Since the input ?impedance response and bandpass properties of the Tayloe circuit change and slide along with the clock frequency, the self-test BPF plots we make with these radios are somewhat illusory. Each data point on the plot is real and valid as it is taken, but the overall network changes a bit as we change the clock frequency. If we are listening at 14 MHz and hoping to see signals at 9 MHz rejected in accordance with the measurement we made at 9 MHz, that expectation is probably wrong. The network that existed as the 9 MHz measurement was made no longer exists when we listen at 12 MHz. How big is the difference between the plot and reality? Are we better or worse off than what the plot suggests? Does it really matter? That is hard to say.?
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On Sep 26, 2023, at 4:58 PM, Ryuji Suzuki AB1WX <
ab1wx@...> wrote:
Indeed. However, I hope you now see that the complexity from the TX LPF side is much worse!
