FT140-43, ID=.9", OD=1.4", RFI Range 25-300 MHz

Name: FT140-43, ID=.9", OD=1.4", RFI Range 25-300 MHz
SKU: F140-43
Price: 3.89 USD
Availability: InStock

Store/Ferrite Core Products/Mix 43/Ring - Mix 43 RFI Range: 25-300 MHz

SKU F140-43

$3.89

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FT140-43, ID=.9", OD=1.4", RFI Range 25-300 MHz

Store/Ferrite Core Products/Mix 43/Ring - Mix 43 RFI Range: 25-300 MHz

Product Details

RFI Range (MHz): 20-250 Mhz

ID-B (in/mm): .9/23

OD-A (in/mm): 1.4/35.6

Height-C (in/mm): .5/12.7

Weight (oz/gm): 33 grams

Initial permeability: 850

A(L): 1060

Frequency (MHz)/Single turn impedance (ohms): 25MHz:38 ohms, 100 MHz:80 ohms

Ferrite Ring Toroid Core, ID = .9"/23mm, Mix 43

Excellent for impedance transformers like 2:1, 4;1, 9:1 or use our convenient Balun/Unun DIY kits with all the parts needed.

When considering solutions for AM broadcast (550 Khz – 1.8 Mhz) you should consider Mix 77 ferrites available in a variety of shapes and sizes. Choose a size to give the maximum number of turns of the affected wire or cable.

AM broadcast transmits on a low frequency with large antennas. Consequently it takes a large antenna to receive the signals. Typical “antennas” are AC house wiring, phone lines, long satellite or cable TV cables, DSL/CAT5 lines running between rooms, etc. The device wires that connect to these “antennas” need to be choked with as many turns through the ferrite as possible. Some installation examples are shown below on this page.

For AC/ DC power cords and coax cables the F240-77 (2.4″ OD, 1.4″ ID) “Donut” toroid is the most popular. Also available are smaller toroid donuts and Mix 77 beads. Shown below is a graph with 8, 10, and 12 turns through the toroid – obviously more turns has higher choking impedance. Mix 77 toroid products are HERE and Mix 77 small beads (for small wires) are HERE

F240 77 Turns Comparison 1024x648 - AM Broadcast RFI Kits

F240-77 Turns Comparison from .1 – 8.1 Mhz

Shown below is a graph of frequency response verses choking magnitude for a F240-77 in the AM Broadcast band for a 12 turn coil around the toroid. (Same info as above but different frequency range).