[ARC5] Arrival of a RU-18! now DF loop which one?

Michael Hanz aaf-radio-1 at aafradio.org
Sat Jul 8 08:33:17 EDT 2017 

There is more info on the DU-1 and -2 at http://aafradio.org/docs/DU-1.pdf

If anywhere, you will find mating connectors at 
https://www.ebay.com/sch/m.html?_ssn=kb4dmf&_sop=10&_from=R40&_sacat=0&_nkw=connector&rt=nc

More on the RU/GF connectors and junction boxes at 
http://aafradio.org/docs/RU-GF_junction_boxes.html

On 7/8/2017 4:53 AM, Ed# via ARC5 wrote:
> Mike!! This  great information. Thanks!
> It  gives me a better  idea on the  'system'.
> ---
> Mike and other  folks...
> My error on assuming it  was a command  receiver... I suppose because 
> it  was not large?
> ----
> OK looked at the  DF loop we have  is a DU-1 that looks nice on the 
> outside... on the back the connectors have been modified  for  ham use 
> I think and the innards of  the  bottom box are monkeyed   with.
> In a case this is passable  if no one sees the  back. Some  time _a 
> goal would be  to get an unmolested one if anyone has a spare._
> ----
> QUESTION -  the  DU1 and 2  require power  would  this be off the 
> dynamoter rather than having the second RU-18 plugged in?
> ----
> Our  next move is to pursue  the dynamotor and control box and 
> junction box. Please  drop us a line if  any to share...
> ---
> It would be nice to have a mating power connector to the receiver so 
> we can try a power up from a power supply? It was alleged it was used 
> in the early 2000's  but  the family tossed the power supply. (it 
> looked  really homemade but worked and had the connector  and.. wish 
> we had it!)
> ----
> As with any of the displays we have,  we like to integrate photos, 
> drawings, etc  of the gear installed  and in use during the era. If 
> anyone has  imagery to share, either original or scans, please drop us 
> a line.
> ---
> Thanks   Ed# www.smecc.org <http://www.smecc.org>
> Message: 2
> Date: Fri, 7 Jul 2017 00:59:36 -0400 (EDT)
> From: Mike Morrow <kk5f at earthlink.net>
> To: COURYHOUSE at aol.com, milsurplus at mailman.qth.net,
>     arc5 at mailman.qth.net
> Subject: Re: [ARC5] Arrival of a RU-18! now  DF  loop  which one?
>
>
> Ed wrote:
>
> > Arrival of a RU-18! now DF loop which one?
>
> The WECo RU-18 is a LIAISON version of the RU-series receivers, The 
> RU-18 SYSTEM is designed for 14 vdc and uses receiver CW-46048D. (The 
> RU-19 uses the same CW-46048D receiver in a SYSTEM designed for 28 vdc 
> by using heater voltage dropping resistors in the system junction box, 
> plus a 28 vdc dynamotor.)
>
> The RU-18 system is NOT designed for COMMAND service using a GF-series 
> transmitter.  Instead of a GF transmitter, the RU-18 system dynamotor 
> and junction box can supply a second CW-46048D receiver.  The liaison 
> transmitters most commonly used with a RU-18 receiver are the 
> Westinghouse GO-9 and GP-7.
>
> The DF loops that would be used are the manually-positioned DU-1 or -2 
> locally-trained loop inside the cockpit of single-engine aircraft with 
> radio operator, or the electronically-similar manually-positioned 
> outside airframe loop DW-1 in larger patrol aircraft.  In 
> single-engine carrier-based aircraft the DU-* loop disappeared as it 
> was replaced by the ZB-* VHF homing adapter, which similarly fed the 
> RU-series receiver.
>
> > Interesting the RU-18 is a TRF set...did not realize that.
> > We have some sets of coils and would like to get some of
> > the control boxes and dynamotor to display with it.
>
> The principal items needed for a RU-18 liaison receiver SYSTEM are:
>
> CW-46048D      Receiver RU-18 (1 or 2)
> CW-62007A      System Junction Box
> CW-21215A      Dynamotor
> CW-23087       Control Box (1 or 2)
> CW-47###       Receiver Tuning Coils (19 different)
>
> NONE of these RU-18 LIAISON set components are interchangeable with 
> visually similar COMMAND SET components of the GF-11/RU-16.  Receiver 
> coil sets are interchangeable.
>
> > Would also be nice to get a companion transmitter to go with
> > it as we  did  with the  ARC 5  stuff.  Need power connectors
> > and control boxes test stuff etc...
>
> The easiest and smallest authentic LIAISON transmitter is the GP-7.
>
> CAY-52173A     Transmitter-Rectifier
> CAY-23219      Pilot's Control Box
> CAY-23220      Operator's Control Box
> CAY-47125      MF Antenna Tuning Unit
> CAY-4715#      Transmitter Tuning Units (6 different)
>
> >  Did they use these throughout the entire war...
>
> Yes.
>
> > ...or were they replaced by ARC 5s?
>
> There were NO receivers of this LIAISON type that got replaced by ARA 
> or AN/ARC-5 units...those are COMMAND service systems.
>
> Competing and more modern LIAISON receiver SYSTEMS were the GE RAX-1 
> and to lesser extent the RCA ARB.  (Theee is a photo somewhere on the 
> net of a USN LTA airship with GP-7 and ARB installation, and use of 
> the ARB with the Collins ATC was common.)  A.R.C.'s eight-receiver RAV 
> was intended for liaison service to replace the liaison RU-series, but 
> the RAV rightfully failed in competition with the significantly 
> superior RAX-1.
>
> There are different-design COMMAND versions of the RU-series receivers 
> that support an associated GF-* transmitter instead of a second 
> receiver.  The most commonly-encountered systems are the WECo 
> GF-11/RU-16 (14 vdc) and GF-12/RU-17 (28 vdc). Compare the components 
> of the COMMAND set GF-11/RU-16 below to the components of the LIAISON 
> set RU-18 above.
>
> CW-46051A      Receiver RU-16
> CW-52063A      Transmitter GF-11
> CW-62008A      System Junction Box
> CW-21109A      Dynamotor
> CW-23049       Antenna Relay
> CW-23096A      Receiver Control Box
> CW-23097       Transmitter Control Box
> CW-23098       Extension Control Box
> CW-47###       Receiver Tuning Coils (19 different)
> CW-471##       Transmitter Tuning Coils (8 different)
>
> None of these components are interchangeable with those of the RU-18, 
> except receiver coil sets.
>
> Mike / KK5F
>
>
>
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