RF Cafe Software

RF Cascade Workbook

About RF Cafe

Copyright

1996 -
2022

Webmaster:

Kirt Blattenberger,

BSEE
- KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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A finite amount of time is required for a signal to travel from one place to another. In a vacuum, electromagnetic
energy travels at 2.9979*10^{5} km/s (186,282 mi/s). The following equation holds for signal propagation time in a vacuum
(and in the air),
where the relative dielectric constant (ε_{r}) is 1. In keeping with a radar theme, 'R' is used for
range rather than the more common 'd' for distance. Be sure to keep dimensional units consistent across all values.

If a radar system is being evaluated where a round trip out and back needs to be accounted for, then double the range figure. A "radar mile," which is a nautical mile out and a nautical mile back, is 12.36 μs.

Note: Only enter values in the yellow cells or risk overwriting formulas! |

Two charts of propagation time vs. distance are provided below - one for units of km and one for units of miles.

Here is information on Doppler, radar equation and path loss.

A 1-Way and 2-Way Path Loss Calculator is included in RF Cafe Calculator Workbook for FREE.

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