Friday, August 31, 2018

RF Noise Antenna System

RF Noise Antenna System.

Block Diagram of RF Noise Antenna System
The Live System can be accedes here http://rfnoise.amsatsa.org.za/

I Developed a rf noise monitoring system and there was a need to standardize on an active antenna for the system.

My thinking was sins most Remote Stations is Raspberry Pi with RTL-SDR dongles I felt developing a front end power injector with Galvanic isolation from active antenna with the necessary RF filters.
I also had a requirement to resolve the rtl-sdr dongle front end filter problem.
There is an Rf image on center frequency 14.2 Mhz.
I then Developed a Low and High band pass filters on the same PI HAT that can be switched via IO pins on Pi.

Here is the circuit diagram of my design with out the Active Antenna.


Raspberry Pi HAT with Filters,Isolation and Power injection

Filter design details. 

High Pass Filter

Low Pass Filter

I will work on an active Antenna board.

3d view of Board


ref :http://rfnoise.amsatsa.org.za/