Calculation cable attenuation treble loss cable length and mic cable capacity cutoff frequency microphone wire damping capacitance capacity C - sengpielaudio
 
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Calculation of Cable Attenuation (Loss)
Cable Length and Cable Capacitance
Treble Loss (Attenuation) and Cutoff Frequency
Line capacitance and Line calculation
Cut-off frequency = corner frequency = crossover frequency
= half-power frequency = 3 dB frequency = break frequency is all the same.
 
Mikrofonkabel
 
This is not about coaxial cables, antennas and satellite frequencies.
Here we have a look at a normal audio, mic or
microphone cable.
 
Cable and treble attenuation   
treble cut filter (low pass)   
Simplified principle
C = Cspec ·
d
RC-pad = cable
 
A frequently asked question is at which cutoff frequency fc the microphone cable has a (−) 3 dB loss of treble? Which treble frequencies are attenuated? Which length d a cable can have to reach this attenuation? How are high frequencies attenuated by the length of the cable?
Cables are characterized by the capacity of the cable between the conductors, the resistance, inductance of the cable along the conductor, and the current crowding, which boost the resistance at high frequencies. The
microphone cable usually has a capacitance from wire to wire of about Cspec = 100 pF per meter.
The line resistance, and the inductance is usually negligible in practice. Each wire has an unavoidable cable capacitance, that leads to the attenuation of high frequencies, called
cable loss. Because the input resistance (load) is large against the small output impedance (source), the input impedance (load) can be neglected.

Calculating the treble cutoff frequency fc of a cable

 
 Source impedance Zout  ohms
Capacitance C per m  pF/m
Cable length d  meters 
 
                
 
Cutoff frequency fc  Hz
 
fc = Cutoff frequency at (−)3 dB treble loss in Hz
Zout = Output impedance of microphone, source impedance
Cspec = Specific capacitance of the cable in pF per m cable length
d = Cable length of the cable in m            C = Cspec × d
1 pF (Picofarad) = 10−12 F (Farad)
 
Formula for the cutoff frequency fc of the (−)3 dB treble attenuation:
Cable cutoff frequency - sengpielaudio

Another frequently asked question is of how long can the microphone cable be,
without having treble loss?

Cable length or line length
 
Calculation of the length of a cable at 3 dB treble attenuation

 
 Source impedance Zout  ohms
Capacitance C per m  pF/m
Cutoff frequency fc  Hz
 
               
 
Cable length d  meters 
 
d = Cable length in m
fc = Cutoff frequency at (−)3 dB treble loss in Hz
Zout = Output impedance of microphone, source impedance
Cspec = Capacitance in pF per m cable length     C = Cspec × d
1 pF (Picofarad) = 10−12 F (Farad)
 
Formula for the length of the cable d and a given cutoff frequency fc:
Cable length - sengpielaudio
 
If you want to know how long the cable can be and permit a level attenuation
of only 1 dB, you need to enter the double value of the cutoff frequency.
 
Cable characteristic impedance is a cable characteristics which is only
valid for radio frequency signals. Multimeters use DC current for resistance
measurements, so you cannot measure the cable impedance using your
multimeter or other simple measurement equipment.

Capacitance C, frequency f, and capacitive reactance XC

Converting feet to meters and vice versa
for U.S.A only. It's better to go metric - like the whole world.

To use the calculator, simply enter a value.
The calculator works in both directions of the
sign.

 
Feet (ft) 
ft
 ↔  Meters (m) 
m
     
1 foot = 0.3048 m                                 1 meter = 3.280839895 ft

Cable, wire, and wiring - Conversion of diameter to cross-sectional area

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