[Milsurplus] Mystery Navy? SSB receiver with AFC

[Sheldon Daitch]

Nick, 

bits and pieces of the below sound like the RCA SSB-R3 receiving system and a bit like the CV-157 demodulator.

But that is about as far as I can pin it down.

73
Sheldon

-----Original Message-----
From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Nick England
Sent: Saturday, May 10, 2014 4:16 AM
To: Military Surplus Mail List
Subject: [Milsurplus] Mystery Navy? SSB receiver with AFC

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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