Hi Jeff -
I believe you. All our ears are so very different. I have experienced
what you have, there are times that my own ears and brain do a better
job of distinguishing the signal from the noise than the filters (in
some rigs) will. Have you ever profiled your hearing (the curves of
where you hear/where you don't?) I have, by a lot of trial and error,
found that my ears can distinguish signals from noise better at a
slightly lower frequency, so I've managed to get filters with lower
center frequencies (like the roofing filter I use and the Ten Tec (NS)
221 centered down at a 500 Hz note). On many rigs, I prefer to hear
wide open filters, on mine, with these filters and the PBT set just
right, I can get a few more db to my brain with the filters.
I also suffer fatigue from hearing the same frequency all the time and
often just tweak the CW note just a little and the difference perks me
up to hear a bit better ... every few minutes. I probably ought to use
diversity - I bet that is the hot ticket. Just haven't gotten around
to dual receivers and dual antennas here at the QTH yet, too busy with
my acoustic guitars and mandolins lately :-) .
Clark
WA3JPG
On Jun 16, 2007, at 6:19 AM, Jeff Frank wrote:
> I have an Omni 6 opt 1, which I like very much, but on weak cw
> signals, my experience with the filters seems counter-intuitive. I
> almost always have easier and clearer copy on weak cw signals when I
> use the 1.8 khz filter vs. the .5 or .25 khz filters in my 6.3 mhz IF.
> I've got nothing in the N1 position. Is this the way it's suppposed to
> be? I always thought narrowing the filter bandwidth is supposed to cut
> down on noise but it seems opposite. Has it got something to do with
> receivers that are optimized for adjacent signal rejection vs. signal
> to noise ratio? I think I read that somewhere. Can anyone explain this
> to me? Thanks.
>
Clark Savage Turner, J.D., Ph.D.
Professor of Computer Science
Cal Poly State University
San Luis Obispo, CA. 93407
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