[Milsurplus] 500 Kc XMTR

[Mike Morrow]

> Looking for something I can use on the new 630 Meter Band. 
> Tnx, Dick, W1KSZ

The T-47 (USN) or T-47A/ART-13 (USAAF) is a good candidate, using the optional LF/MF oscillator:

O-16/ART-13   200 to 1500 kHz in six   bands (USN)
O-17/ART-13A  200 to  600 kHz in three bands (USAAF)

But that alone will NOT put the transmitter on LF/MF, because it has NO LF/MF PA tank circuit.  That is in an external unit:

CU-25/ART-13   200 to  600 kHz (USN)
CU-26/ART-13   500 to 1500 kHz (USN)
CU-32/ART-13A  200 to  600 kHz (USAAF)

The best of these is the CU-32, but it is as large as the T-47A!

Don't forget the DY-12/ART-13 or DY-17A/ART-13A dynamotor.

The CU-32 and O-17/ART-13A are shown on the complete AN/ART-13A system schematic that Mike Hanz corrected and improved legibility from the defective copy found in original AN/ART-13A manuals:

 http://aafradio.org/docs/ART-13A_schematic.png

The receiver that the USAAF used was the AN/ARR-11 (a.k.a. the BC-348-Q or -R), which has a 200 to 500 kHz band.  Together, the AN/ARR-11 and the AN/ART-13A made the AN/ARC-8.

The USN used the ARB or R-23*/ARC-5 with their T-47.  The R-23*, BC-453-B, or ARA/nt-46129 190 to 550 kHz "command set" receivers should do a pretty good job.  Fifty years ago I kept a BC-453 on my favorite band of all time...the old 410 to 535 kHz MF Morse maritime band and it worked very well.

It'll be interesting, this new OLD band.  I just wonder how long it will take for hams to realize that 472 kHz is not even close to being LF...which runs 30 to 300 kHz.  Even a recent ARRL e-mail newsletter made that error.  But the other new band at 136 kHz...now that's right in the middle of the real LF band.  There's not much military surplus transmitting gear for that frequency.

Mike / KK5F