The **CCT-39S669-R** is a high-performance, broadband coaxial switch manufactured by **Teledyne Relays**. It belongs to the **CCT-39S** series, which are typically SP6T (Single Pole, Six Throw) electromechanical switches designed for high-frequency RF applications. --- ### 1. General Specifications These switches are engineered for durability and signal integrity in demanding environments like telecommunications, instrumentation, and automated test equipment (ATE). | Feature | Specification (Typical) | | :--- | :--- | | **Switch Type** | SP6T (Single Pole, Six Throw) | | **Frequency Range** | DC to 18 GHz (some variants up to 26.5 GHz) | | **Actuator Type** | Normally Open (Failsafe or Latching depending on suffix) | | **Voltage** | 24V - 28V DC | | **Connectors** | SMA (Female) | | **Impedance** | 50 Ohms | --- ### 2. Key Electronic Components & Mechanisms #### A. The Actuator System The "heart" of the CCT-39S669-R is an electromagnetic solenoid system. When voltage is applied to a specific pin, the magnetic field moves an internal armature, which physically pushes a contact leaf to close the RF path. * **Normally Open:** In this configuration, all ports are disconnected from the common port until power is applied. * **Indicator Circuitry:** The "R" in the part number often signifies the inclusion of **Indicators**. These are internal auxiliary contacts that allow a control system to verify electronically that the switch has physically moved to the desired position. #### B. RF Contact Assembly The internal RF paths are gold-plated to ensure low insertion loss and high repeatability. * **Insertion Loss:** Typically < 0.5 dB at 18 GHz. * **Isolation:** Usually > 60 dB, preventing signal leakage between inactive ports. * **VSWR:** Kept below 1.5:1 to minimize signal reflection. #### C. Control Interface The device uses a multi-pin connector (usually a D-sub or circular header) for control signals. * **Suppression Diodes:** Most modern Teledyne switches include internal diodes to suppress "back EMF" (voltage spikes) that occur when the solenoid coil is de-energized, protecting the user's driver electronics. * **TTL Logic (Optional):** Depending on the exact sub-configuration, these may include a TTL driver, allowing the switch to be toggled using 5V logic signals instead of high-current 28V pulses. --- ### 3. Application Use Cases 1. **RF Matrix Switching:** Routing a single signal source to one of six different antennas or test points. 2. **Signal Selection:** Choosing between six different input frequencies to be sent to a single receiver. 3. **Redundancy Switching:** Used in satellite ground stations to switch to a backup amplifier if the primary fails. --- ### 4. Part Number Breakdown (CCT-39S669-R) * **CCT-39S:** Series designation (Commercial, SP6T, SMA Connectors). * **6:** Denotes the number of positions (6-throw). * **6:** Often refers to the Actuator Voltage (e.g., 28Vdc). * **9:** Defines specific options like TTL, Decoders, or Moisture Seals. * **R:** Indicates **Indicators** included for feedback.