K3: New/ Old QSK

[Barry Simpson]

What is new/ old QSK ?  I cannot find such a menu/ config setting.

 

Barry Simpson  VK2BJ

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[Vic K2VCO]

Barry Simpson wrote:
> What is new/ old QSK ?  I cannot find such a menu/ config setting.

Hi Barry,

Go to CONFIG and select CW WEIGHT. Then press the "3" key on the numeric keypad to toggle it.

It doesn't seem to make much of a difference for me.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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[Dick Dievendorff]

See the K3 owner’s manual revision D-1, page 53, under the “CW WGHT” topic.    

 

“Tap 3 to select OLD or NEW QSK (default). NEW QSK reduces keying artifacts in the presence of QRN or QRM. OLD mutes/unmutes slightly faster.”

 

Dick, K6KR

 

 

From: [hidden email] [mailto:[hidden email]] On Behalf Of Barry Simpson
Sent: Saturday, December 06, 2008 1:15 PM
To: [hidden email]
Subject: [Elecraft] K3: New/ Old QSK

 

What is new/ old QSK ?  I cannot find such a menu/ config setting.

 

Barry Simpson  VK2BJ

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[P.B. Christensen]

> Go to CONFIG and select CW WEIGHT. Then press the "3" key on the numeric
> keypad to toggle it.
> It doesn't seem to make much of a difference for me.
> 73,
> Vic, K2VCO

Using the most current K3 F/W, I compared the New versus Old QSK
configuration using a dual-trace scope and an external keyer modified with a
buffered output for scope triggering.

Under the "Old" QSK setting, the CW envelope rises ~ 15 ms after contact
closure versus ~ 19 ms for "New."  Under "Old," the keyed RF envelope more
closely matches the external contact closure duration.

Listening in the headphones, I detect little difference in weighting and T/R
recovery time.  I haven't had time to compare the two modes under varying
AGC and band conditions, but unless I detect some anomaly, I am leaving my
K3 set for "Old. QSK."

Paul, W9AC

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[P.B. Christensen]

> Listening in the headphones, I detect little difference in weighting and
> T/R recovery time.

I made that comparison while listening to the side-tone.  When listening to
my K3'd off air CW signal on another receiver, the weighting difference
between New QSK and Old is certainly perceptible.

Paul, W9AC



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[Barry Simpson]

I agree that the weighting is too light with the New QSK enabled.

Barry Simpson  VK2BJ


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[Gary, W7TEA]

Paul, how does this compare with using Semi QSK with .01 delay.  It sounds
very similar to me--by ear--but I do not have the equipment to look at the issues
you've investigated.

Thank you, Gary W7TEA

P.B. Christensen wrote

> Listening in the headphones, I detect little difference in weighting and
> T/R recovery time.

I made that comparison while listening to the side-tone.  When listening to
my K3'd off air CW signal on another receiver, the weighting difference
between New QSK and Old is certainly perceptible.

Paul, W9AC



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[P.B. Christensen]

> Paul, how does this compare with using Semi QSK with .01 delay.  It sounds
> very similar to me--by ear--but I do not have the equipment to look at the
> issues> you've investigated. Thank you, Gary W7TEA

FYI - The New/Old selection also applies to the external key line.
Regardless of the delay setting, the CW transmit waveform does not change
between QSK and Semi-QSK.  The Semi-QSK waveform still follows the Old/New
selction as it does for full QSK.

To my ears, receive recovery time under Semi-QSK at 0.01 is still noticeably
longer than under full QSK in either New or Old modes.  Also, in QSK, I
don't detect any receiver recovery time difference between New/Old.

The only difference I've noticed so far is that keyed weighting is lighter
under New by 4 ms, and at the moment of key closure, the RF envelope time
starts at about 19ms versus 15 ms under Old.  The 4 ms difference is exactly
the delta of the RF envelope duration between New and Old modes.  So far,
I've not heard any anomaly that would cause me to switch from the Old to the
New mode.

In a nutshell, I much prefer the Old mode and hope it does not go away in a
future F/W release.

Paul, W9AC

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