Ham Radio Delux (more correctly spelled Deluxe) - HRD for short - enhances the ham radio user experience by adding an external software layer on an amateur radio transceiver's existing hardware and firmware.
HRD effectively takes advantage of (relies on) the highly sophisticated signal processing electronics already on board today's modern hardware rigs.
In the 60's, schematics of transistorized outboard local oscillators appeared in the ham magazines to solve the drifting problems that plagued many affordable tube-type transceivers.
Many versions of these experimental outboard oscillators began to appear in ham shacks.
As a result of these experiments, the Drake TR-4C came out incorporating a "solid state" (transistorized) local oscillator.
Thus the Drake TR-4C became one of the first "hybrid" transceivers on the market.
The Windows-based HRD amateur radio control software reminds me of the Drake TR-4 "hybrid" transceiver I had in the early 70's.
This heralded the beginning of a series of "solid state" modules that, in the following years , gradually invaded the "innards" of amateur radio transceivers and receivers.
Signal processing in an amateur radio has been done with increasingly complex circuitry (hardware and firmware) over the past few decades.
HRD adds a PC-based user interface on top of that technology.
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