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Here's the app note referenced in the QEX article. It is much better written and gives a clear explanation of the design considerations. More importantly it describes how to measure the large signal

Here's an Amazon list of candidates. These are not cheap, so I'd like to get things other people have read and like. NB I'm a paper book guy. Introduction to RF Power Amplifier Design and

The QEX article has highlighted the age of my references on the topic. I'd like to get some more recent monographs. Does anyone have books they think are particularly good? I am looking for things

I agree that the editor should make certain the articles are well written. But that's a lot of work for one person. We really need to have a pool of reviewers. Not sure how to make that happen. I

That explanation agrees with my thoughts, but editorship should insure that the articles are precise, concise and clearly written. I personally would pay more to have the “full” articles appear

I think that's the page limit for an issue at work. The larger problem is a paucity of writers, reviewers and most importantly advertisers. After my last post I noticed the equation for the load is

Many QEX articles seem to be … discontinuous … in their presentation. Often there is a note that directs the reader to the “full” article online. I’m not sure what to make of this. DaveD

I think that must be the case. The 2N3904 does not appear to be biased for class C operation. I'm going to construct the circuit and make some measurements. The biasing shown in figure 8 is also

Perhaps "bias at 20 mA" refers to the device collector current. This seems to be a common way to describe setting an amplifier's the bias point. KU4AF

[email protected]> wrote: Reg, I can’t comment on the article as I don’t subscribe to QEX. I used to, and have had a few things published in there, but I don’t any longer. I might reconsider

I decided I should construct the circuit in figure 8. So I made an enlarged copy to study more closely. At the top left it states "bias at 20 mA" next to R1 which is 180k. Unless I have completely

I'd like to clarify that I am not looking for help. My question is about the quality of the article. I'm a retired oil industry research scientist/programmer. I've written a couple hundred thousand

One really needs to read the article to understand what I'm getting at. If I didn't know how it worked I'd be very intimidated. I couldn't make any sense of it. It's available on line for ARRL

I don't have the QEX article, so feel free to take this as you will. The small-signal model indeed shows a sinusoidal input to the B-E junction with the 0.6V battery that Jim mentioned. At one

Hi, Jim, My confusion arose from the article showing the "input waveform" which I interpreted as the BE current and voltage, not the input to the amplifier. Once Vbe drops below ~0.6 V, Ibe drops to

Hi Reg, To understand that simulation, try looking at some of the transistor models that get used.? ? ? As perhaps you surmised, class C is about they output and not about the input.? ?But, you

Sigh... After posting that I realized my conception of class C is dominated by the output, not the input waveforms. Doesn't change the fact I can't figure out what he is trying to say. Reg

I'm curious what others think of this article. I have read it a few times and find it completely incomprehensible to the point I question the correctness. In particular, figures 9 and 13 are very

It's quite different from Diophantine equations which impose the constraint that only integer values are allowed. That would make no sense in the context of filter design. The advantage is optimal

I believe I had that in a course in Number Theory and as I recall it was called Diophantine equations. Regardless, crystal filters have been around long before linear programing or even ready to use