[time-nuts] New topics (was Re: He is a Time-Nut Troublemaker....)
Hal Murray
hmurray at megapathdsl.net
Tue Dec 23 18:58:58 UTC 2008
> 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)
--
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