MATERIAL 34 (Permeabilität 830)
Ein Nickel-Zink Material mit großem Volumenwiderstand. Wird häufig für Spulen mittlerer Frequenz in Ringform und für Breitbandübertrager bis 50 MHz benutzt. Wird als Ferritperle besonders zur Dämpfung unerwünschter Oberwellen im Bereich von 50 bis 200 MHz eingesetzt. Frequenz hohe Güte 40 MHz bis 400 MHz.
Mantelwellensperre bis 50 MHz - 12 Windungen RG 141 auf einem FT240-34. Für QRP reicht auch dünneres Kabel und ein FT 140-34 Kern aus.Soll auch 160 m abgedeckt werden wird es etwas schwierig mit 34 Material besser ist ein FT240-16.
Features
NiZn ferrite with a range of 20 to 250 MHz for suppression of conducted EMI, that is used for inductive applications (ex: high frequency common-mode chokes) Frequency high quality 40 MHz to 400 MHz.
Sheath wave barrier up to 50 MHz - 12 turns RG 141 on one FT240-34. For QRP also thinner cable and a FT 140-34 core is sufficient. Should also be covered 160 m it will be a bit difficult with 34 material better is a FT240-16.
Burnished to break sharp edges, can contain Parylene C coat at smaller diameters from length 9.5mm (0.375") or a uniform coating of thermo-set plastic for larger dimension (if part numbers ends with a C).
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34 Material Characteristics |
|
Property |
Unit |
Symbol |
Value |
Max.
Permeabilität |
Freq. MHz Resonanz |
Freq. MHz Breitband |
Freq. MHz Drossel |
|
Initial Permeability@ B < 10 gauss |
|
µi |
830 |
3000 |
0.01-1 |
1-50 |
30-600 |
|
Flux Density @ Field Strength |
Gauss
Oersted |
B
H |
2900
10 |
Mittlere Feld-
Linienlänge
8.9 cm |
Oberfläche
0,79 cm² |
Volumen
7 cm³ |
|
Residual Flux Density |
Gauss |
Br |
1300 |
|
|
|
|
Coercive Force |
Oersted |
|
0.45 |
|
Vol.Widerstand Ω/cm
N/A |
|
Loss Factor @ Frequency |
10 -6
MHz |
Tan δ/ µi |
250
1.0 |
Remanenzflußdichte
10 Oe (Gauß)
|
Σl/A(cm-1)
10.7 |
|
Temperature Coefficient of Initial Permeability
(20 -70°C) |
%/°C |
|
1.25 |
Density gm/cm3
≈4.7 g/cm3 |
|
Curie Temperature |
°C |
Tc |
>130 |
|
Resistivity |
Ohm-cm |
Ρ
|
1×105 |
|
Electrical Specifications |
|
Bestellnr. |
Kern-Material |
Item |
Unit/Symbol |
Condition |
Value |
AL-Toleranz |
|
|
FT140-27 |
Ferrit Toroid |
AL |
nH/N2 |
@ 10 KHz |
885 |
±20% |
|
MnZn |
|
|
Le |
cm |
N/A |
8.9 |
±10% |
|
Ae |
cm² |
N/A |
0.79 |
±10% |
|
Vef |
cm³ |
N/A |
7 |
±10% |
|
Initial Permeability |
µ⁰ |
@ B < 10 gauss |
2030 |
±20% |
|
Temp. Coeff. Of initial
Permeability |
% °C |
20-70°C |
1.25 |
Typ. |
|
Coercive Force |
Hc |
oersted |
0.45 |
Typ. |
|
Residual Flux Density |
Gauss, Br |
N/A |
1300 |
Typ. |
|
Flux Density |
Gauss, B |
Initial (B), oersted |
2900 |
Typ. |
|
|
Gauss, H @ |
@ Field Strength (H), oersted |
10 |
Typ. |
|
Curie temperature |
°C |
Tc |
> 130 |
Nom. |
|
Resistivity |
Ω cm. p |
@ Field Strength |
1×105 |
Typ. |
|
Loss Factor |
106Tan δ/ µi |
Initial |
15 |
Typ. |
|
|
MHz |
@ Frequency |
0.1 |
Typ. |
|
Chart Legend |
|
Σl/A : |
le : |
Ae : |
Ve : |
AL : |
|
|
Core Constant |
Effective Path Length |
Effective Cross-Sectional |
Effective Core Volume |
Inductance Factor
|
|
|
11.2 |
8.9 |
0.79 |
7 |
885 |
|
Dimensional Tolerances |
|
Case |
In |
Toleranz |
mm |
Toleranz |
Weight |
Gewicht |
|
B (Outer Diameter)/mm |
1.4 |
±0.030 |
35.55 |
±0.75 |
33.00g |
33.00 gramm |
|
A (Inner Diameter)/mm |
0.9 |
±0.022 |
23 |
±0.55 |
--- |
--- |
|
H (Height)/mm |
0.5 |
±0.020 |
12.7 |
±0.50 |
--- |
-- |
|
Ferrite Material Constants |
|
Specific Heat |
0.25 cal/g/°C |
|
Thermal Conductivity |
3.5 - 4.5 mW/cm-°C |
|
Coefficient of Linear Expansion |
8 - 10x10-6/°C |
|
Tensile Strength |
4.9 kgf/mm2 |
|
Compressive Strength |
42 kgf/mm2 |
|
Young's Modulus |
15x103 kgf/mm2 |
|
Hardness (Knoop) |
650 |
|
Specific Gravity |
≈4.7 g/cm3 |
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Die oben genannten Eigenschaften sind typisch für Amidon MnZn- und NiZn-Ferrite.
The above quoted properties are typical for Amidon MnZn and NiZn ferrites. |
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