The optimal combination scheme for off-road fleet connectivity

Standard configuration: VHF144MHz 5/8 wavelength high gain vertical antenna (preferred for fleet communication)

1. Power selection

10W is suitable for short distance fleet formation; 25W is suitable for large-scale cluster travel in Gobi and wilderness areas. Advantages: Excellent radio wave diffraction ability, strong adaptability to canyon, hill, and desert environments, effective communication in open areas up to 8-25km. The antenna has a built-in shock-absorbing spring structure to resist off-road bumps and impacts; Overall sealed, waterproof and sand proof, resistant to extreme temperature differences.

2. Advanced upgrade UV dual band integrated antenna

Taking into account the high-frequency use of UHF in urban dense forests, one vehicle is suitable for multi scenario travel.

Long distance crossing high-end combination: VHF daily formation+CB27/HF loaded shortwave antenna dual system

VHF is responsible for real-time command and intercom of the close range fleet; CB/HF shortwave relies on ionospheric skywave propagation, serving as an unmanned area beyond line of sight emergency communication, capable of achieving hundreds of kilometers of long-distance distress and cross regional communication, filling the gap in line of sight communication distance; The shortwave antenna adopts a segmented loading coil design, which shortens the overall height of the antenna and is suitable for vehicle installation.

Optimal installation criteria

1. Optimal position: Installed in the center of the roof, using the body metal to form a natural mirror network, with the lowest standing wave and maximum radiation efficiency;

2. The rear side of the roof is the second best option; The side mounted rearview mirror must be equipped with a feeder choke coil to eliminate common mode current and stabilize standing waves;

3. Two sets of antennas are arranged diagonally, with a spacing of ≥ 1 meter between them, to avoid antenna coupling interference.

Feeder matching standard, full link 50 Ω impedance matching

RG58 coaxial cable is selected within 6 meters; Long line cabling and long-distance crossing in the western region use LMR400 low loss feeders to reduce transmission losses; The cable avoids sharp corners and bends, and the joint is fully waterproof and sealed.

Three optimization designs exclusive to deserts

Shock absorption and buffering base, static discharge structure of the base, and noise reduction through magnetic ring filtering of the circuit; Strictly control SWR ≤ 1.5 at the factory, and keep it within 1.2 for high-end products, effectively reducing power reflection loss.