[ARC5] TN 1B/APR-1 and TN 2B/APR-1 Military Radio Tuners

[WA5CAB at cs.com]

Actually, there is one more model in the mix that no one has mentioned yet. 
 AN/SPR-1.  Same main frame containing the IF and audio strip and power 
supply as the one in AN/APR-1, different antennas.  It replaced the RDO.  There 
were also two sets of plug-ins, the low numbers marked /APR-1, and the high 
numbers marked /APR-4.  They are interchangable other than the earlier ones 
don't have motor drive sweep.  And by nomenclature there is a fifth one, 
AN/ALR-5.  Same receiver mainframe as late AN/APR-4 but three-band plug-in 
tuning unit CV-253/ALR.  It only covers 38-1000 MC.

If anyone wants any of these units, I some some of it, including manuals.  
No antennas, though.

In a message dated 3/23/2011 3:04:59 PM Central Daylight Time, 
jfor at quik.com writes: 
> True. However the RDO was not built for airplanes either. So the RDO and
> SPA-1 went together on ships and subs and the APR-4 and APA-6A went
> together in planes, AFAIK.
> 
> -John
> 
> =============
> 
> 
> >The SPA-1 had a steel cover and heavy duty shock mounts and was primarily
> >for shipboard systems. The APA-6A was the same except for having an
> >aluminum
> >cover and lighter shock mounts and was intended for airborne use.
> >
> >John WA4WDL
> >
> >--------------------------------------------------
> >From: "J. Forster" <jfor at quik.com>
> >Sent: Wednesday, March 23, 2011 3:04 PM
> >To: "jmfranke" <jmfranke at cox.net>
> >Cc: <kgordon2006 at frontier.com>; "Roy Morgan" <k1lky at earthlink.net>; 
> "ARC-5
> >List" <arc5 at mailman.qth.net>
> >Subject: Re: [ARC5] TN 1B/APR-1 and TN 2B/APR-1 Military Radio Tuners
> >
> >>And, more importantly, the SPA-1 special purpose oscilloscope to measure
> >>PRF and Piulse Width.
> >>
> >>-John
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480