On output of RF power amplifier over 10MHz is LPF on it this filter big inductor T130 , question is from what material?
Color code is yellow / gray or clear see on Picture.
If color code is Yellow Gray is material #35
If color code is Yellow Cleary is material #6
In over 10MHz LPF I would expect RF material 6, but color code looks like Yellow Gray 35
How do you see it?
I removed one of the coils and measured it.
I merasure L=577nH Q=17.5 on 100kHz (measured with autobalance bridge 4 wire connection, error 2% max)
The coil has 7 threads see picture.
Al= 577/7^2=11.77
because coil is T130 and **broken link removed** **broken link removed**
it will be materila 6, but at 7 turns the coil should have only max (9.6+5%) *7^2=494nH
Can the winding method used have such an effect on coil induction?
Hi
Your calculated AL values are not matching to core AL value because of below reasons
1) Manufacturer measuring AL value with 100 Turns at 10KHz (you are measuring 7 turns at 100KHz)
Low turns should influence inductance because of window filling factor
Test frequency also influence
2) There are several other materiel similar permeability
You read the material property also, based on the property you can predict the material
Probably yes, but tell me now.
I have T50-10 Black/Clear Epoxy Paint with 11 turn 1mm wire. toroid is ruined and I can not measure it.
I have T50-2 but how to wind it up.
T50-10 Al=3.1 3,1*11*11=375nH but if it not work for a small number of threads ...
T50-2 Al=4,9 4,9*9*9=397nH