The PacketRadio Operator's Antenna Handbook

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QUICK INDEX

BUT FIRST.... let's review some antenna "basics" in pictorial form.




CLICK ON the small graphic to view full size.



CLICK ON the small graphic to view full size.



CLICK ON the small graphic to view full size.











A=Benz-O-Matic propane torch; B=Lead-Free solder; C=Tape measure: D=Tubing cutter; E=Sharpie marking pen; F=Solder Paste; G=1/2 inch copper caps; H=Hardcopy of the above drawing; I=Wet Towel; J=PreCut, ready to assemble parts of the 2 meter J-Pole.








CLICK HERE AND DESIGN YOUR OWN "J" Pole


Design-A-Quad Antenna
Calculate the total wire length for each element of a quad antenna.
REFLECTOR = 1030 / F (MHz)
DRIVEN = 1005 / F (MHz)
DIRECTOR 1 = 975 / F (MHz)
DIRECTOR 2 = 960 / F (MHz)

ELEMENT SPACING between:
1) Reflector & Driven Element = 730 / F (MHz)
2) Driven Element & 1st Director= 600 / F (MHz)
3) 1st Director & 2nd Director = 600 / F (MHz)

Enter the formula for the antenna calculation
Divided by Freq MHz
Total wire-length in feet is FEET.
Total wire-length in inches is INCHES.
One of four sides in FEET = <- Use ONLY this number for "element spacing" when entering the element spacing numbers (constants; 730 or 600) above!
Total all spacing measurements (in inches) then add 2 inches for each end.

THE QUAD SHOWN BELOW IS AN EXAMPLE OF A QUAD DESIGN USING DESIGN-A-QUAD ABOVE


Calculate Vertical Isolation of Omni Antennas! CLICK the "BACK" arrow to return to this page!
Calculate Horizontal Isolation between Omni Antennas CLICK the "BACK" arrow to return to this page!
Calculate Base to Mobile Path Loss CLICK the "BACK" arrow to return to this page!
Calculate Free Space Path Loss CLICK the "BACK" arrow to return to this page!
Convert dBs - Watts/volts CLICK the "BACK" arrow to return to this page!
Calculate (absolute) Wavelength CLICK the "BACK" arrow to return to this page!
Calculate VSWR (Standing-Wave) CLICK the "BACK" arrow to return to this page!
Calculate 1/4 wave xformer CLICK the "BACK" arrow to return to this page!
Grouped Calculation Formulas CLICK the "BACK" arrow to return to this page!

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copyright © 2000, 2001 & 2002 by Frank Cross.
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