Hello, The frequency counter with IF offset method was used in the first generation HF receivers with a digital display, like a Yaesu FRG-7700, or Kenwood R-1000. More modern radios have the radio processor drive the frequency display directly. One reason is different offsets are required based on Mode, Passband Tuning, and Filters.
A digital volume control knob can use a analog-to-digital-converter, but the common method for knob tuning is not really analog. The knob is hooked to an encoder that outputs two digital signals to indicate knob rotation and direction. This method has been used in radios for years. The Watkins Johnston Receivers planned for the listening lounge have a nice heavy tuning knob, but the knob is still fastened to a digital encoder feeding the radio processor. There is also a numeric keypad and two skew buttons to set the receive frequency. It is great that they integrated more functions into the chip so even the low-end radios can have a tuning knob. 73 Eric On Wed, 21 Jan 2015 21:10:53 -0500, Ed Cummings <[email protected]> wrote: > Today I received this interesting applications note from Mouser > Electronics which specifically mentions some technical challenges > that designers of AM and shortwave radios face using DSP > technologies. This paper might interest some SWLfest list subscribers. > > http://www.mouser.com/applications/next-gen-radio-ics-audio/?utm_medium=email&utm_source=january2015&utm_campaign=cm-audio-en&utm_content=article2rm > > Cheers, > > Ed Cummings > > _______________________________________________ > Swlfest mailing list > [email protected] > http://montreal.kotalampi.com/mailman/listinfo/swlfest > > To unsubscribe: Send an E-mail to > [email protected]?subject=unsubscribe, or visit the URL shown > above. > > For more information on the Fest, visit: > > http://www.swlfest.com > http://swlfest.blogspot.com _______________________________________________ Swlfest mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/swlfest To unsubscribe: Send an E-mail to [email protected]?subject=unsubscribe, or visit the URL shown above. For more information on the Fest, visit: http://www.swlfest.com http://swlfest.blogspot.com
