On Sun, Feb 9, 2025 at 01:26 PM, Nils wrote:
a while ago there was a discussion in a german forum where forum member ArnoR proposed modifications to the original LZ1AQ circuit.
The modifications seemed plausible to me but as an electronic hobbyist with little knowledge (but a lot of passion!) I had difficulties understanding them.
A circuit (and later an updated version) was presented as an improvement over the original LZ1AQ design that i know has been in use for years (and has highly regarded updated versions published in this forum).?
Hi all,
i went through this german "mikrocontroller forum" thread from August 2021, where the threadopener ArnoR claimes, that the LZ1AQ circuit is "much too bad" and proposes a long list of modifications to improve the - in his view - flawed design. (See Nils' opening message of this topic).
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ArnoR seems to be quite experienced in discrete transistor circuit design, but not explicitly experienced in RF. The? language he uses during the forum discussion reads, even by german cultural language standards, annoyingly rude and self absorbed. He expects to be encouraged in his views and opinions and seems not really interested in advise or a true discussion of technical facts others than his. The moment of truth comes in post 15.08.2021 18:13:
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The poster "Heiner" is asking the question: "Are your ‘optimisations’ of the LZ1AQ circuit merely based on simulations, or measured in comparison and compared in real in practice under identical conditions?"
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ArnoR's response: "These are simulations, just like LZ1AQ, whose data also originate only from simulations. And two circuits,? simulated under the same conditions are comparable, even if the models are not 100% correct.......The circuit simulator is an excellent tool for designing such things. Due to the lack of measurement equipment, however, I can only judge subjectively."
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Let me conclude: The design flaws alleged by ArnoR with respect to the very early circuit diagram published by LZ1AQ, are solely based on his assumptions and simulations. He insinuates that LZ1AQ's experiences are also based on simulations only. ArnoR has obviously neither built nor tested or compared the amplifiers, nor had he the basic RF-test equipment available to do this, respectively big skills in RF-testing or practical dx-ing!?
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It seems, ArnoR's remarks have remained an unvalidated theoretical exercise, I have not yet found any information that his proposed amplifier circuit was built or tested by anyone later.?
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regards, fred
