Paul,
I have installed the two 400Hz Inrad filters (#750/#759), in
addition to the 600Hz roofing filter (#763) and board. I can tell
you from my perspective, after replacing the TT 2x500 and 2x250
filters, that the choice was worth the expense. My primary usage is
CW DX'ing for the weak ones, in crowded and noisy conditions.
The 400Hz filters are razor sharp, very low ringing, and seem to
enhance the signal by diminishing the noise power in the passband.
I seldom the TT NR-DSP because of the distracting artifacts, but it
REALLY is more useful with the Inrad filters - I think due to less
noise to process. And, as Clark mentioned, when you switch in the
roofing filter, the adjacent QRM disappears.
The TT 250Hz filters drove me crazy with the hollow-ringing and
constant 'chasing' a weak signal around the passband. The 500Hz TT
filters were just the right width, but the shape factor always
seemed too large. I never had extra TT filters to swap around to
discover if there was anything unusual about the pairs I owned.
After using the Inrad 400Hz filters, I bit the bullet and purchased
one of the #766 1,000Hz filters for the N2 position. I wanted a
'wide' window for sleuthing around the band, and it is an absolute
delight. I just wish that Inrad would produce the compliment 6.3mHz
1,000Hz filter. I have been advised that if they receive enough
orders, they will market one. For now, I continue to use the 1.8kHz
TT filter.
73 Bill N4LG
At 11:52 AM 6/14/2007, you wrote:
I only see a couple of entries in the eHam reviews for the Inrad
roofing
filters for the Omni VI. I'm considering getting the CW version
and would
appreciate any comments on the performance enhancement that these
filters provide.
Thanks,
Paul, K5AF
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Bill Cotter, N4LG E-mail: n4alg@qx.net
173 Carolyn Lane Home: (859) 887-5563
Nicholasville, KY 40356-9340 Work: (859) 323-6474
ARRL ARCI #9878 QRPl #1646 QCWA #29393 FISTS #4535
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