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236 links about wireless on dxzone.com

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Antennas : Feed Lines
  • Transmission Lines - Whenever you choose a coax feedline, the frequency of operation is a very important consideration. Over the operating bandwidth of the coax the VSWR is low, typically 1.2:1 or better. Insertion loss is also an important parameter. It is usually specified in dB/foot and is a linear relationship.
    [ Hits: 1124 | Votes: 0 | Rating: 0.00 ]
  • SWR: Maximum allowable VSWR - VSWR (voltage-standing-wave-ratio) represents the degree with which an antenna is "matched" to the system impedance. Most modern antennas do not require any tuning for optimum performance. VSWR is one of the easiest parameters to measure and VSWR meters are becoming very popular antenna installation tools
    [ Hits: 1059 | Votes: 3 | Rating: 3.33 ]
Antennas : Helical
  • Helix Calc  updated - Helix antenna calculator, to design and make helix antenna plans
    [ Hits: 7298 | Votes: 155 | Rating: 5.82 ]
  • Online helix antenna calculator - PHP Helical antenna calculator, need SVG viewer
    [ Hits: 5245 | Votes: 22 | Rating: 6.10 ]
Antennas : Homebrewing Techniques
  • Yagi Element Mounting Considerations - One of the most important considerations when designing and building a Yagi antenna is the method used to attach the elements to a boom. This is true because the boom influences the electrical length of the elements. In this article JH Reisert explain with drawings techniques on mounting yagi antenna elements to a boom
    [ Hits: 3776 | Votes: 0 | Rating: 0.00 ]
Antennas : Theory
  • Antenna Selection Made Easy - This page will help you answer important questions about antenna selection before you talk to a supplier. After reading this paper, you should be able to better determine the most important parameters you need to know for your antenna selection criteria.
    [ Hits: 1731 | Votes: 2 | Rating: 3.00 ]
  • Antenna Polarization notes - Antenna polarization is a very important consideration when choosing and installing an antenna. Most communications systems use either vertical, horizontal or circular polarization. Knowing the difference between polarizations and how to maximize their benefit is very important to the antenna user.
    [ Hits: 2195 | Votes: 4 | Rating: 3.50 ]
Antique Radios : Museums
  • The Telegraph Office - A Tribute to Morse telegraphy and resource for wire and wireless telegraph historians and key collectors
    [ Hits: 1116 | Votes: 1 | Rating: 10.00 ]
FRS and GMRS : Resources Internet and Radio : Directories
  • RF Cafe - Amateur Radio Links - RF Cafe is a unique portal of RF, microwave, wireless, and other engineering resources. Vast collection of equations, references and conversions for electrical, mechanical, physical, and mathematical fields.
    [ Hits: 977 | Votes: 0 | Rating: 0.00 ]
Manufacturers : Accessories
  • CES Wireless Technologies - CES Wireless Technologies manufacturer of Mobile information Systems including Dispatch and Mapping Software, GPS, AVL, Mobile Data Display Terminals, ANI, CTCSS, and Microphones
    [ Hits: 394 | Votes: 2 | Rating: 5.50 ]
Manufacturers : Digital and Packet Radio
  • RACOM - Radio modems - RACOM is a Czech company specialized in design and production of radio modems and other devices for wireless data networks for radio channels from 140 to 900 MHz. RACOM radio data networks are suitable for data transfer in telemetry & SCADA applications, transaction networks, security systems, IP networks and firts of all mobile tracking and fleet management.
    [ Hits: 651 | Votes: 2 | Rating: 9.00 ]
Manufacturers : Microwave
  • Low Power Radio Modules - Low power radio modules - supplying rf modules, rf transceivers, radiometrix transmitters receivers, low power radio modules, scada, frequency hopping, 900 mhz, wireless data transmission, data telemetry, gps modules & receivers and more
    [ Hits: 572 | Votes: 0 | Rating: 0.00 ]
  • CAP Wireless Amplifiers - Design and manufacture application specific microwave and RF amplifiers, upconverters, downconverters and multifunction assemblies.
    [ Hits: 589 | Votes: 4 | Rating: 7.00 ]
Manufacturers : Morse Keyers
  • Wireless Touch Paddle - CW paddle with no wires and no moving parts
    [ Hits: 1633 | Votes: 0 | Rating: 0.00 ]
Manufacturers : Parts and Surplus
  • TestInHouse - Manufacturer of RF Shielded boxes, RF shielded enclosures, test accessories for wireless phones and handhelds testing. RF and Audio test solutions. GSM, CDMA, BlueTooth, Wi-fi test.
    [ Hits: 353 | Votes: 0 | Rating: 0.00 ]
Manufacturers : Towers and Accessories
  • International Tower Supply - Manufactures and distributes tower and wireless site components including antenna and sector mounts, site hardware, ice bridge and cable tray. Specializing in custom fabrication of work and equipment platforms; all hot-dipped galvanized.
    [ Hits: 1848 | Votes: 5 | Rating: 7.60 ]
  • Telecom Product Profiles - Telecom Product Profiles is a manufacturers' rep firm specializing in factory direct Nello Towers, monopoles, antenna mounts, shelters, and more. Factory direct Cellular, PCS, and Wireless Broadband equipment such as antennas, radios, and more. Installation, financing, and leasing options available.
    [ Hits: 758 | Votes: 1 | Rating: 10.00 ]
Operating Aids : Beginner's Guides : What Amateur Radio is
  • How ham radio works - How Ham Radio Works, by Gary Brown, Ham radio can be very portable and affordable. In this article, we will look at ham radio and show you how to get started in this wireless world
    [ Hits: 2508 | Votes: 1 | Rating: 10.00 ]
Operating Modes : Morse code
  • How to build a simple wireless telegraph set - The simplest wireless telegraph set consists of a means of generating and controlling a spark which sends out radio waves into the air, and a receiver or detector to detect the radio waves.
    [ Hits: 4377 | Votes: 27 | Rating: 3.97 ]
Publications : Manuals
  • CES Product Manuals - CES Wireless Technologies is a world leader in the design, manufacture and implementation of Wireless Signalling products - Including GPS, AVL, MDT's, Mobile Data Terminals, CTCSS, and Microphones
    [ Hits: 409 | Votes: 0 | Rating: 0.00 ]
Shopping and Services : Ham Radio Stores
  • Lentini Communications, Inc. - Lentini Communications, Inc. was established in 1954. Located in Newington, Connecticut, home of the American Radio Relay League, retail and mail order outlet serves all your wireless communication needs. Stock amateur, CB and shortwave radios as well as Nextel cellular phones and more.
    [ Hits: 4272 | Votes: 15 | Rating: 6.28 ]
Technical Reference : Coax Cables and Connectors
  • Coaxial Cable & Power Handling - This calculator can be used to estimate the attenuation (dB loss), power handling capability, and transmission efficiency for some of the more popular Wireless Communications and MIL Spec cables at the frequency of interest
    [ Hits: 881 | Votes: 6 | Rating: 4.17 ]
  • RF Coaxial Connectors - RF coax(ial) connectors are a vital link in the radio spectrum. Coax connectors are often used to interface two units such as the antenna to a transmission line, a receiver or a transmitter. The proper choice of a coax connector will facilitate this interface.
    [ Hits: 3859 | Votes: 0 | Rating: 0.00 ]
Technical Reference : Lightning Protection
  • About Lightning Protection - What You Should Know About Lightning Protection by Joseph H. Reisert
    [ Hits: 2757 | Votes: 1 | Rating: 8.00 ]
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