[Premium-Rx] Racal 1772/78 receivers

[Michael O'Beirne]

Thomas

Although the RA1772 has a final IF of 1.4MHz, it should be possible to build 
an outboard crystal oscillator and mixer to convert to 455kHz, using perhaps 
an SBL-1 or a 1496 as the mixer.

Racal made several vaved converters to convert 100kHz to 455kHz and vice 
versa using the old 6AS6 gated mixer and I think a pentode oscillator.  I 
have here a highly complicated more modern converter (which looks distinctly 
ex-Admiralty) to do the same with a high level diode quad mixer, and so 
doing the same for 1.4MHz should be relatively straightforward.

73s
Michael
G8MOB
----- Original Message ----- 
From: "Thomas Adams" <quixote2 at ix.netcom.com>
To: "Williams, Barry" <Barry.Williams at nov.com>; <ufp at optusnet.com.au>; 
<quixote2 at ix.netcom.com>
Cc: <premium-rx at mailman.qth.net>
Sent: Wednesday, August 11, 2010 5:31 PM
Subject: Re: [Premium-Rx] Racal 1772/78 receivers


No good.

Last IF is 1400 KHz.