[Elecraft] [Was] Amp power per $$ spreadsheet download [Now] CW

[Phil Hystad]

Michael,

No problem — I guess I was just reading the messages at the time you posted yours or soon after.

Math, actually, Mathematical Physics is my number one passion and hobby (yes, I mean hobby).  Ham radio is important to me but it ranks 3rd behind second ranked woodworking (hand joinery projects) and first ranked mathematical physics (QED/QFT and General Relativity).

73, phil, K7PEH


> On Apr 27, 2015, at 5:01 PM, Michael Zolno <luv.myipad3 at me.com> wrote:
> 
> Well that was fast! Thank You Phil!
> 
> I'm not an engineer, or a mathematician, but on the recommendation of someone whom I respect (Phil Anderson, W0XI) during an email chat last year, I've been looking for a bit more of the "behind the scenes" math wise when something interests me.
> 
> My apologies for the OT bandwidth and Thank You.
> 
> All my very best,
> 
> Mike WH6YH 
> 
> Sent from my iPad
> 
>> On Apr 27, 2015, at 7:47 PM, Phil Hystad <phystad at mac.com> wrote:
>> 
>> I am not Jim but if you are asking for the math based reference for square waves…
>> 
>> http://en.wikipedia.org/wiki/Square_wave
>> 
>> 73, phil, K7PEH
>> 
>> 
>>> On Apr 27, 2015, at 4:42 PM, Michael Zolno <luv.myipad3 at me.com> wrote:
>>> 
>>> Jim,
>>> 
>>> Can you point to a math based reference for this. I am curious (really). Any other non math based is appreciated as well if not immediately available.
>>> 
>>> All my best,
>>> 
>>> Mike WH6YH 
>>> 
>>> Sent from my iPad
>>> 
>>>>> On Apr 27, 2015, at 7:51 AM, elecraft-request at mailman.qth.net wrote:
>>>>> 
>>>>> On Sun,4/26/2015 10:33 PM, Vic Rosenthal wrote:
>>>>> Sharpening the envelope is harmonic distortion, not IMD. I think.
>>>> 
>>>> Nope. It's a bunch of square waves, and any square wave is composed of 
>>>> an infinite series of harmonics. Those frequencies are present in the 
>>>> drive signal (from small signal circuits to power amp circuits, whether 
>>>> in the rig or in a power amp), and if either is non-linear, distortion 
>>>> is produced.
>>>> 
>>>> It's important to realize that ANY non-linear element produces both IMD 
>>>> and harmonics -- indeed, in-band IMD is the result of the mixing of 
>>>> harmonics in a non-linear circuit. Quantities like IMD and THD are 
>>>> simply different ways of quantifying the distortion produced by 
>>>> non-linear devices!
>>>> 
>>>> 73, Jim K9YC
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>>