[time-nuts] New topics (was Re: He is a Time-Nut Troublemaker....)
John Ackermann N8UR
jra at febo.com
Tue Dec 23 16:40:51 UTC 2008
Magnus Danielson wrote:
> My intent is to get some stuff done in the lab during the vacation.
> (Desperatly trying to get some more on-topic discussions going).
Here are two questions that have been running around my head:
1. Following on from the discussion last week about trying to
synchronize multiple oscillators to improve phase noise, I've wondered
about a simpler tack: take, for example, two 5 MHz atomic standards and
mix their outputs together, using the 10 MHz result to drive a time
scale. Assuming the standards were of relatively equal quality, would
this provide a better time scale than using one of the standards alone?
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?
Happy holidays!
John
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