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K7LMC

Joined: Tue, Mar 20th 2012, 17:26 Roles: N/A Moderates: N/A

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LC Pass Filters Mar 2nd 2016, 22:50 6 3,197 on 3/3/16

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LC Pass Filters K7LMC on 3/3/16
That's great. Thanks so much for the information. One final question. Does the same principal apply for using the caps in series also. For example if C1 in the circuit calls for 43.23pf parallel to ground, could I use 1 68pf and 1 120pf in series for a capacitance of 43.4pf?

I think, that's my last question, lol. Appreciate the help.

~Leonard, K7LMC
LC Pass Filters K7LMC on 2/3/16
Thanks for the feedback, Zack. One followup question... when using caps in parallel, will that work for the caps to ground, also?

~Leonard, K7LMC
LC Pass Filters K7LMC on 2/3/16
Hi, all. I'm working on a couple of homebrew antenna projects that require splitting the signals from 2 antennae to a single dual band radio.

1 one for LEO work on the 2m/70cm and the other for specialty Search and Rescue application on 2m/1.25m

When constructing the LC filter circuit, the value of the caps and inductors are always said to be of equal value. However, when using a 5 pole configuration for chebysev filters (which is best for the 2m/1.25m filter due to the bands being so close) the values of components are not equal.

And then, finding caps that match those values is impossible. So, my question is do I simply need to get close to the sum value of the component based on it being in series or parallel? e.g. I need to match the total capacitance of the circuit.

Or does the circuit need a specific capacitance at the specific location in the circuit?

Thanks for the help.

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