[Milsurplus] ATC - ART-13 LF Oscillators

Wed Aug 1 22:48:17 EDT 2007

Mike,
  Excellent summary,Mike. Keeping track of where the A's and B's go is 
the secret!
  There was a unit on the eplace recently that did not sell,but had a 
different "aftermarket" LF/xtal control HF module.There were probably 
several outfits competing in this market after WWII.

 190130910755

 is the item number,pictures still there.Check it out.
 Jay

-----Original Message-----
From: Mike Morrow <kk5f at earthlink.net>
To: Milsurplus at mailman.qth.net
Sent: Wed, 1 Aug 2007 4:03 pm
Subject: [Milsurplus] ATC - ART-13 LF Oscillators

>Now is this correct: did the Navy only really have the ATC/ART-13
>with the O-??? LF oscillator?

The USN ATC (COL-52286) utilizes a LF/MF oscillator (200 to 1500 kc in 
six
bands) that never had, to my knowledge, an official USN COL-52xxx 
component ID
assigned.

The USN AN/ART-13 (T-47/ART-13) utilizes the same LF/MF oscillator as 
the ATC,
with a JAN nomenclature of O-16/ART-13.

The USAAF/USAF AN/ART-13A (T-47A/ART-13) utilizes a similar LF/MF 
oscillator
(200 to 600 kc in three bands), with a JAN nomenclature of O-17/ART-13A.

The USAF early AN/ART-13B uses a T-47A/ART-13 with CDA-T LF/MF/HF 
crystal
control unit in place of the LF/MF oscillator.

The USAF later AN/ART-13B uses a T-412/ART-13B with CDA-T LF/MF/HF 
crystal
control unit in place of the LF/MF oscillator, and a LF (actually MF)
range-extend switch added to the front panel of the transmitter.

To use the full range of the O-16/ART-13, one of two external LF/MF 
tank
networks is required (CU-25/ART-13 for 200 to 600 kc, CU-26/ART-13 for 
500 to
1500 kc, usually with the SA-22/ART-13 antenna relay/switch box).

To use the O-17/ART-13A, an external LF/MF tank network is required. 
(The
CU-25/ART-13 with SA-22/ART-13 for 200 to 600 kc was used for early
installations. That was later replaced by the CU-32/ART-13A, which 
incorporates
larger reactive components and the the functions of the SA-22 all in 
one box
that is actually larger than the transmitter.)

It's interesting that AN/ART-13A manuals state that, using the standard 
LF/MF
aircraft trailing-wire antenna, typical power output at 200 kc is 4.0 
watts (!),
and only 14.5 watts at 500 kc.

The one USAF aircraft that I rode in 1970 that still had the AN/ARC-8 
installed
also had the LF/MF components. I've seen several photos of USAF 
AN/ARC-8
installations. Some had the LF/MF components, some did not. It appears 
that
the USAAF/USAF did indeed make use of the LF/MF coverage.

One of the nice things about the USAAF use of the AN/ARR-11 (BC-348) 
with the
AN/ART-13A (T-47A) to create the AN/ARC-8 is that receiver LF/MF 
coverage (200
to 500 kc) and MF/HF coverage (1500 to 18000 kc) very closely matches 
the
coverage of the transmitter with LF/MF oscillator installed (200 to 600 
kc, 2000
to 18100 kc).

Mike / KK5F

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