[Boatanchors] Mystery National Receiver, NC-127D

[WA5CAB at cs.com]

Bob & Group,

I have a manual here that came out of the National plant after they went out 
of business (the front cover is stamped "File Copy").  Title is "Instruction 
Manual for Experimental Model NC-127D Diversity Receiving Equipment".  The 
manual is pretty thin and doesn't exactly match your radio as neither the 
schematic nor the line drawing of the front panel show an S-meter.  No date that I can 
find.  The receiver covered by this manual is single-conversion and uses 
double-ended tubes in the RF's, mixer and IF's (6K7's, 6J7 and 6K7's).  6J5 HFO.  
6V6 output.  The Diversity Gain pot controls the 1st IF and the text says that 
it is for balancing the gains of multiple receivers.

And BTW, it's "haze gray".  Hence the sailor's lament, "haze gray and under 
way".  :-)

In a message dated 6/29/2004 10:21:42 AM Central Daylight Time, 
robert.kerr at gtri.gatech.edu writes: 
> I have an interesting old National receiver with no documentation, 
> labeled model number NC-127D.  It appears very similar to the NC-101XA, 
> but it's painted battleship gray and has a rack mount front panel with 
> handles.  There are more control knobs on the front panel than the 
> -101XA, and the S-meter is located at the upper left corner of the front 
> panel, rather than behind the near left side of the tuning dial 
> escutcheon as in the -101XA.  It tunes from 540 kHz to 30 MHz.  The 
> knobs are an off white color.
> 
> A tag on the front says "Order number 2507" and gives a manufacturing 
> date of 6-1-45.  The serial number is "1".  I have it from the former 
> owner that the "D" stands for diversity, and that it was designed to be 
> part of a diversity reception system employing at least one other 
> receiver like it.  There is a coax connection on the back for 
> import/export of the local oscillator signal, but unfortunately I have 
> only one radio.
> 
> Does anyone out there know anything about this radio?

73
Robert Downs - Houston
<http://www.wa5cab.com> (Web Store)
<wa5cab at cs.com> (Primary email)
<wa5cab at houston.rr.com> (Backup email)