Hal Murray said the following on 12/23/2008 01:58 PM: >> 2. Several measurement techniques require a given phase relationship >> (e.g., quadrature) between DUT and reference. For HF frequencies (ie, >> 5 or 10 MHz) is there a *practical* phase shifter design covering >> 180+ degrees that doesn't involve switching various lengths of coax >> in and out of the line? > > PLL up by a factor of N, use that to drive a DDS, then filter. Maybe a pair > of DDSes will get better tracking. > > For each possible phase offset, you need N slots in the table. (N/4 with > more work)
If doing phase noise or short term stability measurements, wouldn't the noise of the DDS impact the results? _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
