John W: Regarding your Teensy WWVB receiver display issues. The Teensy does not have a source termination resistor on the SPI clock. Add a 50 Ohm resistor (value not critical, anything from 33 to 75 will work) in series with the SPI Clock signal, as physically close to the Teensy as practical. This totally cleared up all of my display issues. https://www.analog.com/media/cn/training-seminars/tutorials/MT-097.pdf Source termination resistors provide a source resistance to absorb the reflection of fast edges off the slave device input, reducing all the bouncing and wiggles on the rising and falling edges of signals, particularly important/beneficial on clock signals.
--- Graham == On Wed, Nov 4, 2020 at 10:55 AM John C. Westmoreland, P.E. < [email protected]> wrote: > Paul/Chris, > > Also - in addition to the white screen, I get this sometimes after running > for a while - have you guys seen this? > > > https://user-images.githubusercontent.com/2308903/98118247-cd4c7b00-1e5f-11eb-8510-aa1ed0beba52.jpg > > 73's, > John > AJ6BC > > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
