[time-nuts] New topics (was Re: He is a Time-Nut Troublemaker....)

Joe Gwinn joegwinn at comcast.net
Wed Dec 24 21:52:50 UTC 2008


At 5:05 PM +0000 12/23/08, time-nuts-request at febo.com wrote:
>Date: Tue, 23 Dec 2008 11:40:51 -0500
>From: John Ackermann N8UR <jra at febo.com>
>Subject: [time-nuts] New topics (was Re: He is a Time-Nut
>	Troublemaker....)
>To: Discussion of precise time and frequency measurement
>	<time-nuts at febo.com>
>
>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:
>
>[snip]
>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?

Why the aversion to coax delay lines?  They are simple and reliable. 
The reason will help people to tell what alternatives would be best.

Joe




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