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: G5RV

  1. #271
      ra6foo
    11.06.2010
    3,014
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  2. #272
      Amw
    21.06.2005
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  3. #273

    20.06.2008
    Minsk, Rep. of Belarus
    6,201
    EW1MM
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    ew1mm Gary; 23.12.2012 13:44.


  4. #274
      Gena-lab
    02.06.2009
    Lugansk
    1,739
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  5. #275

    08.09.2006
    LN05xb St03
    5,153
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    ew1mm Gary
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  6. #276
      Amw
    21.06.2005
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  7. #277

    08.09.2006
    LN05xb St03
    5,153
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    ew1mm Gary
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  8. #278

    20.06.2008
    Minsk, Rep. of Belarus
    6,201
    EW1MM
    Gena-lab
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    The Feeder
    The antenna can be fed by any convenient type of feeder provided always that a suitable type of antenna tuner is used.
    In the original article describing the G5RV antenna, published in the RSGB bulletin November 1966, it was suggested that if coaxial cable feeder was used, a balun might be employed to provide the necessary unbalanced-to-balanced transformation at the base of the matching section. This was because the antenna and its matching section constitute a balanced system, whereas a coaxial cable is an unbalanced type of feeder.

    However, later experiments and a better understanding of the theory of operation of the balun indicated that such a device was unsuitable because of the highly reactive load it would "see" at the base of the matching or "make-up" section on most hf bands...


    Recent experiments by the author to determine the importance or otherwise of "unbalance" effects caused by the direct connection of a coaxial feeder to the base of the matching section had a rather surprising result. They proved that, in fact, the hf currents measured at the junction of the inner conductor or the coaxial cable with one side of the (balanced) matching section and at the junction of the outer coaxial conductor (the shield) with the other side of this section are virtually identical on all bands up to 28mhz, where a slight but inconsequential difference in these currents has been observed. There is, therefore, no need to provide an unbalanced-to-balanced device at this junction when using coaxial feeder.

    However, the use of an unbalanced-to-unbalanced type of antenna tuner between the coaxial output of a modern transmitter (or transceiver) and the coaxial feeder is essential because of the reactive condition presented at the station end of this feeder which, on all but the 14mhz band, will have a fairly high to high vswr on it. This vswr, however, will result in insignificant losses on a good-quality coaxial feeder of reasonable length; say, up to about 70ft (21.3m).
    Because it will, inevitably, have standing waves on it, the actual characteristic impedance of the coaxial cable is unimportant, so that either 50 ohm or 80 ohm type can be used.

    Another very convenient type of feeder that may be used is 75 ohm twinlead. However, because of the relatively high loss in this type of feeder at frequencies above about 7mhz, especially when it has a high vswr on it, it is recommended that not more than about 50 to 60ft (15.2 to 18.3m) of this type feeder be used between the base of the matching section and the antenna tuner...
    ew1mm Gary; 23.12.2012 14:48.


  9. #279
      US0KF
    08.09.2007
    . , RI-01
    317
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    , http://us0kf.ucoz.ru
    ex: 038002, UB5AWK, UB5XY, UB5KF

  10.  RN6HFZ


  11. #280

    08.09.2006
    LN05xb St03
    5,153
    43
    RZ6FE ex RV6HBZ UV6HBZ RA6HZZ UA6-108-26
    ew1mm Gary
    Google: Angle of radiation of the G5RV antenna.
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: 10 (: 4 , : 6)

  1. DL7YAD Alex,
  2. dic1959,
  3. R7WA

  1. G5RV ?
    RV3ADE
    : 6
    : 25.12.2012, 13:27
  2. : 6
    : 30.06.2007, 18:00

g5rv, , ,

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