[Milsurplus] Hosstraders Fall 2005 hamfest report (Long)

[Mike Morrow]

Todd wrote:

>ART-13 ... Represented as a -13A, possibly because of the LF osc?

Nope.  No relation at all.

As I posted last week, the USAAF/USAF T-47A/ART-13 has a vernier scale on VFO dial B that allows setting it in tenths of a division, and a power interlock switch that activates when the top cover is removed.  The USN T-47/ART-13 or ATC do not have these easily observable characteristics.  Plus, an T-47A/ART-13 will say that on the nomenclature tag on the right side, which is usually in a typical Army Signal Corp layout that normally includes British unit nomenclature on it too.  The T-47A uses a different calibration book than the T-47 does.

The LF oscillator that should be in a T-47A/ART-13 is the O-17/ART-13A, which only covers 200 to 600 kc in three bands.  The LF oscillator that should be in a T-47/ART-13 is the O-16/ART-13, which covers 200 to 1500 kc in six bands.  Thus the number of positions on the band switch of the LF oscillator is a dead give-away to which LF oscillator is installed, even when seen from across the room.

Mike / KK5F