[Milsurplus] ART-13 Transmitter

[Mike Morrow]

Richard wrote:

>Is there an easy way to differintiate the different ART-13 models/variants
>like the USN ATC, T-47/ART-13, AN/ART-13 and A versions?  
>
>Where can I locate documentation on the AN/ARC-8 and AN/ARC-25?

--DESCRIPTION OF AN/ART-13 VARIATIONS--

----- USN ATC -----
ATC           Collins-made USN transmitter COL-52286.  2000 to 18100 kHz.
ATC-1         Same as ATC, but made by CZR (Zenith)

----- USN AN/ART-13 -----
T-47/ART-13   Same as ATC, except with JAN nomenclature.

The ATC-* and T-47/ART-13 are essentially identical.  In some cases, ATC units
have simply had “T-47/ART-13” paint stenciled near the original ATC name plate.

A couple of variations made be found on any of these:
(1)  Early units *may* have the old rail-style mounting rails (like the
MT-161/ART-13) instead of the later, improved MT-283 and 284/ART-13 mounts.
(2)  Early units *may* have the two-tube 8Q-1 MCW-CFI calibration unit, later
units have the three-tube 8Q-2 MCW-CFI unit.

Units *may* have an O-16/ART-13 LF/MF (200 to 1500 kHz) oscillator installed.

The calibration book is thin because cal data is printed at intervals as large
as 10 kHz on the higher end of transmitter frequency coverage.  Different cal
books are required based on which of the two MCW-CFI units is installed.


----- USAAF/USAF AN/ART-13A -----
T-47A/ART-13  Improvement of USN T-47; used by USAAF/USAF.
(1)  Unit always has the 8Q-2 MCW-CFI unit.
(2)  Unit always has the MT-283 and MT-284/ART-13 mounting system.
(3)  Unit has a vernier scale above HF VFO dial B which allows more precise 
dial setting.
(4)  Unit has a dynamotor control power interlock switch that interrupts
control power when the top lid is removed.  This switch is on the left 
hand side, above the antenna connections.

The calibration book is thick because cal data is printed at intervals of
1 kHz throughout entire transmitter frequency range (made possible by item
(3) above).

Units *may* have an O-17/ART-13A LF/MF (200 to 600 kHz) oscillator installed.


----- USAAF/USAF AN/ART-13B (Early Model) -----
T-47A/ART-13 with CDA-T crystal control unit installed in place of O-17.
This provides four LF/MF and twenty MF/HF crystal-controlled channels.


----- USAAF/USAF AN/ART-13B (Later Model) -----
T-412/ART-13B consisting of modified USAAF T-47A, or USN T-47, or ATC-* units
with CDA-T crystal control unit installed in place of O-16 or 17.  This provides
four LF/MF and twenty MF/HF crystal-controlled channels.  A Low Frequency
Extended Range switch is installed below the front panel instruction plate
which allows crystal control operation in the 1670 to 2000 kHz range when
in the EXTEND position.  When made from modified USN ATC-* or T-47 units,
these will often (but not always) have been upgraded with T-47A improvements.


----- Commercial Collins Designation -----
The Collins Company issued a commercial model number of 17H-2 to the T-47/ART-13.
This is similar to the Collins R-105/ARR-15, which had a commercial model number
of 51H-3.

Note on transmitter calibration books:  Books are usually not serialized to a
particular transmitter.  There was no need.  The data is essentially identical
between all makes and models.  Older units with the early 8Q-1 MCW-CFI unit will
have different calibration check frequencies indicated in the data tables, and
AN/ART-13A cal books will have data at 1 kHz intervals through the entire tuning
range.  AN/ART-13A cal books (USAAF/USAF) were usually attached to the transmitter
with a rubber-covered chain, while USN cal books were not.  In spite of this, the
cal books are almost always missing on all transmitters, and are much harder to
find than are the transmitters.  Fortunately, the readily available manuals for
these transmitters (see below) reproduce all the necessary cal data.


----- USAAF/USAF AN/ARC-8 -----
The USAF manuals for the AN/ART-13A and B (for example, 12R2-2ART13-2) define
the AN/ARC-8 and provide inter-component wiring diagrams.  Major components are
the T-47A/ART-13 and BC-348-* (also known as the AN/ARR-11).  For this manual
and others, see: 

http://bama.edebris.com/manuals/miltest/an-art13/ 


----- USN AN/ARC-25 -----
Doubtless there is documentation of the precise make-up of the AN/ARC-25, but
I don’t have a copy of it.  Major components are the T-47/ART-13 and the
R-105/ARR-15).  These will usually have a C-733A/ARR-15A receiver control panel
and a C-740/ART-13 control panel at the pilot's position, which marks the first
time both the T-47 and its associated receiver can both be controlled remotely.
There’s a short description of the AN/ARC-25 from JANAP 161 at:

http://jptronics.org/radios/Military/JANAP161/an.ac/an.arc-25.pdf .

I hope this provides some of the info you were seeking.

Mike / KK5F