On Thu, December 17, 2015 3:47 pm, John Miles wrote: > Those spurs are reminiscent of what happens when you lift the ground of a > coax cable at one end and turn it into an antenna, in my experience.
This came up several weeks ago, I don't remember whether an original TADD-1 or some other distribution amp, where I pointed out that the measurements provided were with the board connectors run on two short pigtails to panel mount connectors which were mounted side by side on a metal enclosure. I think the question was why was there so much more noise on the measurements done with the cables just hanging off the PCB. With the layout of the new board shown any shield currents are going to flow right across the PCB from the input connector to the output connectors, causing voltage fluctuations across the ground plane. A better layout would be to have the power and input connectors on the same side of the PCB as the output connectors, and make provision for all of the connectors to be snugged down tight to a metal enclosure, or at least a metal plate, so that any parasitic currents flowing on the shields can stay on the shields and won't be forced across the PCB. -- 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.