# Do I Need A Filter?

**URL:** <https://discussions.flightaware.com/t/do-i-need-a-filter/27833>\
**Category:** ADS-B Flight Tracking\
**Created:** [November 9, 2017, 6:31pm UTC](https://discussions.flightaware.com/t/do-i-need-a-filter/27833 "2017-11-09T18:31:05Z")\
**Posts on this page:** 1\
**Showing post:** 745

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**Author:** ![triggers](https://sea1.discourse-cdn.com/flex019/user_avatar/discussions.flightaware.com/triggers/32/117248_2.png) [@triggers](https://discussions.flightaware.com/u/triggers)\
**Post date:** [July 20, 2020, 7:28am UTC](https://discussions.flightaware.com/t/do-i-need-a-filter/27833/745 "2020-07-20T07:28:39Z")

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@pretoescuro Great build 😄

I had a go at a 3 pole filter a couple of years ago. Here is the link [Interdigital](https://discussions.flightaware.com/t/roll-your-own-interdigital-filter/28043/18)

I’ve compared your filter scan with mine and they are very similar. Mine is the top scan.

 ![Compare](https://us1.discourse-cdn.com/flex019/uploads/flightaware/original/3X/5/a/5a6cfd5218fc2a7344b44f37978efe8b01b90467.jpeg)

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