On Fri,12/23/2016 10:11 AM, Alan Bloom wrote:
You could always compensate for it by adjusting the K3 for softer key
shaping.
Wayne carefully shaped the keying waveform to minimize occupied
bandwidth while maintaining good clarity at high keying speeds, and he
purposely did not allow users to
Yes was thinking it was something new.
Thank´s Alan
73 merry xmas / Jim SM2EKM
On 2016-12-24 06:23, Alan Bloom wrote:
Apparently you can't. I must have been thinking of the weight adjustment.
Alan N1AL
On 12/23/2016 09:22 PM, Jan Erik Holm wrote:
On
Apparently you can't. I must have been thinking of the weight adjustment.
Alan N1AL
On 12/23/2016 09:22 PM, Jan Erik Holm wrote:
On 2016-12-23 19:11, Alan Bloom wrote:
You could always compensate for it by adjusting the K3 for softer
key shaping.
Alan N1AL
How do you do that ?
/ 73 Jim
On 2016-12-23 19:11, Alan Bloom wrote:
You could always compensate for it by adjusting the K3 for softer
key shaping.
Alan N1AL
How do you do that ?
/ 73 Jim
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Subject: Re: [Elecraft] IMD and CW
This has drifted fairly far from the original. Thus encouraged ...
I wondered about that and being retired I pursued it, ultimately with the
tech folks [well, one folk] at WWV who repeatedly assured me that they were
on-frequency and that their time informat
This has drifted fairly far from the original. Thus encouraged ...
I wondered about that and being retired I pursued it, ultimately with
the tech folks [well, one folk] at WWV who repeatedly assured me that
they were on-frequency and that their time information was correct which
of course was
I believe the K3/K3S use a raised sinusoid key shaping. It is a good
compromise to reduce the bandwidth without excessive ringing/backwave.
In the bad old days, CW key shaping was typically a simple R-C filter on
the key line. That resulted in an exponential rise and fall, which
resulted in
er
audio (baseband) power required, but it is not as linear either.
73, Ron AC7AC
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of K9MA
Sent: Friday, December 23, 2016 2:39 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] IMD and CW
Very interesti
Google "ampliphase" ... OKA: "The Transmitter all broadcast engineers
hate." All linear phase modulation until AM magically squirts out the top.
Factoid: When WWV was brand new, it transmitted farm reports for the
Agriculture Department ... using Morse code. I'm guessing the number of
farme
Very interesting, Fred. It makes sense, though, that plate modulated
class-C amplifiers aren't terribly linear. On the other hand, that kind
of distortion probably doesn't affect WWV's mission.
I wonder if the AM broadcast industry achieves lower distortion.
Feedback comes to mind.
73,
Sc
Not CW, and this probably won't work in 4X-land, but if you want to see
the difference a Class-C amp makes, set your P3 span to about 6 KHz, and
tune in WWV on its various frequencies. During the tone-on minutes, the
2.5 and 20 MHz signals will look as you expect an AM signal with a tone
modul
On 12/23/2016 12:11, Alan Bloom wrote:
For a CW signal, the nonlinearity of a typical power amplifier should
have the effect of shortening the rise and fall times. That does
indeed widen the transmitted bandwidth. But intuitively, it seems
like the distortion would have to be really bad to sh
For a CW signal, the nonlinearity of a typical power amplifier should
have the effect of shortening the rise and fall times. That does indeed
widen the transmitted bandwidth. But intuitively, it seems like the
distortion would have to be really bad to shorten the rise/fall times by
much. You
I didn't exactly do this, but I did investigate the effects of distortion on CW
signals. I disconnected my P3 from the K3 and set the IF to 7 MHz. so it would
act like a standalone spectrum analyzer.
I was interested in whether a class-C amplifier I had built would sharpen the
keying enough to
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