Re: [time-nuts] a newbie question: where can I purchase 794.7nm VCSEL for building CPT rubidium clock?

[Hal Murray]

k8yumdoo...@gmail.com said:
> I've been told that CD player type diodes can be successfully modulated up to
> about 600 MHz, but that going much further is either difficult or perhaps
> impossible.

Are DVD lasers faster?


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Re: [time-nuts] Affordable PoE 6-digit time displays?

[Hal Murray]

bow...@gmail.com said:
> I’m still hunting for something that will take NTP in and put IRIG out. 
> There
> is probably someone doing it with a Pi or an Arduino.  

There is a module in the ntp package/collection that puts out IRIG from the 
system clock.  You can use NTP if you want to keep your clock sane.  I forget 
the name.  I'll fish it out if you can't find it.


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Re: [time-nuts] Affordable PoE 6-digit time displays?

[Bob Bownes]

If you can snag something that will put out IRIG-B, there are lots of choices. 

I’m still hunting for something that will take NTP in and put IRIG out. There 
is probably someone doing it with a Pi or an Arduino. 

Bob



> On Jun 14, 2018, at 21:38, Chris Howard  wrote:
> 
> Maybe not exactly, but I use an app on an old Android cell phone as my UTC 
> wall clock. Large characters in horizontal mode; NTP via WiFi.
> 
> 
> 
> 
> ⁣Sent from BlueMail ​
> 
>> On Jun 14, 2018, 20:15, at 20:15, David Andersen  
>> wrote:
>> I'd hoped that ebay or aliexpress would yield a bounty given how
>> seemingly
>> simple these are, but I'm drawing a blank (and finding a lot of $300+
>> new
>> options).  Anyone have a favorite source for either flat wall-mount or
>> rackmount displays that will pull from an NTP/SNTP/whatever server?
>> 
>> (if wall-mount, PoE is optimal).  Used good.  Cheap good.  Looks good
>> next
>> to my random collection of antiquated time measurement gear provides
>> amusement value but isn't really critical. :-)
>> 
>> Thanks!
>> 
>> -Dave
>> ___
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Re: [time-nuts] a newbie question: where can I purchase 794.7nm VCSEL for building CPT rubidium clock?

[Dana Whitlow]

I've been told that CD player type diodes can be successfully modulated
up to about 600 MHz, but that going much further is either difficult or
perhaps impossible.  This came from a guy (at Tektronix) who worked with
various types
of diode lasers a lot, back in the 1980's.  But at least they are cheap.  I
suspect that the leaded
package is a significant part of the issue; this ought to be somewhat
mitigated
by a suitable RF matching network.

Dana


On Thu, Jun 14, 2018 at 10:51 AM, Attila Kinali  wrote:

> On Mon, 11 Jun 2018 22:29:42 +0800
> mimitech mimitech  wrote:
>
> > I think your information is very interesting. I didn't realize which type
> > of common LDs can do GHz level modulation (anyway I didn’t have much
> > knowledge on laser diode before).
>
> Hehe. Same here. When I looked into CPT I thought that one needs
> a fast laser diode as well. Then, a few years ago, I had the chance
> to talk to John Kitching who corrected a few of my assumptions.
>
> > It would be great If you could recommend
> > several good Laser diodes (which vendor/part number) with possible 1-2GHz
> > modulation bandwidth. Thanks!
>
> Sorry, unfortunately I do not have any reliable data on the bandwidth
> of standard laser diodes. The easiest would be probably if you select
> some diodes that you can easily acquire, then contact the manufacturer.
> Manufacturers almost always have more data on their devices than they
> put into the datasheet. They do not include it because they can either
> not sufficiently control those parameters during production, cannot
> test for it or testing would be too expensive.
>
> Attila Kinali
>
> --
> It is upon moral qualities that a society is ultimately founded. All
> the prosperity and technological sophistication in the world is of no
> use without that foundation.
>  -- Miss Matheson, The Diamond Age, Neil Stephenson
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/
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Re: [time-nuts] Spectracom 8140T Line Tap Schematic

[Charles Steinmetz]

Julien wrote:


I'm somewhat tempted to take the schematic and see if I can fit it in
the comparatively tiny Pomona boxes


Before getting too excited about the various 8140 module designs, it may 
be worth reflecting that the performance of the 8140 system is mediocre 
at best from a time-nuts perspective.  There are lots and lots of much 
better designs if you're building your own.  Even something as simple as 
a modified video distribution amplifier can be orders of magnitude 
better (see, e.g., 
).


The point of the 8140 system is that it is a moderate performance, "do 
everything" solution for large installations (hundreds of potentially 
multifrequency taps spaced around acres of facility), not a 
time-nuts-quality distribution system for a facility the size of a 
residential home.


Best regards,

Charles


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Re: [time-nuts] Affordable PoE 6-digit time displays?

[Chris Howard]

Maybe not exactly, but I use an app on an old Android cell phone as my UTC wall 
clock. Large characters in horizontal mode; NTP via WiFi.




⁣Sent from BlueMail ​

On Jun 14, 2018, 20:15, at 20:15, David Andersen  
wrote:
>I'd hoped that ebay or aliexpress would yield a bounty given how
>seemingly
>simple these are, but I'm drawing a blank (and finding a lot of $300+
>new
>options).  Anyone have a favorite source for either flat wall-mount or
>rackmount displays that will pull from an NTP/SNTP/whatever server?
>
>(if wall-mount, PoE is optimal).  Used good.  Cheap good.  Looks good
>next
>to my random collection of antiquated time measurement gear provides
>amusement value but isn't really critical. :-)
>
>Thanks!
>
>  -Dave
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Re: [time-nuts] Affordable PoE 6-digit time displays?

[Bob kb8tq]

Hi

I think this is one of those really small market items. You can probably cobble 
one
together from bits and pieces for less than you can buy a good one.

Bob

> On Jun 14, 2018, at 9:15 PM, David Andersen  wrote:
> 
> I'd hoped that ebay or aliexpress would yield a bounty given how seemingly
> simple these are, but I'm drawing a blank (and finding a lot of $300+ new
> options).  Anyone have a favorite source for either flat wall-mount or
> rackmount displays that will pull from an NTP/SNTP/whatever server?
> 
> (if wall-mount, PoE is optimal).  Used good.  Cheap good.  Looks good next
> to my random collection of antiquated time measurement gear provides
> amusement value but isn't really critical. :-)
> 
> Thanks!
> 
>  -Dave
> ___
> time-nuts mailing list -- time-nuts@febo.com
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[time-nuts] Affordable PoE 6-digit time displays?

[David Andersen]

I'd hoped that ebay or aliexpress would yield a bounty given how seemingly
simple these are, but I'm drawing a blank (and finding a lot of $300+ new
options).  Anyone have a favorite source for either flat wall-mount or
rackmount displays that will pull from an NTP/SNTP/whatever server?

(if wall-mount, PoE is optimal).  Used good.  Cheap good.  Looks good next
to my random collection of antiquated time measurement gear provides
amusement value but isn't really critical. :-)

Thanks!

  -Dave
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Re: [time-nuts] Raw phase data of super-5065

[Attila Kinali]

On Thu, 14 Jun 2018 15:14:55 +0200
Magnus Danielson  wrote:

> Do we have the raw measurements in a readable format?

Yes, you can find them at
http://time.kinali.ch/phase_data/luciano/

Attila Kinali
-- 
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the prosperity and technological sophistication in the world is of no 
use without that foundation.
 -- Miss Matheson, The Diamond Age, Neil Stephenson
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Re: [time-nuts] a newbie question: where can I purchase 794.7nm VCSEL for building CPT rubidium clock?

[Attila Kinali]

On Mon, 11 Jun 2018 22:29:42 +0800
mimitech mimitech  wrote:

> I think your information is very interesting. I didn't realize which type
> of common LDs can do GHz level modulation (anyway I didn’t have much
> knowledge on laser diode before). 

Hehe. Same here. When I looked into CPT I thought that one needs
a fast laser diode as well. Then, a few years ago, I had the chance
to talk to John Kitching who corrected a few of my assumptions.

> It would be great If you could recommend
> several good Laser diodes (which vendor/part number) with possible 1-2GHz
> modulation bandwidth. Thanks!

Sorry, unfortunately I do not have any reliable data on the bandwidth
of standard laser diodes. The easiest would be probably if you select
some diodes that you can easily acquire, then contact the manufacturer.
Manufacturers almost always have more data on their devices than they
put into the datasheet. They do not include it because they can either
not sufficiently control those parameters during production, cannot 
test for it or testing would be too expensive.

Attila Kinali

-- 
It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
 -- Miss Matheson, The Diamond Age, Neil Stephenson
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Re: [time-nuts] Spectracom 8140T Line Tap Schematic

[Dana Whitlow]

Hi Bob & Julien,

Why bother with the short on the downstream end of that DC-blocking
attenuator?  At 10 MHz I'd expect
leakage radiation to be negligible.

Dana

On Thu, Jun 14, 2018 at 10:43 AM, Bob kb8tq  wrote:

> Hi
>
> > On Jun 14, 2018, at 9:31 AM, gandalfg8--- via time-nuts <
> time-nuts@febo.com> wrote:
> >
> >
> > Hi Julien,
> >
> >
> >
> > Earlier replies that discussed removing the DC supply from the 8140
> outputs gave me the impression your requirement was to connect directly the
> outputs of the 8140 without line tap modules, which is what I was
> addressing with my recent suggestion of a series capacitor, but can see now
> that's not the case.
> >
> >
> >
> > If you were to build your own termination the same principle would still
> apply of course but perhaps another option for a reasonably compact
> solution, aside from a coaxial DC block followed by a 50 ohm termination,
> might be a DC blocking attenuator followed by a BNC shorting dust cap, as
> the latter are generally quite small.
> >
> >
> > For example, current Ebay item 332461304064 is a DC blocked 20dB
> attenuator, they are also available in pairs at a slight discount, and that
> fitted with a shorting cap would give you a return loss of 40dB, which is
> probably as good as you'd get from most 50 ohm terminations anyway and
> would save having to build your own.
>
>
> I would be very surprised if the original terminations did any better than
> 20 to 30 db return loss. They are not fancy devices.
> I’ve also seen a lot of attenuators that only make it to about 20 db of
> return loss …..
>
> Bob
>
>
> >
> >
> > The VersaTaps phase lock an internal crystal, any frequency between 4
> and 20MHz, to the 10MHz input and then provide an output at the crystal
> frequency or the crystal frequency divided by a fixed integer between 1 and
> 8,192, so in that sense yes they're a synthesiser but the few I've seen
> were still supplied preset for a specific frequency.
> >
> >
> > However, "versatile" does not necessarilly mean quick or convenient to
> reprogram.
> > Aside from perhaps needing  to change the crystal the division ratio
> needs to be set by adding or removing links across pairs of holes in the
> circuit board. Those holes are on a standard 0.1inch pitch so fitting
> headers that would take shorting links should be straightfoward enough, and
> I suspect what was originally intended, but the units I have were supplied
> preprogrammed using resistor style wire ended zero ohm links mounted above
> the circuit board and soldered from below. Reprogramming one of these would
> involve unsoldering and perhaps removing all the connectors etc in order to
> remove the circuit board, so I'd certainly make darn sure they had headers
> fitted before being returned to the box!
> >
> >
> >
> > Nigel, GM8PZR
> >
> >
> >
> >
> >
> >
> > -Original Message-
> > From: Julien Goodwin 
> > To: gandalfg8 ; Discussion of precise time and
> frequency measurement 
> > Sent: Thu, 14 Jun 2018 11:36
> > Subject: Re: [time-nuts] Spectracom 8140T Line Tap Schematic
> >
> > I'm somewhat tempted to take the schematic and see if I can fit it in
> > the comparatively tiny Pomona boxes, although I have far too many side
> > projects already, enough 10MHz taps, and I still need to do the
> terminators.
> >
> > The VersaTaps are supposed to be an actual synthesizer IIRC.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > ___
> > time-nuts mailing list -- time-nuts@febo.com
> > To unsubscribe, go to https://www.febo.com/cgi-bin/
> mailman/listinfo/time-nuts
> > and follow the instructions there.
>
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Re: [time-nuts] Spectracom 8140T Line Tap Schematic

[Bob kb8tq]

Hi

> On Jun 14, 2018, at 9:31 AM, gandalfg8--- via time-nuts  
> wrote:
> 
> 
> Hi Julien, 
> 
> 
> 
> Earlier replies that discussed removing the DC supply from the 8140 outputs 
> gave me the impression your requirement was to connect directly the outputs 
> of the 8140 without line tap modules, which is what I was addressing with my 
> recent suggestion of a series capacitor, but can see now that's not the case.
> 
> 
> 
> If you were to build your own termination the same principle would still 
> apply of course but perhaps another option for a reasonably compact solution, 
> aside from a coaxial DC block followed by a 50 ohm termination, might be a DC 
> blocking attenuator followed by a BNC shorting dust cap, as the latter are 
> generally quite small.
> 
> 
> For example, current Ebay item 332461304064 is a DC blocked 20dB attenuator, 
> they are also available in pairs at a slight discount, and that fitted with a 
> shorting cap would give you a return loss of 40dB, which is probably as good 
> as you'd get from most 50 ohm terminations anyway and would save having to 
> build your own.


I would be very surprised if the original terminations did any better than 20 
to 30 db return loss. They are not fancy devices.
I’ve also seen a lot of attenuators that only make it to about 20 db of return 
loss …..

Bob


> 
> 
> The VersaTaps phase lock an internal crystal, any frequency between 4 and 
> 20MHz, to the 10MHz input and then provide an output at the crystal frequency 
> or the crystal frequency divided by a fixed integer between 1 and 8,192, so 
> in that sense yes they're a synthesiser but the few I've seen were still 
> supplied preset for a specific frequency.
> 
> 
> However, "versatile" does not necessarilly mean quick or convenient to 
> reprogram.
> Aside from perhaps needing  to change the crystal the division ratio needs to 
> be set by adding or removing links across pairs of holes in the circuit 
> board. Those holes are on a standard 0.1inch pitch so fitting headers that 
> would take shorting links should be straightfoward enough, and I suspect what 
> was originally intended, but the units I have were supplied preprogrammed 
> using resistor style wire ended zero ohm links mounted above the circuit 
> board and soldered from below. Reprogramming one of these would involve 
> unsoldering and perhaps removing all the connectors etc in order to remove 
> the circuit board, so I'd certainly make darn sure they had headers fitted 
> before being returned to the box!
> 
> 
> 
> Nigel, GM8PZR
> 
> 
> 
> 
> 
> 
> -Original Message-
> From: Julien Goodwin 
> To: gandalfg8 ; Discussion of precise time and frequency 
> measurement 
> Sent: Thu, 14 Jun 2018 11:36
> Subject: Re: [time-nuts] Spectracom 8140T Line Tap Schematic
> 
> I'm somewhat tempted to take the schematic and see if I can fit it in
> the comparatively tiny Pomona boxes, although I have far too many side
> projects already, enough 10MHz taps, and I still need to do the terminators.
> 
> The VersaTaps are supposed to be an actual synthesizer IIRC.
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
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Re: [time-nuts] Spectracom 8140T Line Tap Schematic

[Julien Goodwin]

On 14/06/18 23:31, gandalfg8--- via time-nuts wrote:
> Earlier replies that discussed removing the DC supply from the 8140 outputs 
> gave me the impression your requirement was to connect directly the outputs 
> of the 8140 without line tap modules, which is what I was addressing with my 
> recent suggestion of a series capacitor, but can see now that's not the case.

I think that was a digression from my post, I'm planning to use the 8140
as-expected by Spectracom.

> The VersaTaps phase lock an internal crystal, any frequency between 4 and 
> 20MHz, to the 10MHz input and then provide an output at the crystal frequency 
> or the crystal frequency divided by a fixed integer between 1 and 8,192, so 
> in that sense yes they're a synthesiser but the few I've seen were still 
> supplied preset for a specific frequency.

Ah, yes, that design would make a lot of sense. I was imagining a more
modern design you might do these days.

> However, "versatile" does not necessarilly mean quick or convenient to 
> reprogram.
> Aside from perhaps needing  to change the crystal the division ratio needs to 
> be set by adding or removing links across pairs of holes in the circuit 
> board. Those holes are on a standard 0.1inch pitch so fitting headers that 
> would take shorting links should be straightfoward enough, and I suspect what 
> was originally intended, but the units I have were supplied preprogrammed 
> using resistor style wire ended zero ohm links mounted above the circuit 
> board and soldered from below. Reprogramming one of these would involve 
> unsoldering and perhaps removing all the connectors etc in order to remove 
> the circuit board, so I'd certainly make darn sure they had headers fitted 
> before being returned to the box!

I'm going to have to do something very similar to the 8140 when it
arrives, as I bought one set for 1MHz input, and I'm going to
(initially) be feeding it 5MHz from an FRK.
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[time-nuts] PRS10 lamp voltage

[Jean-Paul Sabatier]

Hello,

I am a new subscriber to the list ! I am located in France and I play with
time and frequency instruments on my free time.

Recently I've bought an used FS725 unit with a PRS10 oscillator in it. I
was wondering how can I estimated the age of the Rubidium oscillator. I
think the age is related to the lamp voltage but which voltage should I
read ? In the documentation, there are a lot of parameters, for example
AD3 : Drain voltage to lamp FET / 10
AD4 : Gate voltage to lamp FET / 10
Which one is related to the lamp aging and what are the standard values for
a new oscillator ?

I have an LPRO oscillator and with it I can measure easily the voltage
directly. A new unit is at about 15V and it decrease slowly (about 20
mV/month).

Thanks!

jps
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Re: [time-nuts] Spectracom 8140T Line Tap Schematic

[gandalfg8--- via time-nuts]

Hi Julien, 



Earlier replies that discussed removing the DC supply from the 8140 outputs 
gave me the impression your requirement was to connect directly the outputs of 
the 8140 without line tap modules, which is what I was addressing with my 
recent suggestion of a series capacitor, but can see now that's not the case.



If you were to build your own termination the same principle would still apply 
of course but perhaps another option for a reasonably compact solution, aside 
from a coaxial DC block followed by a 50 ohm termination, might be a DC 
blocking attenuator followed by a BNC shorting dust cap, as the latter are 
generally quite small.


For example, current Ebay item 332461304064 is a DC blocked 20dB attenuator, 
they are also available in pairs at a slight discount, and that fitted with a 
shorting cap would give you a return loss of 40dB, which is probably as good as 
you'd get from most 50 ohm terminations anyway and would save having to build 
your own.


The VersaTaps phase lock an internal crystal, any frequency between 4 and 
20MHz, to the 10MHz input and then provide an output at the crystal frequency 
or the crystal frequency divided by a fixed integer between 1 and 8,192, so in 
that sense yes they're a synthesiser but the few I've seen were still supplied 
preset for a specific frequency.


However, "versatile" does not necessarilly mean quick or convenient to 
reprogram.
Aside from perhaps needing  to change the crystal the division ratio needs to 
be set by adding or removing links across pairs of holes in the circuit board. 
Those holes are on a standard 0.1inch pitch so fitting headers that would take 
shorting links should be straightfoward enough, and I suspect what was 
originally intended, but the units I have were supplied preprogrammed using 
resistor style wire ended zero ohm links mounted above the circuit board and 
soldered from below. Reprogramming one of these would involve unsoldering and 
perhaps removing all the connectors etc in order to remove the circuit board, 
so I'd certainly make darn sure they had headers fitted before being returned 
to the box!



Nigel, GM8PZR
 





-Original Message-
From: Julien Goodwin 
To: gandalfg8 ; Discussion of precise time and frequency 
measurement 
Sent: Thu, 14 Jun 2018 11:36
Subject: Re: [time-nuts] Spectracom 8140T Line Tap Schematic

I'm somewhat tempted to take the schematic and see if I can fit it in
the comparatively tiny Pomona boxes, although I have far too many side
projects already, enough 10MHz taps, and I still need to do the terminators.

The VersaTaps are supposed to be an actual synthesizer IIRC.














 

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Re: [time-nuts] Raw phase data of super-5065

[Magnus Danielson]

Hi,

All I have seen so far is an ADEV plot, and that is not a good tool to
estimate such systematics in. I would like to see the phase & frequency
data, it would probably be better for this type of diagnostics.

Do we have the raw measurements in a readable format?

Cheers,
Magnus

On 06/14/2018 03:06 PM, Bob kb8tq wrote:
> Hi
> 
> I’d say both have a “something” with a period of roughly 18 to 20 hours in 
> their
> data runs. 
> 
> Bob
> 
>> On Jun 14, 2018, at 4:54 AM, Attila Kinali  wrote:
>>
>> On Wed, 13 Jun 2018 08:19:58 -0700
>>  wrote:
>>
>>> Would be interesting to see a long plot of the two 5065 against each
>>> other!
>>
>> I had a look at Luciano's data and it's probably safe to say, that
>> the instability of the super-5065 would be the limit. The unmodified
>> 5065 is incredibly stable (once you remove drift).
>>
>> Attached are the two phase plots, both with quadratic drift removed.
>> The unmodified 5065A has a kind of weird ~18day undulation. I would
>> say it's an environmental effect, but the two cycles are too similar,
>> so I do not know what to think of it.
>>
>> The super-5065 (5065B) has quite a few bigger frequency jumps, with
>> pretty stable phases in-between. My guess here would be that there
>> are no environmental effects and it is limited by instabilities in
>> the frequency discriminator electronics, ie offsets that show (close to)
>> discrete jumps. or that the lamp brightness changes.
>>
>>  Attila Kinali
>>
>> -- 
>> It is upon moral qualities that a society is ultimately founded. All 
>> the prosperity and technological sophistication in the world is of no 
>> use without that foundation.
>> -- Miss Matheson, The Diamond Age, Neil Stephenson
>> > 30days.png>___
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>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
> 
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> 
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Re: [time-nuts] Raw phase data of super-5065

[Bob kb8tq]

Hi

I’d say both have a “something” with a period of roughly 18 to 20 hours in their
data runs. 

Bob

> On Jun 14, 2018, at 4:54 AM, Attila Kinali  wrote:
> 
> On Wed, 13 Jun 2018 08:19:58 -0700
>  wrote:
> 
>> Would be interesting to see a long plot of the two 5065 against each
>> other!
> 
> I had a look at Luciano's data and it's probably safe to say, that
> the instability of the super-5065 would be the limit. The unmodified
> 5065 is incredibly stable (once you remove drift).
> 
> Attached are the two phase plots, both with quadratic drift removed.
> The unmodified 5065A has a kind of weird ~18day undulation. I would
> say it's an environmental effect, but the two cycles are too similar,
> so I do not know what to think of it.
> 
> The super-5065 (5065B) has quite a few bigger frequency jumps, with
> pretty stable phases in-between. My guess here would be that there
> are no environmental effects and it is limited by instabilities in
> the frequency discriminator electronics, ie offsets that show (close to)
> discrete jumps. or that the lamp brightness changes.
> 
>   Attila Kinali
> 
> -- 
> It is upon moral qualities that a society is ultimately founded. All 
> the prosperity and technological sophistication in the world is of no 
> use without that foundation.
> -- Miss Matheson, The Diamond Age, Neil Stephenson
>  30days.png>___
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Re: [time-nuts] Spectracom 8140T Line Tap Schematic

[Bob kb8tq]

Hi

I think you would find a *lot* of smaller outfits “back in the day” running 
hand soldering lines. Small scale wave solder for through hole did not 
catch on the way reflow has for SMT. Dip solder was a rare item ….

Bob

> On Jun 13, 2018, at 11:28 PM, Charles Steinmetz  wrote:
> 
> Nigel wrote:
> 
>> with far too many assorted internal photos plus details of said interesting 
>> discovery, with extra brownie points to anyone who might already be thinking 
>> foam and cardboard sandwiches:-)
> 
> Oh, my, that brings back memories!  That method of "encapsulation" was used 
> by a number of Rochester electronics firms of the era.  It was developed by a 
> good friend of mine with whom I worked at another firm about a decade before 
> Spectracom was founded, and was introduced at Spectracom when he moved there.
> 
> It's hilarious now, looking at the crude PC layouts, the PC cards that look 
> like they were separated with hatchets (in reality, they used heavy-duty, 
> office-type guillotine paper cutters), and the "definitely not near mil-spec" 
> hand soldering job using at least 5x the optimum amount of solder.  
> Spectracom didn't even have a dip-soldering operation, much less a 
> wave-soldering system.
> 
> It was a much, much simpler time, one rung up the ladder from hippies in a 
> basement
> 
> Charles
> 
> 
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Re: [time-nuts] Seeking Toyocom or NDK through hole oscillator information

[jimlux]

On 6/14/18 4:27 AM, Tim Shoppa wrote:

Quoting Wikipedia; 16.368 MHz is 16 times the 1.023 MHz C/A GPS signal chipping 
rate; multiplied by 96.25 to get the 1575.42 MHz L1 frequency and multiplied by 
75 to get the 1227.60 MHz L2 frequency.


Possibly something Trimble significant with the 16.368 MHz
frequency that I'm not yet aware of... if anyone would care
to speculate, please do.





A typical direct sampling receiver would sample the RF at 16.368, and 
that puts the L1 received signal nicely at fs/4.  The P code would 
overlap the sampling bandwidth of 8.184 MHz, but the C/A code fits well 
within that range. And, since it's not at "zero", any doppler just moves 
it from the center, but it's still "positive" frequency.



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Re: [time-nuts] Seeking Toyocom or NDK through hole oscillator information

[Tim Shoppa]

Quoting Wikipedia; 16.368 MHz is 16 times the 1.023 MHz C/A GPS signal chipping 
rate; multiplied by 96.25 to get the 1575.42 MHz L1 frequency and multiplied by 
75 to get the 1227.60 MHz L2 frequency.

> On Jun 14, 2018, at 1:53 AM, skipp isaham via time-nuts  
> wrote:
> 
> Seeking Toyocom or NDK through hole oscillator information
> 
> 
> Hello again to the group,
> 
> I'm looking for a Data Sheet or information that would provide
> the connection information for a (Epson) Toyocom TCO-519 or NDK
> PIA3003A Oscillator module, both are through hole mounting.
> 
> Both appear to be a reasonably conventional, but now a discontinued
> through-hole part, but I'm unable to find any same or similar data
> sheet information that would tell me how to use connect them. Both
> are 16.368 MHz
> 
> Appearance wise, they are both an approx 1 inch square, 3/8" high,
> silver metal covered oscillator module. Five through hole mounting
> connection leads on the bottom, one in each corner, the fifth lead
> is centered along the side between two corners.
> 
> A data sheet or even just the generic connection information with
> an idea of what each pin does would be wonderful. A few of these
> arrived in a parts donation box hand labeled "Trimble Development".
> 
> Possibly something Trimble significant with the 16.368 MHz
> frequency that I'm not yet aware of... if anyone would care
> to speculate, please do.
> 
> 
> Thank you in advance for your replies
> 
> cheers,
> skipp
> 
> direct Email skipp...@yahoo.com
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Re: [time-nuts] Spectracom 8140T Line Tap Schematic

[Julien Goodwin]

I'm somewhat tempted to take the schematic and see if I can fit it in
the comparatively tiny Pomona boxes, although I have far too many side
projects already, enough 10MHz taps, and I still need to do the terminators.

The VersaTaps are supposed to be an actual synthesizer IIRC.
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Re: [time-nuts] Raw phase data of super-5065

[Attila Kinali]

On Wed, 13 Jun 2018 08:19:58 -0700
 wrote:

> Would be interesting to see a long plot of the two 5065 against each
> other!

I had a look at Luciano's data and it's probably safe to say, that
the instability of the super-5065 would be the limit. The unmodified
5065 is incredibly stable (once you remove drift).

Attached are the two phase plots, both with quadratic drift removed.
The unmodified 5065A has a kind of weird ~18day undulation. I would
say it's an environmental effect, but the two cycles are too similar,
so I do not know what to think of it.

The super-5065 (5065B) has quite a few bigger frequency jumps, with
pretty stable phases in-between. My guess here would be that there
are no environmental effects and it is limited by instabilities in
the frequency discriminator electronics, ie offsets that show (close to)
discrete jumps. or that the lamp brightness changes.

Attila Kinali

-- 
It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
 -- Miss Matheson, The Diamond Age, Neil Stephenson
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