preps
Results 1 to 9 of 9

Thread: What's the Purpose - MultipleDirectors

  1. #1
    Join Date
    Mar 2022
    Location
    Cntrl Alabama
    Posts
    145
    Thanks
    7
    Thanked 26 Times in 26 Posts
    Downloads
    1
    Uploads
    0

    What's the Purpose - MultipleDirectors

    Please tell me the ground truth what is the purpose of having multiple director elements on a Dipole, a Yagi?
    All answers are opinions and may, or may not be technically correct.

  2. #2
    Join Date
    Mar 2022
    Location
    Cntrl Alabama
    Posts
    145
    Thanks
    7
    Thanked 26 Times in 26 Posts
    Downloads
    1
    Uploads
    0
    It is beyond me why more than one is necessary? Pinpoint accuracy?
    All answers are opinions and may, or may not be technically correct.

  3. #3
    Join Date
    Jan 2012
    Location
    Republic of Texas
    Posts
    865
    Thanks
    127
    Thanked 536 Times in 341 Posts
    Downloads
    0
    Uploads
    0
    Directors force more of the signal towards them, making the antenna more directional in that direction...more directors you have, the more forward gain you get...

    Add a reflector behind the driving element and you will cut out allot of the signal coming in (and going out) the back side.

    side note...the more directors you add, the more forward gain you get, but at the same time your out-going signal pattern will get more narrow...An example would be like if with just one director you can talk to the whole East Coast from like Texas...then if you add 2 or 3 more directors then who ever your talking to will hear you louder, but instead of picking up the whole east coast, you would only be able to pick up maybe one or two States in the direction your pointed...

    That make sense?...sounded right when I was thinking about it anyway.


  4. The Following User Says Thank You to JesseJamesDallas For This Useful Post:

    Alabama Buckeye (04-09-2022)

  5. #4
    Join Date
    Aug 2019
    Location
    Deer Park, TX
    Posts
    106
    Thanks
    6
    Thanked 27 Times in 23 Posts
    Downloads
    9
    Uploads
    0
    A theoretical "isotropic" antenna puts out a given amount of RF antenna in ALL directions.

    A directional antenna uses passive elements to "bend" or "force" that RF radiation into a desired pattern.
    When speaking of "gain" .... an antenna doesn't "put out any more" power...... it simply uses these extra passive elements to "pull the RF emission shape around so that it is more concentrated in one direction. THAT is where the "gain" comes in.... is the concentration of available RF power in a specific direction.

    One director... will focus it a little bit.
    A second director.... will it a little bit more.
    A third director..... yet a little bit more.

    Each that you add causes a narrowing of the transmitted beam.....but the concentration in THAT direction is stronger... giving more gain and sensitivity.

  6. The Following User Says Thank You to Bobcat For This Useful Post:

    Alabama Buckeye (04-09-2022)

  7. #5
    Join Date
    Mar 2022
    Location
    Cntrl Alabama
    Posts
    145
    Thanks
    7
    Thanked 26 Times in 26 Posts
    Downloads
    1
    Uploads
    0
    In other words, you have to really have to work at it to narrow down the azimuth for those with whom you regularly have intercourse with; and, log your contacts.
    All answers are opinions and may, or may not be technically correct.

  8. #6
    Join Date
    Aug 2019
    Location
    Deer Park, TX
    Posts
    106
    Thanks
    6
    Thanked 27 Times in 23 Posts
    Downloads
    9
    Uploads
    0
    Well.... the more elements.... the more your antenna "focuses" in the forward direction.... so the better you will reach them....and the better you will hear them.

  9. #7
    Join Date
    Feb 2014
    Location
    West coast
    Posts
    177
    Thanks
    0
    Thanked 114 Times in 71 Posts
    Downloads
    0
    Uploads
    0
    I used to use a long john five element beam mounted horizontal with a big stick in the middle. Was able to get directional use from the omni big stick by grounding the driver element for the beam.

  10. #8
    Join Date
    Mar 2022
    Location
    Cntrl Alabama
    Posts
    145
    Thanks
    7
    Thanked 26 Times in 26 Posts
    Downloads
    1
    Uploads
    0
    Five element beams are normally mounted horizontal, what special about your long john? How to you get directional use from the big stick? Grounding the beam driver element, that's a new one for me.
    All answers are opinions and may, or may not be technically correct.

  11. #9
    Join Date
    Aug 2019
    Location
    Deer Park, TX
    Posts
    106
    Thanks
    6
    Thanked 27 Times in 23 Posts
    Downloads
    9
    Uploads
    0
    Sticking my nose in with a WAG........

    Grounding the driven element on the beam would essentially make the whole thing ground.
    Mounting the vertical "in the middle".... I would think that the "beam" would act like a
    "directional ground plane" and distort the omnidirectional pattern of the vertical antenna...making it project a little further in the direction of the beam.

    Again... only a guess.......

Visitors found this page by searching for

None

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •