[Milsurplus] Receiver wanted (for GO-9) MUCH ADDITIONAL INFO

[Mike Morrow]

Howard wrote:

> Want to match something up with my GO-9. Looking for an ARA, RAX-1, RU4, 
> 4A, 5A, 6, 14, etc. Needn't be working, repairable, restorable OK. Is 
> this a pipe dream?

The GO-9 can be used in 14 or 28 vdc aircraft.  Below are historically-accurate matches for the 1940 GO-9 (0.3 to 0.6 and 3.0 to 18.1 MHz) liaison transmitter:

--From your list--
1.  Rule out RU-4A, RU-5A, and RU-14.  Those are command set receivers used with transmitters GF-3, GF-4, and GF-9, respectively.  The RU-4A and -5A are 14 vdc units from 1935 and 1936.  The 28 vdc RU-14 dates from 1939.  They are all very rare today.

2.  Rule out RU-4.  It is a 14 vdc liaison system that uses two CBY-46048 receivers.  It dates from 1935.  Likewise rule out RU-6.  It is a 14 vdc liaison system that uses two CBY-46048B receivers.  It dates from 1937,  These two systems are too early to have been used with the 1940 GO-9, and are very rare today.

3.  Rule out ARA or ARB.  Those are 28 vdc command set receivers eith top coverage of 9.1 MHz.  There are many instances of USN using C-131/AR-equipped R-26 and R-27/ARC-5 receivers or even the ARB with the AN/ART-13 in remotely-controlled installations (the USN had otherwise no receivers for remote operation), but these were not used with the locally-controlled GO-9.

The most appropriape matching receiver systems for a GO-9 are:

-  RU-18 (14 vdc) or RU-19 (28 vdc)  (0.195 to 13.575 MHz).  Each normally uses two CW-46048D receivers.

-  RAX-1  (28 vdc)  (0.200 to 27.000 MHz).  A complete 28 vdc three-receiver system is difficult to put together today, but it would be the best of all candidates.

There are three other liaison receiver candidates for a 1940 GO-9:

- RU-11 (0.195 to 13.575 MHz) plus RAT (13.5 to 27.0 MHz), 14 vdc (1939)

- RU-12 (0.195 to 13.575 MHz) plus RAT-1 (13.5 to 27.0 MHz), 28 vdc (1939)

- RAV   (0.190 to 27.0 MHz), 28 vdc (1940)

These sets are very to extremely rare, especially the RAV receivers.  They lost out to the RAX-1 as receiver systems that covered above 13.575 MHz.  They were made only in very small quantities (50 or less).

Ed...

The RU-18 is a 14 vdc system, while the RU-19 is 28 vdc.  Physically and electrically these two systems are identical (including use of identically wired 14 vdc CW-46048D receivers) except for the dynamotor input voltage, junction box power relay coil voltage, and junction box receiver filament voltage dropping resistors for the RU-19.

In the GO-9, except for two 14 vdc intermediate frequency section and high frequency section antenna switch relays, everything runs off 120 vac, 800 Hz.  These relay coils are arranged in series for 28 vdc or parallel for 14 vdc.

Mike / KK5F