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  • CQ Amateur Radio

    ANALOG ADVENTURES

    Apr 01, 2020 4 minutes
    BY ERIC P. NICHOLS,* KL7AJ

    One of the problems of a column being only bi-monthly is that you can lose your train of thought between installments. Well, that’s not quite true, as I write my articles several months ahead in one coherent blast. But a couple of astute readers have reminded me that I need to return to an earlier-promised topic, namely, the lock-in amplifier, and I shall do that now.

    If you like working with very weak signals, there’s nothing that can quite beat the performance of the classic lock-in amplifier … that is, if you have a lot of time to spare. There are certainly weak-signal communications modes and devices, but when it comes to pulling a basically beat the absolute weak-signal performance of the lock-in amplifier.

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