| Spec Category | Parameter Dimension | Technical Specifications (Ebyte TX490-JK-11) |
| Basic Info | Antenna Type | Bendable Rubber Sleeve Antenna (Glue Stick) |
| Physical Height | Approximately 108 mm | |
| Structural Feature | Hinged/Bendable design (multi-angle adjustment) | |
| RF Specs | Operating Frequency | 490 MHz (Sub-GHz Band) |
| Nominal Gain | 2.5 dBi | |
| Standing Wave Ratio | Under 1.5 | |
| Input Impedance | 50 Ohm | |
| Hardware | Connector Interface | SMA-J (SMA Male / Internal thread inner pin) |
| Radiation Pattern | Omnidirectional (360-degree coverage) |
Practical Application Scenarios
Scenario 1: Smart Water Metering and Utility AMR Networks
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Regional Industry Pain Points: Municipal automated meter reading (AMR) systems in underground pits or concrete enclosures face severe signal attenuation. Utilizing crowded 2.4GHz Wi-Fi is impossible due to poor obstacle penetration, while rigid straight antennas are easily sheared off or blocked when utility boxes are tightly sealed.
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Ebyte Technical Solution: The TX490-JK-11 operates on the highly penetrative 490MHz sub-GHz frequency, which easily cuts through concrete walls and soil barriers. Its flexible, bendable rubber hinge allows installation engineers to tilt the antenna at a 90-degree angle to fit within ultra-shallow utility cabinets, securing a stable link back to the central data concentrator.
Scenario 2: Remote Agricultural Soil and Irrigation Node Telemetry
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Regional Industry Pain Points: Agricultural sensor nodes deployed across vast crop fields require low-power, long-range communication. Rigid antennas are highly susceptible to physical damage from farm machinery, wind, and wildlife.
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Ebyte Technical Solution: Paired with Ebyte’s low-power 490MHz wireless modules, the TX490-JK-11 provides robust, omnidirectional 360-degree coverage. Its rugged rubber sleeve is designed to bend and absorb impacts from farming equipment or animals without breaking. The sub-GHz 490MHz signal propagates over long distances through dense crop canopies where 2.4GHz signals would scatter and fail.
Scenario 3: Industrial Wireless Remote Controllers and Overhead Crane Operations
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Regional Industry Pain Points: Overhead factory crane operators rely on handheld wireless remotes. If the handheld device uses a rigid, protruding antenna, dropping the controller frequently breaks the RF connector, disabling the machine and creating safety hazards.
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Ebyte Technical Solution: The TX490-JK-11 is highly compact (108mm) and lightweight, making it ideal for handheld industrial remotes. Its bendable structure acts as a shock absorber during accidental drops, preserving the integrity of the internal SMA-J connector. Operating on the clean, low-interference 490MHz band ensures low-latency control commands even in heavy metal industrial environments.
FAQ Section
Q1: What does the SMA-J connector type mean for hardware compatibility?
A1: The SMA-J designation represents a standard SMA Male connector, which features an internal thread with a center male pin. This is highly compatible with the standard SMA-K (SMA Female with outer thread and inner receptacle) connectors found on most industrial wireless modules, routers, and RF boards.
Q2: Can this antenna be used for standard 2.4GHz or 5GHz Wi-Fi networks?
A2: No. The TX490-JK-11 is strictly tuned to operate at the 490MHz sub-GHz frequency. Attempting to use it with 2.4GHz or 5GHz Wi-Fi systems will result in a very high Standing Wave Ratio (SWR), causing severe signal loss and potentially damaging your Wi-Fi router's transmitter due to excessive reflected RF power.
Q3: Why is an SWR under 1.5 important for my battery-powered IoT devices?
A3: An SWR under 1.5 indicates that the antenna is impedance-matched to 50 ohms with high precision, reflecting less than 4 percent of the transmitted signal back to the source. For battery-powered field terminals, this maximizes power transmission efficiency, extending communication range and preserving battery life by preventing energy waste.
Q4: Does the bendable hinge affect the RF performance of the antenna?
A4: No. The mechanical hinge allows you to rotate and tilt the antenna at 45-degree or 90-degree angles to optimize polarization and fit space-constrained enclosures. The internal coaxial feedline is structurally shielded to maintain consistent impedance and RF performance regardless of the physical bending angle.
