It's worth a try, but I must admit that the only
time I've had success with filtering, I was able
to hear "some" code in the raw file, and the
filtering cleaned it up further. Because the
CKMO code is so fast, it might be difficult to
see it in a waterfall display, which is another
method of being able to detect the code. I'm
not an expert on this, so others may have some
suggestions on digging it out from an otherwise inaudible situation.
Nick
At 20:43 04-03-12, you wrote:
So the CW is 700 Hz, you say?
When I recorded the video last night (link in a
prev msg) of my reception on 900, I don't recall
ever hearing any trace of CW. XEW was on top,
and there was considerable splatter from 910-KECR.
I hope to try again tonight, though, and I was
thinking.... Does anyone think I have a chance
if I record it, then import the audio in an
editor and use a very narrow bandpass filter
around 700 Hz (for example ±15-20 Hz @ -3 dB,
25-100 Hz @ -60-90 dB depending on how good
Audacity's custom equalizer works), I might have
a chance to pick out some CW? With the unedited
audio straight from the radio, I can't detect
any trace of CW in the previous recording, even
though I have a sharp ear that can detect
slightly out of tune notes on a piano that 99%
of people would think are fine, for example.
------------------------------
On Sun, Mar 4, 2012 9:44 AM PST Nick Hall-Patch wrote:
>The CW ID seems to be at the end of a canned verbal ID by a man
>mentioning call letters, Camosun College and ending with "we are
>Village 900" The CW pitch seems to be a few Hertz below 700Hz for
>those who might want to try some filtering on an otherwise blocked
>channel. I've heard the ID on the hour as well (not before BBC
>news?) as well as after the news, but it seems to be popping up at
>other times also. Oh yes, the CW ID is pretty swift also, at least
>to my aged ears, and goes on for over 10 seconds.
>
>Good luck with catching this. It's effectively a several day long
>DX test, with no hope of a repeat, so best to log them now.
>
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