A run of the mill 2 way power splitter has better than 10ps phase matching at 100MHz there are few digital devices that offer that degree of matching at best they are usually 10x worse.
Bruce > > On 09 July 2017 at 06:58 Mark Sims <hol...@hotmail.com> wrote: > > Yes, they do show up... but usually for big-ish bucks. I want to build a > small affordable replacement that anybody with a 531xx can have. > > My design is currently leaning towards a board with the clock generator > and a 5V reference for the gain calibration (they spec 5V +/- 1mV). I was > going to use a couple of 2P4T slide switches to route open circuit, 5V, > normal clock, and inverted clock to the two output connectors. > > I think the cost to build would be in the $20 range and fit on a 2x2" or > so circuit board... certainly more attractive than a $500 big ancient box > with unobtainium parts in it. The board should be able to perform all the > calibration steps for the counter. > > I don't think the signal requirements are super critical. They are using > 1:2 splitters and splitter/180 degree phase shifters and relays to generate > the output signals passively from the inputs. I think a digital clock > generator would be a LOT more accurate than those phase shifters. > > ---------------- > > > > > > Actually, you can get J06 HP-59992A calibrators on eBay. > > > > _______________________________________________ > > 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. > > > > > _______________________________________________ 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.
