The code **PCTMBPTSM-RPSM** refers to a high-frequency RF (Radio Frequency) coaxial cable assembly. To understand the electronic parts involved, we must break down the nomenclature, which typically follows industry standards for connector types and cable specifications. --- ## 1. Breakdown of Components This part number describes an assembly consisting of two connectors and a specific type of coaxial cable. | Component Code | Description | Electronic Function | | :--- | :--- | :--- | | **PC** | **Power/Performance Cable** | Refers to the specific series of low-loss coaxial cable (often equivalent to LMR-series). | | **TMBP** | **TNC Male Bulkhead Plug** | A threaded connector with a pin; "Bulkhead" indicates it can be mounted through a panel. | | **TSM** | **TNC Straight Male** | A standard TNC male connector (threaded coupling). | | **RPSM** | **RP-SMA Male** | **Reverse Polarity SMA**. A variant of the SMA connector where the gender of the inner pin is swapped. | --- ## 2. Technical Specifications of the Electronic Parts These assemblies are designed for wireless communication systems (WLAN, Bluetooth, GPS, and Cellular). ### A. The Connectors * **TNC (Threaded Neill–Concelman):** A threaded version of the BNC connector. It provides a secure connection that handles vibrations better than bayonet mounts. It typically operates up to **11 GHz**. * **RP-SMA (Reverse Polarity SMA):** Widely used in Wi-Fi equipment. Unlike a standard SMA Male (which has a pin), an RP-SMA Male has a **center sleeve (socket)** but retains the internal threads of a male connector. * **Gold/Nickel Plating:** The contact pins are usually gold-plated to ensure low contact resistance and prevent oxidation. ### B. The Coaxial Cable (The "Pipe") The cable (likely a 195 or 240 equivalent) consists of four layers: 1. **Center Conductor:** Carries the high-frequency signal (usually solid copper or copper-clad aluminum). 2. **Dielectric Insulator:** Maintains the spacing between the conductor and shield to ensure a constant **50 Ohm impedance**. 3. **Shielding:** A combination of aluminum foil and tinned copper braid to prevent EMI (Electromagnetic Interference). 4. **Jacket:** UV-resistant PE or PVC for environmental protection. --- ## 3. Signal Performance Characteristics When using this specific part, the following electronic parameters are critical: * **Impedance:** 50 Ohms (Standard for RF data transmission). * **Frequency Range:** Typically DC to 6 GHz (limited by the RP-SMA and cable attenuation). * **VSWR (Voltage Standing Wave Ratio):** Ideally < 1.35:1 to minimize signal reflection. * **Insertion Loss:** Measured in dB; the longer the cable, the more signal strength is lost. ---