Toroid FT-340-43 for broadband and EMI filters

• Material:
  43
• Permeability (µ_i):
  800
• A_L (nH):
  1000
• Outer diameter (metric):
  85.7 mm
• Inner diameter (metric):
  55.5 mm
• Height (metric):
  13.5 mm
• Outer diameter (imperial) :
  3.374 in
• Inner diameter (imperial):
  2.185 in
• Height (imperial):
  0.531 in

Toroid FT-340-43 for broadband and EMI filters

Suitable for HF high power balun up to 2 kW.

Example application of a 1:1 Balun 1:1 on HF band

Frequency (MHz)	Impedance (Ohm)	1m RG400 or RG142 (6+6 turns) the second turn is reversed (tested with HP 4191A impedance analyzer)
1.5	1700
3.0	4300
10	3100
20	1260
28	900

This toroidal ferrite core, thanks to its generous dimensions, is also suitable for winding of large diameter cables like RG8 and RG213

Note: we remind that for the proper operation of a 1: 1 Balun it is required an impedance of at least 500 Ohms (preferably 1000), this gives the possibility to obtain a good symmetrization of the coaxial cable on a balanced load

Frequency range by application:
- EMI/RFI suppression: 25 - 300 MHz
- Inductive: <10 MHz
- Power magnetics: -