INDEX Page. 20 of 89
4.7 Predistortion
On the rear panel there is an SMA connector where the transmitted signal is attenuated
by 60 dB (50 ohms).
This signal can be used to connect an SDR transceiver with appropriate software in
order to improve the IMD of the transmitted signal by 25 dBc or higher (depending on
the software).
This result was obtained with a SDR transceiver currently present on the market.
An exceptional IMD of - 66dB has been obtained since in the EIA standard the
amplitude of the distortion products is referenced to the peak envelope power, which is
6 dB higher in power than the represented by one of the two tones.
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