[Milsurplus] WTB: ART-13 Hand Crank and Calibration Book

[Mike Morrow]

Mack wrote:

> A calibration book for the pocket under the ART-13. This is for an
> ART-13/B.

Mack,

As I mentioned a few days ago, there are several versions of the 
calibrations books, but NONE of them will say "AN/ART-13B" on
them.

All the T-412/ART-13B transmitters are converted from earlier
versions of the ATC, ATC-1, AN/ART-13, or AN/ART-13A.

The correct cal book for your T-412 will be one for the version
from which your T-412 was converted.  Often, the old version
nomenclature tag is still present on the right side-panel, with
a metallic strip riveted over part of the old tag that has the
new "T-412/ART-13B" designation.

Base Transmitter Identification

The best version of the T-412 is the one made from T-47A/ART-13
(AN/ART-13A) transmitters, or T-47/ART-13 transmitters with the
M2 Modification.  If the original nomenclature tag is missing or
covered, you can tell that you have a T-47A by:
1.  A vernier scale above the knob skirt of VFO dial B.
2.  Top cover dynamotor control power interlock switch on left side
    that opens when the top cover is removed.
3.  8Q-2 MCW-CFI unit.
4.  Small hole drilled in right front cal book tray and attached
    rubberized chain for the cal book appear on most T-47A units.

***This version needs a cal book for the "AN/ART-13A".***


The next best version of the T-412 is the one made from ATC, ATC-1,
or T-47/ART-13 transmitters that have the 8Q-2 MCW-CFI unit installed
in the right rear corner of the transmitter.  These transmitters
will LACK characteristics 1 and 2 listed above for the T-47A.  The 8Q-2
MCW-CFI unit uses three tubes.

***This version needs a cal book for the "AN/ART-13" or the "ATC-*"
with 8Q-2 MCW-CFI.***


The next version of the T-412 is the one made from ATC, ATC-1,
or T-47/ART-13 transmitters that have the 8Q-1 MCW-CFI unit installed
in the right rear corner of the transmitter.  These transmitters
will lack characteristics 1 and 2 listed above for the T-47A.  The 8Q-1
MCW-CFI unit uses two tubes, but the 200 kHz crystal unit can be
mistaken for a third tube.

***This version needs a cal book for the "AN/ART-13" or the "ATC-*"
with 8Q-1 MCW-CFI.***

NOTE:  I doubt the existence of any T-412/ART-13B that retained the
8Q-1.  Supposedly, all base transmitters were to be upgraded to
T-47A condition, but this obviously seldom happened unless the
base transmitter was already a T-47A.  Many T-412 transmitters lack
the most important changes that distinguish the T-47A from earlier
models, i.e., items 1 and 2 above.

Cal Book Characteristics

A.  AN/ART-13A
1.  Cal data are provided at 1 kHz intervals throughout entire range
    of 200 to 600 kHz and 2000 to 18100 kHz.  This precision of the
    MF/HF settings is aided by the vernier scale on VFO dial B.
2.  LF/MF data are provided ONLY from 200 to 600 kHz, the tuning range
    of the O-17/ART-13A.

B.  AN/ART-13 with 8Q-2, or ATC-* with 8Q-2 
1.  Cal data are provided at: 
     200 to   500 kHz -  2 kHz intervals
     500 to  1500 kHz -  5 kHz intervals
    2000 to  8000 kHz -  5 kHz intervals
    8000 to 18100 kHz - 10 kHz intervals
2.  LF/MF data are provided from 200 to 1500 kHz, the tuning range
    of the O-16/ART-13 or the unit without nomenclature for the ATC-*.
3.  All calibration points shown in bold are some multiple of 50 kHz.
    EXAMPLE:  4000, 4200, 4400, 4600 etc.

C.  AN/ART-13 with 8Q-1, or ATC-* with 8Q-1 
1.  Cal data are provided at: 
     200 to   500 kHz -  2 kHz intervals
     500 to  1500 kHz -  5 kHz intervals
    2000 to  8000 kHz -  5 kHz intervals
    8000 to 18100 kHz - 10 kHz intervals
2.  LF/MF data are provided from 200 to 1500 kHz, the tuning range
    of the O-16/ART-13 or the unit without nomenclature for the ATC-*.
3.  All calibration points shown in bold are some multiple of 50 kHz,
    plus some multiple of 66.5 kHz.
    EXAMPLE:  4000, 4200, 4267, 4400, 4533, 4600 etc.

There are at least four editions of the cal book for the ATC-* with 8Q1.
There are at least two editions of the cal book for the AN/ART-13 with 8Q2.

A cal book for the AN/ART-13A would work fine for any of the earlier models.
However, it will be hard to set VFO dial B to the precision specified, since
the dial B vernier scale is not available (without M2 modification).

You indicated that the base transmitter upon which your T-412 is built
is USN, but the following needs to be known as well:
1.  Does it have the vernier scale above VFO dial B?
2.  Which MCW-CFI unit does it have (two tube 8Q-1, or three-tube 8Q-2)?

The most likely answers will be 1. No, and 2. 8Q-2.  In that case, get a
cal book as described in version B above.  Unfortunately, any cal book is
going to be hard to find...ebay likely presents (rarely) the best
possibilities since Fair Radio sold the few that they had 15 years ago.

FWIW, the TCZ had the 8Q-1 MCW-CFI unit, but I've seen photos of TCZ-1
units that had the 8Q-2.  Those would need cal books as described above
for version C or version B, respectively.  A TDZ-* cal book could be
used with the T-412/ART-13B depending on the 8Q-1/8Q-2 status of both
the book and the transmitter, and the presence of the dial B vernier
on the transmitter.

I do not own a cal book for the TCZ, TCZ-1, or TCZ-2, all made by Collins.
If anyone has such, I'd be interested in its "Edition Number", and if the
cal data was for the 8Q-1 (Example shown in C.3 above) or the 8Q-2 (Example
shown in B.3 above).

Synchronization Check Crank

I know that the maintenance manuals refer to a crank for the autotune
synchronization check by saying it "is included in the spare parts",
I've never seen even a picture of one.

73,
Mike / KK5F