[Premium-Rx] Racal 1772/78 receivers

[Thomas Adams]

Yep, there's always the converter route.

On my diversity setup, I was lucky enough to get hold of an MS-561-2 
to convert the 1400 KHz
to 100 KHz for the input of the MA-168 diversity combiner.

building a convertor with a Minicircuits mixer and a crystal 
oscillator isn't that big a deal, but I
rather suspect that most users wouldn't want to go to that much effort.


73's,

Mr. T.    W9LBB


At 16:12 12-08-10, Michael O'Beirne wrote:

>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.
>
>