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carl9170 noise floor calculation

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We are developing a product that uses a board similar to the DLink
DWA-160. We are sticking an amplifier before the usb radios. I am
pumping beacons at say -80dBm from a siggen and a program reading the
radiotap header prints them out.

I am seeing ~20dBm gain which looks right, when taking into account my
PA and the one that looks to be on the actual USB cards.

Is there a way to use the pre-gain values for noise floor calculations,
and reporting of signal strength?

Manny
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