[R-390] R-390A alignment..

[Bob Camp]

Hi

The “magic” variable is the permeability of the core material. I’d say it’s a good guess that the radio was designed for material A and then material B was substituted .

Bob


On Sep 2, 2014, at 7:20 PM, Pete Williams <jupete at internode.on.net> wrote:

> G'day all... I've done a few restorations but have a  query on a variation
> not so obvious on alignment  procedure
> The  4 - 8 Mhz rack. when fully  adjusted , ends up with the  slug tops
> almost level with the   rack ....... this is at variation with all the
> others both past and present. The  adjacent rack  somewhat similar but not
> as bad..
> I am aware of  cam  setting  and possible  trimmer/capacitor problems  and
> even incorrect  slugs, but this one  seems to defy convention !.
> What I've  done is .... checked  cam settings--- even tried slightly
> different position,.
> Repositioned interrelationship of  trimmer settings with  core  settings
> Changed slugs.
> Installed a  new set of  coils.
> RESULT.... all alignment same  as  before and  sensitivity OK..... I don't
> like the  slugs being inserted so  far into the  coils--- doesn't  seem
> right for me.
> I've followed Roger R's  listings  over the  years   and maybe he might
> have  an  explanation.
> Thanks
> Pete VK3IZ
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