Ferrite to Eliminate noises & interferences

Hi,
I want to apply a ferrite to the bundle + and ? line.
Maximum load current is about 3Amps at 24V DC.

I can use both tubular or clamp-on but would like to use the best one. Which one will you recommend? The diameter of the cable is 5.7mm.

We want to add ferrite on Ethernet, serial and usb cable as well. What will you recommend. All the cable sizes are 5.7mm in diameter. Only the Ethernet cable is 7.6mm in diameter.

For the frequencies, Please read below :

We have performed a radiated emissions test requipment. Significant high radiated disturbances have been measured that exceed the Class A limit. Highest measured disturbances were (in vertical polarisation):
166.5MHz 13.6dB above Class A limit
99.6MHz 8.5dB above
40.9MHz 4.1dB above (broadband)
232.3MHz 3.6dB above
199.2MHz 2.1dB above (broadband)
53.0MHz 2.0dB above (broadband)
117.8MHz 1.3dB above (broadband)
33.3MHz 1.0dB above
107.0MHz 0.8dB above (broadband)
Broadband disturbances would be attributed to switching circuits (eg power supplies), narrowband with clock frequencies. Measurements were made with the AdaptMAC powered from a 24V linear power supply and with the MOXA box switched off.
Emissions do reduce when cables are disconnected from the equipment. However, with all cables removed except power. disturbances were still seen above the Class A limit, especially 166MHz. A ferrite with 2 turns on the power cable dropped this emission further but 232MHz was still just on the limit.





Can anyone recommend me anything from the http://australia.rs-online.com/web/ website?


Cheers