2m/440 Dual Band Mobile Antenna

Discussion in 'Mobile Radio' started by KG4YBJ, Jan 30, 2014.

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  1. KS2G

    KS2G Subscriber QRZ Page

    How far are you from the repeater site?
    What's the terrain like -- flat, hilly, mountains?
    50 watts with that antenna should give you fairly good range.
     
  2. KG4YBJ

    KG4YBJ Ham Member QRZ Page

    Where I live now its about 10 miles. From what I am told is that the repeater is on a mountain top. The terrain is pretty much flat but I live in an area that is both country and big city.
     
  3. KS2G

    KS2G Subscriber QRZ Page

    With 50 watts into that antenna you should be having no trouble reaching a repeater site on a mountain (or even not) just 10 miles away.

    Your range should easily be 3 times that distance.
     
  4. NM9K

    NM9K Ham Member QRZ Page

    I have talked 20+ miles on 5 watts with a Larsen NMOQ (1/4 wave on 2 meters) on both 2 meters and 440.
     
  5. KG4YBJ

    KG4YBJ Ham Member QRZ Page

    Thanks for the help guys. One thing I love about Ham radio is that everyone is very helpful.
     
  6. KJ6LXX

    KJ6LXX Ham Member QRZ Page

    It possibly could be the location. Mounting on the bumper isn't the best place.
    The higher the better. Lip on top of the door, roof, rack. Try something temporary up higher and see if it helps.

    7 3
     
  7. KD3NE

    KD3NE Ham Member QRZ Page

    Best place to mount antenna .... top and center of roof.

    Anything else brings loss to the install.

    I believe there is a 2db loss going from the roof to the trunk like and also a change in pattern.

    Going lower just makes it worse.

    Here is a link to an excellent document from LARSEN

    http://www.repeater-builder.com/antenna/pdf/larsen-mobile-antennas.pdf


    This might be hard to read but it is in the above document ......

    [​IMG]

    This is another good page .....

    http://ve2rmp.blogspot.com/2011/10/mobile-antenna-placement.html







    .
     
    Last edited: Mar 2, 2014
  8. KG4YBJ

    KG4YBJ Ham Member QRZ Page

    I think I got it all worked out. It seems to be an issue with our repeater. The issues I have with mounting it on the roof of my truck is: 1.) Drilling a hole in the roof of a $40K vehicle and 2.) my truck is 7Ft Tall and my garage door is 7.5 FT tall.
     
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