[ARC5] What the heck is a "1/2 harmonic Q-5er?

[Bob Groh]

Jeep, so the demod and audio was all handled inside the BC-453 after the IF
signal left the BC-348?  Still dying to see that original article.

Bob, WA2CKY

On Sun, May 10, 2020 at 7:48 AM Doran Platt <jeepp at comcast.net> wrote:

> OK... herewith positively confirm that the BC-453 was tuned to 407 kHz.
> Fortunately, I have some high res photos of my ARC-8 setup.  Looking at the
> dial, and a placard I made up, its clearly 407 kHz.  BTW, there was no
> hacking of the BC-348.  A small insulated pickup loop was positioned at the
> base of the last IF.  The connectorized RG-174 coax is routed to the grid
> cap of the BC-453 mixer via a tacked on 10pf dipped mica. The reason for
> going to the mixer was to bypass the front end of the BC-453 which would
> attenuate the 457.5 kHz signal from the BC-348. That was the setup and it
> works marvelously well.
> Jeep K3HVG
>
>
>
> > On May 9, 2020 at 7:53 PM Hubert Miller <Kargo_cult at msn.com> wrote:
> >
> >
> > So maybe I finally understand this, maybe not.
> > In the video, the guy's BC-453 is tuned to 420 kHz. That means osc = 420
> + 85 = ~505.
> > Harmonic = 1010.
> > Harmonic - 915 kHz BC-348 IF = 95 kHz. Maybe one or the other is not
> aligned quite right ?
> > Should be 85 kHz.
> >
> > There should be another point, I think, on the 453 dial where this would
> work.
> > BC-453 dial = 330 kHz. Osc = 330 + 85 = 415.
> > 415 x 2 = 830;  915 - 830 = 85 kHz.
> >
> > For the ARC-2, the challenge is, the IF continuously varies with the
> main tuning. What fun
> > that is. I think, IF the above stuff is correct:
> > 3885 kHz = ARC-2 IF  @ 1295 kHz.
> > 1295 kHz - 85 kHz = 1210 kHz.
> > If BC-453 is set to 520 kHz, osc is at 520 + 85 = 605 and second
> harmonic is 1210 kHz.
> >
> > Of course, I may have gone of the rails at point A.
> > -Hue
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