[Milsurplus] myster box

[J. Forster]

I assume there are no name plates. If it is indeed an ASB-5 receiver, please
email me before putting it up on eBay.

Thanks,
-John

Jack Antonio wrote:

> My first guess would be the receiver from the ASB
> radar sets. Schematics were publishied in the
> Surplus Handbooks of yesteryear.
>
> Jack
>
> Jack Antonio WA7DIA
> scr287 at sbcglobal.net
>
> ----- Original Message -----
> From: "Ray Fantini" <RAFANTINI at salisbury.edu>
>
> . Their was
> > a receiver about the size of a shoe box that had a ARB remote tuning
> > head with right angel adapter on it and looking at it I thought that
> > maybe I can sell the head on EBay so I paid $5 for it. After removing
> > the head I started looking at the receiver, the more I look at the
> > receiver the more I realize I have not seen anything like it before.
> > There are no identifying plates or markings on the radio, it has a
> > primitive coaxial cavity input directly coupled to a 955 mixer that is
> > fed by a 955 oscillator tube located next to it. The oscillator tube is
> > tuned by a movable signal plate capacitor that travels in a cylinder
> > located on the front of the radio, this is wear the ARB head was
> > connected to vary the capacitor. The size of the tuning plate is about
> > as big as a half dollar. The output of the mixer ( 955) feeds the first
> > IF transformer and a IF string of 6AC7 tubes, beyond the third IF stage
> > is a 6J5 oscillator capacitor coupled to the grid of the fourth IF amp,
> > don't appear to be a mixer, just like a injection for no reason I can
> > determine. Then there are three more stages of IF amplifiers all 6AC7
> > and a 6H6 configured as a envelope detector. The output of the detector
> > is capacitor coupled to a 6AC7 then a 6AG7 and carried out to a coaxial
> > connector. It appears to me that everything from the detector out is a
> > wide band video circuit.
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