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

[Joe Subich, W4TV]

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


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. They were WRONG, and it is a misconception under
> which we have been laboring for as long as I've been a ham. It was Henry
> Ott who woke me up to this when I took his 3-day class on EMC around
> 2003-4. Henry is a VERY smart guy, one of many who came out of Bell Labs.
>
> 73, Jim K9YC
>
> On Tue,3/29/2016 1:28 PM, Joe Subich, W4TV wrote:
>> >> On 3/29/2016 10:38 AM, Jim Brown wrote:
>>>>> WRONG! CW speed has NOTHING to do with bandwidth, which is
>>>>> determined by RISE and FALL times of the keying waveform and
>>>>> distortion in the RF stages.
>>
>> The standard word "paris" has 48 elements.  That makes the baud rate
>> for CW (48/60) x WPM or 0.80 x WPM.
>>
>> ITU defines the "Necessary Bandwidth" for CW as 3 or 5 times the speed
>> in bits per second (baud rate) where 3 x is for "non fading circuits"
>> (where the waveform does not need to be so "sharp") and 5 x for "fading
>> circuits."    See:
>>     http://http://life.itu.ch/radioclub/rr/ap01.htm part B.
>> The same table is found in Title 97, Part 2 of the Code of Federal
>> Regulations (FCC Rules) as §2.202(g)
>>
>> The constant 'K' sets the minimum bandwidth needed/occupied for the two
>> recognized cases.  Occupied bandwidth in excess of K=5 (or 400 Hz for
>> 100 WPM) would be unacceptable due to improper keying waveforms or
>> distortion in the RF stages.
>>
>> 73,
>>
>>   ... Joe, W4TV
>>
>>
>
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