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

[jmfranke]

Another interesting point is the CQ Surplus Schematics Handbook (Cat. No. 117) shows the ARC-1 version had the same six-pin connector on the front of the receiver as did the P-540 and the ARC-1 receiver could be powered from an external 6V/12V plus 250V external power supply or an internal 12V dynamotor. The schematic is shown under the title APR-1 on page 7, but there is a label in the lower left that says ARC-1.

John WA4WDL


From: WA5CAB at cs.com 
Sent: Wednesday, March 23, 2011 6:40 PM
To: jmfranke at cox.net ; arc5 at mailman.qth.net 
Subject: Re: [ARC5] TN 1B/APR-1 and TN 2B/APR-1 Military Radio Tuners


You're right.  I didn't go back quite far enough.  And also, the ARC was in between the P-540 and the ARC-1 (unlike in the AN system, the suffix number indicated a later mod, contract or both).

In a message dated 3/23/2011 4:38:17 PM Central Daylight Time, jmfranke at cox.net writes: 

  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.


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