[ARC5] (no subject)

Leslie Smith vk2bcu at operamail.com
Thu Sep 2 20:29:47 EDT 2010


Hello Group:
Yes, this is an interesting "one".  I don't know these sets well enough to know if the broadcast band sets came with a "loop" antenna selector.  I have a "navigation band" set (late WWII) with a "loop" antenna selector.  The setup is identical to what I see in the photo.  This is consistent with your observation about stencil showing 190 to 520kHz on the back panel.

Since all the IF transformers and the coil pack mount in sockets in, it's would be easy to believe these sets were made in a basic configuration (valves, tuning capacitor, wiring) and "configured" by simply by plugging in the correct coil box and IF transformers.  At least this is how I imagined the design concept at first.  I was always impressed by this concept.  Very clever.  Wrong, wrong, wrong, or at least not that simple.  Different sets in the same series (eg R-23 and R-26 from the ARA specification) have small components that are different.   For example, the local and BFO plate dropping resistors are not the same value across the range.  The lower frequency sets use higher value dropping resistors than the higher frequency sets.  I assume this is because the oscillators "take off" more readily at the lower frequency.

Anyway, I digress from the set seen on "the bay".  Who-ever buys it will find one or two surprises not apparent from the photos, I'm certain.  For example, the dividing plate that separates the valve compartment from the tuning capacitor is missing.  This will make the set more prone to drift, because of the transfer of heat.

O can't imagine why some-one would take the components from a rarer broadcast band set to modify a common "navigation" set.  

Les




> ----- Original Message -----
> From: WA5CAB at cs.com
> To: arc5 at mailman.qth.net
> Subject: Re: [ARC5] (no subject)
> Date: Thu, 2 Sep 2010 15:10:08 EDT
> 
> 
> Well, it is a shame.  But there's more to this than meets the eye.
> R-148/ARC-5X tunes (originally) 190-550 KC (and see rear view photo - this was
> probably originally an R-148).  But not only has the tuning dial been replaced
> with one from an R-24 or equivalent, the IF transformers (or at least the 3rd
> one) have been changed as well.  One of the side view photos show the top
> of the 3rd IF, which has 239 KC stenciled on it, instead of the original 85
> KC.
> 
> In a message dated 9/2/2010 1:54:30 PM Central Daylight Time,
> vk2bcu at operamail.com writes:
> > R-148 550kHz to 1500kHz
> > 14 Volts Supply
> >
> >
> > >----- Original Message -----
> > >From: LARRY D GODEK <telegrapher at q.com>
> > >To: arc5 at mailman.qth.net
> > >Subject: [ARC5] (no subject)
> > >Date: Thu, 2 Sep 2010 14:10:36 +0000
> > >
> > >
> > >
> > >230517606109
> > >
> > >What a shame.
> > >
> 
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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