IMPEDANCE MEASUREMENT OF CHOKE BALUN



Material :
WURTH 74270191 4W620 µ=820

  FARNELL Ref  1635642 < 5 €

  Choke : 13 turns, the turns number of RG223     that fits the core.

Zl = 2 * R_gén * ((10 ^Att/20)-1)             R_gén = 50 Ω

Formulae :

http://www.cliftonlaboratories.com/Documents/Assembly%20and%20Usage%20Notes%20for%20Crystal%20Test%20Fixture.pdf

Results :

Frequency		Attenuation dB	Z (kΩ)
2	MHz	31,38	3,61
3,6	MHz	35,92	6,15
7	MHz	38,88	8,69
14	MHz	42,24	12,84
28	MHz	46,4	20,79
50	MHz	49,44	29,55

The choke :