[ARC5] A Table of RU vs. GF/GO/GP Associations

[Mike Morrow]

> I am investigating the GF-11 transmitter. It seems to me to be 
> historically important.

Ken,

The GF is a parasite of the RU.  Literally.  Its power comes from
the associated RU (RU-16 for GF-11) dynamotor and system junction
box.  The RU-16 and GF-11 were always supplied as one set, and if
one is lucky, ALL of the component serial numbers will be the same.

I also like the late RU/GF sets. They have such a 1930s quality about
them that I love.  Even though the Western Electric RU-16/GF-11 has a
1941 contract date, except for coil sets supplied they are essentially
identical to late-1930s A.R.C.-made sets like the RU-13/GF-8.  It is
actually a pretty good design for the time.  A big mistake that some
make is thinking that late RU/GF sets are in any way electrically
similar to late SCR-*-183 and -283 sets.  They are very different
animals.  We're lucky that the USN GF sets don't contain audiophool
vacuum tube relics the way that the SCR sets do.

The table that follows summarizes some of the related information
that I have collected over the years.  It will look really crappy
unless you read e-mail as plain text, or go to list archives which
displays all messages as plain text.

              Models of RU Aircraft Receivers,
   With GF/GO/GP Transmitter And RAT/RAV/RAX Receiver Notes

   Receiver             Transmitter              Contract
Unit   Frequency     Unit     Frequency   Volts  Date        MFR(1)

RU     250-1800      Unknown  Unknown       12   1930        CBY
RU-1   250-14000     Unknown  Unknown       12   1931        CBY
RU-2   224-350,      GF       6200-7700     12   11/10/1932  CBY
       5400-8100(2)
RU-2a  200-400       None (Beacon Band)     12   03/31/1937  CBY
RU-3   224-13575     GF-1     6200-7700     12   02/10/1934  CBY
RU-3a  400-600,      GF-2     3000-4525,    12   1934  
       3000-4500,             6000-9050
       5400-8100
RU-4   224-13575     GO-*/GP-*              12   1935        CBY
RU-4a  224-13575     GF-3     3000-4525,    12   06/29/1935  CBY
                              6000-9050
RU-5   195-13575     GO-*/GP-*              12   05/16/1936  CBY
RU-5a  195-830,      GF-4     3000-4525,    12   1936        CBY
       3000-4525,             6000-9050
       5200-9050
RU-6   195-13575     GO-*/GP-*(3)           12   1937        CBY
RU-7   195-13575     GF-5     3000-4525,    12   1938        CBY
                              6000-9050
RU-8   200-400,      GF-6     2000-4525     12   02/23/1938  CBY
       530-5600
RU-9   200-400,      GF-7     2000-9050     12   10/31/1938  CBY
       530-5600
RU-10  195-13575     GO-*/GP-*(3)           12   1938        CBY
RU-11  195-13575     GO-*/GP-*(3)           12   11/22/1939  CBY
RU-12  195-13575     GO-*/GP-*(3)           24   11/22/1939  CBY
RU-13  195-13575     GF-8     3000-4525,    12   1939        CBY
                              6000-9050
RU-14  195-13575     GF-9     3000-4525,    24   1939        CBY
                              6000-9050
RU-15  200-394,      GF-10    3000-9050     12   12/21/1939  CBY
       530-9050
RU-16  195-13575     GF-11    2000-9050(4)  12   04/21/1941  CW
RU-17  195-13575     GF-12    2000-9050(4)  24   04/21/1941  CW
RU-18  195-13575     GO-*/GP-*(3)           12   04/21/1941  CW
RU-19  195-13575     GO-*/GP-*(3)           24   04/21/1941  CW

                              NOTES
(1) Manufacturer:
    CBY  Aircraft Radio Corporation
    CW   Western Electric Company
(2) Early receiver nomenclature was the same as the transmitter (GF).
(3) GO   through GO-3 covers  300-600 and 3000-13575 kHz (typical).  
    GO-4 through GO-6 covers  300-600 and 3000-26500 kHz.
    GO-7 through GO-9 covers  300-600 and 3000-18100 kHz.
    GP   through GP-7 covers 350-1500 and 3000- 9050 kHz.  
    The A.R.C. RAT or RAT-1 (13500-27000 kHz) can extend liaison
    receiver coverage beyond the RU-* 13575 kHz high end for use with
    GO-4 through GO-6 (26500 kHz high end), and GO-7 through GO-9 
    (18100 kHz high end).
    The A.R.C. RAV (190-27000 kHz) can replace both the RU-* and
    the RAT-* for use with GO-4 through GO-9.
    The G.E. RAX-1 (200-27000 kHz) can replace ALL earlier receiver
    sets for liaison use.
(4) Early GF-11 and GF-12 frequency range is 3000-4525 and 6000-9050 kHz.

RU models (after RU-1) that were not associated with a GF “command”
transmitter were associated with a GO- or GP-series “liaison” transmitter.
Normally, two receivers were associated with each liaison transmitter.
A list of a few associations known from limited USN documentation are:

RU-Series   GO-Series	      GP-Series
Receiver    Transmitter    Transmitter

RU-4        GO-1, -2       GP, -1, -2, -3
RU-5                       GP-3, -4
RU-6        GO-3, -5, -6   GP-3, -4
RU-10                      GP-4, -4a, -5
RU-11                      GP-4, -6, -6a
RU-12       GO-6, -7, -9   GP-6
RU-18       GO-9
RU-19       GO-9           GP-7

I'm still looking for more information on the RU and RU-1, and for contract
dates that are shown with YEAR info only.

Mike / KK5F