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

[peter A Markavage]

This might help; from the National, QSL.net archives. I also saw some
other references there, so you might want to check them all out::
From: Albert Santangelo <ve3ajm at sympatico.ca>
Date: Fri, 06 Jul 2001 08:23:20 -0400
Subject: [National] Northern Radio-National NC-183D Dual Diversity Rcvr.
Message-ID: <3B45ADB8.16296C8C at sympatico.ca>



Hello all,
Still looking for a schematic diagram for this Northern Radio Type 141,
modified dual diversity NC-183D receiver.
Thanks
Al
------------
Also, I believe there was a writeup with pictures several years ago in
Electric Radio.
Pete, wa2cwa


On Mon, 4 Oct 2004 12:19:35 -0400 flood at Krohne.com writes:
> 
> 
> 
> 
> 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