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

[COURYHOUSE at aol.com]

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20170708/9d963f6e/attachment.html>