On 10/1/2016 6:54 PM, Bob Stewart wrote:
OK, I give up. My participation in this thread is over.
Bob
-
Why?
You asked some questions and several people have tried to help you. I think one
issue is that you mention measuring pha
t; Bob
> -
> AE6RV.com
>
> GFS GPSDO list:
> groups.yahoo.com/neo/groups/GFS-GPSDOs/info
>
> From: Bob Albert
> To: Discussion of precise time and frequency measurement
> ; Bob Stewart
> Sent: S
: [time-nuts] Measuring phase with an HP 3456A?
On 10/1/2016 5:13 PM, Bob Stewart wrote:
> Hi Bob Albert,
>
> Completely eliminate the use of the term "DMTD". I didn't post that.
Actually you did in your first post.
"I've been spending a small amount of my
On 10/1/2016 5:13 PM, Bob Stewart wrote:
Hi Bob Albert,
Completely eliminate the use of the term "DMTD". I didn't post that.
Actually you did in your first post.
"I've been spending a small amount of my time looking into making a sort of
hybrid DMTD with a pair of DBMs"
_
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AE6RV.com
GFS GPSDO list:
groups.yahoo.com/neo/groups/GFS-GPSDOs/info
From: Bob Albert
To: Discussion of precise time and frequency measurement ;
Bob Stewart
Sent: Saturday, October 1, 2016 6:46 PM
Subject: Re: [time-nuts] Measuring phase with an HP
From: Bob Albert
> To: Discussion of precise time and frequency measurement
> ; Bob Stewart
> Sent: Saturday, October 1, 2016 6:46 PM
> Subject: Re: [time-nuts] Measuring phase with an HP 3456A?
>
> I am having trouble following this thread. I assume we are trying to
re, and this will
need software in any case.
Bob
-
AE6RV.com
GFS GPSDO list:
groups.yahoo.com/neo/groups/GFS-GPSDOs/info
From: Bob Albert
To: Discussion of precise time and frequency measurement ;
Bob Stewart
Sent: Saturday, October 1, 2016 6:46 PM
Subject: Re: [time-nuts]
I don't think I can attach two 10MHz inputs to
> a soundcard and expect anything useful.
>
> Bob
>
>
>
> From: Bob Camp
> To: Bob Stewart ; Discussion of precise time and frequency
> measurement
> Sent: Saturday, October 1, 2016 6:24 PM
>
ery test on the code and hardware changes to get a reliable
> 1PPS from my GPSDO, so there is some very slow movement over the range of 0
> to 100ns.
>
> Bob
>
> From: Bob Camp
> To: Bob Stewart ; Discussion of precise time and frequency
> measurement
> Sent: S
From: Bob Camp
To: Bob Stewart ; Discussion of precise time and frequency
measurement
Sent: Saturday, October 1, 2016 6:24 PM
Subject: Re: [time-nuts] Measuring phase with an HP 3456A?
HI
DMTD = Dual Mixer Time Difference
Single Mixer = what is commonly used for most things.
Discussion of precise time and frequency
> measurement
> Sent: Saturday, October 1, 2016 3:14 PM
> Subject: Re: [time-nuts] Measuring phase with an HP 3456A?
>
> Hi
>
> What is the beat note coming out of the DMTD?
>
> Put another way:
>
> DMTD involves three o
y, October 1, 2016 3:14 PM
Subject: Re: [time-nuts] Measuring phase with an HP 3456A?
Hi
What is the beat note coming out of the DMTD?
Put another way:
DMTD involves three oscillators. Two are on roughly the same frequency and the
third is
offset from the other two. The difference fr
Hi
What is the beat note coming out of the DMTD?
Put another way:
DMTD involves three oscillators. Two are on roughly the same frequency and the
third is
offset from the other two. The difference frequency is typically something like
10 Hz.
It does not *have* to be 10 Hz, but that is one w
Bob,
Just try it. Compare it and see how the initial noise slope behaves and
compare it to other measurements.
Similar phase-measurement setups have been used in historic context.
What ends up being the best method for you is a combination of what
tools you have available and dare to bring i
I've been spending a small amount of my time looking into making a sort of
hybrid DMTD with a pair of DBMs up front feeding the stereo input to a sound
card. So, I got the 100KHz LPF back from Oshpark and hooked it up to my scope
for verification - an obvious step. Then I hooked it up to my 34
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