[Milsurplus] Fwd: Re: Mystery Navy? SSB receiver with AFC

[Bruce Gentry]

-------- Original Message --------
Subject: 	Re: [Milsurplus] Mystery Navy? SSB receiver with AFC
Date: 	Fri, 09 May 2014 21:52:07 -0400
From: 	Bruce Gentry <ka2ivy at verizon.net>
To: 	Nick England <navy.radio at gmail.com>



Could it be General Electric?   They tried to break into SSB with a
receiver using a Costas Loop circuit supposedly as easy to tune as an
ordinary AM receiver. Aside from a 300-3000 cycle audio response, it was
supposed to sound just like AM.  For whatever reason, it didn't catch
on,  like so many other great ideas that emerged from Electronics Park -
the "World's Center for Electronics Progress"-  here in Syracuse.
Bruce Gentry, KA2IVY

On 5/9/14 9:16 PM, Nick England wrote:
>  Today I got a batch of 1950's Navy radio schematics (originals and large
>  size blueprint copies) off eBay.
>  One of these large size ones says "Typical SSB Receiver" but is obviously
>  drawn after some real piece of equipment.
>  Dual conversion SSB receiver with motor drive AFC driven from suppressed
>  carrier.
>  But I'll be danged if it is one I recognize - anyone? anyone?
>
>  Here's the lineup:
>  10-30  MC input
>  variable atten network ("20 steps of 40dB attenuation")
>  RF amp
>  pentagrid mixer<-- HF OSC (6.9-26.9 mc)
>  lattice filter (3.1 mc)
>  MF amp
>  MF bal mixer (2 triodes)<-- 3mc xtal osc in oven
>  splits to two 100 kc channels
>
>  Channel 1 (100 kc)
>  var attenuator (SB level control)
>  LF amp
>  USB/LSB filter
>  LF amp
>  LF amp
>  LF bal mixer<-- 100 kc XTAL REF OSC or exalted carrier (see below)
>  audio out
>
>  Channel 2 (100 kc)
>  carrier amp
>  carrier amp
>  4 section carrier filter
>  carrier amp
>  exalted carrier amp - (also feeds LF balanced mixer - see above)
>  AFC motor drive quadrature balanced modulator circuit
>
>  XTAL REF OSC  feeds other quadrature of AFC motor drive balanced modulator
>  circuit
>
>  AFC motor shaft controls trimmer cap in HF OSC
>
>  There is a switch to drive the AFC motor from AC line to reset/center it.
>
>  There are dashed lines implying 3 physical sections?
>  1) RF, MF, LF, AF
>  2) HF OSC, MF Osc, AVC, Carrier amp
>  3) XTAL REF OSC  and AFC motor circuits (shaft link to section 2)
>
>  Does this ring any bells?
>    Nick England K4NYW
>  www.navy-radio.com
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