[ARC5] IF transformers.

[Kenneth G. Gordon]

Thanks for the info, Brian.

Ken


On 16 Jun 2013 at 9:51, Brian Clarke wrote:

> Hello all,
> 
> Mechanically, all that you say is correct. And any Tech O in the last 70 
> years could have changed the base mounting plate around and daubed the 
> correct red paint. I have found my daughter's red nail varnish does an 
> excellent job.
> 
> Electrically, there is a difference between the third IFT and the other 
> two - all the coils are the same, except that the third has been tapped down 
> to give different input and output impedances, while still maintaining the 
> same trimmer capacitors as in the other two IFTs. To tell whether you have a 
> third IF transformer, you will need to check that the outer connections go 
> to the trimmer, and a tapped wire, not connected to any internal capacitor 
> goes to the base connector.
> 
> So, Ken, if it really was a third IFT and you want to use it as a first, you 
> need to change the internal connections to match your second IFT, ie, base 
> connections across the whole coil for primary and secondary.
> 
> 73 de Brian, VK2GCE.
> 
> On Sunday, June 16, 2013 9:28 AM, you said:.
> 
> 
> > On 15 Jun 2013 at 18:04, WA5CAB at cs.com wrote:
> >
> >> We know that a PO had the
> >> cover off (and reinstalled it backwards) because if you just remove the 
> >> mounting bracket and
> >> rotate it 180 deg. so that you can plug the thing into the 1st IF 
> >> position with the tube cover on, the
> >> dot would still be toward the front.
> >
> > You are absolutely correct: that is exactly what happened, but it wasn't a 
> > PO. It was,
> > apparently, the factory. The cover was on the can 180 degress around. The 
> > red line on the
> > bottom of the cover was on the side opposite the red line on the base. 
> > They should have
> > been on the same side.
> >
> > The screws were very difficult to remove as the original red locking-paint 
> > was still there.
> >
> > I was (again) surprised.
> >
> > This is the very first "ARC-5" receiver I have ever seen which had two 
> > factory assembly
> > errors.
> >
> > Ken W7EKB
> 
> 
> 
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