ICARC Home

Home
 
About
ICARC
Emergency
Operations
Weather
Information
Local Area
Repeaters
Local Area
Nets
Local Area
Radio Clubs
Ham Radio
Resources


Antenna & Coax Calculators




1. Dipole and Inverted Vee Antenna Calculator

A dipole antenna will not only work well on the frequency it is cut for, but also at odd multiples of that frequency. For example, a dipole cut for 7.0 Mhz will also work well on 21 Mhz. Keep this in mind, and you may find it possible to make one antenna work on two bands.

To find the antenna length, you just have to make a simple calculation:

468 divided by Frequency in MHz  =  Dipole Length in Feet

That is the only formula you ever need to know to build a dipole antenna. However, to make it even easier, here is a simple calculator to do the work for you...

Antenna Calculator


Antenna resonant frequency = MHz.

An Inverted Vee is percent shorter.





Dipole total length = feet
Each leg of the dipole = feet

Inverted Vee total length = feet
Each leg of the Inverted Vee = feet






2. Line Loss Calculator

Coax Cable Types

  • Belden
    • Belden 8215    (RG-6A)
    • Belden 8237    (RG-8)
    • Belden 9913    (RG-8)
    • Belden 9258    (RG-8X)
    • Belden 8213    (RG-11)
    • Belden 8261    (RG-11A)
    • Belden 8240    (RG-58)
    • Belden 9201    (RG-58)
    • Belden 8219    (RG-58A)
    • Belden 8259    (RG-58C)
    • Belden 8212    (RG-59)
    • Belden 8263    (RG-59B)
    • Belden 9269    (RG-62A)
    • Belden 83241   (RG-141A)
    • Belden 8216    (RG-174)
    • Belden 8267    (RG-213)
    • Belden 9913F7
    • Belden 7810A
    • Belden 7808A

  • Davis RF
    • Davis RF Bury-Flex

  • Times Microwave Systems
    • TMS LMR-100A
    • TMS LMR-200
    • TMS LMR-240
    • TMS LMR-400
    • TMS LMR-600
    • TMS LMR-900

  • Wireman (coax)
    • Wireman CQ102   (RG-8)
    • Wireman CQ106   (RG-8)
    • Wireman CQ125   (RG-58)
    • Wireman CQ127   (RG-58C)
    • Wireman CQ110   (RG-213)

  • Radio Shack
    • Tandy Cable RG-8X
    • Tandy Cable RG-58
    • Tandy Cable RG-59

  • Andrew
    • Andrew Heliax LDF4-50A
    • Andrew Heliax LDF5-50A
    • Andrew Heliax LDF6-50A

  • Wireman (ladder line)
    • Wireman 551 Ladder Line
    • Wireman 552 Ladder Line
    • Wireman 553 Ladder Line
    • Wireman 554 Ladder Line
    • Wireman 551 (wet)
    • Wireman 552 (wet)
    • Wireman 553 (wet)
    • Wireman 554 (wet)

  • Miscellaneous
    • Generic 300 ohm Tubular
    • Generic 450 ohm Window
    • Generic 600 ohm Open
    • Ideal (lossless) 50 ohm
    • Ideal (lossless) 75 ohm

The "wet" numbers represent worst case for lines covered with ice or snow.


Quick Line Loss Calculator.
(Note that the simple program used on this web page gives only an approximation of the additional losses due to SWR.)

Enter Parameters Here
Line Type
Line Length Feet Meters
Frequency  MHz
Load SWR  : 1
Transmitter Power  W
Results
Matched Loss  dB
SWR Loss  dB
Total Loss  dB
Power to Antenna  W



Last updated April 17, 2017 by KØCF