The **CCR-39SX70-RMS** is a high-performance electromechanical coaxial switch manufactured by Teledyne Relays. It belongs to the **CCR-39 series**, which are designed for applications requiring extremely high frequency (RF) signal routing with low insertion loss and high isolation. --- ### 1. Technical Specifications The following table highlights the core electronic and mechanical parameters of the CCR-39SX70-RMS: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Switch Type** | SPDT | Single Pole Double Throw | | **Frequency Range** | DC to 18 GHz | Supports microwave and RF bands | | **Actuator Voltage** | 28 Vdc | Standard operating voltage for the coil | | **Actuator Type** | Latching | Remains in the last state without continuous power | | **Connector Type** | SMA (Female) | Standard sub-miniature version A connectors | | **Impedance** | 50 Ohms | Standard RF system impedance | | **Special Feature** | Self-Cutoff | Automatically disconnects drive current once switched | --- ### 2. Breakdown of the Model Number The alphanumeric code provides specific details about the component's internal electronics and physical configuration: * **CCR-39S**: Represents the basic series (Coaxial, SPDT, high-performance). * **X**: Indicates a specific mounting or functional option (often referring to the circuitry/logic interface). * **7**: Refers to the **Actuator Voltage** (In Teledyne's nomenclature, 7 usually signifies 28V). * **0**: Standard options for indicators/suppression. * **RMS**: This suffix typically denotes specialized features such as **D-Sub connectors**, **Indicators**, or specific **TTL logic** compatibility depending on the exact sub-catalog datasheet. --- ### 3. Key Electronic Components & Features #### A. Latching Actuator with Self-Cutoff Unlike "Failsafe" switches that require constant power to stay in a specific position, the **Latching** mechanism in this part uses a permanent magnet. Once the pulse is applied, it "clicks" into place and stays there. The **Self-Cutoff** feature is a internal circuit that cuts power to the coil immediately after the switch has moved, preventing overheating and reducing total system power consumption. #### B. RF Performance (The "Business" Side) The internal contact mechanism is designed for "Cold Switching" (though it can handle "Hot Switching" at lower power levels). It utilizes gold-plated contacts to ensure: * **Low Insertion Loss:** Minimal signal degradation as the wave passes through. * **High Isolation:** Prevents signal leakage between the "on" port and the "off" port. #### C. Control Interface The "RMS" configuration often includes a multi-pin connector (like a D-Sub) rather than individual solder pins. This allows for: 1. **Command Pins:** To trigger the latching mechanism. 2. **Indicator Pins:** Feedback circuits that allow an external computer to "read" the physical state of the switch. --- ### 4. Typical Applications * **Satellite Communications:** Switching between primary and redundant amplifiers. * **Automated Test Equipment (ATE):** Routing signals from a Device Under Test (DUT) to various measurement instruments. * **Military Radar:** High-reliability signal path selection.