What kind of capacitor is used for the 10 µF cap - electrolytic or film?
Bill Hawkins
-Original Message-
From: Nick Sayer via time-nuts
Sent: Monday, September 26, 2016 11:18 PM
With a short TC loop filter, the PLL does lock up, but obviously the
jitter of the Venus 10 MHz output comes
Is there a schematic showing what you attempted?
I went back through the discussion thread and it was not real clear to
me which design you implemented.
On Mon, 26 Sep 2016 21:18:25 -0700, you wrote:
>...
>
>The results arent very good.
>
>With a short TC loop filter, the PLL does lock up, but
At the risk of inviting everyone to say “I told you so,” I’ll report here my
experimental results from trying this concept out.
Since there was a great deal of doubt about the outcome, I hedged my bet a bit
and designed for the DOT050V rather than the OH300. If it worked out for the
TCXO, then
> On Sep 16, 2016, at 1:13 PM, Lars Walenius wrote:
>
>
>
> My experience with the Venus838-T is only 2 weeks but disappointing. This can
> also be guessed from the datasheet ADEV curve, that I guess is sawtooth
> corrected values as it starts at 3E-9 at 1s, but is only 1E-11 at 1000s a
> f
Hi Lars. I own a G3RUH (Miller) GPSDO.
>From what I can recall While testing mine with my collection of
>HP5370B's and my assortment of references the performance of mine while locked
>was generally comparable to the one in the link you provided. I never tested
>it "un locked."
I c
Hi Nick,
Jim Millers design is very clever and as I see can give results as good as a
digital approach but it has the same limitations:
The GPS jitter and the oscillator jitter in combination with the loop bandwidth.
The only ADEV I have seen for the Miller GPSDO is this one
http://www.leapsec
Bryan wrote:
From the Jupiter-T TU60-D120 datasheet
Figure 1-3 (next page) shows the typical 1PPS performance of the Jupiter-T GPS
receiver. The 10 kHz output is also available from the receiver and is phase
coherent with the 1PPS signal. This output is made available for functions such
as
csteinm...@yandex.com said:
> The fact that one thing is phase-locked to another does not necessarily
> mean it puts out a good, clean signal. At short time scales (tau less than
> ~100 seconds), the PPS signal from any GPS receiver is noisy. At tau =
> 1second, it is shockingly noisy (~5e-9),
Nick wrote:
Ok. Is it the case that the loop filter bandwidth is related to the time
constant?
They are two ways of expressing the same thing, with the proviso that TC
applies strictly only to first-order, linear time-invariant systems --
in electronics, circuits with with one real pole.
of crystal oscillators, frequency synthesisers, and similar
applications.
-=Bryan=-
> Date: Mon, 12 Sep 2016 21:00:51 +
> From: b...@evoria.net
> To: nsa...@kfu.com; time-nuts@febo.com
> Subject: Re: [time-nuts] A new take on the all-hardware GPSDO concept
>
> Nick sai
Tim wrote:
You know Nick, the loop time constant typically used with the HMC1031 loop
filter is typically 5 milliseconds. I'm sure some bigger R's and C's can
used for a longer time constant, and I'm sure that'll help clean up the
awful 10MHz output of the Venus838LPx-T. But it is hardly what I'
Nick said:
"Jim Miller's 10 kHz GPSDO that’s been referenced here has either solved this
problem, or the 10 kHz output of the Jupiter is substantially better than the
Venus’ 10 MHz output, or the design doesn’t give the results time-nuts expect
from a GPSDO. Which of those applies?"
Hi Nick,
You
> On Sep 12, 2016, at 1:27 PM, Charles Steinmetz wrote:
>
> Tim wrote:
>
>> You know Nick, the loop time constant typically used with the HMC1031 loop
>> filter is typically 5 milliseconds. I'm sure some bigger R's and C's can
>> used for a longer time constant, and I'm sure that'll help clean
> On Sep 12, 2016, at 1:01 PM, Bob Camp wrote:
>
> Hi
>
> The noise performance of the HMC1031 close in is pretty horrible. It’s
> actually *worse* than the GPS signal noise. In a normal GPSDO the idea is to
> use an oscillator that is cleaner at 0.01 to 10 Hz than the GPS.
I don’t see wher
Hi
The noise performance of the HMC1031 close in is pretty horrible. It’s actually
*worse* than the GPS signal noise. In a normal GPSDO the idea is to use an
oscillator that is cleaner at 0.01 to 10 Hz than the GPS.
Bob
> On Sep 12, 2016, at 2:41 PM, Nick Sayer via time-nuts
> wrote:
>
>
You know Nick, the loop time constant typically used with the HMC1031 loop
filter is typically 5 milliseconds. I'm sure some bigger R's and C's can
used for a longer time constant, and I'm sure that'll help clean up the
awful 10MHz output of the Venus838LPx-T. But it is hardly what I'd call a
"GPSD
I was talking with someone at AD about a question I had about one of their
TinyDACs when they mentioned their HMC1031 chip. It looks like the ideal
building block for a clean-up oscillator.
It struck me just a touch later that the Venus838LPx-T has by default a 10 MHz
output that’s phase locked
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