Hi Gordon;
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Yes - a tuned circuit at the emitter bypass of Q3. LTSpice simulation suggested replacing C22 with 150 pF and R33 with a 100 nH chip inductor. This combination does appear to work, with a further reduction in spurs, along with slightly more drive as a bonus.
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I also started using ChatGPT to examine various inductor & capacitor combinations. It's so much simpler and quicker to ask ChatGPT to find the resonant frequency of an LC circuit, or to determine the capacitor value required to make a given inductor value resonate at a specific frequency. It will even offer to generate Spice simulation files, or Python code to simulate the result.?
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Farhan was probably the first to use AI for SBitx work - he created some of the user interface code with the help of AI.
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73; Steve, N3SB
