What, like this? (see attached df file) I designed just such a thing for use with the BITX20 HF TRX. Rotary encoder allows one to "tune" with a knob with the LCD reading out the relative "dial" frequency (VFO-IF in this case)
Mark. On Thu, Jan 22, 2015 at 11:47 AM, Eric Cottrell <[email protected]> wrote: > 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
avr_dds_homebrew_i2clcd.pdf
Description: Adobe PDF document
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