[Milsurplus] National NC-183D(R) Diversity version?

Mon Oct 4 13:39:24 EDT 2004

Hi John,

That sounds a lot like the NC-183NR that I have, except that mine is not a
double conversion receiver and has one additional front panel control for
varying the IF bandwidth.  Mine came from a Northern Radio diversity
receiving setup, based upon the scanned documents that one of the list
members (Sheldon Daitch) sent me several months ago.  I can forward the
document's pdf files to you if Sheldon doesn't have them any more.

73,

Clare Owens  N2RJB

                      flood at Krohne.com                                                                                                       
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                                                Subject:      [Milsurplus] National NC-183D(R) Diversity version?                            

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Greetings,

A rack mount NC-183D was one of the BA's that followed me home from the
Hosstraders flea in NH this weekend.  This is an odd one.  It has what
seems to be a "factory" diversity modification.  There are two additional
knobs on the front panel, one just to the right of the bandspread  that
selects an internal or external HFO and another just to the left of the
main tuning control for AFC with four positions, two for a local BFO with
slow and fast settings as well as slow and fast settings for a remote BFO.
The "Bandswitch" is different (from what I remember) and has four marked
positions 12-31MC, 4.4 - 12MC, 1.6 - 4.4MC, and BCST.  (The control
actually has six detents.)  The back panel has loads of "Extra" parts A
three position osc. selector, a local / div. (diversity?) toggle switch
,ext BFO and 1250KHZ OSC. inputs,  IF and Monitor outputs all located on
SO-239 connectors, as well as a LF gain pot..  All markings on the front
panel (mil. gray) are engraved or stamped, filled with white.  There are
four small holes in the upper left of the front panel most likely for a
(missing) data tag.  It is functional and on frequency as best as I can
tell using known stations as a reference.  The strange thing, is that it
has the "normal" NC183-D main and Ham band, bandspread dials.  The general
thought at the flea (by those of us looking at it being shell shocked from
lack of sleep and lighter wallets) was that perhaps it may be a prototype
for a military project.  Can anyone on the list help me with more info on
this beast.  Or perhaps it is common and I have lead a sheltered life.  I
hope to have some digital photos available later today for those
interested.

John Flood KB1FQG
TASC Department
KROHNE, Inc
7 Dearborn Rd.
Peabody, MA   01960
Tel.:  978-535-6060 / 800-356-9464
Fax:   978-535-8180

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