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Old Mar 14, 2011, 10:01 AM
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Joined Mar 2011
13 Posts
Low Pass Filter or High Pass Filter?

I have a 900 mhz video tx and 72 mhz rc link. Video tx is causing interference for rc link. I'm taking other precautions to deal with the other interference, but would a low pass filter do anything to help? Or would it make no difference because a low pass filter attenuates everything after 900 mhz?
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Old Mar 14, 2011, 11:37 AM
Honey Badger
Blue Chip's Avatar
United States, FL
Joined Oct 2005
1,814 Posts
I flew that system for a while. Spacing of components should solve it.
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Old Mar 14, 2011, 03:20 PM
Postcards From The Purple Edge
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United States, OK, Sand Springs
Joined May 2007
3,919 Posts
You would need a high pass filter to protect your 72MHz gear if compnoent placement doesn't fix it.

Those filters are named based on what they allow to get through (or let "pass"). Thus "low pass" lets through the tuned frequency and below, while "high pass" lets through the tuned frequency and above. A notch filter might be another option which is sort of a combination of the two.

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