[R-390] Theory Question - RF Transformer Alignment

[Gene Beckwith]

Ed Zeranski wrote:
> ..................... I didn't realize the cams were spirals and
> thought they were trial and error shaped  to linearize the inductance change
> to a linear frequency change.
>
> ..... This was what my spreadsheet calculation indicated when I tried to
> reach convergence with a coil that had a linear inductance profile.  I have
> no doubt an inductance profile could be imagined that would defy
> adjustment.....
>
> I'm more impreesed with the '390 receivers every time I see posts like this.
> Those Collins guys must have had really excellent integration of electrical
> and mechanical design efforts, all to the tune of juggled slide rules.
>
> EdZ KG6UTS
> EAC #237 1960 contract
> SW 1959
>
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>   
Gents, 

Excellent series of posts...all added to the R-390x files...for 
pondering and reflection on these great Heavy Metal radios...

73, 

Gene
W8KXR