Well, I just found that, on Page 90 of TM 11-5820-357-35, it clearly states: "The vfo frequency is decreased with a clockwise rotation of the vfo shaft as viewed from the front panel."
I bet it would be a great idea for me to READ THE MANUAL! Thanks, Barry - N4BUQ On Mon, Sep 16, 2024 at 7:50 AM Barry Scott <[email protected]> wrote: > Okay, Larry. Thanks for the reply. > > On further reading, the VFO is a Hartley design and, given that the > frequency formula for a Hartley is an inverse function of the LC values, > presuming that at xx 000, the iron core is "out" of the coil and a > clockwise turn of the KC knob causes the core to be pushed further inside > the coil increasing the L, then the frequency would indeed drop with CW > motion of the knob. Sorry for the awkward way of stating that but I think > it makes sense to me. > > Thanks again, > Barry - N4BUQ > Thanks, > Barry - N4BUQ > > > On Sun, Sep 15, 2024 at 11:10 PM Larry Haney <[email protected]> wrote: > >> Hi Barry, You are absolutely correct in your deductions. When the KC is >> at its lowest of 000, the vfo is at its highest (3.455 mh). >> >> Regards, Larry >> >> On Sun, Sep 15, 2024 at 7:23 PM Barry Scott <[email protected]> >> wrote: >> >>> Looking at the simplified schematic for the 3rd mixer (V205), the output >>> from the 2nd mixer (V204) tunes from 3 to 2 MC and the VFO tunes from >>> 3.455 >>> MC to 2.455 MC yielding a constant 455 kc mixer product. Is it correct >>> to >>> interpret those numbers to mean that if the counter starts at XX 000 and >>> the KC control is rotated CW to XX +000 the VFO's output frequency starts >>> at 3.455kc and falls 1000 kc for 10 turns CW on the KC knob? >>> >>> I'm asking because I want to know what the frequency of the VFO is >>> supposed >>> to be when the dial is at XX 000 and I presume it's 3.455 kc but wanting >>> to make sure. >>> >>> Thanks, >>> Barry - N4BUQ >>> ______________________________________________________________ >>> R-390 mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/r-390 >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> >> ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
