An active antenna (with long cable) on the windowsill is probably best, adding distance between the GPS antenna and RF noise of the MCU and other devices.
Type: Posts; User: manitou
An active antenna (with long cable) on the windowsill is probably best, adding distance between the GPS antenna and RF noise of the MCU and other devices.
Does your GPS have an external antenna with a good view of the sky? Satellite lock may be intermittent and PPS erratic without external antenna.
Some discussion of GPS PPS and Teensy crystal...