Difference between revisions of "MarkHinton/116 Wave Handheld Dipole"
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< User:MarkHinton
MarkHinton (talk | contribs) (Created page with "= Introduction = '''NOTE: This antenna is only theoretical and has yet to be tested, performance is ''not'' guaranteed, please direct any test results and advice to the talk page...") |
MarkHinton (talk | contribs) m (Minor touches at the recommendation of ka3jjz) |
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= Introduction = | = Introduction = | ||
| − | '''NOTE: This antenna is only theoretical and has yet to be tested, performance is ''not'' guaranteed, please direct any test results and advice to the | + | '''NOTE: This antenna is only theoretical and has yet to be tested, performance is ''not'' guaranteed, please direct any test results and advice to the Forums.''' |
This is a 1/16λ dipole antenna made from coax and a preferred connector (such as BNC), the figures used on this page are based on VHF civil airband and expressed using the metric system. | This is a 1/16λ dipole antenna made from coax and a preferred connector (such as BNC), the figures used on this page are based on VHF civil airband and expressed using the metric system. | ||
| Line 21: | Line 21: | ||
*Connector of choice | *Connector of choice | ||
*Sharp object capable of removing the sheath and shield of the cable | *Sharp object capable of removing the sheath and shield of the cable | ||
| − | *Electrical tape | + | *Electrical tape or shrink tube |
*Dowel or other stiff nonmatallic object (optional). Keep in mind that the antenna will be quite floppy without it | *Dowel or other stiff nonmatallic object (optional). Keep in mind that the antenna will be quite floppy without it | ||
Latest revision as of 14:20, 7 October 2011
Contents
Introduction
NOTE: This antenna is only theoretical and has yet to be tested, performance is not guaranteed, please direct any test results and advice to the Forums.
This is a 1/16λ dipole antenna made from coax and a preferred connector (such as BNC), the figures used on this page are based on VHF civil airband and expressed using the metric system.
Maths
c = 299792458 m/s
ν = 122500000.0000 Hz
Just use these two simple formulae to calculate the length of your antenna elements and the total size of the antenna.
Total size: c/ν*100/16=λt
Element size: c/ν*100/32=λe
λt = 15.30cm
λe = 7.65cm
Building
Parts required:
- Coaxial cable
- Connector of choice
- Sharp object capable of removing the sheath and shield of the cable
- Electrical tape or shrink tube
- Dowel or other stiff nonmatallic object (optional). Keep in mind that the antenna will be quite floppy without it
Steps
- Strip cable and install connector.
- Measure λt cm from the end of the connector (where it mounts onto your radio) and cut entire cable to length.
- Measure λe cm from the end of the connector and cut through sheath and shield, preserving the dielectric and center conductor.
- Install dowel if desired, and then wrap entire assembly from the base of the cable to the end of the cable.
- Test it out and let me know how it goes, preferably through both the talk page and through forum PM!