On Mon, October 12, 2015 9:08 am, Chris Wilson wrote: > I have found when the TX is on at 136kHz the Trimble / divider > baord output goes wild and a clean square wave goes seemingly random > on my scope with noise.
How are your input and output cables physically configured? I noticed on the link that Dave just posted that he uses a divider board inside a conductive enclosure, and the input connectors are fed from short coax cables which have their shields all connected to the same metal panel of the enclosure. The printed circuit board has input and outputs on opposite ends of the board, and the connector shells appear to be connected to the circuit reference conductor, which means that if the input and output cable shields are not close together and connected together electrically very well, all the shield current will be forced to flow across the printed circuit board reference conductor. Perhaps with your transmitter operating so closely it is resulting in a lot of ground bounce at the various components on the divider board. As you say, connecting the 10MHz directly without the divider in place would help confirm or eliminate that possibility. -- Chris Caudle _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.