[time-nuts] Injection locking

[Bob Camp]

Hi

If you want to start with sine waves rather than square waves, there is a
lot of data on duty cycle and harmonics. Often you find it with stuff in the
title like "clipped cosine wave". 

Just about any RF design text book from the 1940's or 1950's probably will
have some nice charts in it. Fiddling bias on class C triode amplifiers used
to be a major part of the design. 

No, I will not under any circumstances reveal which course I learned that in
and how long ago it was....

Of course a simple Excel spread sheet can come up with all of this pretty
fast.  

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Didier Juges
Sent: Thursday, February 11, 2010 10:42 AM
To: Time-Nuts
Subject: Re: [time-nuts] Injection locking

This link will show you the effect of duty cycle on harmonic content:

http://www.ko4bb.com/Test_Equipment/Pulse_Modulation/

Didier KO4BB

------------------------ Sent from my BlackBerry Wireless thingy while I do
other things... 

-----Original Message-----
From: Rex <rexa at sonic.net>
Date: Thu, 11 Feb 2010 02:09:48 
To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
Subject: Re: [time-nuts] Injection locking

Kit Scally wrote:
> ...
>
> On a related topic, I found some while ago - and promptly lost - a
> graph/chart showing harmonic level variations with varying duty-cycle of
> an input waveform.  This was to some degree a graphical representation
> of the Wenzel document referenced by Bruce recently.  Has anyone got a
> link to this document please ?
>
>
> Kit
> VK2LL 
>
>   

Is this the Wenzel document you are referring to?
http://www.wenzel.com/pdffiles1/pdfs/choose.pdf  ("Choosing a Frequency 
Multiplier's Waveform")

Figure 2 in that doc is a graph of Harmonic Amplitudes vs. pulse width. 
Is that what you were looking for? There are a couple of bar charts too, 
for specific duty cycles.




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