[hpsdr] calibration - noisefloor

[Phil Harman]

Joe,

Thanks for the detailed explanation - that is exactly what happens.


> Once you understand this philosophy it makes logical sense and is a
> quite valid approach.  It's not, however, how I would've done it
> personally, hihi, but that's irrelevant.
>

Well I didn't want to do it that way either!  The initial plan was to
switch the preamp in/out of circuit using a relay.  Lyle re-layed the PCB
three times from memory but we could not get an acceptably low spur level.

The current method does degrade the BDR by a small amount but the end
result is still pretty good.

So if you want to re-label the preamp on/off to reflect what actually
happens....go ahead....make my day!

73 Phil...VK6APH



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