Temporary fix

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All,

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Based on some thoughts delivered by this thread I have found a temporary fix, but it is really only that:

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-????????? Set SA working

-????????? Inject known power into Ant port

-????????? Set to 1dB/div and establish the error (needs the precision of being on 1dB/div)

-????????? Go to RF Analysis screen

-????????? Inject known power into main port and establish that error

-????????? Go into CONFIG screen

-????????? Set port offsets ‘ON’

-????????? Set those error offsets in the Ant port and Main port windows, to 2 decimal places

-????????? Save these settings to internal non-volatile memory as a pre-set by a useful name. I use ‘CALFIX’

-????????? As the CONFIG screen port offsets do not survive power reset, on first turning the instrument on, recall ‘CALFIX’

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The instrument is now reading far more accurately on both Ant input dBm and the Power Meter, and these can all be done from the front panel.

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There remains another offset on SA accuracy from the Main RF port that can’t be removed without also affecting the Power Meter.

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But as I said, it’s not a particularly desirable or elegant solution, though I hope this is helpful to some

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Rgds

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Colin G4CWH/ZF2CA/M3E