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  • CQ Amateur Radio

    ANALOG ADVENTURES

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

    HOW I DO IT

    Coffee, coffee in my veins
    Stimulate this writer’s brains
    Course right through my every artery
    Make my verse more terse and smartery
    By the teacup, by the mug,
    Inspiration by the jug
    Word and page, there’s aught between us,
    Time for caffeine intravenous
    Is it madness? Do I sorta
    Feel a throb in my aorta?
    No, it’s nothing, just a twinge
    Time to start another binge

    – Eric P. Nichols, KL7AJ, 2004

    As promised, we will explore the Gilbert Cell, or “four quadrant multiplier,” in this exciting episode of Analog Adventures. The Gilbert Cell is quite similar in function to the double balanced mixer (DBM) described in previous, the transformers on the RF (radio frequency) and LO (local oscillator) ports have lower frequency limits. These can, likewise, put a lower frequency limit on receivers that rely on the DBM. If you’re interested in exploring our lowest-frequency ham band, 2200 meters, you will probably want to investigate the Gilbert Cell.

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