[Milsurplus] Mystery Navy? SSB receiver with AFC

[Nick England]

Thanks  I had heard of the R-3 but didn't know any details. Yeah the CV-157 similarity struck me too. I wonder if this was the prototype Hoffman rcvr? But that would be an odd choice for "typical". 
And 10-30 mc coverage. That seems strange too.  

Nick
(phone email acct)


On May 11, 2014, at 8:59 AM, Sheldon Daitch <SDAITCH at bbg.gov> wrote:

> 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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