The ARR-41 is not related to the R-390. It is somewhat related to the AN/ARC-38. It doesn’t need a 400Hz supply, but only 28VDC. The ARC-38 receiver was very good and sensitive, with a marvelous front end.
IMO, replacing the dynamotor with a SS inverter is the way to go. Myself and Ray Fantini used a inverter power supply from a Collins ARC-51BX and worked perfectly. My ARR-41 came with a home made AC supply (Not very well made). If interested, I can provide a few pictures of the inverter mod. The ARR-41 It is a good radio designed for airborne operation with a teletype used in the Navy Neptunes and early Orions. Best, Francesco K5URG Sent from my iPad Sent from my iPad > On Aug 20, 2025, at 15:07, jwkoest <jwko...@charter.net> wrote: > > Is this radio as desirable as an r392?What is the tuning range.Does it > require 400 cycle power?Thanks,Jie/W4NSA Sent from my Verizon, Samsung Galaxy > smartphone > -------- Original message --------From: Barry <n4...@knology.net> Date: > 8/20/25 13:26 (GMT-06:00) To: Robert Meadows <rpmea...@bellsouth.net> Cc: > R-390 Mailing List <r-390@mailman.qth.net> Subject: Re: [R-390] Airborne R390 > on ebay "... does make NOTE of the fact..."I'm getting so bad at that sort of > thing in my emails.Barry - N4BUQ> To his credit, the seller does make not of > the fact that, indeed, it is not a> flying R390 and states the reason he > listed with that in the title.> > 73,> Barry - N4BUQ> >> Well, Here we go > again. The R648/ARR41 IS NOT A FLYING R390. Many think that>> simply because > of the dial which looks like the R390 digital dialThe Radio, ARR>> 41 was > designed and built on a US NAVY Contract for the early P3 Aircraft. It>> was > retrofitted in the P2 as well.Originally intended to be the additional>> > receiver for HF reception of primarily Radito Teletype which was the primary > HF>> communication methodfor about the entire life of the P3 Orion. Navy > MPA>> (Maritime Patrol) folks decided that the pair of ARC 94/xx/xx, civilian > Collins>> 618T HF transceivers were sufficient for the job and as the P3A > "grew">> (actually did as the initial P3 was a shortened Lockheed commercial > turboprop,>> by some 88 inches,the R-648 radios were removed, with some going > into various>> aircraft.>> I have all the manuals, references, as well as the > only existing complete copy>> of the Depot Level Servicing and > Maintenance,ANd,About a dozen of the radios,>> new and as removed racks.>> In > addition to that little treasure trove, I have R648/ARR41 Serial Number X1.>> > A prototype with Collins built internal 120VAC power supply insteadof the>> > standard 28VDC dynamotor, and there are traces of USB/LSB at the AM/CW/CW > Sharp>> switch positions.>> Last time I looked on the federal stock listings, > the radio was still listed as>> active and procurable for something like > (here goes memory) $18,000 with a>> DEMILCode of D, which means that none may > be surplused without total>> destruction. That was changed after the batch I > have were sold.>> I will provide radios that are as removed for $8 ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:R-390@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
