K7TJO Metric to imperial calculator Feet inches and fractions of an inch
Element length scaling calculator for scaling the antenna you read about to the frequency you want with the materials you have.

## Inches and meters Javascript Wavelength Calculator

 Input frequency in mhz Decimal Inches Feet and Inches Wavelength in meters Wavelength in cm 5/8 Wavelength in cm 1/2 Wavelength in cm 1/4 Wavelength in cm 1/6 Wavelength in cm 1/10 Wavelength in cm 4/3 Wavelength in cm λ decimal feet 5/8λ decimal feet 1/2λ decimal feet 1/4λ decimal feet 1/6λ decimal feet 1/10λ decimal feet 4/3λ decimal feet Wavelength in inches 5/8 Wavelength in inches 1/2 Wavelength in inches 1/4 Wavelength in inches 1/6 Wavelength in inches 1/10 Wavelength in inches 4/3 Wavelength in inches For folks with only old tapes and rulers. λ 5/8 λ 1/2 λ 1/4 λ 1/6 λ 1/10 λ 4/3 λ (Hentenna circ.)
To calculate electrical wavelength, change the velocity factor.
Velocity Factor
Things to notice: try frequencies 149.9, 299.7, 494, and 983.5 with no velocity factor.
Try 142.38 284.8 and 468 with 95% end effect factor. Notice the resultant wavelengths.
These numbers should look familiar by now...
top | next scaling K7TJO

## Calculator for converting feet to inches and meters and back including fractions!

Enter the data you have. The rest will change. If it doesn't change right away, click the calculate button closest to the data you entered.
decimal inches Or:
decimal feet
meters
centimeters

You can even put in the feet and inches and fractions of an inch below
If the calculations don't happen as expected, try clicking the calculate buttons a second time.)
feet inches:

## Element length scaling including wire diameter

### For linear elements only, not for antennae with corners :-)

Formulae from www.cebik.com/vhf/scales.html

## Each Element requires a separate calculation as it is NOT a linear function.

Half wavelength elements scale directly as the ratio of wavelengths.
Elements longer than 1/2 wavelength will vary in the direction of the change in wire diameter. Fatter → longer.
Elements shorter than 1/2 wavelength will vary inversely with the change in wire diameter. Fatter → shorter.
 AWG Size Dia. Inches Dia. mm 18 .0403 1.0236 16 .0508 1.2903 14 .0641 1.6281 12 .0808 2.0523 10 .1019 2.5883 8 .1285 3.2640
 Original design frequency MHZ WL0/2 m ft Original Diameter Inches   mm   AWG* Original element length feet inches meters New design frequency MHZ WL1/2 m ft New   diameter Inches mm   AWG* Scaled length at New Frequency and New Wire Diameter feet inches meters Ω Element Reactance λ1/λ0 =    while L1/L0 =

λ/2 ft Plus DELTAL = ft
Scaled length at New Frequency and New Wire Diameter

AWG lookup. Enter either the guage or the diameter in inches and the other will change to match.
AWG* number diameter inches
*In the A.W.G. system, each size is 1.122932195663452 times the diameter of the next smaller size, based on an original concept of 40 sizes in arithmetic progression ranging from .460 in.(#0000) to .005 in.(#36).