Portable HF shortwave antenna, field emergency plan

1、 Core features of the product

1. Structural features

Adopting segmented detachable whip body and external detachable loading inductor, segmented splicing and storage, compact size, portable backpack for carrying; Multi level adjustable loading coil, quickly switching between 3.5-30MHz mainstream shortwave frequency bands without the need for additional large grounding grids. Divided into two mainstream structures: bottom loading and middle loading, fiberglass insulation skeleton, oxygen free copper enameled coil, and waterproof and aging resistant shell.

2. Adaptive power rangeConventional adaptation to mainstream portable shortwave radio stations of 10W and 25W, with optimized models capable of carrying up to 50W transmission power in a short period of time; The overall standing wave control SWR at the factory is ≤ 1.5, and high-end tuning can reach within 1.2, reducing RF reflection loss.

3. Flexible and diverse installation

Free switching between two installation modes: upright vertical installation and inclined V-shaped dipole installation; Grassland, sand and gravel, desert, and mountainous areas can all be quickly deployed; When the ground conditions are poor, a simple radiation grid can be used to improve radiation efficiency.

4. Environmental tolerance advantage

Lightweight stainless steel oscillator with anti bending properties; The coil housing is made of high temperature resistant engineering plastic, which is resistant to ultraviolet rays, moisture, and dust, and is suitable for extreme outdoor environments such as plateaus, Gobi, and rainforests.

2、 Core usage functions

1. Ground wave short-range communication

Vertical installation mode, relying on surface wave propagation, emergency communication in the 5-20km area, and communication among field teams.

2. Skywave beyond line of sight long-distance communication

Diagonal V-shaped installation, optimized elevation angle, utilizing ionospheric reflection, achieving cross regional communication of hundreds to thousands of kilometers during the window period, assisting in field distress and long-distance communication with the main force.

3. Multi band compatible for FM use

Adjustable loading inductance, a set of antennas covering all commonly used amateur shortwave frequency bands, eliminating the need for multiple antennas to be carried repeatedly. It is a backup communication equipment for hiking, camping, and unmanned area exploration.

4. Ground adaptive compensation function

The impedance of two environments, land and concrete ground, can be corrected by increasing or decreasing the number of grounding cables; Narrow space, bare rock ground without large areas of soil, can work normally with a small amount of radial grounding wire.

3、 Brief description of the advantages and disadvantages of car mounted HF antennas

Advantages: fast disassembly and assembly, strong mobility, deployment not limited by vehicles, independent use in case of field disconnection; Shortcomings: The overall radiation gain is lower than that of fixed vehicle mounted antennas, and the communication distance is slightly shorter under the same power. The fluctuation is also affected by the conductivity of the soil surface.