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LF: <Tech>RA1792 IF out

To: [email protected]
Subject: LF: <Tech>RA1792 IF out
From: "James Moritz" <[email protected]>
Date: Mon, 6 Aug 2001 15:56:23 +0000
Organization: University of Hertfordshire
Reply-to: [email protected]
Sender: <[email protected]>
Dear Brian, LF group,

My RA1792 also has a 100kHz IF output; it is generated by a module that sits in the place intended for the ISB option. I have no documentation for this module - but I had a peek inside, and it appears to contain a mixer, LC filters, and a PLL conversion oscillator locked to the main reference oscillator, which mixes down the normal 455kHz output. I suppose it is intended to adapt the RA1792 to work with modems intended originally for receivers with 100kHz IFs like the RA17. I don't think it does anything special to the signal apart from shifting it in frequency. I don't suppose it would be a problem to disconnect it and use the original 455kHz output instead.
I have not had any problems with the RA1792 jumping from one
state to another - but I did have a similar problem with some
Marconi - Adret signal generators, which also appeared to be
caused by the back-up batteries going flat; the less often they were
used, the more often they would reset themselves at apparently
random intervals when they were switched on.
Cheers, Jim Moritz
73 de M0BMU

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