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Ferrite install on antenna coax entering radio

Danny37

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Feb 23, 2013
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I'm trying to lower the noise coming in through the antenna on a mobile install. Does either orientation matter when snapping on a ferrite core on the end of the antenna coax going into the radio?

(Example shown is of a usb cable not a RF coax)
 

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Danny37

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For a particular ferrite mix there will be a specific number of turns needed to target a frequency range and your first picture is typical of how it’s done. Are you working with HF or VHF/UHF?
UHF, more specifically, GMRS and the lower end of T-band. How many turns would work?
 

prcguy

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So Cal - Richardson, TX - Tewksbury, MA
UHF, more specifically, GMRS and the lower end of T-band. How many turns would work?
I‘ve never come across a need for ferrites on a UHF mobile install, there is not much inside a car that will generate RFI at UHF and anything that might be a problem would just get picked up by the antenna. Otherwise for VHF/UHF usually three to four #43 mix or Laird 28 mix snap on ferrite beads in series over the cable does a good job.
 

merlin

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For noise, you really need an iron powder toroid or clamp on type. UHF/GMRS, I have never had the need. Low band down through HF it become more necesseary. That is where the noise comes in through the antenna and you have to live with that.
For common mode rejection, then the #43 mix ferrite as prcguy suggest will work.
 

Danny37

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Feb 23, 2013
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Thanks guys. Very informative to know for future installs as well. Plan on installing a vhf rig in my brother's car
 

VK6NCB

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Jan 21, 2024
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10
I‘ve never come across a need for ferrites on a UHF mobile install, there is not much inside a car that will generate RFI at UHF and anything that might be a problem would just get picked up by the antenna. Otherwise for VHF/UHF usually three to four #43 mix or Laird 28 mix snap on ferrite beads in series over the cable does a good job.
here in Australia cheap LED spotlight drivers will wipe out UHF CB comms.
I have good LED headlamps which cause no issues, and a cheap work light wired as a reverse light with a 9-36V driver that wipes out everything from FM broadcast to UHF CB (477MHz) for a couple of metres around the car
 
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