[time-nuts] Tight PLL method. Is it good enough?

Bob Camp lists at rtty.us
Fri Jun 4 18:23:38 EDT 2010


Hi

What do you want to test?

What do you want to do with the results?

What are you going to compare them against?

What range of measurements are you interested in?

The DMTD will look at two atomic clocks on the same frequency and the reference "drops out" in the processing. Is that important to you?

Do you have / need to have a method of testing the tester? 

Lots of "what if's" that need to be considered. 

Bob


On Jun 4, 2010, at 5:48 PM, John Green wrote:

> I am a relative outsider to this fine group. I mostly just read the posts. I
> have learned a lot since I have subscribed.
> So, I don't have a dog in the fight over whether the tight PLL method is all
> Warren says it is. I can understand that Warren
> has researched this method, discovered its weakness and made advancements to
> compensate. He has tested it against
> a well known and respected piece of commercial gear and found good, though
> not perfect agreement. An achievement to be
> proud of. Bruce has also researched this method and sees that it has
> weaknesses. Some of which he feels Warren has not
> addressed. He is frustrated because Warren won't agree that there are
> problems with this method.
> As someone who merely wants to test some oscillators, I am mainly interested
> in finding components I can buy and assemble
> into something I can have a modicum of confidence in. I was looking at doing
> a DMTD setup because I have most of the
> necessary components. But Warren has gotten my attention. By testing it
> against a piece of commercial equipment, he has
> gotten me to believe that if I build a similar setup, I can achieve similar
> results. The interesting thing is that his setup is relatively
> simple. I could probably duplicate it pretty closely. Is it perfect?
> Probably not. Would it do what I need done? Probably so.
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