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

[jmfranke]

There was the ARC-1 as well. Yes, the designation ARC-1 was changed to the 
familiar VHF transceiver, but the APR-1 started as the ARC-1 (SCR-587). 
However, tuning units from the ARC-1 were not directly compatible with the 
APR-1 and APR-4 because they lacked the socket for the motor drive 24Vdc 
pin. Otherwise, they were compatible. The field change required one to drill 
the matching hole in ARC-1 tuning units. And, there was the receiver that 
started it all, the General Radio P-540 test receiver designed by Don 
Sinclair.

John WA4WDL.


--------------------------------------------------
From: <WA5CAB at cs.com>
Sent: Wednesday, March 23, 2011 4:46 PM
To: <arc5 at mailman.qth.net>
Subject: Re: [ARC5] TN 1B/APR-1 and TN 2B/APR-1 Military Radio Tuners

> 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
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