The **FTS-7G-R/Q** series refers to high-precision, oven-controlled quartz crystal oscillators (OCXO) or specialized timing modules, typically manufactured by companies like **Fox Electronics** or related timing component specialists. These parts are engineered for applications requiring extreme frequency stability over a wide temperature range. --- ### 1. Key Technical Specifications The "R/Q" suffix usually denotes specific variations in frequency stability or temperature range. Below are the typical specifications for this series: | Parameter | Typical Value | Notes | | :--- | :--- | :--- | | **Nominal Frequency** | 10.000 MHz / 20.000 MHz | Standard telecommunication frequencies | | **Package Style** | Through-hole (DIP) | Often a 5-pin or 4-pin metal can | | **Supply Voltage** | 3.3V or 5.0V DC | Requires stable DC input | | **Frequency Stability** | ±50 ppb to ±100 ppb | Parts-per-billion (extremely precise) | | **Operating Temp** | -40°C to +85°C | Industrial grade | | **Output Type** | CMOS / Sine Wave | Depends on specific model | --- ### 2. Internal Electronic Components These modules are not simple crystals; they are complex circuits contained within a shielded metal housing: * **SC-Cut Quartz Crystal:** Often uses "Stress-Compensated" crystals which are less sensitive to mechanical and thermal shock compared to standard AT-cut crystals. * **Heating Element (Oven):** An internal thermistor and power transistor act as a heater to keep the crystal at a constant "turn-over" temperature (usually around 75°C-80°C). * **Automatic Gain Control (AGC):** Ensures the oscillation remains consistent even as the internal environment changes. * **Varactor Diode:** Used in the "Q" or "Voltage Control" versions to allow for fine-tuning of the frequency via an external control voltage (VCTCXO functionality). --- ### 3. Pinout Configuration While pinouts can vary by manufacturer, the FTS-7G series generally follows this standard layout: 1. **V_c (Voltage Control):** Input to adjust the frequency. 2. **Reference Voltage:** Output for use with a potentiometer. 3. **Supply Voltage (Vcc):** Power input for the oscillator and heater. 4. **RF Output:** The high-stability clock signal. 5. **Ground (GND):** Common ground and case shield. --- ### 4. Common Applications Due to their high stability, these parts are used in: * **Base Stations:** Synchronizing cellular networks (4G/5G). * **Satellite Communications:** Precise timing for signal up/downlinks. * **Test & Measurement:** Internal reference clocks for frequency counters and spectrum analyzers. ---