18
June
2024
Antenna for "Fox Hunt" at 144.7 MHz
15:10

Antenna for "Fox Hunt" at 144.7 MHz

,
18 June 2024 15:10

This antenna is designed for "Fox Hunt" on cars, the frequency of the lighthouse 144.7 MHz. I realized it. Coordination using Hairpin from wire.

Antenna No. 1: "Uda-yagi" 5 elements for frequency 144.7 MHz

Material - tube with a diameter of 8 mm.

Antenna for "Fox Hunt"

Coordination Hairpin-Match: 51+20+51mm = 122 mm without taking into account "ears", from wire with a diameter of 2 mm. Input resistance 52 Ohms.

Dimensions:

Element R D1 D2 D3
Position, MM 0 222 316 578 1077
length, MM 1042 984 964 916 800

Coordination increases input resistance and reduces resonance frequency.

Diagram:
DN1

I assembled and used this antenna.

Antenna No. 2: "Uda-Yagi" 5 elements for frequency 145.5 MHz (recalculated)

Antenna for"охоты на лис"

Coordination Hairpin-Match: 50+20+50mm = 120 mm excluding "ears", from wire with a diameter of 2 mm. Input resistance 59 Ohms.

Dimensions:

Element R D1 D2 D3
Position, MM 0 220 314 575 1071
length, MM 1036 974 958 910 796

Coordination Hairpin-Match: 51+20+51mm = 122 mm

Diagram:
DN2

Hairpin-Match device:

Hairpin
            ___
            | |
================= x x =======================
          Power node
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Archive with models for the MMANA Antennas Modeling Program:
*[Foxhunt.zip](foxhunt.zip)


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