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

[Doran Platt]

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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