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LOW PASS FILTER FOR 630M BAND

630m band (472kHz-479kHz) Low Pass Filter. Under development


Under development

Common Low Pass Filter

 

Additional Low Pass Filter that is common to both the transmit board and receiver board. 

Fig 2 Schematic of the external low pass filter stage. This circuit is subject to further development.

 

C1 Capacitor 6n8n
C2 Capacitor - 13.6nF = (10n 2kV + 3n3 2kv)
C3 Capacitor 6.8nF = (2000pF 3kV + 200pF 3kV)
L1 Single layer, close wound air inductor, 16uH, 38turns on a 25mm former. See air inductor design
L2 Single layer, close wound air inductor, 16uH, 38turns on a 25mm former. See air inductor design

 

 

Fig 3 AADE Filter Design 4.5 attenuation analysis of the common low pass filter circuit.

 Fig 4 AADE Filter Design 4.5 attenuation analysis of the common low pass filter circuit.

 

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Page last revised 25 July, 2014  
 

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