Thanks group for the replies !
Socket is not an issue in my case, since I soldered wires directly to
it. I am thinking that main reason for the troubles was the power
supply. I was thinking that Vectron 218Y2 is OK for 12V (I have no
documents for that model). And it was OK for period of
Oscillators need a little noise to start up. Usually there's plenty in
almost any circuit, but if you're running cold, or voltage is a little
low, you might not have enough to start.
The mechanical impulse adds noise (crystal = piezoelectric) to the
feedback loop; apparently enough to get it
I was thinking the same as Azelio, I had a Racal 04B OCXO which refused to
start until I reseated the crystal in the socket. After that, well, it's in
almost daily use as a reference in a 1992 counter and has never stopped
since.
On 17 Oct 2017 07:18, "Azelio Boriani" wrote:
> The crystal is soc
The crystal is socketed: the problem might be the socket.
On Tue, Oct 17, 2017 at 1:56 AM, Bob kb8tq wrote:
> Hi
>
> Welcome to the 1990’s … that’s an *old* design. Since Vectron kept building
> same / same
> (if you ordered it that way) who knows when it was built.
>
> Bob
>
>> On Oct 16, 2017
Hi
Welcome to the 1990’s … that’s an *old* design. Since Vectron kept building
same / same
(if you ordered it that way) who knows when it was built.
Bob
> On Oct 16, 2017, at 4:10 PM, Vlad wrote:
>
>
> Hello,
>
> I am wandering if anybody observe the behavior for OCXO, when its stop to
>
I've experienced this with products with simple crystal oscillators. (Ie. Tap
or bang the unit to get the oscillator to start oscillating.)
Mark Spencer
m...@alignedsolutions.com
604 762 4099
> On Oct 16, 2017, at 1:10 PM, Vlad wrote:
>
>
> Hello,
>
> I am wandering if anybody observe the
Sorry, this image
http://www.patoka.ca/Vectron-218Y2/IMG_20171015_193511542.jpg
On Mon, Oct 16, 2017 at 6:22 PM, Jim Harman wrote:
> In your image ...125 it looks like there is a cold solder joint near the
> bottom right, in the second "column" of pads, 3 pads up from the bottom.
>
> On Mon,
In your image ...125 it looks like there is a cold solder joint near the
bottom right, in the second "column" of pads, 3 pads up from the bottom.
On Mon, Oct 16, 2017 at 4:10 PM, Vlad wrote:
>
> Hello,
>
> I am wandering if anybody observe the behavior for OCXO, when its stop to
> reproduce the
Hello,
I am wandering if anybody observe the behavior for OCXO, when its stop
to reproduce the signal, and the only way to return it back to business
is little mechanical stress.
I have TWO of such OCXO. One of them is Austron 11.2 Mhz. And another
one is Vectron model 218Y4442 9.8304Mhz
Hi
A lot depends on how the output stage in the OCXO was designed. Unless
you know the details of “what’s inside” it’s best to terminate it in the
specified
impedance.
One example: Tuned tank in the collector of the output stage driving a matching
network. Terminate it properly and the stage
Moin,
Most OCXOs have a 50Ω output, which suggests that they expect to be
terminated with 50Ω. Now on a normal PCB the wire from the OCXO to
the rest of the circuit is usually rather short (1-5cm) which means
that it is much less than the wavelength of the 10MHz output. Even
when looking reflecti
ta Tue, 25 Jul 2017 10:48:24 -0400
Oggetto [time-nuts] OCXO inside the FEI AN/URQ-23
Has any one run tests of the OCXO inside the AN/URQ-23. Data in the manual
looks promising. Question if it is frequency or ADEV
Bert Kehren
___
time-nu
Bert wrote:
Has any one run tests of the OCXO inside the AN/URQ-23.
I've played with several of the pulled oscillators. They're nothing
special -- xDEV at most frequencies for the ones I've seen is around
5-20x worse than an HP 10811. I tested them after they had been running
for 2-3 week
on Page 9 of the manual [1].
/tvb
[1] http://mil-spec.tpub.com/MIL-T/MIL-T-28816/MIL-T-288169.htm
Original message
From: Tom Van Baak
Date: 7/25/17 11:37 AM (GMT-05:00)
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] OCXO inside the FEI A
Tab® A
Original message From: Tom Van Baak
Date: 7/25/17 11:37 AM (GMT-05:00) To: Discussion of precise time and
frequency measurement Subject: Re: [time-nuts] OCXO inside
the FEI AN/URQ-23
Bert,
In the early days of time-nuts the URQ-10, and especially the URQ-23, were
ge -
> From: "Bert Kehren via time-nuts"
> To:
> Sent: Tuesday, July 25, 2017 7:48 AM
> Subject: [time-nuts] OCXO inside the FEI AN/URQ-23
>
>
> > Has any one run tests of the OCXO inside the AN/URQ-23. Data in the
> manual
> > looks promising. Question
frequency or ADEV".
I'm not sure what you mean. There is no such thing as "frequency" vs. "ADEV".
/tvb
- Original Message -
From: "Bert Kehren via time-nuts"
To:
Sent: Tuesday, July 25, 2017 7:48 AM
Subject: [time-nuts] OCXO inside the FEI AN/UR
Has any one run tests of the OCXO inside the AN/URQ-23. Data in the manual
looks promising. Question if it is frequency or ADEV
Bert Kehren
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listi
Hi Scott,
On 04/12/2017 11:38 PM, Scott Stobbe wrote:
Hello,
I wanted to see if I could soft-start a used OCXO (Trimble 34310) during
warm-up. By default with an appropriately rated 12 VDC supply, the OCXO
starts the heater at about 8 W, and eventually settles down to 2 W for
20-25 degC ambient
On Wed, 12 Apr 2017 20:18:38 -0700, you wrote:
>On 4/12/17 7:14 PM, Richard (Rick) Karlquist wrote:
>> 10.9 MHz is likely the B-mode of the SC cut.
>> (It's a different mode, not a different overtone).
>> This mode has a tempco of 20 ppm and is used
>> to do thermometry.
>>
>> IMHO, there is NO ex
I recognize that unusual start upcharacteristic. I will guess with a rather
high confidence that thatoscillator is made by C-mac / Rakon. I have some C-Mac
CFP04-A1oscillators, and they all exhibit that characteristic. These are newin
the box, actually I wish there was a way to remove the pack
Hi
If your MCU has a POR that resets the internal oscillator that’s an unusual
part. Most
of them I’ve seen simply reset the CPU…..Once the 8 MHz crystal oscillator is
running
at 37 to 53 MHz (or KHz) it may or may not ever return to 8 MHz on it’s own.
Yes, you
need to get into some nutty (as
I can't say I have run into that issue with a MCU as most 21st century ones
have a decent POR and Brown out detect (which typically burns 10x more
current than a 32k XO + RTC, and may get switched off in battery
applications, and then problems can occur). What does seem to come up is
stuff hanging
On 4/13/17 6:17 AM, Bob kb8tq wrote:
Hi
It’s a good bet that there is at least one regulator IC inside any modern OCXO.
As you slowly ramp the input voltage on a regulator, various odd things may
or may not happen. A 1 mv / s ramp on the outside can be “who knows what”
at the oscillator level. T
Hi
It’s a good bet that there is at least one regulator IC inside any modern OCXO.
As you slowly ramp the input voltage on a regulator, various odd things may
or may not happen. A 1 mv / s ramp on the outside can be “who knows what”
at the oscillator level. That said, slow voltage ramps are a re
On 4/12/17 7:14 PM, Richard (Rick) Karlquist wrote:
10.9 MHz is likely the B-mode of the SC cut.
(It's a different mode, not a different overtone).
This mode has a tempco of 20 ppm and is used
to do thermometry.
IMHO, there is NO excuse for the oscillator
designer to design an oscillator that do
10.9 MHz is likely the B-mode of the SC cut.
(It's a different mode, not a different overtone).
This mode has a tempco of 20 ppm and is used
to do thermometry.
IMHO, there is NO excuse for the oscillator
designer to design an oscillator that doesn't
oscillate unconditionally in the right mode.
NO
Hi
A SC cut crystal has multiple resonance “modes” in can operate on. This is in
addition to the
normal set of fundamental, third overtone, fifth overtone and so on. For
various interesting reasons
the SC modes are called A, B and C. On a normal 10 MHz crystal, the “main
mode” is the C mode.
Hello,
I wanted to see if I could soft-start a used OCXO (Trimble 34310) during
warm-up. By default with an appropriately rated 12 VDC supply, the OCXO
starts the heater at about 8 W, and eventually settles down to 2 W for
20-25 degC ambient temperature. Figure Attached.
The good news is it does
Downsizing after my move many items have ended up in the trash. Some will
go on ebay and some I have given away for the cost of shipping on time nuts.
Here are two more. Response please off list.
National Instruments GPIB-PCI card new
Austron 1150 OCXO 5 MHz no EFC tested, will make a nice offs
are good to make them
viable.
Bob
---
GFS GPSDO list:
groups.yahoo.com/neo/groups/GFS-GPSDOs/info
From: Attila Kinali
To: Bob Stewart ; Discussion of precise time and frequency
measurement
Sent: Wednesday, June 29, 2016 10:49 AM
Sub
On Mon, 27 Jun 2016 21:55:55 + (UTC)
Bob Stewart wrote:
> I've had a specific GPSDO running for some time now, and I notice that
> the noise at tau 1s has gotten worse as the retrace flattens out.
> In this case, the ADEV was about 3.6E-11 a month or so ago, and has now
> gone up to about 8
nst the PRS-45A.
Bob
---
GFS GPSDO list:
groups.yahoo.com/neo/groups/GFS-GPSDOs/info
From: John Miles
To: 'Discussion of precise time and frequency measurement'
Sent: Monday, June 27, 2016 7:50 PM
Subject: Re: [time-nuts] OCXO noise as they retrace
>
Hi
For most OCXO’s most certainly not. The typical OCXO improves on ADEV as it
runs. That said, a good OCXO should have a 1 second ADEV
of at least parts in 10^-12 rather than 10^-11. A 5370 should have a floor at 1
second of around 2x10^-11. You may be measuring your counter
doing something st
, 2016 7:06 PM
Subject: Re: [time-nuts] OCXO noise as they retrace
Hi
For most OCXO’s most certainly not. The typical OCXO improves on ADEV as it
runs. That said, a good OCXO should have a 1 second ADEV
of at least parts in 10^-12 rather than 10^-11. A 5370 should have a floor at 1
second of
> I've had a specific GPSDO running for some time now, and I notice that the
> noise at tau 1s has gotten worse as the retrace flattens out. In this case,
> the ADEV was about 3.6E-11 a month or so ago, and has now gone up to about
> 8.5E-11. (Measurements performed by a 5370A against a PRS-45A
I've had a specific GPSDO running for some time now, and I notice that the
noise at tau 1s has gotten worse as the retrace flattens out. In this case,
the ADEV was about 3.6E-11 a month or so ago, and has now gone up to about
8.5E-11. (Measurements performed by a 5370A against a PRS-45A Cs st
Hi
What may well have happened is a part aged quite a bit or failed outright in
all of them. Without
tearing into the circuit, and analyzing it, there is no way to really know.
Bob
> On Jun 20, 2016, at 2:28 PM, Iwa2008 via time-nuts wrote:
>
>
>
> was messing around with one of theocxo's
was messing around with one of theocxo's last night. The most easily way to
guarantee an instantincorrect frequency turn on is to either start it at an
under voltagecondition(ex. initial power on at 10V, with full current), or
tostart it with a current limited power supply, that delivers half
Hi
What you have is an SC cut OCXO that has an incorrectly tuned trap circuit in
it (or
a defective crystal). Of the two I’d bet on the trap. It’s firing up on the
wrong mode and
staying there. It switches back and forth due to interaction between the
limiter stage
and the trap circuit. Ideall
: time-nuts@febo.com
Betreff: [time-nuts] Ocxo wrong frequency.
Has anyone come across oscillators outputting the incorrect frequency when
powered up. The frequency that is outputted reads 10.8 Mhz, and falls a few HZ
as the ocxo warms up. The frequency is stable, even when measured over the
Has anyone come across oscillators outputting the incorrect frequency when
powered up. The frequency that is outputted reads 10.8 Mhz, and falls a few HZ
as the ocxo warms up. The frequency is stable, even when measured over the
course of many hours. It is a repeatable issue, when the ocxo
Hi Magnus,
I wouldn't know how. I don't have the password to the thing, either. I'm not
even sure it can be done.
Bob
On Mon, 5/9/16, Magnus Danielson wrote:
Subject: Re: [time-nuts] OCXO phase pops
To: time-nuts@fe
How does it behave when you run the PRS-45 in open loop?
Cheers,
Magnus
On 05/09/2016 02:43 AM, Bob Stewart wrote:
I started getting phase pops in my testing recently, and I'm pretty sure
they're from the PRS-45A Cs standard. Is this likely to go away after it cooks
some more, or do I need t
Hi
The problem with phase pops inside a control loop is that they can come from a
lot of places. As
long as the loop is still closed they generally track out. That’s not saying
the OCXO is *not* the source,
only that there are other culprits to dig into.
Classic phase pops in an OCXO tend to b
I started getting phase pops in my testing recently, and I'm pretty sure
they're from the PRS-45A Cs standard. Is this likely to go away after it cooks
some more, or do I need to start looking for a new OCXO? It's been running
since January, and has an MTI marked model number 250-0827. The on
Bob wrote:
The Trimble TBolts were made over a long period of time. If you
compare "early" (90's) units to the "late" (~2005) units there are
differences in performance.
If I'm not mistaken, that is largely because they used several
different (part number) OCXOs. I'm not sure it's so much a
I would venture that your unit has a broken SMD part, or a bad
solder joint.
Try using a wooden chopstick, and lightly pressing here and there,
and touching various parts to see what happens.
-Chuck Harris
Artek Manuals wrote:
To further underscore Charles point and to add another dimension to
Hi
The Trimble TBolts were made over a long period of time. If you compare “early”
(90’s) units to the “late” (~2005) units there are differences in performance.
Bob
> On Feb 11, 2016, at 12:16 AM, Charles Steinmetz wrote:
>
> Bob wrote:
>
>> I'll see if I can figure out which of these is r
To further underscore Charles point and to add another dimension to the
discussion.,The Z3801A that I have been working to bring back from
intensive care in the last two weeks is sensitive to a very slight
mechanical shock.
The unit was laying open on the bench with all kinds of test clips
ha
, as I've built only a
> limited number of these units. The normal situation is to retrace downward
> from the start, once initial warmup is over.
>
> Bob
>
> --------
> On Wed, 2/10/16, Tim Shoppa wrote:
>
> Subject: Re:
Bob wrote:
I'll see if I can figure out which of these is retracing the "wrong"
way and put it in a unit. I'll let it cook for a couple of days and
then post a plot. Like I said, these are all Trimble 34310-T,
though I know that there were at least two manufacturers for that
part number. T
Hi Charles,
I'll see if I can figure out which of these is retracing the "wrong" way and
put it in a unit. I'll let it cook for a couple of days and then post a plot.
Like I said, these are all Trimble 34310-T, though I know that there were at
least two manufacturers for that part number. Th
Bob wrote:
I've noticed that a few of these OCXOs continue to retrace upwards
in DAC movement, even after a number of days. I haven't run any of
them for more than a week, as I've built only a limited number of
these units. The normal situation is to retrace downward from the
start, once in
k, as I've built only a limited
number of these units. The normal situation is to retrace downward from the
start, once initial warmup is over.
Bob
On Wed, 2/10/16, Tim Shoppa wrote:
Subject: Re: [time-nuts] OCXO Retrace
To: "Bob Stewa
I think what you are observing, is the detail of how the control loop
transitions from frequency locked to phase locked. And this has more to do
with the divider chain reset and phase detector than anything else.
Note that several of the hobbyist/E-bay GPSDO's (especially the "Chinese
GPSDO") do n
I've been running up a number of OCXOs lately, all Trimble 34310-T. For most
of them, the DAC moves in the negative direction after lock. But there are a
few where the DAC moves more positive. Is this an indication of a different
cut of crystal, or is retrace direction more or less random?
B
This will keep you busy. Nice papers on space-qualified USO (ultra stable
oscillators):
Developments in Ultra-Stable Quartz Oscillators for Deep Space Reliability
http://tycho.usno.navy.mil/ptti/2004papers/paper35.pdf
An Ensemble of Ultra-Stable Quartz Oscillators to Improve Spacecraft Onboard
On Thu, 16 Jul 2015 15:24:08 -0400
"Brian, WA1ZMS" wrote:
> The crystal in the ref osv. came from Bliley. The part number is BG-61. I
> have no idea what the current cost is, but like most very good oscillators
> the crystals were hand sorted and graded.
I had a short chat with Gregory Weaver
I'm not sure what happened to all of the spares, but I do know
that the spare bird was assembled, coddled, polished, and hung
from the ceiling of the Udvar Hazy Air and Space Museum in
Chantilly, Virginia. I think everything is there except for
the RPG, and Tombaugh's ashes. I'm pretty sure it e
Hi
There are some amazing things you can afford to do when you are targeting a <
20 pcs / year market and have
dozens of people to work on the product.
Bob
> On Jul 16, 2015, at 3:24 PM, Brian, WA1ZMS wrote:
>
> The crystal in the ref osv. came from Bliley. The part number is BG-61. I
> ha
The crystal in the ref osv. came from Bliley. The part number is BG-61. I have
no idea what the current cost is, but like most very good oscillators the
crystals were hand sorted and graded.
-Brian, WA1ZMS
iPhone
> On Jul 16, 2015, at 11:17 AM, "John Stuart" wrote:
>
> Here is an interesting
The link below is an updated version of the same paper:
http://www.boulder.swri.edu/~tcase/NH%20RF%20Telecom%20Sys%20ID1369%20FINAL_Deboy.pdf
It has considerably more detail on the RF components as well as the
USO module for which there is an entire page of additional information
and a block diag
On 7/16/15 8:17 AM, John Stuart wrote:
Here is an interesting link to the New Horizons Mission to Pluto radio
system design.
Note last section describes an OCXO with ADEV = 1E-13 at 1s, and aging rate
of <1E-11 per day.
That's no ordinary OCXO. That's a USO made at APL. The crystal is in a
s
Here is an interesting link to the New Horizons Mission to Pluto radio
system design.
Note last section describes an OCXO with ADEV = 1E-13 at 1s, and aging rate
of <1E-11 per day.
http://www.uhf-satcom.com/amateurdsn/Paper-969.pdf
I wonder if their spares will show up on eBay?
John Stua
No PLL there.
10 MHz goes into a ECL gate that creates a 5 ns short pulse, amplified
and the 90 MHz overtone is selected and filtered with tuned crystal filters.
Cheers,
Magnus
On 11/24/2014 03:17 AM, Bob Camp wrote:
Hi
The ADEV of the reference source (OCXO / external reference) will most
Hi,
The on-board TCXO or Option 01 OCXO is either free-running with the
calibrated DAC value or being PLL-locked to the external ref. Either of
those two 10 MHz sources will then be synthesized into 90 MHz. However,
the 90 MHz path has a pretty hefty filtering with crystal filter, so it
shoul
Hi
> On Nov 24, 2014, at 1:47 PM, Don Latham wrote:
>
>
> sorry, Bob, I spaced this one. The dac is indeed a trimpot, and if the
> external source is enabled, the 1:1 pll controls the ocxo through, as you
> thought, a fast loop, about 2 sec t/c and the trimpot dac is not connected.
> The p
sorry, Bob, I spaced this one. The dac is indeed a trimpot, and if the
external source is enabled, the 1:1 pll controls the ocxo through, as you
thought, a fast loop, about 2 sec t/c and the trimpot dac is not connected. The
pll is an ecl phase detector and a pump, very simple. So the “zero
The 90 MHz is multiplied up from the 10 MHz, no pll. Done with a 10 mhz rate
5 ns pulse and a filter chain, followed by a comparator and buffer.
from the manual:
The SR620 has a rear panel input that will accept either a 5 or 10Mhz external
timebase. The SR620 phaselocks its internal timebase to
Hi
The main question is - is there a PLL between the external ref and the OCXO? If
so does it go through the DAC?
If there’s a PLL through the DAC, then bits do matter. If the DAC is simply a
replacement for a trim pot, then it may not matter much at all. The OCXO will
likely age more in a fe
Hi
The ADEV of the reference source (OCXO / external reference) will most
certainly impact the performance of the counter. The device is just comparing
the input signal to the reference. Which ever one has the worse stability will
limit the measurement. At some point (inside the 90 MHz VCXO’s P
No but a little math based on your ocxo's range can help... but measuring
it in person does give you the best numbers.
More precision and more bits WON'T hurt here and the application notes from
the leading crystal makers suggest a DAC front ended by a precision op amp
with and that the xo be foll
>From the manual, I infer the dac is 10 bit. ( 4096 max count) Span is 5 volts.
I've connected the gpsdo and the clock error light does not light; I'm
assuming the morion is locking to the gpsdo OK. I do have the original, was
going to open it up sometime. I suspect something wrong with the heater.
Schematics in KO4BB magnificent storehouse.
Neil Schroeder
> Did we answer the q? about schematics?
>
> All of SRS's products have their block diagram and parts list with a
> detailed circuit description in their user manual. Sneak preview: its all
> resistors.
>
> NS
>
> On Sun, Nov 23, 2014 at
Hi
About the only other question would be the proper resolution for the DAC.
There’s not much of a way to to answer that one without playing with a woking
original OCXO.
Bob
> On Nov 23, 2014, at 7:22 PM, Don Latham wrote:
>
> No question about that. The morion does run a little warmer than
Did we answer the q? about schematics?
All of SRS's products have their block diagram and parts list with a
detailed circuit description in their user manual. Sneak preview: its all
resistors.
NS
On Sun, Nov 23, 2014 at 4:22 PM, Don Latham wrote:
> No question about that. The morion does run
No question about that. The morion does run a little warmer than the old unit
apparently did. Fan is temp-controlled, so I think OK. will monitor box temp
with a digital :-) thermometer, very poor resolution, but probably ok.
When I get the last obs done. will do a little blurb to the group.
Don
B
Hi
That sounds fine. Without knowing just what they did or didn’t do, it’s always
worth being a bit careful.
Bob
> On Nov 23, 2014, at 6:40 PM, Don Latham wrote:
>
> Running very nearly continuously for about 4 days now. The self-measured
> jitter is mean 0 and sdev of 8 ps. I don't think th
Running very nearly continuously for about 4 days now. The self-measured
jitter is mean 0 and sdev of 8 ps. I don't think there is a problem with the
Morion. I'm using my newly acquired cs source and a couple of z3801's for
checking. 1 bit on the SR's frequency calibration dac seems to be about 4-5
Hi
If all the “good stuff” runs on the 90 MHz, the 5 MHz issue may not be
important at all. It’s just something to watch for. If you start seeing data in
two groups, each one 20 ps wide and separated by maybe 200 ps, you are seeing a
problem from the 5 MHz.
Running the box for a while before d
Ah. Got it finally! Doh. Just finished trying out the Morion this afternoon.
Electrically works very well. Used a 7812 to drop the +15 volts from the
option 1 ocxo, there is enough power headroom to bring the Morion up from cold
and run it comfortably. As you said, the control voltage for the orig
Hi
At least the Morion’s I have seen have 5 MHz crystals in them rather than 10
MHz. They have a 10 MHz output due to an internal doubler. Since the circuit is
not perfect, there is cycle to cycle variation in the 10 MHz. It’s way more
jitter (measured in picoseconds) than the oscillator has du
Hi Bob: no. cobble, not double :-) A little research has me thinking I can
easily adapt a morion. I can try it at least by starting with the morion on an
external power supply and patching the output and control voltages in to the
sr.
The sr620 has a control circuit which apparently accomplishes
Hi
I believe that the SR620 uses a “true” 10 MHz OCXO. I would be careful using a
5 MHz doubled to 10 OCXO. The counter may or may not be happy with sub-harmonic
induced jitter.
Best bet at the specs:
+12V power
0-5V EFC
Sine wave out +7dbm
+/- 5x10^-9 0 to 70C
Pinout - trace what you have.
So, I got a reasonable deal on a SR620 ho ho. Know your dealer. The ocxo is
out of tolerance. All self tests pass with flying colors, autocal works as
well. So the best parts are OK.
Does anyone:
1) have a spare Isotemp OCXO36-53 10.000 MHz p/n 6-00051?
2) know the specs, ie the input voltage/cur
mailto:time-nuts-boun...@febo.com] Im Auftrag von Bob
Camp
> Gesendet: Donnerstag, 11. September 2014 00:18
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] OCXO Voltage Input? (Bob Camp)
>
> Hi
>
> If you are modulating a normal OCXO EFC wit
gt;
> -Ursprüngliche Nachricht-
> Von: time-nuts [mailto:time-nuts-boun...@febo.com] Im Auftrag von Bob Camp
> Gesendet: Donnerstag, 11. September 2014 00:18
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] OCXO Voltage Input? (Bob Camp)
>
liche Nachricht-
Von: time-nuts [mailto:time-nuts-boun...@febo.com] Im Auftrag von Bob Camp
Gesendet: Donnerstag, 11. September 2014 00:18
An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] OCXO Voltage Input? (Bob Camp)
Hi
If you are modulating a normal
t;
>> -----Ursprüngliche Nachricht-
>> Von: time-nuts [mailto:time-nuts-boun...@febo.com] Im Auftrag von Bob Camp
>> Gesendet: Sonntag, 7. September 2014 04:21
>> An: Discussion of precise time and frequency measurement
>> Betreff: Re: [time-nuts] OCXO Voltage Inpu
4:21
An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] OCXO Voltage Input? (Bob Camp)
Hi
Simple answer = crystals are never perfect.
Longer winded, but very incomplete answer =
A spurious response in a crystal normally refers to a mode that is not one of
the “i
n Bob Camp
Gesendet: Sonntag, 7. September 2014 04:21
An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] OCXO Voltage Input? (Bob Camp)
Hi
Simple answer = crystals are never perfect.
Longer winded, but very incomplete answer =
A spurious response in a crystal normal
Hi
Simple answer = crystals are never perfect.
Longer winded, but very incomplete answer =
A spurious response in a crystal normally refers to a mode that is not one of
the “identified” modes of the crystal. An AT has a set of identified modes, an
SC has a more complex set of modes. In the cas
On Sat, Sep 6, 2014 at 9:13 PM, Hal Murray wrote:
> What's the mechanism for making spurs with a crystal?
>
Get the corners nice and pointy and strap it to a boot.
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kb...@n1k.org said:
> The biggest problem comes from crystal spurs rather than crystal Q.
What's the mechanism for making spurs with a crystal?
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These are my opinions. I hate spam.
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Bob,
Agreed. I'm just saying that it goes static if you have PWM or something
similar.
As you see, there are many little details out there.
Cheers,
Magnus
On 09/06/2014 08:30 PM, Bob Camp wrote:
Hi
If you are counting on your loop noise to spread your tones out - indeed not a
good idea. T
Hi
If you are counting on your loop noise to spread your tones out - indeed not a
good idea. There are several ways you can “go quiet” in your loop….
Bob
On Sep 6, 2014, at 2:10 PM, Magnus Danielson wrote:
> Hi Bob,
>
> Indeed. The way to keep the MCU PWM doing reasonable stuff is to use a h
Hi Bob,
Indeed. The way to keep the MCU PWM doing reasonable stuff is to use a
higher rate, and then update the PWM value in sync with the wrap-around,
and then alter the value (dither or whatever) so that the average has
higher precision. First degree sigma-delta is actually not a bad
strate
ence for.
>
> The low frequency limit is in the 5-10 Hz range. The AFC of a good tuner will
> eliminate most everything below that frequency.
>
> More details here
> http://www.diyaudio.com/forums/blogs/1audio/983-fm-tuner-jitter-analysis.html
>
>> Subject: Re: [tim
o/983-fm-tuner-jitter-analysis.html
>Subject: Re: [time-nuts] OCXO Voltage Input? (Bob Camp)
>Message-ID:
>Content-Type: text/plain; charset=windows-1252
>Hi
>Yes indeed, as you go below 1 Hz (or 1 radian/sec) all the things that “help”
>you roll off wise now hurt you. I
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