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@gmail.com> wrote:
>
> In case you do that, you still need stubs after the amp.
> Amplifier creates harmonics out of the fundamental frequency.
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
|