GPSDO, sub PPM frequency accuracy in your home lab
Combining very low drift of readily available (second hand) OCXO’s with a GPS-receiver for a calibration grade Frequency reference in your home lab.
Several prototypes of MarME’s design of the GPSDO
Inital Prototypes
For lowest jitter a GPS-receiver dedicated for timing (LEA M8T) was used
GPS Receiver
Measured on a counter with Ultra stable OCXO option a deviation over 900s is shown of only 1.1mHz on 10MHz
10MHz stability
Repair of an HP 8591E spectrum analyzer
MarME obtained a broken HP 8591E, with the message it had a strange glitch in amplitude. This turned into an extensive repair, finding 3 different faults in the same unit. Apart from a fried input attenuator and some strange bodged in resistors, a lot of the calibration trimmers needed new alignment.
Custom R&D
An overview of different R&D projects
Custom Microphone amplifier
For electronic starter signals during track & field events a battery powered amplifier was requested. Gaining and converting single ended signals to differential.
Tube amplifier with NuTube
Preamplifier with multiple inputs using Korg Nutube
Strainmonitoring
Custom project making a wearable used to monitor lower limb impact
Custom R&D-projects
Working together on custom R&D projects respecting your wishes.