RTL SDR BA5SBA, Руководство по установке

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signal receiving HF band needs to meet the HF Antennas such as Long Wire, Random Wire, Dipole etc.. To have
a good effect need matching antenna.
How to set the Gain
The gain can be adjusted in SDR# by clicking on the Configure button
which looks like a cog. When tuning the RF gain you are trying to get the
signal as strong as possible, whilst keeping the noise floor as low as
possible. Start with a low gain setting, and slowly increase the gain slider.
Watch in the frequency spectrum as the signal strength increases, but stop
just before the point at which the noise floor starts to rise.
The noise floor is the part of the frequency spectrum where there are no
signals.