Table of Contents
Advertisement
frequency span and change the dectection method to "Sample" to mitigate
this confusion.
Due to the wide frequency coverage, in order to avoid the receiver's
overload caused by the total energy of external signals and improve the anti-
interference performance, there are several pre-selectors in the front end of
KC908. The pre-selector segmentation methods of the two ports are different,
and the anti-interference performance of the two ports in different frequency
bands will vary. The specific technique will be described later. Although a large
part of RF circuits' proportion are preselectors, they can only perform rather
preliminary filtering due to the size of the instrument. Therefore, if it is used in
complex interference environment, some external filters should be used.
Digital signal processing is implemented by FPGA and MCU. While
demodulating the signal, FPGA converts the digital IQ signal again for strict
filtering. The demodulation bandwidth of KC908 is from 150Hz to 300kHz,
which is suitable for most private network signal analysis. If wider
demodulation bandwidth is needed, USB3.0 can be used to transmit the
original digital IQ signal to the computer, and the third-party software (such
as GNUradio) can be used for processing. The bandwidth of IQ signal can up
to 40MHz.
1.2 Basic Function
1. Spectrum analysis
Advertisement
Table of Contents
