Radio calculator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Amateur radio calculations
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Here are some calculators for electrical/radio calculations. They are quite simple, but they all work.
Remember that inductances are in nanohenries (nH) (1uH = 1000nH).
Capacitances are listed in picofarads (pf) and resistors are listed in ohms.
Decimal values are not taken into account in the input fields, if you enter a value of 1.9925 it will be taken as 1. Parallel connection of two resistors
(or series capacitors)
Formula: Total resistance = (R1 x R2) / (R1 + R2)
Capacitor reactance
Formula: Reactive resist. = 1 / (2 * Pi * F * C)
Inductor reactance
Formula: Reactive resist. = 2*Pi*F*L
Loop frequency
Formula: F = 1 / (2 * Pi * Sqrt(LC))
The number of turns of a single-layer inductor
| Formula: |
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Number of turns of the multilayer coil
| Formula: |
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Attenuators - "T" and "H" type
| Formulas: |
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The input/output power can be in any electrical unit you prefer, such as Megawatts, Milliwatts, Joules, etc.
Negative values are obtained when invalid attenuator values are entered. For example, it is not possible to connect a device with a 50 ohm line from a 600 ohm line with an attenuation greater than 6.78
Attenuators - bridge type
Formulas:
The input/output power can be in any electrical unit you prefer, such as Megawatts, Milliwatts, Joules, etc.Again, negative values are obtained with invalid attenuator values.Line-of-sight radio range
The radio communication range with line of sight and normal atmospheric refraction depends on the height of the antenna suspension and is determined by the formula below:
Author: Harry Lythall (SM0VPO), translated by Nikolai Bolshakov (RA3TOX), rf.atnn.ru
See other articles Section Amateur radio calculations.
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