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- Energy gain: 25 ± 0.6 dBi
- Beam width: 8.5°
- Connector: R-SMA
- Dimensions: Ø 68 cm
- Polarization: Vertical/horizontal
- Energy gain: 18.8 ±1.0 dBi
- Beam width: 15°/15°
- Cable connector: R-SMA
- External dimensions: 326 x 326 x 113 mm / Internal dimensions: 309 x 309 x 88 mm
- Polarization: Horizontal and vertical
- Energy gain: 18.8 ±1.0 dBi
- Beam width: 15°/15°
- Cable connector: MMCX
- External dimensions: 326 x 326 x 113 mm / Internal dimensions: 309 x 309 x 88 mm
- Polarization: Horizontal and vertical
81,39
EUR
including 23.00% VAT
Antennas operating in the 3.5 MHz frequency are essential components for anyone wishing to effectively operate in the popular 80-meter band (3.5–3.8 MHz). This band, characterized by good propagation both during the day (over shorter distances) and at night (for longer, international connections), requires carefully selected and optimized antennas to fully utilize its potential.
Advantages of 3.5 MHz Antennas:
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Versatility: The 80-meter band is extremely versatile, enabling both local and long-distance (DX) connections, especially during nighttime hours. 3.5 MHz antennas are crucial for effectively utilizing this versatility.
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Good Nighttime Propagation: At night, the 80-meter band opens up to long-distance, national, and even international connections, often exhibiting stable propagation without the sudden signal dropouts typical of higher bands.
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Less QRM/QRN interference: Compared to higher-frequency shortwave bands, the 80-meter band is often less susceptible to local electromagnetic interference (QRM) and atmospheric noise (QRN), which can improve reception comfort for weak signals.
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Multi-mode operation: These antennas perform well in a variety of modes, including SSB (single sideband), CW (telegraphy), FT8/FT4 (digital), and RTTY, allowing for a wide range of activities.
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A foundation for beginners and advanced operators: 3.5 MHz antennas are an excellent starting point for beginners learning the principles of antenna construction and tuning, as well as advanced operators striving to optimize their stations.
What to consider when choosing a 3.5 MHz antenna?
Choosing the right 3.5 MHz antenna is a key decision that will impact the performance of your station. Here are the most important factors to consider:
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Available Space: Antennas for the 80-meter band are physically long (a quarter-wave dipole is about 20 meters long per arm). Consider how much space you have available to mount the antenna.
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Antenna Type
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Mounting Height: The higher the antenna is mounted, the better its performance will be, especially for DX. Mounting height also affects the radiation angle.
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Materials and Build Quality: Antennas are exposed to weather conditions. Choose models made of durable, corrosion-resistant materials for long service life.
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Resonance and SWR (Standing Wave Ratio): Ensure the antenna is designed to resonate within the desired 3.5 MHz band. A good SWR (close to 1:1) is crucial for efficient power transfer from the transceiver to the antenna and protection of the output stage. It's worth investing in an SWR meter or antenna analyzer.
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Maximum Power: Check that the antenna is rated for the power you plan to use (e.g., 100W for standard transceivers, higher for power amplifiers).
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Grounding: For vertical antennas and some other antenna types, the quality of the grounding or counterweight system is critical to their performance.
