[ARC5] Selectivity and the BC-455

[Kenneth G. Gordon]

On 24 Oct 2014 at 18:39, Joel R Roberts wrote:

> Hello Ken and Brian, On page 171, figure 42 shows the graphic of the 
> BC-455-A IF cans as only having one coil in all three cans. These are 
> the diagrams for the 2830kc IF cans 7277, 7278 and 7279 on the part 
> numbers.

Actually, Joel, if you look more carefully at those drawings, you will see a 
representation of that single-layer coil, labled L-6, L-8, and L-10 . So, Bob is 
correct: there ARE two coils in there. Just not two pi-wound jobs. 

> Also in looking at the tables in Gordon White's article 
> "Command Set Receivers for All Frequencies- The Easy Way" it shows the 
> ARC-5 models have 2 coils while the 274-N 6-9.1, 9-13.5, 13.5- 20 and 
> the 20-27 all have only one coil in the IF cans.

Ah! I had forgotten about that! Yes. You're correct as to what it says. 
However, those may have been an early model IFT.

> Lower Frequency IF cans 
> have 2 coils, some fixed and some adjustable.

Hmmm....gotta go re-read Gordon's article.

Ken