[time-nuts] Advantages & Disadvantages of the TPLL Method

John Miles jmiles at pop.net
Tue Jun 15 17:14:12 UTC 2010

I was surprised at the lack of it in this case.  The 10811s are usually
fairly vulnerable to it; you certainly can't feed two of them into the mixer
on a 3048A without using isolation amps.  But then, the loop BW is about a
thousand times wider in the TPLL than in a traditional loose-PLL phase noise
test set.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Bob Camp
> Sent: Tuesday, June 15, 2010 4:48 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Advantages & Disadvantages of the TPLL Method
> Hi
> With any phase lock system injection locking can indeed be a
> problem. Since it's dependent both on frequency offset and phase
> angle, checking for it can be tricky. I've seen an unfortunately
> large amount of data where injection locking was the issue. There
> are a number of ways of checking for it, each with their own
> issues (and hardware requirements).
> Bob

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