The **FTS-14-R/Q** typically refers to a high-precision, space-qualified Quartz Crystal Oscillator (OCXO) or a frequency timing system component, often produced by manufacturers like **Microchip (formerly Microsemi/Symmetricom)**. These components are designed for high-reliability environments such as satellites, aerospace, and deep-space missions. --- ### 1. Key Technical Specifications Below is a breakdown of the typical electronic characteristics for the FTS-14 series: | Feature | Specification (Typical) | | :--- | :--- | | **Component Type** | Quartz Crystal Oscillator (OCXO) | | **Frequency Range** | Usually 5 MHz to 10 MHz (standard) | | **Aging Rate** | $< 5 \times 10^{-11}$ per day | | **Temperature Stability** | $\pm 1 \times 10^{-10}$ over operating range | | **Supply Voltage** | +12V or +15V DC | | **Output Waveform** | Sine wave or CMOS/TTL compatible | | **Radiation Tolerance** | Often rated for TID (Total Ionizing Dose) > 100krad | --- ### 2. Functional Electronic Sections #### A. The Quartz Resonator (The "Q") The "Q" suffix usually denotes the **Quartz** element. In the FTS-14, this is typically a **SC-cut (Stress Compensated)** crystal. * **Why SC-cut?** It offers superior thermal stability and is less sensitive to mechanical shock and vibration compared to standard AT-cut crystals. #### B. The Oven Control (The "R") The "R" often refers to the **Resonator/Oven assembly** or specific ruggedization. * **Proportional Control:** The electronics include a heating circuit that keeps the crystal at a specific "turning point" temperature (usually around 75°C to 85°C) where its frequency-vs-temperature slope is zero. * **Thermal Mass:** The internal assembly is vacuum-sealed or insulated to prevent external ambient temperature fluctuations from affecting the internal frequency. #### C. Power Management & Tuning * **Voltage Regulation:** High-precision internal regulators ensure that noise on the input power line does not translate into "phase noise" on the output signal. * **EFC (Electronic Frequency Control):** A varactor-based circuit allows the user to fine-tune the output frequency via an external control voltage to compensate for long-term aging. --- ### 3. Application Areas Because of its extreme stability and radiation hardening, the FTS-14-R/Q is used in: * **Satellite Transponders:** Maintaining carrier frequency for communication. * **GPS/GNSS Ground Stations:** Providing ultra-stable reference clocks. * **Deep Space Probes:** Where replacement is impossible and the environment is harsh. --- ### 4. Part Number Breakdown (General) While exact prefixes can vary by manufacturer, the code usually breaks down as: 1. **FTS:** Frequency Timing System (Series). 2. **14:** Specific Model/Frame size. 3. **R:** Ruggedized / Radiation Hardened. 4. **Q:** Quartz Stabilized. ---