[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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