[TenTec] Orion 1 - ATU

[John Chance-Read]

I am having trouble with my MFJ Analyzer and am using the Orion ATU as a indication.  I have the latest downgrade 2.063Xg which provides a digital reading of VSWR (i.e.  4.8 : 1) on the top right of the screen display.  Can any advise on a rough accuracy of this reading.
Also at what point in the circuit is the spectrum display obtaining the readings - they are very lively and not sympathetic with the S Meter reading ?
Merry Xmas to you all
John G4BOU