[ARC5] ARC-5 and SCR-274-N IF Transformers

[Ian Wilson]

I happen to have a 7276 (1415 kc 3rd IF) here on the desk. This has split
coils, ceramic spacers, and a grounded metal ring between the coils. Sorry
I don't recall what receiver this is from.

73, ian K3IMW



On Wed, Apr 16, 2014 at 12:46 PM, D. Platt <jeepp at comcast.net> wrote:

> As if everyone hasn't seen enough on this subject already... Ted, W3PWW
> and I have been kibitzing on the phone and comparing schematics, mechanical
> drawings, and such and appear to have determined that, indeed, the Navy
> used dual-tapped transformers in the 2nd and 3rd IFs.  Also, according late
> manuals, there may also be differences for sets manufactured after 1945.
>  It may be well that each set should retain its original transformers,
> although as I mentioned yesterday, I know I've crossed over with no noted
> issues.  Now.. on another tack, I said I thought one could probably modify
> the 40 meter (6.9.1 MHz) receivers in the same manner as the 80 meters
> receivers.  Looks like that's not the case.  Looking at the various
> mechanical drawings, the SCR-274-N receivers appear to have a one-piece
> coil form, and are not eligible for the mod, as written.  The Navy units,
> on the other hand, look like they still have the split coils and ceramic
> spacers.  Ted's having a look at his 40 meter receivers to see what's the
> real story.  The thing is, why would the manufacturers use a different
> methodology for the two services?  Makes no sense, to me.  If anyone else
> has any info, it would be good to know what you've found out.  At least the
> 80 meter rigs are good to go.
>
> Jeep - K3HVG
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