My own small Formulars collection
This page is underconstruction !!!
Ohms law:
Resistors Decade values:
E3: 10 22 47
E6: 10 15 22 33 47 68
E12: 10 12 15 18 22 27 33 39 47 56 68 82
E24: 10 11 12 13 15 16 18 20 22 24 27 30 33 36 39 43 47 51 56 62 68 75 82 91
Resistors:
In Series. Rtotal = R1 + R2
In Parallel. 1/Rtotal = 1/R1 + 1/R2 + and so on
or 
Capasitors:
or 
Cap in series with a resistor:
Coils:
Coil in series with a resistor:
Resonance:
Wavelength:
Bipolar Transistors:
Field effect Transistors:
Return Loss / VSWR:1 / Reflection Coeff.
3dB / 5.8 / 0.7
6dB / 3 / 0.5
10dB / 2 / 0.3
15dB / 1.4 / 0.2
20dB / 1.2 / 0.1
25dB / 1.1 / 0.06
30dB / 1.06 / 0.03
POWER LOSS AT VARIOUS SWR READINGS
| SWR READING |
% OF LOSS |
ERP* |
WATTS AVAILABLE |
| 1.0:1 |
0.0% |
100.0% |
25.0 |
| 1.1:1 |
0.3% |
99.7% |
24.9 |
| 1.2:1 |
0.8% |
99.2% |
24.8 |
| 1.3:1 |
1.7% |
98.3% |
24.6 |
| 1.4:1 |
2.7% |
97.3% |
24.3 |
| 1.5:1 |
3.0% |
97.0% |
23.5 |
| 1.6:1 |
5.0% |
95.0% |
23.7 |
| 1.7:1 |
6.0% |
94.0% |
23.5 |
| 1.8:1 |
8.0% |
92.0% |
23.0 |
| 2.0:1 |
11.0% |
89.0% |
22.3 |
| 2.2:1 |
14.0% |
86.0% |
21.5 |
| 2.4:1 |
17.0% |
83.0% |
20.8 |
| 2.6:1 |
20.0% |
80.0% |
20.0 |
| 3.0:1 |
25.0% |
75.0% |
18.8 |
| 4.0:1 |
38.0% |
62.0% |
15.5 |
| 5.0:1 |
48.0% |
52.0% |
13.0 |
| 6.0:1 |
55.0% |
45.0% |
11.3 |
| 10.0:1 |
70.0% |
30.0% |
7.5 |
Optics:
Heat
Materials
0.0177 * Length in meters
------------------------- = ohm, Cobber resistance:
area in mm2
The Temperature Coefficient of Copper (near room temperature) is +0.393 percent per degree C.
This means if the temperature increases 1°C the resistance will increase 0.393%.
Skin Effect:
MHz Depth of Penetration sigma (mm)
0.01 0.660
0.1 0.209
1 0.066
10 0.021
100 0.0066
1000 0.0021
Coax specifications
