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[K3 and KX3] CW WGT observations and measurements

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Cady, Fred

[K3 and KX3] CW WGT observations and measurements

Hi all,
I normally keep the K3's CW WGT setting at 1.0 because I like the 3:1
Dah:Dit ratio and the 1:1 Dit:Space ratio. When I tried that with the
KX3 it sounded horrible to my ears - very choppy. So I set up to measure
the Dit, Dah and Space times with an oscilloscope. I can transmit into a
dummy load and measure the times easily. The data below is in
milliseconds for CW at 20 WPM.

You can see a better representation of these data in a graph at
https://sites.google.com/a/ke7x.com/www/home/miscellaneous-k3-informatio
n/k3-and-kx3-cw-wgt.

Looking at the data and the graph I can see that for the best match for
3:1 and 1:1 I should set the K3 WGT to 1.05 and the KX3's to 1.15.

K3
K3 Wgt 0.9 1 1.05 1.15 1.25
Dit 49 54 56 64 69
Dah 162 166 171 177 183
Space 64 60 55 50 46
Dah/dit 3.3 3.1 3.1 2.8 2.7
Dit/space 0.8 0.9 1.0 1.3 1.5
KX3
KX3 Wgt 1 1.05 1.15 1.25
Dit 50 52 58 64
Dah 165 166 171 178
Space 66 64 59 52
Dah/dit 3.3 3.2 2.9 2.8
Dit/space 0.8 0.8 1.0 1.2

Cheers and 73,
Fred KE7X

Fred Cady
"The Elecraft K3: Design, Configuration and Operation"
www.ke7x.com

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Cady, Fred

Re: [K3 and KX3] CW WGT observations and measurements

Rats. The url below got truncated. Just go to www.ke7x.com and click on
K3 and KX3 CW WGT
Cheers,
X

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Cady, Fred
Sent: Friday, November 09, 2012 6:03 PM
To: [hidden email]
Subject: [Elecraft] [K3 and KX3] CW WGT observations and measurements

Hi all,
I normally keep the K3's CW WGT setting at 1.0 because I like the 3:1
Dah:Dit ratio and the 1:1 Dit:Space ratio. When I tried that with the
KX3 it sounded horrible to my ears - very choppy. So I set up to measure
the Dit, Dah and Space times with an oscilloscope. I can transmit into a
dummy load and measure the times easily. The data below is in
milliseconds for CW at 20 WPM.

You can see a better representation of these data in a graph at
https://sites.google.com/a/ke7x.com/www/home/miscellaneous-k3-informatio
n/k3-and-kx3-cw-wgt.

Looking at the data and the graph I can see that for the best match for
3:1 and 1:1 I should set the K3 WGT to 1.05 and the KX3's to 1.15.

K3
K3 Wgt 0.9 1 1.05 1.15 1.25
Dit 49 54 56 64 69
Dah 162 166 171 177 183
Space 64 60 55 50 46
Dah/dit 3.3 3.1 3.1 2.8 2.7
Dit/space 0.8 0.9 1.0 1.3 1.5
KX3
KX3 Wgt 1 1.05 1.15 1.25
Dit 50 52 58 64
Dah 165 166 171 178
Space 66 64 59 52
Dah/dit 3.3 3.2 2.9 2.8
Dit/space 0.8 0.8 1.0 1.2

Cheers and 73,
Fred KE7X

Fred Cady
"The Elecraft K3: Design, Configuration and Operation"
www.ke7x.com

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John Oppenheimer

Re: [K3 and KX3] CW WGT observations and measurements

In reply to this post by Cady, Fred

Hi Fred,

The Weight control adds the same time extension to both Dit and Dah,
therefore, as the weight changes, so will the Dit to Dah ratio.

I also find that the KX3 keyer does not have a Weight of 1 when set to
1.00, it's close to 0.80. The Weight control needs to be set to 1.20 to
have a sending weight of one.

Supporting scope shots are here:
http://www.kn5l.net/KX3/kx3-weight.html

John KN5L
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Heinz Baertschi

Re: [K3 and KX3] CW WGT observations and measurements

John Oppenheimer wrote

Hi Fred,
...
I also find that the KX3 keyer does not have a Weight of 1 when set to
1.00, it's close to 0.80. The Weight control needs to be set to 1.20 to
have a sending weight of one.

Supporting scope shots are here:
http://www.kn5l.net/KX3/kx3-weight.html

John KN5L

Hi John et al.,

After the modified KXPD3 could be adjusted nearly perfect for my needs I would very appreciate if Elecraft could improve the timing of the KX3 keyer (either by correction or by extending the weighting range).

73, Heinz HB9BCB