BNC Male to TNC Female adapter is an RF (Radio Frequency) coaxial component designed to enable connectivity between devices or cables featuring different connector types. This “between-series” adapter specifically converts a BNC (Bayonet Neill-Concelman) male interface into a TNC (Threaded Neill-Concelman) female interface. It is commonly utilized in scenarios where a TNC-terminated cable or system needs to connect to a BNC-equipped device, or vice versa, providing flexible interconnection without requiring new cable assemblies. Both BNC and TNC connectors are typically standardized at 50 Ohm impedance, ensuring electrical compatibility and minimizing signal reflections. The adapter incorporates the BNC’s familiar quick-connect/disconnect bayonet coupling on one end and the TNC’s robust threaded coupling on the other, offering a secure and stable transition for signals in various RF communication, test and measurement, and wireless applications.
Technical Specification
Here are the typical technical specifications for a BNC Male to TNC Female Adapter:
BNC Male to TNC Female Adapter
1. Electrical Characteristics:
- Impedance: 50 Ohms (Ω) (Both BNC and TNC are predominantly 50 Ohm; 75 Ohm BNC exists but is physically different and would require a corresponding 75 Ohm TNC, which is rare.)
- Frequency Range: DC to 4 GHz (typical), with some precision adapters capable of operating effectively up to 6 GHz.
- VSWR (Voltage Standing Wave Ratio):
- Typically ≤1.25:1 up to 3 GHz
- ≤1.40:1 up to 4 GHz
- Insertion Loss: Low, typically ≤0.15 dB at 3 GHz (minimal signal degradation across the adapter).
- Return Loss: High, typically ≥18 dB at 3 GHz.
- Working Voltage: 500 V RMS (at sea level)
- Dielectric Withstanding Voltage: 1500 V RMS (at sea level)
- Insulation Resistance: ≥5000 M$\Omega$
- Contact Resistance:
- Center Contact: ≤1.0 m$\Omega$ (BNC side), ≤1.5 m$\Omega$ (TNC side)
- Outer Contact: ≤0.5 m$\Omega$ (BNC side), ≤1.0 m$\Omega$ (TNC side)
2. Mechanical Characteristics:
- Connector Type (Input): BNC Male (Plug)
- Connector Type (Output): TNC Female (Jack/Receptacle)
- Mating Interface Standards:
- BNC: Per MIL-STD-348B/301 or IEC 61169-8
- TNC: Per MIL-STD-348B/303 or IEC 61169-17
- Coupling Mechanisms:
- BNC Side: Bayonet (quick connect/disconnect)
- TNC Side: Threaded Coupling (7/16-28 UNEF-2B thread)
- Body Style: Straight adapter
- Durability (Mating Cycles):
- BNC Side: ≥500 cycles
- TNC Side: ≥500 cycles
3. Materials and Finishes:
- Body: Brass, Nickel Plated (typically 100 µin min for corrosion resistance)
- Center Contacts: Brass or Beryllium Copper, Gold Plated (typically 3-50 µin over Nickel for optimal conductivity and wear resistance)
- Insulators: PTFE (Polytetrafluoroethylene / Teflon) for excellent electrical properties and high-temperature performance.
4. Environmental Characteristics:
- Operating Temperature Range: −65∘C to +165∘C (with PTFE insulator)
- Thermal Shock: MIL-STD-202, Method 107, Condition B
- Vibration: MIL-STD-202, Method 204, Condition D
- Mechanical Shock: MIL-STD-202, Method 213, Condition I
- Moisture Resistance: MIL-STD-202, Method 106
- Corrosion (Salt Spray): MIL-STD-202, Method 101, Condition B (48 hours)
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