coaxial

coaxial

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• 160 meters receiving loop - KD0SO receiving loop for 160 meters
  [ Hits: 567 | Votes: 0 | Rating: 0 ]

• Squarooka Antenna - squared bazooka for 2 meters band - Sort of similar to the one of the 6m omni. Instead of using twin-lead, this design makes use of a more or less regular double bazooka antenna (coaxial dipole). Your attention shall be drawn to the available standart literature, such as Rothammel. In order to "compute" the dimension, Karl Rothammel mentioned that the total length of the dipole shall be 95% of the free-space wavelength. The short-circuit bridges (closing the folded dipole) are to be placed at a distance-fraction being equal to the velocity factor of the coax cable used, which will be 66% using RG-58 or RG174.
  [ Hits: 356 | Votes: 0 | Rating: 0 ]

• 40m Magnetic Loop Antenna - A coaxial cable tuneable magnetic loop antenna for 7MHz. This experimental antenna does not require a tuning capacitor
  [ Hits: 3591 | Votes: 4 | Rating: 8.75 ]

• Build your own HF balun - A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cables. Many hams connect the center conductor of the coaxial cable to one side of the dipole, and the shield to the other. Wrong!
  [ Hits: 1639 | Votes: 5 | Rating: 5 ]
• Common Mode Currents on Coax - These baluns are used to attenuate the common mode current that flows on the outside of the coaxial feed line.
  [ Hits: 176 | Votes: 0 | Rating: 0 ]

• How to build a Coax Balun 1:4 and 1:1 - An air-wound balun made with coaxial cable can not become saturated because no powder iron or ferrite core is present. In this article author explains and compare coax baluns to ferrite baluns with comparison tables and detailed pictures
  [ Hits: 577 | Votes: 8 | Rating: 8.63 ]

• Trap on Coax Cable - A trap on the coaxial cable, also known as choke, helps to eliminate the sneaking of the reflected RF- energy to the shack. The trap can be made from the coaxial cable that feeds the antenna
  [ Hits: 964 | Votes: 2 | Rating: 6.5 ]

• Quarter Waves and Velocity Factor - Coax Velocity Factor in Baluns, Does it Matter? Test results show coaxial cable velocity factor does not always enter into stub length calculations especially in the world of Baluns
  [ Hits: 208 | Votes: 0 | Rating: 0 ]

• VHF UHF Coaxial Dipole Antenna - A base station antenna you can easily build for 146,220 or 440 MHz, with performance similar to a J-pole but smaller and less obstrusive
  [ Hits: 2931 | Votes: 15 | Rating: 5.55 ]

• Southwest Antennas - High-performance rugged antennas and RF accessories such as magnetic mounts, RF coaxial gooseneck adapters, LNAs, BDCs, for law enforcment, military, maritime and video markets.
  [ Hits: 244 | Votes: 0 | Rating: 0 ]

• Amphenol RF - Amphenol RF is a leading manufacturer of coaxial connectors for use in radio frequency, microwave, and data transmission system applications. Headquartered in Danbury, Connecticut, USA, Amphenol RF has global sales, marketing and manufacturing locations in North America, Asia and Europe. Standard products include RF connectors, coaxial adapters and RF cable assemblies. Custom engineered products include multi-port ganged interconnect, blindmate and hybrid mixed-signal solutions.
  [ Hits: 176 | Votes: 0 | Rating: 0 ]
• MPD Digital - Manufacturer RF coaxial cable assemblies for all purposes including GPS, Wifi, RFID, EMS/Police, Military, & Marine. Coaxial cable assemblies made in Albany, Georgia USA
  [ Hits: 168 | Votes: 5 | Rating: 9.8 ]

• Understanding Coaxial Cable Terms - A technical article that want to explain Coaxial Cable terms, specifications and applications. A glossary of technical terms with clear explanations.
  [ Hits: 345 | Votes: 2 | Rating: 8.5 ]
• Check coaxial cable with a multimeter - How to check coaxial cable with a common multimeter
  [ Hits: 1756 | Votes: 12 | Rating: 7.49 ]
• QRO Coaxial Relay for 50 MHz - Build a SPDT coaxial relay that can be used as a main Transmit/Receive relay or an A-B switch to select between two different 6m antennas
  [ Hits: 362 | Votes: 0 | Rating: 0 ]
• Coax Loss Calculator Online by K5VR - RF Feedline (Coax and Ladder-Line) Loss and ERP Calculators made with Javascript. This complex feddline loss calculator has already several line types paramenters for most common coaxial cables from Belden, Time LMR, Wireman and other common products. Result will give Matches loss, SWR loss, dB and Watts power loss.
  [ Hits: 252 | Votes: 2 | Rating: 5 ]
• Coax Cable Attenuation and Power Handling Online Calculator - An on-line coaxial cable attenuation and total power handling calculator, with a lot of cable properties already configured to give the Nominal Attenuation, Maximum Cable Assembly Insertion Loss, Average Power, Cable Vg anf Nominal Td
  [ Hits: 229 | Votes: 2 | Rating: 2 ]

• RF Cable Testing - The cable testing approaches discussed in this article gives an idea about the electrical characteristics of a coaxial cable. Velocity of Propagation, Characteristics Impedance, Return Loss Measurement and more
  [ Hits: 452 | Votes: 2 | Rating: 4 ]
• Coaxial Cable Tester - A simple coax cable tester built based on the KG0ZZ project.
  [ Hits: 911 | Votes: 1 | Rating: 10 ]

• Television Notch Filters - Intersting article about TV interference, with several examples of TVI Filters, to reduce the passage of any RF above the 30 MHz including commercial Low Pass Filters, home made notch filters or coaxial filters.
  [ Hits: 454 | Votes: 2 | Rating: 3 ]

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