+3

FT400-3I, ID=3", RFI Range 1-300 MHz

F400-31-1

$39.95

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Product Details

MPN: F400-31

RFI Range (MHz): 1-300 MHz

ID-B (in/mm): 3/76.2

OD-A (in/mm): 4/101.6

Height-C (in/mm): 1/25.4

Weight (oz/gm): 420 grams

Initial permeability: 1500

Case/Box lot size: 25

Frequency (MHz)/Single turn impedance (ohms): 1MHZ:14 ohms, 5 MHz: 31 ohms, 10 MHz: 45 ohms, 25 MHz: 76 ohms

(4″ OD, 3″ ID hole), available in mix 31 only

Excellent for large cables or multiple cables – use multiple cores for higher choking. Also useful when you need high turns count for high choking with large cable - works on AC or DC power lines and also coax cable lines.

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Also make sure you connect a good RF ground to the transceiver ground post.

Note to Flex Radio users:  Use snap on ferrites for firewire cable, speaker cable and mic cable,  Ring ferrites for Antenna output and DC power.

For additional RFI suppression, use a feed line choke at the antenna to suppress common current on the coax feed line – see our store for feed line choke alternatives for use at the antenna.

If you use a linear amplifier we have RFI kits for linear amplifiers that help suppress RFI in your shack or in your neighbor’s house.