Eugen_E
Joined: 29 Nov 2004
Posts: 323
Helped: 30
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 13 Jul 2008 22:21 Spectrum analyzer - reducing bandwidth |
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Inspired by this: http://www.circellar.com/library/print/0406/Armitage-189/
I decided to try to design a simple homemade spectrum analyzer, based on TI/Chipcon CC1100.
The SA will use the reading of RSSI from CC1100, covering 800-928MHz, and an input mixer to convert an input spectrum of 1-128MHz to 800-928MHz.
The advantage is a very simple circuit and the RSSI value is quite accurate compared to conventional log detectors.
The problem - the minimum configurable bandwidth (RBW) for CC1100 is 58kHz, which is very high.
An SA with such RBW could be used for real measurements?
Do you know a method to reduce the RBW in software by taking many measurements at small frequency steps and doing some kind of "digital filtering" of the RSSI values?
Thanks
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