Apart from the K2, notice that T6 is less than T3, resulting in so-called
"dit shortening." Adding back the right amount of lead time to the RF
envelope through either hardware or software pulse-stretching is easy and
yet, few manufacturers "get" the concept. The amount stretching needed is
irrespective of CW speed; it's mostly a fixed value although often, the
duration of required pulse stretching is different between full and semi QSK
modes - but it doesn't need to be that way. For example, early Ten Tec's
(Omni VI and earlier), ran full QSK with receive recovery time being the
only variable that changed between the two QSK modes. Scope timing displays
appear identical, regardless of the QSK setting.
Paul, W9AC
----- Original Message -----
From: "Jim W7RY" <w7ry@centurytel.net>
To: "Vasiliy - K3IT" <gokoyev+k3it@gmail.com>; <amps@contesting.com>
Sent: Monday, February 11, 2013 8:44 PM
Subject: Re: [Amps] hot keying the amp?
Take a look here on how to measure QSK circuits and your radio:
http://www.w0qe.com/amplifier_timing.html
You need to measure the radio and the amplifier response. What radio are
you using? Have you measured the relay speed in the amplifier?
Email me privately if you wish to discuss further.
73
Jim W7RY
http://www.ebay.com/sch/radioamplifiers/m.html?item=281051269896&ssPageName=STRK%3AMESELX%3AIT&rt=nc&_trksid=p2047675.l2562
-----Original Message-----
From: Vasiliy - K3IT
Sent: Sunday, February 10, 2013 8:38 PM
To: amps@contesting.com
Subject: [Amps] hot keying the amp?
the new amp LK500ZB and I continue our bonding process :)
I've wired up the QSK circuit and recorded the CW signal on my scope. I
can see a small bump after each dot and dash, like on the picture here
http://goo.gl/74HO3
Does it look like hot keying the amp? There is also a very sharp fall
off
- the dot is supposed to be 87ms but cut off early. Is anybody familiar
with the QSK circuit on LZ500ZB and/or have words of wisdom? I wonder if
the QSK circuit has been played with and I can't operate it like this.
(I'm really knew to "QRO" stuff).
73
P.S. Thanks to all for answers regarding the LK500Z output on 10m. I've
been testing and re-testing and now consistently get good power on all
bands.
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