[Premium-Rx] Racal questions

[John Reed]

I have a Racal RA6793A here that was purchased new by a good friend of mine.  There are several puzzling things about it.  It has the LF option and non-standard roofing filters.  There was a 16 KHz bandwidth filter before the 40.455 MHz first IF amplifier, and an 8 KHz after.  This looked backwards to me.  I changed them around and the close in reception is now much better since that IF amplifier isn't looking at as much bandwidth.  Is this a mistake by Racal?  I can't think of any reason for it to be configured that way.  The other problem is the LSB filter wouldn't work.  It appears that the receiver was set up for ISB, which was not installed, so the LSB filter was left out of the loop.  That was easy to fix and now works fine.  I'm surprised Racal would send something out new in this shape.  After all when you pay over $10,000 for something it should work correctly.

John Reed
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