[CW] Re: Numbers stations

[Robert Carroll]

Getting cw signals through better at lower speeds is certainly true in most
situations.  Some of the low bands can be exceptions at times--particularly
160m.  In high noise/QRM/signal-near-the-noise-floor conditions on 160m, you
will often hear ops trying to get their call through to the DX which can't
quite copy it at say 20 wpm, by reducing speed, maybe to 10 wpm.  Under some
conditions of QSB and lightning crashes, though, this just doesn't work.
When a symbol stretches out through a crash, you simply can't discern the
elements in it.  In that case some ops crank up the speed to get the call
through--or a missing letter through--before the next crash.  These days
there are some improved cw decoders out there (in my opinion cwget is still
the best if you know how to adjust the threshold), but so far I have seen no
cw decoders which do a decent job under noisy conditions on 160m with
signals near the noise floor.

73
Bob W2WG

-----Original Message-----
From: cw-bounces at mailman.qth.net [mailto:cw-bounces at mailman.qth.net] On
Behalf Of Mike Andrews W5EGO
Sent: Thursday, September 11, 2008 3:01 PM
To: CW Reflector
Subject: Re: [CW] Re: Numbers stations

On Thu, Sep 11, 2008 at 02:52:09PM -0400, George Allgood wrote:
> Hi Ron,
> 
> Please explain how lower morse code speeds are more noise immune than
higher
> speeds?
> That's a new one for me!
> Thanks

Lower speeds mean that you (or the computer) have more time per element
to decide is it's
(a)	noise
(b)	a dit
(c)	a dah
(d) some other non-noise thing

-- 
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin 
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