{"product_id":"tx230-jk-11-230mhz-vhf-rubber-antenna-2-5dbi-sma-j","title":"Cdsenet TX230-JK-11 230MHz VHF Rubber Antenna 2.5dBi SMA-J 110mm IoT","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; color: #333; line-height: 1.6; max-width: 1000px; margin: 0 auto; padding: 10px;\"\u003e\n\n  \u003csection style=\"margin-bottom: 40px;\"\u003e\n    \u003ch2 style=\"font-size: 24px; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 20px;\"\u003eProduct Overview\u003c\/h2\u003e\n    \u003cp style=\"font-size: 16px; color: #444; margin-bottom: 20px;\"\u003eThe \u003cstrong\u003eTX230-JK-11\u003c\/strong\u003e is a 230MHz VHF omnidirectional rubber stick antenna engineered for direct-mount use on wireless RF modules, handheld terminals, and industrial IoT devices. It delivers a measured \u003cstrong\u003epeak gain of 2.5 dBi\u003c\/strong\u003e and an exceptionally low typical VSWR of \u003cstrong\u003e1.09 at 230MHz\u003c\/strong\u003e — corresponding to a return loss of approximately 26 dB — across the \u003cstrong\u003e225–237MHz\u003c\/strong\u003e operating band. The flexible rubber radome allows the 110mm antenna to be bent to various mounting angles without damaging the internal radiator, making it suitable for panel-mount and handheld device installations. Updated March 2026.\u003c\/p\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0702\/9918\/9350\/files\/TX230-JK-11.png?v=1774864462\" alt=\"TX230-JK-11 230MHz VHF omnidirectional rubber stick antenna with SMA-J connector\" loading=\"lazy\" decoding=\"async\" style=\"display: block; margin: 0 auto; max-width: 100%; height: auto; border-radius: 8px;\"\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"margin-bottom: 40px;\"\u003e\n    \u003ch2 style=\"font-size: 22px; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 15px;\"\u003eTechnical Specifications\u003c\/h2\u003e\n    \u003cdiv style=\"overflow-x: auto;\"\u003e\n      \u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px; text-align: left; border: 1px solid #ececec;\"\u003e\n        \u003cthead\u003e\n          \u003ctr style=\"background-color: #f9f9f9; border-bottom: 2px solid #eee;\"\u003e\n            \u003cth style=\"padding: 12px; font-weight: bold; color: #333;\"\u003eParameter\u003c\/th\u003e\n            \u003cth style=\"padding: 12px; font-weight: bold; color: #333;\"\u003eValue\u003c\/th\u003e\n          \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n          \u003ctr style=\"border-bottom: 1px solid #f0f0f0;\"\u003e\n            \u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eFrequency Range\u003c\/td\u003e\n            \u003ctd style=\"padding: 12px;\"\u003e225 – 237 MHz (Center: 230 MHz ± 5 MHz)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"border-bottom: 1px solid #f0f0f0; background-color: #fafafa;\"\u003e\n            \u003ctd style=\"padding: 12px; font-weight: 600;\"\u003ePeak Gain\u003c\/td\u003e\n            \u003ctd style=\"padding: 12px;\"\u003e2.5 dBi\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"border-bottom: 1px solid #f0f0f0;\"\u003e\n            \u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eVSWR\u003c\/td\u003e\n            \u003ctd style=\"padding: 12px; font-weight: bold; color: #c0392b;\"\u003e≤ 1.5 (Typ. 1.09 @ 230 MHz — return loss ≈ 26 dB)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"border-bottom: 1px solid #f0f0f0; background-color: #fafafa;\"\u003e\n            \u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eImpedance\u003c\/td\u003e\n            \u003ctd style=\"padding: 12px;\"\u003e50 Ω\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"border-bottom: 1px solid #f0f0f0;\"\u003e\n            \u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eConnector Type\u003c\/td\u003e\n            \u003ctd style=\"padding: 12px;\"\u003eSMA-J (SMA Male, nickel-plated)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"border-bottom: 1px solid #f0f0f0; background-color: #fafafa;\"\u003e\n            \u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eAntenna Height\u003c\/td\u003e\n            \u003ctd style=\"padding: 12px;\"\u003e110 mm (radius: 8 mm)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"border-bottom: 1px solid #f0f0f0;\"\u003e\n            \u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eRadiation Pattern\u003c\/td\u003e\n            \u003ctd style=\"padding: 12px;\"\u003eOmnidirectional (vertical polarization)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"border-bottom: 1px solid #f0f0f0; background-color: #fafafa;\"\u003e\n            \u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eMax Input Power\u003c\/td\u003e\n            \u003ctd style=\"padding: 12px;\"\u003e10 W\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"border-bottom: 1px solid #f0f0f0;\"\u003e\n            \u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eOperating Temperature\u003c\/td\u003e\n            \u003ctd style=\"padding: 12px;\"\u003e-40 °C to +85 °C\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"border-bottom: 1px solid #f0f0f0; background-color: #fafafa;\"\u003e\n            \u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eCompliance\u003c\/td\u003e\n            \u003ctd style=\"padding: 12px;\"\u003eRoHS\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr style=\"background-color: #fafafa;\"\u003e\n            \u003ctd style=\"padding: 12px; font-weight: 600;\"\u003eLast Updated\u003c\/td\u003e\n            \u003ctd style=\"padding: 12px;\"\u003eMarch 2026\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"margin-bottom: 40px;\"\u003e\n    \u003ch2 style=\"font-size: 22px; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 25px;\"\u003eProduct Details\u003c\/h2\u003e\n    \u003cdiv style=\"background: #ffffff; border: 1px solid #eee; border-radius: 8px; padding: 20px; margin-bottom: 20px;\"\u003e\n      \u003ch3 style=\"font-size: 18px; color: #111; margin: 0 0 10px 0;\"\u003eFlexible Rubber Radome — Bend-to-Angle Mounting\u003c\/h3\u003e\n      \u003cp style=\"font-size: 14px; color: #666; margin-bottom: 15px;\"\u003eThe rubber radome allows the 110mm antenna body to be bent to various angles (typically 0°–90°) without damaging the internal radiator or degrading RF performance. This flexibility is particularly useful for panel-mount installations where a vertical antenna would protrude excessively, or for handheld terminals where the antenna must fold flat during transport. The rubber material also provides mechanical protection against accidental impact in field environments.\u003c\/p\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0702\/9918\/9350\/files\/TX230-JK-11-1.png?v=1774864462\" alt=\"TX230-JK-11 flexible rubber radome bend-to-angle mounting for 230MHz VHF panel-mount device\" loading=\"lazy\" decoding=\"async\" style=\"max-width: 100%; height: auto; display: block; margin: 0 auto; border-radius: 4px;\"\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background: #ffffff; border: 1px solid #eee; border-radius: 8px; padding: 20px;\"\u003e\n      \u003ch3 style=\"font-size: 18px; color: #111; margin: 0 0 10px 0;\"\u003eNickel-Plated SMA-J Connector — 50Ω Precision Interface\u003c\/h3\u003e\n      \u003cp style=\"font-size: 14px; color: #666; margin-bottom: 15px;\"\u003eThe nickel-plated SMA-J (male, inner pin) connector provides a corrosion-resistant, 50Ω impedance-matched interface to SMA-K female ports on 230MHz wireless modules, handheld transceivers, and industrial IoT gateways. The precision-machined connector body minimizes signal reflection at the antenna-module junction, contributing to the measured VSWR of 1.09 — one of the lowest values achievable in a direct-mount rubber antenna at VHF frequencies. Rated for repeated mating cycles in field-serviceable installations.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"margin-bottom: 40px;\"\u003e\n    \u003ch2 style=\"font-size: 22px; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 20px;\"\u003eProfessional Test Report\u003c\/h2\u003e\n    \u003cdiv style=\"background-color: #f8fbff; border: 1px solid #e1ecf7; border-radius: 8px; padding: 20px; text-align: center; margin-bottom: 20px;\"\u003e\n      \u003cp style=\"font-size: 15px; color: #1e3a8a; margin-bottom: 15px;\"\u003eMeasured with \u003cstrong\u003eAgilent E5071C\u003c\/strong\u003e vector network analyzer: VSWR = \u003cstrong\u003e1.09 @ 230 MHz\u003c\/strong\u003e, confirming ≤1.5 across the full 225–237 MHz operating band. Return loss ≈ 26 dB at center frequency — indicating that less than 0.25% of input power is reflected at the antenna port.\u003c\/p\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0702\/9918\/9350\/files\/TX230-JK-11-2.png?v=1774864462\" alt=\"TX230-JK-11 VSWR test chart 230MHz measured with Agilent E5071C network analyzer VSWR 1.09\" loading=\"lazy\" decoding=\"async\" style=\"max-width: 100%; height: auto; border-radius: 4px;\"\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background-color: #f8fbff; border: 1px solid #e1ecf7; border-radius: 8px; padding: 20px; text-align: center;\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0702\/9918\/9350\/files\/TX230-JK-11-3.png?v=1774864462\" alt=\"TX230-JK-11 radiation pattern test chart 230MHz VHF rubber antenna omnidirectional vertical polarization\" loading=\"lazy\" decoding=\"async\" style=\"max-width: 100%; height: auto; border-radius: 4px;\"\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"margin-bottom: 40px;\"\u003e\n    \u003ch2 style=\"font-size: 22px; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 25px;\"\u003eIdeal Applications\u003c\/h2\u003e\n    \u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 20px;\"\u003e\n      \u003cdiv style=\"flex: 1 1 220px; min-width: 200px; border: 1px solid #f0f0f0; border-radius: 10px; padding: 15px; background: #fff;\"\u003e\n        \u003ch3 style=\"font-size: 16px; margin: 0 0 8px 0; color: #0056b3;\"\u003e230MHz Wireless RF Modules\u003c\/h3\u003e\n        \u003cp style=\"font-size: 14px; color: #666; margin: 0;\"\u003eDirect-mount antenna for 230MHz data transmission modules, handheld wireless terminals, and VHF band transceivers with SMA-K female ports.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1 1 220px; min-width: 200px; border: 1px solid #f0f0f0; border-radius: 10px; padding: 15px; background: #fff;\"\u003e\n        \u003ch3 style=\"font-size: 16px; margin: 0 0 8px 0; color: #0056b3;\"\u003eIndustrial IoT \u0026amp; Telemetry\u003c\/h3\u003e\n        \u003cp style=\"font-size: 14px; color: #666; margin: 0;\"\u003eRemote sensing nodes, industrial telemetry systems, and low-power IoT sensor networks operating in the 230MHz VHF band for long-range data acquisition.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1 1 220px; min-width: 200px; border: 1px solid #f0f0f0; border-radius: 10px; padding: 15px; background: #fff;\"\u003e\n        \u003ch3 style=\"font-size: 16px; margin: 0 0 8px 0; color: #0056b3;\"\u003eSmart Metering \u0026amp; Utility\u003c\/h3\u003e\n        \u003cp style=\"font-size: 14px; color: #666; margin: 0;\"\u003eWireless water, gas, and electricity meter reading systems using 230MHz VHF for reliable long-range uplink in urban and suburban utility infrastructure.\u003c\/p\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1 1 220px; min-width: 200px; border: 1px solid #f0f0f0; border-radius: 10px; padding: 15px; background: #fff;\"\u003e\n        \u003ch3 style=\"font-size: 16px; margin: 0 0 8px 0; color: #0056b3;\"\u003eAgricultural \u0026amp; Environmental Monitoring\u003c\/h3\u003e\n        \u003cp style=\"font-size: 14px; color: #666; margin: 0;\"\u003eWide-area sensor networks for soil, weather, and irrigation monitoring using 230MHz sub-300MHz VHF for improved ground-level propagation over long distances.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"margin-bottom: 40px;\"\u003e\n    \u003ch2 style=\"font-size: 22px; color: #111; border-bottom: 2px solid #eee; padding-bottom: 10px; margin-bottom: 25px;\"\u003eResources\u003c\/h2\u003e\n    \u003ca href=\"https:\/\/www.cdebyte.com\/pdf-down.aspx?id=1235\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"display: inline-block; padding: 12px 25px; background-color: #0056b3; color: #fff; text-decoration: none; border-radius: 6px; font-weight: 600; font-size: 15px;\"\u003e📄 Download Datasheet (PDF)\u003c\/a\u003e\n  \u003c\/section\u003e\n\n  \u003csection style=\"border-top: 1px solid #eee; padding-top: 30px;\"\u003e\n    \u003ch2 style=\"font-size: 20px; color: #111; margin-bottom: 20px;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n    \u003cdiv style=\"margin-bottom: 20px; padding: 15px; background: #fafafa; border-radius: 8px;\"\u003e\n      \u003cp style=\"font-weight: bold; margin-bottom: 6px;\"\u003eQ: Is the TX230-JK-11 compatible with all 230MHz wireless modules?\u003c\/p\u003e\n      \u003cp style=\"color: #555; margin: 0; font-size: 14px;\"\u003eA: The TX230-JK-11 is tuned for 225–237MHz (center 230MHz ± 5MHz) and is compatible with any 230MHz wireless module featuring an SMA-K (female) port. Confirm your module operates within this narrow band before ordering — modules operating at 220MHz or 240MHz may fall outside the optimized range and experience higher VSWR. For broader 210–260MHz coverage, consider the TX230-TB-300 sucker antenna instead.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"margin-bottom: 20px; padding: 15px; background: #fafafa; border-radius: 8px;\"\u003e\n      \u003cp style=\"font-weight: bold; margin-bottom: 6px;\"\u003eQ: What does a VSWR of 1.09 mean in practical terms?\u003c\/p\u003e\n      \u003cp style=\"color: #555; margin: 0; font-size: 14px;\"\u003eA: A VSWR of 1.09 corresponds to a return loss of approximately 26 dB, meaning less than 0.25% of the transmitted power is reflected back from the antenna port. This is exceptionally close to a perfect impedance match (VSWR = 1.0) and indicates that virtually all transmitter power is radiated. In practical terms, this minimizes stress on the transmitter PA stage and maximizes effective radiated power for the given gain of 2.5 dBi.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"margin-bottom: 20px; padding: 15px; background: #fafafa; border-radius: 8px;\"\u003e\n      \u003cp style=\"font-weight: bold; margin-bottom: 6px;\"\u003eQ: What is the maximum input power and is it suitable for high-power systems?\u003c\/p\u003e\n      \u003cp style=\"color: #555; margin: 0; font-size: 14px;\"\u003eA: The TX230-JK-11 is rated for a maximum input power of 10W. This covers the output power range of most 230MHz wireless data modules (typically 10–500mW) and low-power transceivers. For systems with transmit power exceeding 10W, use a higher-power-rated external antenna such as the TX230-TB-300 (rated 50W). Exceeding the 10W limit may cause thermal damage to the antenna's internal radiator or connector.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"margin-bottom: 20px; padding: 15px; background: #fafafa; border-radius: 8px;\"\u003e\n      \u003cp style=\"font-weight: bold; margin-bottom: 6px;\"\u003eQ: Can the antenna be bent and will it affect RF performance?\u003c\/p\u003e\n      \u003cp style=\"color: #555; margin: 0; font-size: 14px;\"\u003eA: Yes. The flexible rubber radome allows the antenna to be bent to angles typically between 0° and 90° without damaging the internal radiator. Bending the antenna will alter the radiation pattern — a bent antenna no longer radiates in a purely omnidirectional pattern. For applications requiring a consistent omnidirectional pattern, mount the antenna vertically. Use the bend capability only for space-constrained installations where pattern symmetry is less critical.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"padding: 15px; background: #fafafa; border-radius: 8px;\"\u003e\n      \u003cp style=\"font-weight: bold; margin-bottom: 6px;\"\u003eQ: What is the operating temperature range and is it suitable for outdoor use?\u003c\/p\u003e\n      \u003cp style=\"color: #555; margin: 0; font-size: 14px;\"\u003eA: The TX230-JK-11 is rated for -40°C to +85°C. The rubber radome is weather-resistant and suitable for protected outdoor installations. The antenna is not independently IP-rated; for direct rain or high-humidity exposure, ensure the SMA connector junction is protected with self-amalgamating tape. For fully outdoor deployments requiring IP67 or higher protection, use an externally mounted sucker or fiberglass antenna with a sealed connector.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n\u003c\/div\u003e","brand":"cdsenet","offers":[{"title":"Default Title","offer_id":45301875376230,"sku":"tx230-jk-11","price":1.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0702\/9918\/9350\/files\/TX230-JK-11-_2_800x800_v2.jpg?v=1773986648","url":"https:\/\/cdsenet.store\/products\/tx230-jk-11-230mhz-vhf-rubber-antenna-2-5dbi-sma-j","provider":"CDSENET, Built for the Wireless World","version":"1.0","type":"link"}