[CQ-Contest] Coax Stubs for SO2R

[Jeff AC0C]

The only amplifier that does not generate harmonic content is the 
theoretically ideal types - nothing in the real world is perfect meaning 
they all generate their own levels of harmonic content.

Now it's fair to argue to what level those harmonics are present and the 
impact/mitigation, but that's a much more real-world subject than "amps do 
not generate harmonics."

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: Rudy Bakalov via CQ-Contest
Sent: Monday, July 25, 2016 6:48 PM
To: Jukka Klemola ; cq-contest at contesting.com
Subject: Re: [CQ-Contest] Coax Stubs for SO2R

Jukka,

It is the statement below that really puzzles me. All amp people I know, 
including those that manufacture commercial amps, categorically state that 
amps do not generate harmonics on their own. That is, amps merely amplify 
them.

To me this seemingly minor difference is huge. If amps only amplify but do 
not generate harmonics then there is no scientific reason for filtering 
after the amp assuming the same amount of filtering is applied before the 
amp. In practical terms, this would mean that low power BPFs before the amp 
are as effective as high power BPFs after the amp.

The key point here is GENERATE vs AMPLIFY harmonics. Can the average 
commercial, well stabilized amp generate harmonics?

Rudy N2WQ

Sent using a tiny keyboard.  Please excuse brevity, typos, or inappropriate 
autocorrect.


> On Jul 24, 2016, at 5:14 PM, Jukka Klemola <jpklemola at gmail.com> wrote:
>
> In case you do that, you still need stubs after the amp.
> Amplifier creates harmonics out of the fundamental frequency.

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