4 CH GPSDO Board: Arduino Based, Neo-M8N Controlled, CTI OSC5A2B02 100mm X 120mm

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Neo-M8N, Arduino Nano, CTI OSC5A2B02:Neo-M8N, Arduino Nano, CTI OSC5A2B02

I have for your consideration, this new, Arduino based 4 Channel GPSDO. It uses a UBLOX Neo-M8N GPS to control a CTI OSC5A2B02 OCXO. The OCXO is wrapped with foam insulation to minimize thermal variation. Since the OCXO’s are used, I purchase them in bulk, test each one, and only use units that have no observable jitter when measured on an oscilloscope. This is a new build using US sourced (Mouser) components and shipped from the USA. This 10 MHz Sine Wave Reference Signal can be used to control 4 of your frequency-based test equipment or radios. It has an exceptionally clean, low phase noise signal that is accurate to approximately 0.001Hz. The PCB measures in at 100mm x 120mm. The unit requires a DC power supply providing 12v-15v @ 1A (The unit draws ~0.6A during warmup and ~0.3A thereafter). A 12V DC PS is recommended. The PLL control is accomplished using an Arduino Nano that can alternatively be powered and monitored via computer using a USB-C connection (Important: Unit still needs DC Power for the OCXO/GPS and requires removal of the Nano PWR jumper to bypass the 8v LVR). Using Arduino IDE software, you can monitor the output performance characteristics and make adjustments to the gain and other parameters. (Note: this requires knowledge of Arduino programming and GPS control systems but is not necessary for use.) Simply plug in the unit, allow the GPS to obtain a lock, and the device is ready for use. I’ve also added serial data ports for both the GPS and Arduino. A USB-to-TTL adapter can connect to the GPS to monitor satellite telemetry (using Ucenter software) and to the Arduino to monitor and change the PLL control system. To clarify:  Config1: Power to Arduino/GPS/OCXO thru DC Power Supply (Jumper On), Monitor GPS/Arduino thru Serial Data Ports Config2: Power to GPS/OCXO thru DC Power Supply, Power/Monitor Arduino thru USB-C (Jumper OFF), Monitor GPS thru Serial Data Port For those familiar with GPSDO designs, this is an implementation of the excellent “Lars GPSDO” and there is extensive information about the design available on the internet. I’ve spent a lot of time and created several versions of this design, and this is my most robust and best performance configuration. It has individual Linear Voltage Regulation circuits for the GPS, OCXO, and Arduino to isolate each from the other to prevent current surges from impacting performance. It can be installed directly into any frequency-based test equipment as an integrated reference source or mounted in an enclosure and used as a standalone reference (A 2mm gap is provided on the sides to clear enclosure slots). To setup for use: connect and place antenna in area with good view of the sky and plug in the unit. Once the GPS locks onto several satellites and the OCXO warms up (~15 minutes) the reference signal will self-calibrate, and the “GPS Lock” LED will light up. The GPSDO can then be used. LED Status: Blinking: Acquiring satellite lock Off: Satellite lock completed, acquiring OCXO lock Solid: GPS & OCXO locked, ready for use What’s included: GPSDO, GPS antenna. What’s NOT included: any additional hardware shown for demonstration purposes (frequency counters, oscilloscopes, etc). Anything not specifically listed in “What’s included “ Design Goals: Maximize Performance & Utility

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