duncan@zygot.ati.com (James R. Duncan) (01/20/91)
In article <1991Jan19.012221.2484@Solbourne.COM> kucharsk@Solbourne.COM (William Kucharski) writes: >He's recently inherited a Heathkit shortwave radio which works well for him but >it's got the old "slide-rule" type tuning. He wants to know if there's any >way you can build any type of quasi-accurate digital frequency display for >the tuner, based on the frequency being received. > I have an old Hallicrafters S-76 which I converted to 100% solid state (including synchronous detection!). What I did on this fun little toy was add a simple FET buffer stage to the first LO and then plug in a counter. Being more of an RF person than a digital person, I ran out of gas before creating some sort of method to subtract the 1,650 khz IF frequency from the counter reading. Nevertheless, this counter, which I unplug and use for other things when necessary, works fine as a dial frequency indicator (except for the constant +1650 kHz readout!). -- w ["] | WA6MBV |___|_____..duncan@zygot.ati.com | Jim Duncan H | (408)297-5977 \_____I_____/ 37 3 10N/121 59 10W ---------------