Cdsenet TX230-TB-300 230MHz VHF Sucker Antenna 5.0dBi SMA-J 3m RG58

62.2mm Magnetic Sucker Base — Instant Metal-Surface Deployment

The 62.2mm diameter magnetic base provides a secure, tool-free mount on any ferromagnetic metal surface, simultaneously acting as a ground plane to optimize the antenna's radiation pattern and maximize the 5.0 dBi gain. Suitable for vehicle rooftops, equipment cabinets, and industrial enclosure lids. The base can be repositioned without leaving residue, supporting rapid field deployment and redeployment.

SMA-J Connector with 3m RG58 Low-Loss Coaxial Cable

The standard SMA-J (male, inner pin) connector mates directly with SMA-K female ports on industrial wireless modules and APs. The 3-meter RG58 coaxial feeder provides sufficient routing distance between the antenna mounting point and the host device, with measured insertion loss of approximately 1.5 dB at 230MHz over the full cable length. The cable is UV-resistant and rated for outdoor use.

Measured with a vector network analyzer (Agilent E5071C equivalent): VSWR = 1.29 @ 230 MHz, confirming ≤1.5 across the full 210–260 MHz operating band. Return loss ≥ 17 dB at center frequency.

Q: Does the TX230-TB-300 need to be frequency-matched to my wireless module?

A: Yes. The TX230-TB-300 is tuned for 210–260MHz (center 230MHz) and must be paired with a wireless module operating in this VHF band. Using it with a 433MHz or 915MHz module will result in severe impedance mismatch, high VSWR, and significantly reduced communication range. Always verify your module's operating frequency before selecting an antenna.

Q: Can the antenna be mounted on a non-metallic surface?

A: The magnetic base requires a ferromagnetic metal surface to adhere and to function as a ground plane. Mounting on plastic, wood, or fiberglass will prevent the base from holding and will degrade radiation performance, potentially reducing gain by 2–3 dBi. For non-metallic surfaces, a separate metal ground plane sheet (minimum 200 × 200mm) placed under the base is recommended.

Q: What is the SMA-J connector standard and is it compatible with my device?

A: SMA-J (also written SMA Male or SMA-plug) has an inner pin and outer thread. It mates with SMA-K (SMA Female / SMA-jack) ports found on most industrial wireless modules, routers, and APs. Confirm your device has an SMA-K (female) port before ordering. SMA and RP-SMA connectors are not interchangeable — RP-SMA reverses the pin/socket arrangement.

Q: What is the operating temperature range and is the cable suitable for outdoor use?

A: The TX230-TB-300 is rated for -40°C to +85°C. The 3m RG58 cable jacket is UV-resistant and suitable for outdoor deployment. The antenna itself is not independently IP-rated; for rain or high-humidity environments, ensure the SMA connector junction is protected with self-amalgamating tape or a weatherproof boot to prevent moisture ingress.

Q: Why does VHF 230MHz provide better range than 433MHz or 915MHz in some environments?

A: Lower VHF frequencies (210–260MHz) experience less free-space path loss and better ground-wave propagation compared to UHF bands. In open rural, agricultural, and low-obstacle environments, 230MHz antennas can achieve 20–40% greater effective range than 433MHz antennas at equivalent power levels. This makes the TX230-TB-300 particularly suitable for wide-area IoT deployments where obstacle penetration and long-range coverage are priorities.