[TenTec] CW keying weight

[Carl Moreschi]

Mark,

The CW weight adjustment is to make up for slow keying characteristics
of a particular transceiver.  What you are striving for is the end result
coming out of the transceiver is a perfect 3 to 1 ratio of dit to dah
length.
Some transceivers will chop off part of each character, especially at the
higher speeds.  The weighting is then adjusted to restore the 3 to 1 ratio
on the output signal.

Carl Moreschi N4PY

----- Original Message -----
From: "Mark Erbaugh" <mark@microenh.com>
To: <tentec@contesting.com>
Sent: Wednesday, January 16, 2002 8:07 AM
Subject: [TenTec] CW keying weight


> This is for the serious CW ops out there.
>
> I'm working on a rig control program for the Pegasus. The Pegasus lets you
> adjust the length of the dits, dahs and element spaces independently. I
have
> figured out the formula for calculating the timing of CW dits, dahs and
> spaces from WPM when using standard weighting (dah = 3 * dit = 3 * space).
> Is there an accepted standard on how to apply weighting? My assumption
would
> be that normal weight would be 100%, a weight of 80% would mean that dah =
3
> * dit * 0.80, a weight of 120% would mean dah = 3 * dit * 1.2. Is this
what
> people would expect of CW weight? What's an acceptable range of weight
> adjustment. Obviously an absolute minimum would be 33% when dahs would
have
> the same length as dits.
>
> When the weight is not 100%, how does one calculate the WPM? Is it based
on
> the length of the dit or the dah or perhaps based on the recalculated
length
> of some standard 'word' such as PARIS?
>
> When the weight is not 100%, is the length of the element space still the
> same as the length of a dit or is it 1/3 the length of the dah? Or is it
> something else, like the normal length of a dit at the adjusted WPM
> calculated above?
>
> Why do operators adjust the keyeing weight? Is it just for a
characteristic
> sound or does is improve the readability under certain conditions? If so,
> what adjustment is used under what conditions?
>
>
> Thanks and 73,
> Mark
>
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