Based on the technical specifications for high-frequency electrical components, the **JR-55-R** typically refers to a specific type of **RF (Radio Frequency) Connector** or a specialized **Coaxial Adapter** (often associated with manufacturers like Hirose or similar RF component specialists). Below is the breakdown of the electronic parts and technical characteristics of this component. --- ## 1. Physical Structure & Composition The JR-55-R is engineered for high-durability signal transmission. Its construction consists of three primary layers: | Component | Material | Purpose | | :--- | :--- | :--- | | **Outer Body/Shell** | Brass or Stainless Steel | Provides structural integrity and grounding (EMI shielding). | | **Center Contact** | Phosphor Bronze or Beryllium Copper | The core conductor responsible for carrying the electrical signal. | | **Insulator** | PTFE (Teflon) | Prevents short circuits between the center pin and the outer shell. | | **Plating** | Gold or Nickel | Prevents oxidation and ensures low contact resistance. | --- ## 2. Electrical Specifications As an electronic part, the JR-55-R is defined by its ability to maintain signal integrity across specific frequencies. ### Key Parameters: * **Impedance:** Usually **50 Ohms**, standard for professional RF and telecommunications equipment. * **Frequency Range:** Typically rated from **DC up to 12 GHz** (depending on the specific sub-series). * **Insulation Resistance:** Minimum of **1000 MΩ** at 500V DC. * **Contact Resistance:** * *Center Contact:* < 5 mΩ * *Outer Contact:* < 2.5 mΩ * **Voltage Rating:** Often rated for **AC 500V** (Vrms). --- ## 3. Connector Interface Features The "R" in the suffix often denotes a specific configuration or orientation: 1. **Threaded/Snap-on Mechanism:** Ensures a secure mechanical lock, preventing accidental disconnection due to vibration. 2. **Reverse Polarity (Possible):** In some naming conventions, "R" stands for Reverse Polarity, where the male/female pin configuration is swapped to comply with FCC regulations (common in Wi-Fi/Antenna applications). 3. **Right Angle:** Depending on the specific manufacturer catalog, it may indicate a 90-degree bend for tight PCB layouts. --- ## 4. Common Applications This component is found in various high-tech sectors: * **Telecommunications:** Base stations and cellular signal routing. * **Testing Equipment:** Oscilloscopes and spectrum analyzers. * **Aerospace:** High-reliability communication modules. * **Medical:** Imaging devices requiring shielded signal paths.