[ARC5] ARR-15 ARC-2 variable IF

[Bart Lee]

Some older (1930s) consumer radios used such circuits, and I have seen at
least one in real life, at the CHRS museum.

73 de Bart, K6VK ##
-- --
Bart Lee, K6VK, CHRS Archivist and Fellow, AWA Fellow, ARRL Liaison

Texts only to: 415 902 7168

www.bartlee.com

{Bart(dot)Lee(dot)K6VK(at)gmail(dot)com}
<http://www.lawforhams.com/>



On Mon, Feb 27, 2023 at 9:07 PM Hubert Miller <Kargo_cult at msn.com> wrote:

> A quick consultation with the Shure Brothers told me 10 pF at about 1.2
> MHz is around 12kR. At 500 kHz the impedance is about 33k. It occurred to
> me, why not use resistors
>
> as coupling elements? You would have to use a capacitor in series to keep
> DC at bay. This capacitor will be large enough that phase shift thru the RC
> series will be minimal.
>
> I am thinking, using a pure resistance “might” help optimize, better the
> tuned circuit tracking as well as “possibly” minimizing interaction between
> tuned circuits. Truthfully,
>
> i have in my years only seen one circuit that used resistance coupling
> between two tuned circuits. If you can cite any example you have seen, i
> will truly thank you for telling
>
> me about it.
> What do you think?
>
> I am on Job#1 these days, which is “rightsizing” my accumulation, so i
> cannot divert to these projects, no matter how enticing they may be.
>
> -Hue Miller
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