But I got my question answered anyway. :)
On Sat, 29 Oct 2016 05:29:26 +, you wrote:
>Yep, should have gone to volt-nuts. Recent changes Microsoft has been doing
>to Outlook, etc have been causing all sorts of fun gltches. One being not
>actually taking copy-pastes of addresses and/or su
nsa...@kfu.com said:
> That single-chip version is going to have a *LOT* less (and less variable)
> latency than an SDR.
Latency isn't an issue as long as it is known so that you can correct for it.
Has anybody measured the jitter through SDR and/or tried to reduce it? I'd
expect that even if
That single-chip version is going to have a *LOT* less (and less variable)
latency than an SDR.
> On Oct 27, 2016, at 12:20 AM, Poul-Henning Kamp wrote:
>
>
> In message <5a002554-8d90-4c75-95da-21db45d61...@kfu.com>, Nick Sayer via
> time-
> nuts writes:
>
>> If you’re in North Amer
Yep, should have gone to volt-nuts. Recent changes Microsoft has been doing
to Outlook, etc have been causing all sorts of fun gltches. One being not
actually taking copy-pastes of addresses and/or subject lines. Another being
sorting emails into dark and crusty corners of ancient folders...
Ah, you might not have meant that for this list. You are a man of many
talents.
Dimethyl mercury has given elemental mercury a bad name it doesn't
deserve. As a youth, I used it to turn pennies into silvery dimes.
Father said he'd ingested a teaspoon to see how fast it would go through
him. In his
I don't know if it the proper way but I used a very nice fume hood. Measured
the metals (high purity), melted them in a quartz crucible, stirred with a
quartz rod, and cast it in a ceramic block with a spiral pattern machined into
it with a ball mill. You don't want to contaminate the mixtu
Hi,
On a related note, I remember when Pendulum was testing a rubidium and
it had more jitter than motivated by the integrated phase-noise slopes,
so they where curious about it. As I had just brought in my SIA3000 for
them to have fun with, I hooked it up and already in the oscilloscope
view
HI
Probably what is going on is that the OCXO’s have a parasitic oscillaton in the
UHF
region. It has injection locked to the 10 MHz. You get a signal that is much
higher
level than any harmonic relation would predict.
I’d try fiddling the bypassing and load ….
Bob
> On Oct 28, 2016, at 8:4
This really is Time Nuts related. Keep reading.
I recently bought some surplus Motorola UHF mobiles. They came with
the previous frequencies blanked and only channel one programmed with
460.000 MHz.
I put all of them on the bench to do a quick test to see if they
transmitted and received. Upon po
Oh never mind.
MAJOR BF!!!
How I 'morphed' S30 into S05 I can't explain.
I suspect it is a 74S30 but I can't prove it.
Sorry.
Joe
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham
Sent: Friday, October 28, 2016 5:57 PM
To: 'Discussion o
Not S05 but S30. A 74S30 is an 8 input NAND and the foot pint on the
board, looking
at the inputs and outputs, seems to confirm it.
There is no 5 volt regulator. The power pin is connected directly to
the power
pin of a 74S30.
Pete.
On 10/28/2016 6:50 PM, J. L. Trantham wrote:
I have em
Sorry.
74S05D.
Joe
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham
Sent: Friday, October 28, 2016 5:50 PM
To: 'Tom Miller'; 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Opening an Isotemp OCXO
I have e
I have emailed Peter separately earlier today.
The top side marking of the chip appears to indicate it is a TI 74LS05D.
The datasheet is here:
http://www.ti.com/lit/ds/symlink/sn74ls05.pdf
If it is indeed a 'HEX Inverter', perhaps another 'channel' can be wired in
place to see if it would work
Can you see the voltage on the yellow dipped tantalum under the board? I
think that is what it is.
- Original Message -
From: "Peter Reilley"
To: "Discussion of precise time and frequency measurement"
Sent: Friday, October 28, 2016 3:28 PM
Subject: Re: [time-nuts] Opening an Isotem
On 10/28/16 1:09 PM, Bob Stewart wrote:
Hi Bob,
Can't the OCXOs be characterized pretty closely by someone with the right tools
and staff? I don't have a big sample to speak from, but the Trimbles I use
only have a couple of ceramic coated pieces, and those can be exposed down to
the die by h
Hi
Well, the first issue would be the one that started this thread…. what’s the
supply and pinout.
Yes, you can tear a couple open and work that out. Next step would be to verify
that the other
couple hundred in the batch all are the same pinout and supply.
Assuming that you have all the same p
I do not think the designer was considering noise at all because tying
the inputs together would not do anything useful. Emitter resistance
is inversely proportional to emitter current (26/mA) but putting them
in parallel lowers the current through each emitter so the total
emitter resistance stay
>From experience, I can tell you that you can't always depend on the seller
>when it comes to how to feed your new OCXO. For instance, the seller of the
>Trimble 65256 insisted that it took 12V. So, that's what I used, and all the
>magic smoke came tumbling out.
Bob
From: Peter Reille
It looks like that is the only device that could be damaged by 12 volts. Can
you find a replacement and try running at 5 volts?
- Original Message -
From: "Peter Reilley"
To: "Discussion of precise time and frequency measurement"
Sent: Friday, October 28, 2016 3:10 PM
Subject: Re:
Hi Bob,
Can't the OCXOs be characterized pretty closely by someone with the right tools
and staff? I don't have a big sample to speak from, but the Trimbles I use
only have a couple of ceramic coated pieces, and those can be exposed down to
the die by hand and then characterized, can't they? G
Man O man I am loosing track here.
The s30 makes it a ttl part. So 12 V would have smoked it.
Seems like an easy fix for that piece at least.
Regards
Paul
WB8TSL
On Fri, Oct 28, 2016 at 3:28 PM, Peter Reilley
wrote:
> That seems the most reasonable thing to do.
>
> Pete
>
>
> On 10/28/2016 3:20
Hi
Roughly 99.9% of all OCXO’s made go to large OEM customers. The percentage may
actually be a bit higher than that. There are relatively few markets that
“catalog” OCXO’s
sell into.
Inevitably the first thing that an OEM wants is some form of customization. A
specific
supply voltage, a cert
That seems the most reasonable thing to do.
Pete
On 10/28/2016 3:20 PM, Tom Miller wrote:
It looks like that is the only device that could be damaged by 12
volts. Can you find a replacement and try running at 5 volts?
- Original Message - From: "Peter Reilley"
To: "Discussion of p
The data sheet for the device only mentions 12V. Other data sheets (eg the
131) mention 5V and 12V, but don't indicate how to specify one or the
other.
Gerry Sweeny's article at
http://gerrysweeney.com/diy-hpagilent-53131a-010-high-stability-timebase-option/
mentions a part number suffix that dist
I don't know, I looked for a name and could not find one.
Sometimes there is no substitute for a big block of copper when soldering.
I pick them up at flea markets, no one wants them. I have a few.
Pete.
On 10/28/2016 12:27 PM, Adrian Godwin wrote:
That's one sweet soldering iron. Is it an Am
The reason that there was 12 volts on the unit was because I put it
there. I should
have tried 5 volts first but the only datasheet that I could find said
12 volts.
All the eBay units that look the same say 12 volts.
Pete.
On 10/28/2016 12:53 PM, paul swed wrote:
I confirmed the pin out mat
There is no regulator in the unit. The power pin is connected directly
to the S30 chip.
Pete.
On 10/28/2016 1:31 PM, J. L. Trantham wrote:
Have you measured the voltage on the 'power' pin for the chip with 12 V applied
to the OCXO (or 5 V applied)?
Is there a 5 V regulator on the board?
There is no regulator chip in the unit. I am thinking that this must
be a 5 volt unit.
Pete.
On 10/28/2016 12:42 PM, Dan Rae wrote:
On 10/28/2016 9:09 AM, Peter Reilley wrote:
The only document that I could find said 12 volt.
Pete.
The 82 series came in a lot of flavors. I have one 82-49 w
When I have an unknown OCXO, I put a scope on the output and connect a bench
power supply to the DC inputs. I bring up the voltage until the RF out hits
a stable level. That is where the internal regulator starts regulating. Then
set it to the nearest normal power supply voltage, +5, +12, +15, +
I wounder if originally the designer was hoping to use all 8 wire or'd
inputs to lower the input referred noise during midscale transition. Then
backed out later for some reason.
On Fri, Oct 28, 2016 at 1:03 PM, Scott Stobbe
wrote:
> Could also be a quirk about the 74S30 that gives it better pha
The 1k resistor doesn't seem to feed the 'S30'. It looks as though pin 14
(Vcc) goes via that thick track to the +12 input.
On Fri, Oct 28, 2016 at 5:46 PM, jimlux wrote:
> On 10/28/16 8:31 AM, Peter Reilley wrote:
>
> Looking around with my scope it seems that the output driver chip is bad
>> a
Could also be a quirk about the 74S30 that gives it better phase noise over
a basic buffer.
On Friday, 28 October 2016, jimlux wrote:
> On 10/28/16 9:13 AM, Scott Stobbe wrote:
>
>> The OCXO82-59 datasheet lists 12V supply, 5V clock out, could also be a
>> blown regulator in your ocxo, if it is
On 10/28/16 8:31 AM, Peter Reilley wrote:
Looking around with my scope it seems that the output driver chip is bad
as I expected. It is a TI 14 pin surface mount DIP. It says S30 on it
which if it is a 74S30 it is an 8 input positive NAND gate. The board
layout confirms this as the 10 MHz
I confirmed the pin out matches a 74s30 also. An S30 is TTL. Great pix to
look at.
So 12 V on a 5 V chip is indeed a smoker. Find out why there was 12 V.
OK crazy talk I see a 1K resistor next to the VCC chip. Would anyone be
crazy enough to use a dropping resistor from 12 V to get 5?? Really bad
e
On 10/28/16 9:13 AM, Scott Stobbe wrote:
The OCXO82-59 datasheet lists 12V supply, 5V clock out, could also be a
blown regulator in your ocxo, if it is indeed a 12v model.
There you go..the design could use a 74S30 as a driver - it's fast,
fairly good drive, but runs off 5V. If the regulator i
On 10/28/2016 9:09 AM, Peter Reilley wrote:
The only document that I could find said 12 volt.
Pete.
The 82 series came in a lot of flavors. I have one 82-49 which is
definitely 12V ( draws 0.12A when warm and maybe 0.3 when cold) and has
a 5V pp square wave output at 10 MHz. It also has a Vr
Here is the TI document on "Case Marking." It may not be a 74S30.
http://www.ti.com/lit/an/snoa039c/snoa039c.pdf
--- Graham
==
On Fri, Oct 28, 2016 at 11:27 AM, Adrian Godwin wrote:
> That's one sweet soldering iron. Is it an American Beauty ?
>
>
> On Fri, Oct 28, 2016 at 4:31 PM, Peter Rei
That's one sweet soldering iron. Is it an American Beauty ?
On Fri, Oct 28, 2016 at 4:31 PM, Peter Reilley
wrote:
> I did finally get it open. I used a very large old style soldering
> iron and .003 inch steel shim stock. I would melt the solder on the
> straight seams and insert small piec
The OCXO82-59 datasheet lists 12V supply, 5V clock out, could also be a
blown regulator in your ocxo, if it is indeed a 12v model.
On Friday, 28 October 2016, Poul-Henning Kamp wrote:
>
> In message <10a3ea7d-37f0-51bc-2470-35645d767...@comcast.net
> >, Peter Reilley writes:
>
> >The ch
The only document that I could find said 12 volt.
Pete.
On 10/28/2016 11:49 AM, Poul-Henning Kamp wrote:
In message <10a3ea7d-37f0-51bc-2470-35645d767...@comcast.net>, Peter Reilley
writes:
The chip is run off 12 volts so it must be CMOS.
Or the OCXO is not a 12V model ?
_
In message <10a3ea7d-37f0-51bc-2470-35645d767...@comcast.net>, Peter Reilley
writes:
>The chip is run off 12 volts so it must be CMOS.
Or the OCXO is not a 12V model ?
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD comm
I did finally get it open. I used a very large old style soldering
iron and .003 inch steel shim stock. I would melt the solder on the
straight seams and insert small pieces of the shim. Solder does not
stick well to steel so the shim kept the soldered seam open.
I used a soldering iron rath
Stewart,
Thank you for sharing this information. I had heard of the testing but
little detail and like all time-nuts curious.
I have the same question as Hal, whats available. I am spoiled by some of
the amazing freeware today that allows a time-nut to obtain some great
technology at a reasonable p
On 10/28/16 5:03 AM, Bob Camp wrote:
Hi
If you look at the mode shapes for the various overtones, their energy
maxima are at different locations on the blank. If you put an electrode on
top of the 3rd overtone energy pattern (and avoid the fundamental pattern)
you will boost the 3rd and reduce t
HI
Roughly 99% of it is buried away in the heads of a few dozen people around
the world.
Bob
> On Oct 28, 2016, at 4:24 AM, Attila Kinali wrote:
>
> Hoi Bob,
>
> On Thu, 27 Oct 2016 19:50:46 -0400
> Bob Camp wrote:
>
>> Crystals are highly optimized for the specific overtone they are
>> i
Hi
If you look at the mode shapes for the various overtones, their energy
maxima are at different locations on the blank. If you put an electrode on
top of the 3rd overtone energy pattern (and avoid the fundamental pattern)
you will boost the 3rd and reduce the fundamental. You can actually find
e
Hoi Bob,
On Thu, 27 Oct 2016 19:50:46 -0400
Bob Camp wrote:
> Crystals are highly optimized for the specific overtone they are
> intended to operate on. In fact, you can fiddle them to the point
> that they no longer have a “fundamental” response.
Interesting, thanks!
Do you have any reference
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