hen antenna

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hen antenna

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Antennas : Antenna Calculators Antennas : Baluns
  • When you need a balun - Answer to a common question, Do I have to have a balun in my antenna ?
    [ Hits: 4745 | Votes: 4 | Rating: 5.5 ]
Antennas : Dipole
  • Inverted V - Described is a simple inverted-V antenna which, when used with a balanced ATU, can be used on all the main Radio Amateur HF bands (80, 40, 20, 15 and 10m). The cental support is made in such a way that the wire can be coiled up for storage when the antenna is taken down.
    [ Hits: 3398 | Votes: 1 | Rating: 8 ]
Antennas : Helical
  • The normal-mode helix antenna - A helix will work in the normal mode when the diameter and pitch of the helix is less than 0.1 Lambda
    [ Hits: 3054 | Votes: 7 | Rating: 5 ]
Antennas : Homebrewing Techniques
  • Antenna Impedance measurement - When experimenting on an antenna it's often important to determine its feedpoint impedance at various frequencies across the operating band. It's easy enough to measure SWR, but sometimes we need to know more detail than this
    [ Hits: 1425 | Votes: 6 | Rating: 2.67 ]
Antennas : NVIS
  • NVIS Antennas - Kv5r Understanding NVIS Antennas and Propagation
    [ Hits: 5123 | Votes: 5 | Rating: 10 ]
  • NVIS Antennas and Propagation - Understanding Amateur Radio NVIS Antennas and Propagation
    [ Hits: 1162 | Votes: 0 | Rating: 0 ]
Antennas : Receiving
  • Magnetic antenna fo ULF - Detection and recording of Schumann resonances and other electromagnetic phenomena at frequencies below 50 Hz By Hans Michlmayr
    [ Hits: 1369 | Votes: 0 | Rating: 0 ]
Antennas : Spiral
  • Petlowany Antennas by K6NO - WorldRadio Article on Petlowany antennas base on this principle: if a length of wire is wound into a spiral-shaped coil and excited by a radio frequency current connected to the innermost portion of the coil, it will then, and only then, exhibit RF characteristics that closely approximate those of a resonant linear wire of the same length
    [ Hits: 3765 | Votes: 9 | Rating: 6.22 ]
Antennas : Stealth
  • HF antenna for high rise dwellers - If you have ever tried transmitting on HF from a tall block of apartments, where it's just not possible to erect a substantial aerial system, then this article is for you
    [ Hits: 5014 | Votes: 5 | Rating: 7.92 ]
Antennas : Theory
  • K-FACTOR Table & Chart - Determine the K-Factor used as a multiplier when constructing half-wave antennas.
    [ Hits: 3221 | Votes: 42 | Rating: 4.02 ]
  • Antenna-Theory.com - A source of knowledge for learning about and understanding antennas. The goal is to present a comprehensive tutorial on antennas.
    [ Hits: 704 | Votes: 3 | Rating: 6.67 ]
Antennas : Theory : Antenna Gain
  • G/T Simulations - by VE7BQH - Here you will find information on how antennas behave when stacked G/T is an important figure-of-merit for the antenna's overall receive performance, because it balances forward gain (G) against received thermal noise (T).
    [ Hits: 839 | Votes: 8 | Rating: 7.87 ]
Antennas : Windom
  • Off-Center Feed - The Windom Antenna - The Windom antenna was widely used in the 1930s and is named after the amateur that wrote a comprehensive article about it
    [ Hits: 3566 | Votes: 1 | Rating: 2 ]
Propagation : NVIS Propagation
  • Understanding Amateur Radio NVIS - Understanding Amateur Radio NVIS Antennas and Propagation, derived from The ARRL Antenna Book and QST Articles
    [ Hits: 940 | Votes: 1 | Rating: 9 ]
Radio Equipment : HF Vertical Antenna : Cushcraft R7
  • Troubleshooting Traps - This article refers mainly to the old Cushcraft 1/4 wavelength AV series of antennas (12AVQ, 14AVQ etc) hence the references to radials. The R series (R5, R7 etc) are 1/2 wavelength antennas, and the radials are NOT 1/4 wavelength resonant.
    [ Hits: 2775 | Votes: 0 | Rating: 0 ]
Software : Antenna analysis
  • Meter Mate - SWR Graph Software - Meter Mate is a companion utility for your directional watt meter that allows you to calculate the SWR reading when the forward and reflected power readings are measured. In addition to calculating the antenna system SWR Meter Mate will also plot the SWR curves of all of your antennas onto graphs that may be printed out.
    [ Hits: 1917 | Votes: 12 | Rating: 4.91 ]
  • cocoaNEC - cocoaNEC 2.0 is an opensource Mac OS X application intended primarily for the design and modeling of antennas by Kok Chen, W7AY
    [ Hits: 1610 | Votes: 3 | Rating: 10 ]
Technical Reference : Antenna Switch
  • A Coax Switch - An inexpensive coax switch. shows a proven inexpensive home-made antenna selection switch. If you question the use of a cheap slide switch and SO239 coax sockets, read on. Measurements in a physics lab showed there to be practically no reflection on HF and even on 70 cm the SWR was below 1.3 : 1
    [ Hits: 9676 | Votes: 8 | Rating: 7.5 ]
Technical Reference : Lightning Protection
  • When negative meets positive - Lightning can be a serious hazard depending where you live in the world. Chances are that if you living in an area where lightning strikes are common and you have a communications antenna, it may be attracted to you.
    [ Hits: 427 | Votes: 1 | Rating: 9 ]

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