noch filter

[parisa.l]

hello all
i'm working on a sharp filter for 187KHZ and 230KHZ frequency with a not high Q (10-15) i thoght maybe a notch filter would be the best.... is there anyone that can help me with this circuit design? or is there any circuit suggested for this design?

 

[Nigel Goodwin]

Are you wanting two seperate notches?, or just a bandwidth filter 43KHz wide?.

I would suggest you buy a copy of either the ARRL or RSGB handbooks - essential reading for almost everyone on these forums!.

 

[parisa.l]

actually it is 2 seperate notchs
is there anywhereelse to get more info?

 

[ericgibbs]

actually it is 2 seperate notchs
is there anywhereelse to get more info?

hi,

Look here:
https://www.analog.com/library/anal...PtA.pdf&fterm=notch&fterm=filters&fterm=notch filters&la=en

Also goto www.analog.com and search for notch filters... njoy

Lotsa circuits too!
https://www.analog.com/library/anal...notch&fterm=filter&fterm=circuits&fterm=notch filter circuits&la=en

 

[Nigel Goodwin]

Either of those books would help you - but essentially just series resonant circuits are what you need. To calculate them use:

F = 1/(2 x PI x Square Root (L x C))

What are you trying to do though?.

 

[parisa.l]

thanx alot eric the informations were exactly what i wanted to know

nigel thanx for ur attention... it's a simple sender and reciever but it should be very sharp on these frequencys and i didn't know anything about filters)
anyway thanx
Parisa