WINDOM OCF DIPOLE

Discussion in 'Survey Center' started by W5RJW, Feb 1, 2010.

?

best dipole antenna:

Poll closed Feb 2, 2010.
  1. Flat Top

    85.7%
  2. Inverted V

    0 vote(s)
    0.0%
  3. Invertel L

    14.3%
Multiple votes are allowed.
Thread Status:
Not open for further replies.
ad: L-HROutlet
ad: l-rl
ad: L-MFJ
ad: Subscribe
ad: abrind-2
ad: Left-3
ad: Left-2
ad: l-BCInc
  1. KI4TWB

    KI4TWB Ham Member QRZ Page

    The original Windom antenna was fed with a single wire and was worked against good ground. It appeared similar to the OCF dipole because they are both fed at the 1/3 point. http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=15689 The two are NOT the same. Windom =/= OCF Dipole.

    The BALUN you'll need for the OCF will depend on the height you can hang it. Up to about 40 feet or so, a 4:1 will work fine. At 50-60 feet, you'll need a 6:1. In any case, you WILL need a 1:1 BALUN immediately below the other BALUN, or you'll have more RF in the shack than you'll be able to shake a buddistik at.:)
     
  2. W5LDA

    W5LDA Ham Member QRZ Page

    I dont use a 1:1 under my 4:1 and I have no RF. I think it depends on how you erect it whether you need the 1:1 or not.
     
  3. W5DXP

    W5DXP Ham Member QRZ Page

    What is the magnitude of the common-mode current at the input of your tuner when you are outputting 100 watts?
     
  4. W6ECE

    W6ECE Ham Member QRZ Page

    Isn't any piece of wire a dipole at some frequency?
     
  5. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    Yep!

    And if my grandmother had wheels, she'd be a bus.
     
  6. AC0FP

    AC0FP Ham Member QRZ Page

    If I had a OCF dipole, I would feel like Don Quixote but instead of fighting windmills I would be fighting to keep RFI out of my shack! :eek:

    fp
     
  7. PA5COR

    PA5COR Ham Member QRZ Page

    No problems with R.F. from my Fritzel OCF AMA 83 FD-4 antenna, lengthened it with coil and 30 feet for 160 meters flat top at 45 feet.
    Not even using 1 Kw in the antenna.
    The balun has 1:6 and is followed by a 1:1 unun.

    Except 15/30 all other bands are lower as 1:3, no tuner needed.

    And yes, my space is limited 2/3 and 1/3 fits the space here even when i have 165 feet of wire in the air.

    Though for 160 meters and 10/12/15/17 i also have vertical antenna's up.
     
  8. KB0OU

    KB0OU Ham Member QRZ Page

    Off Center Fed "Dipole"

    Howdy,
    I don't care what ya want to call it.
    My antenna is fed at about the 1/3 length and is cut for 160 metres.
    It loads up good and people hear me when I speak, especially when I hit it with about 1200 watts at the antenna.
    I use a big 4:1 balun rated for 3KW. I do not use a 1:1 and have not had RF problems in the shack even running full legal limit power.

    I call it my Off Center Fed Dipole or "that there wire antenna up there on the tower" depending on who I am talking to and how smart they are.
    Sometimes I have to point at it because it is not the only antenna around.

    73
    John kb0ou
     
  9. KB3QJA

    KB3QJA Ham Member QRZ Page

    Off Center Fed

    I use a "dipole" (two elements) fed not at the center which was cut for half wave 80 meters. I like the multiband capability which off center feeding facilitates. The original Windom was fed with a single wire which was part of the radiator. I feed mine with coax into homebrew air core 1:1 and then 4:1 current balans. I have been well satisfied with the DX performance of this simple wire antenna.
    73
    mike-KB3QJA
     
Thread Status:
Not open for further replies.

Share This Page