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

[Kenneth G. Gordon]

On 16 Apr 2014 at 15:46, D. Platt wrote:

> indeed, the Navy used dual-tapped transformers in the 2nd and 3rd IFs.

Tapped. In what way? Center-tapped? What? Are the taps connected to 
anything? If so, what?
  
> 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.

I thought I had mentioned some time ago that this was, more than likely, not 
possible.

>  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,

Yes.

> and are not eligible for 
> the mod, as written.

No.

>  The Navy units, on the other hand, look like they 
> still have the split coils and ceramic spacers.

Some do, some don't.

>  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?

I wondered the same thing...

>  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.

Yes.

BTW, I have quite a number of "loose" IF transformers here. If it got right 
down to it, I could dismantle a bunch and check them.

I also have a list somewhere of the IF can numbers and to which receivers 
they belong. I'll try to dig it out.

Kenneth G. Gordon W7EKB

"Courage is being scared to death but saddling up anyway."--- John   Wayne