# Forumlae for delay in pair-wise twisted single conductors for frequencies>10MHz

• freddyfish
In summary, the conversation is about finding formulas for calculating the delay of impulses in single conductors twisted around each other with specific parameters. The usual relations are not applicable at high frequencies, so tips and warnings are needed to avoid potential problems. The main things to consider are the cable specs such as propagation velocity, loss versus frequency, and dispersion. Specific details such as distance and insulator type can also affect the delay. Dispersion can cause difficulties in recognizing the delayed pulse.
freddyfish
I would like to know if anyone knows any good formulas for calculating the delay of impulses in single conductors twisted around each other when the period of the impulses is 1μs and the pulses are 20ns long.

Some of the usual relations are no longer applicable in this case due to the very high frequency, so I am fishing for some tips and some warnings about all the pits you can fall into facing a problem like this.

Thanks

freddyfish said:
I would like to know if anyone knows any good formulas for calculating the delay of impulses in single conductors twisted around each other when the period of the impulses is 1μs and the pulses are 20ns long.

Some of the usual relations are no longer applicable in this case due to the very high frequency, so I am fishing for some tips and some warnings about all the pits you can fall into facing a problem like this.

Thanks

The main things to look in the cable specs are are the propagation velocity, the loss versus frequency, and the dispersion. What specific cables are you looking at?

What distance!

And what insulator, shape, size...

Depending on that, you can receive a delayed pulse, or more often, a thing hard to recognize, because of dispersion.

## 1. What is the purpose of the formula for delay in pair-wise twisted single conductors?

The formula for delay in pair-wise twisted single conductors is used to calculate the time it takes for an electrical signal to travel through a twisted pair cable. This information is important in designing and optimizing high-speed data transmission systems.

## 2. What factors are included in the formula for delay in pair-wise twisted single conductors?

The formula takes into account the physical properties of the cable, such as the length, diameter, and dielectric constant, as well as the frequency of the signal being transmitted.

## 3. How is the formula for delay in pair-wise twisted single conductors derived?

The formula is derived from the principles of electromagnetic wave propagation and transmission line theory. It takes into account the line inductance, capacitance, and resistance, as well as the velocity of propagation of the signal.

## 4. Can the formula for delay in pair-wise twisted single conductors be applied to all types of cables?

The formula is specifically designed for twisted pair cables, which are commonly used in data communication systems. It may not be applicable to other types of cables, such as coaxial or fiber optic cables.

## 5. How accurate is the formula for delay in pair-wise twisted single conductors?

The formula provides a reasonably accurate estimate of the delay in pair-wise twisted single conductors. However, it is important to note that there may be other external factors, such as interference or crosstalk, that can affect the actual delay in a real-world scenario.

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