KB6NU's Ham Radio Blog

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Two-part series covers receiver basics

Posted: 02 Apr 2016 11:54 AM PDT
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Microwaves&RF, an electronics engineering trade magazine is running a
two-part series on receiver basics. Part 1 discusses noise figure,
direct-conversion receivers, and single-conversion superheterodyne
receivers.

Part 2 covers dual-conversion superheterodyne receivers and direct RF
sampling receivers (shown below). Theres also a short discussion of the
performance characteristics of each type of receiver.
Block diagram of a direct RF-sampling receiver. This is the type of
receiver found in the new Icom IC-7300.

This discussion is pertinent because advances in analog-to-digital
converter technology is allowing manufacturers toÂ*Â*direct RF sampling
receivers. The Elecraft KX3, Flexradio transceivers, and the new and
much-touted ICOM IC-7300 all have direct RF sampling receivers.

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