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Frequency and Whip!?

  • 13-05-2018 06:07PM
    #1
    Sam Quentin
    Registered Users, Registered Users 2 Posts: 2,236 ✭✭✭


    Are those online whip length to radio frequency calculators accurate and is frequency between 66-88 called Medium Wave or Low Band??
    I'm taking about car aerial/whip and not base. And also if I use a mag mount do I measure from magnet base(roof of car)or just measure the actual whip/antenna??


Comments

  • #2
    humaxf1
    Registered Users, Registered Users 2 Posts: 865 ✭✭✭humaxf1


    Simply divide 300 by the frequency in MHz which gives a full wave-length. Mobile whip lengths are usually 1/4 wave, so divide your answer by 4.

    Take the fire-service for example who operate on 84MHz (we'll use 84.4375 as an example)

    300/84.4375= 3.55 meters. 3.55/4= 0.888m or 88.8cm.

    For transmitting, round it up to maybe 95cm and trim the length for SWR. Measure from the point where the whip leaves the stud.

    66-88MHz is known as low-band VHF


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