On 25 Sep 99, at 15:34, Larry Burke WI5A <lburke@wt.net> wrote:
> I thought I used to have a color code guide for
> one of the more popular manufacturers, but don't seem to afterall. Can
> anyone tell me what material this might be?
>
> Larry WI5A
Here you go. From the ARRL Handbook. Save this to a file. Massage
the tabs to get things to line up. Print out in landscape format on
your printer.
Magnetic Properties Iron Powder Cores
Mix Color Material µ Temp f (MHz)
Notes
stability
(ppm/°C)
26 Yellow/white Hydrogen reduced 75 825 dc - 1 Used
for EMI filters and dc chokes
3 Gray Carbonyl HP 35 370 0.05 -
0.50 Excellent stability, good Q for lower frequencies
15 Red/white Carbonyl GS6 25 190 0.10 - 2
Excellent stability, good Q
1 Blue Carbonyl C 20 280 0.50 -
5 Similar to Mix-3, but better stability
2 Red Carbonyl E 10 95 2 - 30
High Q material
7 White Carbonyl TH 9 30 3 - 35
Similar to Mix-2 and Mix-6, but better temperature stability
6 Yellow Carbonyl SF 8 35 10 - 50
Very good Q and temp. stability for 20-50 MHz
10 Black Powdered iron W 6 150 30 - 100
Good Q and stability for 40 - 100 MHz
12 Green/white Synthetic oxide 4 170 50 - 200
Good Q, moderate temperature stability
17 Blue/yellow Carbonyl 4 50 40 -
180 Similar to Mix-12, better temperature stability, Q drops
about 10% above 50 MHz, 20% above 100 MHz
0 Tan phenolic 1 0 100 -
300 Inductance may vary greatly with winding technique
73, Dave, N3EOY
mailto:daveh@erie.net
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