[Premium-Rx] Sylvania R1451A

[Doxemf]

Bill and Al,


I wonder how much of the circuit is similar to the R-1414?
 The 1414 has the LO AFC lock derived from the nixie counter which is clocked by a separate 1mhz osc located below the display motherboard.

The 1414 also has multipole xtal roofing filters between the front end tuner and the first mixer. The first conversion circuit has 3 progressively higher frq's depending on the band, that are then converted down to 455.
Also independent SSB and diversity capable.

I have the manual for the 1414 and The Manual Man might still be able to offer a copy.

Bill, KB3DKS 

 

-----Original Message-----
From: Al Klase <ark at ar88.net>
To: premium-rx <premium-rx at mailman.qth.net>
Sent: Fri, Dec 28, 2012 12:39 pm
Subject: Re: [Premium-Rx] Sylvania R1451A


Bill,

Josh Rovero's site contains the basics. 
http://www.roveroresearch.info/home/boatanchor-radios/r-1451-1

What do you want to know?

I one owe of these, and have it running.  Architecturally it's sort of a 
solid-state Hammarlund SP-600 plus ceramic IF filters (by Clevite, no 
less) and independent-sideband capabilities.  The first local oscillator 
is tunable, and a Nixie-tube counter calculates and displays the 
frequency.  There is an AFC that can lock the LO to the low-order digit 
of the counter.

I have an internal interconnect diagram, but no module schematics.

Al

On 12/27/2012 10:43 PM, Bill Tweedie wrote:
> Hi All
> Can anyone shed any light on this receiver?
> There are several references on the web but no detail.
> Bill