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RFbeam Microwave GmbH | Schuppisstrasse 7 | CH-9016 St. Gallen | www.rfbeam.ch | K-LD2 | data sheet

09/2018 - Revision B | Page 12/20

FFT filter

The FFT filter feature can be used to filter out specific

regions in the FFT spectrum. The FFT filter array (see

parameters A20…A27) consists of up to 8 indepen-

dent FFT filters. Further the ± width around these FFT

filters can be specified with the parameter D08.

For example: The commands

$A2000A<CR>,

$A210032<CR>  &  $A220050<CR> define 3 FFT fil-

ters at the bin positions 10, 50 & 80. The command

$D0802<CR> sets the ± width around the filters to 2.

This feature allows easy filtering out of un-

wanted constant movements like a ventilator.

Please note that other movements with the

same speed are also filtered out.

Figure 12: FFT filter and FFT filter width example