I should have said the return loss should be "high" or "good" :-)
Bruce Griffiths wrote: > Rick Karlquist wrote: >> Additional specs to consider: >> >> The return loss should be low for 10 MHz and the first 8 harmonics. >> The harmonic distortion should be low. >> The isolation between outputs should be high. >> The phase drift vs temperature should be low. >> The short term stability at 1 second should be good. >> The magnetic field susceptibility should be low. >> Line sidebands should be low. >> >> Compare, for example, the HP5087, a so-so design, to the >> output amplifier design in the 5071A cesium, as documented >> in my FCS paper in 1992. Huge difference in specs. The >> 5071A has 120 dB isolation between outputs. >> >> Rick Karlquist N6RK >> >> >> > Rick > > Did you mean a high return loss or equivalently low reflection > coefficient? > > The layout of the board in the picture is perhaps preliminary the input > signal track to 3 of the output sections is a little too close to > another track. > > Its hard to tell from the low res image but have thick film resistors > been used? > These can have excessive flicker noise thus increasing the close in > phase noise above that possible with thin film resistors. > > Bruce > > _______________________________________________ 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.