Jump to content
Main menu
Main menu
move to sidebar
hide
Navigation
Main page
Recent changes
Random page
Help about MediaWiki
Special pages
Niidae Wiki
Search
Search
Appearance
Create account
Log in
Personal tools
Create account
Log in
Pages for logged out editors
learn more
Contributions
Talk
Editing
Very high frequency
(section)
Page
Discussion
English
Read
Edit
View history
Tools
Tools
move to sidebar
hide
Actions
Read
Edit
View history
General
What links here
Related changes
Page information
Appearance
move to sidebar
hide
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
==Antennas== {{see also|UHF television broadcasting#UHF vs VHF}} [[File:Superturnstile Tx Muehlacker.JPG|thumb|A VHF television broadcasting antenna. This is a common type called a super turnstile or [[batwing antenna]]. ]] VHF is the first band at which wavelengths are small enough that efficient transmitting antennas are short enough to mount on vehicles and handheld devices, a [[whip antenna|quarter wave whip antenna]] at VHF frequencies is 25 cm to 2.5 meter (10 inches to 8 feet) long. So the VHF and UHF wavelengths are used for [[two-way radio]]s in vehicles, aircraft, and handheld [[transceiver]]s and [[walkie-talkie]]s. Portable radios usually use [[whip antenna|whips]] or [[rubber ducky antenna]]s, while base stations usually use larger fiberglass whips or [[collinear antenna array|collinear arrays]] of vertical dipoles. For directional antennas, the [[Yagi-Uda antenna|Yagi antenna]] is the most widely used as a [[high gain antenna|high gain]] or "beam" antenna. For television reception, the Yagi is used, as well as the [[log-periodic antenna]] due to its wider bandwidth. [[Helical antenna|Helical]] and [[turnstile antenna]]s are used for [[satellite communication]] since they employ [[circular polarization]]. For even higher gain, multiple Yagis or helicals can be mounted together to make [[array antennas]]. Vertical [[collinear antenna array|collinear arrays]] of dipoles can be used to make high gain [[omnidirectional antenna]]s, in which more of the antenna's power is radiated in horizontal directions. Television and FM broadcasting stations use collinear arrays of specialized dipole antennas such as [[batwing antenna]]s.
Summary:
Please note that all contributions to Niidae Wiki may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see
Encyclopedia:Copyrights
for details).
Do not submit copyrighted work without permission!
Cancel
Editing help
(opens in new window)
Search
Search
Editing
Very high frequency
(section)
Add topic