Barry N1EU said:
>>Correct me if I'm wrong, but Bill is ordering filters
with a center frequency of 9.001500, which isn't what
the Omni VI is looking for.
Correctomundo, Barry! But, 9.001500 isn't correct for
the Orion, either. The 9.001500 "standard" for
wider TenTec filters is derived from the idea of
0-300 stop band
300-2700 pass band (i.e., 2400Hz bandwidth)
2700-3000 stop band
and the symmetry of switching sidebands by moving
the BFO frequency 3 kHz. If you get a center frequency
of 9.001500 with a narrow bandwidth, 400, 500 or 600 HZ,
you are assuming you want a CW tone of 1500Hz with
a BFO of 9 MHz. The correct center frequency for
the narrow filter is 9.000750, which results in a
default CW pitch of 750 Hz, +/- the adjustment.
In summary, I believe a better choice for a special
order frequency is 9.000750, which would accomdate
both Orion and OMNI VI users.
Thanks for pointing out the offset problem.
Terry ZIvney, N4TZ/9
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