I have a new-to-me Omni VI+. I have a question concerning pass band tuning and
the filters.
My Omni VI+ has these filters:
9MHZ
(48058) 9429 8-pole -2.4 khz
N1
(48058) 9918 8-pole -2.4 hz
N2
219 (48055) 6-pole -250 hz
6.3 MHZ
282 (49054) 6-pole -250 hz-
285 (48053) 6-pole -500 hz-
288 (48075) 8-pole -1.8 khz-
Standard - 2.4 khz
I view my audio output using Spectrogram (wonderful for zero beating for those
of us with
a tin ear). Using Spectrogram you can see the range of audio frequencies being
sent to
the headphones and speaker.
When I turn the PBT knob, I can see the passband shift up or down for each
filter except
the 219 (48055) 6-pole -250 hz in position N2. That filter doesn't move.
If the knob on the PBT is centered it shows passing a narrow band of
frequencies (although
not as cleanly as the other filters). If I turn the knob fully CCW there is no
change in
the frequencies or width. If I turn the knob CW, the audio fades and
disappears as The
knob is turned.
Is this normal? The filter in the N1 position behaves as expected.
73 de K1ESE
John
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