[Elecraft] [K3] Tokyo Hy-Power HL-1.2KFX amp interfacing (to ALC or not to ALC?)

[Eric Swartz - WA6HHQ, Elecraft]

Let's end this thread at this time in the interest of relieving other readers 
from overload.

If you feel compelled to continue the CW b/w discussion, please take it to 
private email.

73,

Eric
/elecraft.com/

On 3/30/2016 8:18 AM, Guy Olinger K2AV wrote:
> One could discourse all day on what "proper" is in this context without
> ever a precise consensus among educated gentlemen. At some point of "ugly"
> we would all agree that anything that sounds like that is improper.
>
> When the only stateful levels were strictly on and off, and the rise and
> fall transition time amplitude curves were set by a resistor and a
> capacitor, one could make some simplifications in the discussion.
>
> Today, often, as in the K3, the rise and fall times and shapes of CW are
> DATA which goes DIRECTLY to RF via a DAC. For these the nature of the rise
> and fall curve is not governed by a charge/discharge time of analog
> components, but rather by whatever function generated the waveshape data,
> which is stored, *read* as needed and never generated real time. In many
> cases it is far more accurate to say that the rise and fall of a baud is
> INTRODUCED, rather than the signal is keyed.
>
> If the rise and fall data curves used for "keying" vary their "sharpness"
> according to speed, then the description bandwidth increases by speed
> certainly does apply. But if not, the bandwidth is governed by the pulse
> generated by the rise and fall data, which could be the exact same from 1
> wpm to 40 wpm.
>
> We are so easily diverted into our lifelong, unconscious, and utterly
> habitual analog thinking (note that I certainly do not give myself a free
> pass here).
>
> I was just looking at the P3 display of some traditional BC band stations
> around here. A 30 over 9 station at 1490 kHz fills up 1480 to 1500. Using
> the K3's AM-S mode on USB side the S9 station at 1500 kHz is clearly
> intelligible, but the standard demodulation for 1500 is obliterated by the
> 1490 station. That ain't your granddaddy's AM out there any more. That's
> some really complicated stuff that completely fills up +/- 10 kHz and
> clearly not done the same from station to station. I'm going to save
> googling that for a free evening when I don't have something broken to fix.
>
> There is so much stuff I was taught by my WCTT Chief Engineer Elmer that I
> am having to set aside.
>
>
> 73, Guy K2AV
>
>
> On Wed, Mar 30, 2016 at 8:28 AM, Joe Subich, W4TV <lists at subich.com> wrote:
>
>> On 3/30/2016 12:21 AM, Jim Brown wrote:
>>> Unfortunately the guys who wrote the rules failed to understand the
>>> physics and the math.
>> No Jim, you are wrong here. CW is a carrier modulated by a digital
>> (on/off keyed) signal of a given (baud) rate.  That keying will
>> generate sidebands +/- the baud rate *just like FSK* or even AM which
>> can be observed on a spectrum analyzer.  The ITU formula is quite
>> accurate in terms of the actual bandwidth for signals with *properly*
>> *shaped keying*.
>>
>> Again, the excess bandwidth from improperly shaped keying signals
>> (clicks) and/or amplifier distortion is something else.
>>
>> 73,
>>
>>     ... Joe, W4TV
>>
>>
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