enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Jim Creek Naval Radio Station - Wikipedia

   en.wikipedia.org/wiki/Jim_Creek_Naval_Radio_Station

   Much of the site is devoted to the enormous overhead wire antenna array that is necessary to efficiently radiate the VLF waves. The antenna, shown above, consists of ten catenary cables, 5,640–8,700 ft (1,719–2,652 m, 1.1–1.6 miles) long, suspended in a zigzag pattern over the valley between Wheeler mountain and Blue mountain on twelve 200 ft. towers on the mountains' crests.

3. General Mobile Radio Service - Wikipedia

   en.wikipedia.org/wiki/General_Mobile_Radio_Service

   TIDRADIO TD-H5 GMRS radios. The General Mobile Radio Service (GMRS) is a land-mobile FM UHF radio service designed for short-range two-way voice communication and authorized under part 95 of the US FCC code. It requires a license in the United States, but some GMRS compatible equipment can be used license-free in Canada. The US GMRS license is ...

4. Personal radio service - Wikipedia

   en.wikipedia.org/wiki/Personal_radio_service

   MURS is often used for data transmissions as well as portable and mobile voice communications, due to the external high-gain antenna provision, MURS offers the possibility of greater range than FRS. As with CB, FRS and GMRS, there are reports of users using higher-than-legal power levels on the MURS frequencies. [19]

5. Non-line-of-sight propagation - Wikipedia

   en.wikipedia.org/wiki/Non-line-of-sight_propagation

   For example, this mode is used to send radio signals over a mountain range when a line-of-sight path is not available. However, the angle cannot be too sharp or the signal will not diffract. The diffraction mode requires increased signal strength, so higher power or better antennas will be needed than for an equivalent line-of-sight path.

6. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   Although no real antenna can be exactly isotropic, a few antennas are built to be as near to isotropic as possible; they are used for emergency backup antennas and for test equipment for other antennas: Because the received and transmitted signal strength is the same in (almost) every direction, they work without any need for them to be any ...

7. Near vertical incidence skywave - Wikipedia

   en.wikipedia.org/wiki/Near_Vertical_Incidence...

   An NVIS antenna configuration is a horizontally polarized (parallel with the surface of the earth) radiating element that is from ⁠ 1 / 20 ⁠ th wavelength to ⁠ 1 / 4 ⁠ wave above the ground. The optimum height of such an antenna is about ⁠ 1 / 4 ⁠ wavelength, and high angle radiation declines only slightly for heights up to about ...