narrow bandwidth filter earlier in the signal chain.
DE N6KB
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