The -3 dB beam width with that horizontal spacing between ... Then I just thought of HF band operations with highly directive antennas where an op must rotate the antenna like crazy for the whole ...

Assorted dipoles work on several HF bands and there is no interference with the telecom ... makes a call over one of the 144 MHz repeaters which are in use on Sri Lanka. The home-made rotary beam ...

The Berrimah radar is located on a rise with the dish antenna tower ... due to several HF transmitter towers. Heavy rain over the radar site will cause attenuation of all signals. Path atte nuation ...

A crane lowers the 112-foot-wide (34-meter-wide) steel framework for the Deep Space Station 23 (DSS-23) reflector dish into ...

MTI Wireless received a repeat order from Israel for the manufacture of military antennas worth about $4 million. The London-listed technology group, which produces communication and radio frequency ...

Rangsons Aerospace and global firm Oversat are set to collaborate on advanced Luneberg lens-based multibeam antennas for ...

Here’s how it works. The best TV antennas are a critical element of any living room. I couldn't live without my TV antenna. It's as important to me as any streaming service because it allows me ...

The best indoor TV antennas let you access local broadcast channels without paying for a cable, satellite, or streaming subscription. Many top TV antennas are affordable, paper-thin, and easily ...

Abstract: This paper describes a new method for synthesis of a flat-top beam radiation pattern of three-element antenna arrays. Currently, this is the only method that: (1) gives a semi-analytical ...

To fully exploit the flexibility of existing on-board phased array multi-beam antennas in the presence of non-uniform demand distribution, the beam scheduling optimization problem is formulated aiming ...

At relativistic speeds — that is near the speed of light — time moves more slowly, which would mean the electron beam wouldn't have enough time to spread out, keeping the beam focused.