To calibrate a transceiver, RF control filters, adjust the antennas, to know the number of harmonics generated by an oscillator, evaluate potential pollution HF, etc.., a spectrum analyzer, the only instrument able to view the screen a high frequency signal whatever is needed. Since the cost in trade, such a device is prohibitive for the award of an amateur, even enlightened, we have "table "to the realization that we propose here and whose price / performance is that excellent
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