[time-nuts] GPSDOs with 10.23 MHz output?

[AC0XU (Jim)]

Time-nuts-

I recall seeing a few models of GPSDOs that have 10.23 MHz output. Now when I 
want one I am not having any luck. Any recommendations?

Thanks-
Jim


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Re: [time-nuts] Are there SC-crystals out there in the wild that are not Overtone?

[Gerhard Hoffmann]

Am 26.02.20 um 15:22 schrieb Attila Kinali via time-nuts:

Do you know what the two coils/transformers that were glued to the
outside of the inner oven were for?


I guess they are part of the 5 -> 10 MHz doubler



Bernd Neubig has written a few documents on how to measure crystals
properly, which should be available from Axtal's website, if I'm not
mistaken.


Yes, I mentionend the Quarzkochbuch above. There was a nonstandard

solution proposed by Detleff Burchard in UKW-Berichte / VHF Communications

4/92 but I can't find my copy. I had built the head some 20 years ago

and it seemed to work. The drawback was that one had to compensate C0,

at least at 100 MHz.

regards, Gerhard


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Re: [time-nuts] 5.115 MHz / 10.23 MHz wanted

[Azelio Boriani via time-nuts]

krystaly.cz hosts also a collection of crystal oscillators' and oven
controllers' schematics:



On Wed, Feb 26, 2020 at 10:37 AM Clint Jay via time-nuts
 wrote:
>
> I have seen 10.23 parts somewhere but can't remember the application.
>
> If you can't track one down there's still a couple of reasonably priced
> options for custom crystals, you can have them ground by a czech company,
> www.krystaly.cz/en
>
> On Wed, 26 Feb 2020, 09:26 Tom Van Baak via time-nuts, <
> time-nuts@lists.febo.com> wrote:
>
> > For a DIY project I'd like a 5.115 MHz OCXO. That weird-looking number
> > is half the basic 10.23 MHz GPS chip rate.
> >
> > I realize it's trivial to create 5.115 MHz with a DDS chip, a function
> > generator, synthesizer, or even an aggressive phase microstepper. But in
> > this case, if possible, I'd prefer a simple single part; a plain old XO
> > or OCXO solution. Do any of you know where to get a 5.115 MHz crystal or
> > oscillator?
> >
> > I'm pretty sure that I've seen one-off surplus 10.23 MHz or 5.115 MHz
> > OCXO on eBay but I never thought to bid on them because the frequency
> > was strange. If you saw one, and "bought before you thought", let me know.
> >
> > Thanks,
> > /tvb
> >
> >
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Re: [time-nuts] Are there SC-crystals out there in the wild that are not Overtone?

[Attila Kinali via time-nuts]

Hoi Gerhard!

On Wed, 26 Feb 2020 01:42:11 +0100
Gerhard Hoffmann via time-nuts  wrote:

> Pics are there:
> 
> < 
> https://www.flickr.com/photos/137684711@N07/49585174873/in/album-72157662535945536/
>  
>     >

Nice pictures! Thanks!

Do you know what the two coils/transformers that were glued to the
outside of the inner oven were for?

 
> But I could not see anything at 1 or 1. MHz, so it should be a 
> fundamental crystal?

Judging from the specs, very unlikely. The short-term and long-term
stability are consistent with what I expect of an 3rd overtone 5MHz
SC cut crystal. The lower Q of a fundamental mode crystal would result
in a higher close in phase noise and the thinner plate would lead to
a higher aging rate at tau of one day. I can see two reasons for you
to not see the fundamental mode: Either your measurement setup was not
done properly to measure quartz crystals (see Bob's comment on impedance)
or they manufactured the crystal for low fundamental mode.

Bernd Neubig has written a few documents on how to measure crystals
properly, which should be available from Axtal's website, if I'm not
mistaken.

Attila Kinali

-- 
In science if you know what you are doing you should not be doing it.
In engineering if you do not know what you are doing you should not be doing it.
-- Richard W. Hamming, The Art of Doing Science and Engineering

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Re: [time-nuts] 5.115 MHz / 10.23 MHz wanted

[Scott Newell via time-nuts]

At 03:24 AM 2/26/2020, Tom Van Baak via time-nuts wrote:

aggressive phase microstepper. But in this case, if possible, I'd 
prefer a simple single part; a plain old XO or OCXO solution. Do any 
of you know where to get a 5.115 MHz crystal or oscillator?


Did the tbolt happen to use one? I've got a dead TAPR tbolt from a 
lightning strike that I can rob from if needed.


--
newell  N5TNL 



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Re: [time-nuts] 5.115 MHz / 10.23 MHz wanted

[ew via time-nuts]

The first HP10544 I held in my hand  was 10.23 MHz part of the GPS project.
Bert Kehren
In a message dated 2/26/2020 4:26:42 AM Eastern Standard Time, 
time-nuts@lists.febo.com writes:

For a DIY project I'd like a 5.115 MHz OCXO. That weird-looking number is half 
the basic 10.23 MHz GPS chip rate.
I realize it's trivial to create 5.115 MHz with a DDS chip, a function 
generator, synthesizer, or even an aggressive phase microstepper. But in this 
case, if possible, I'd prefer a simple single part; a plain old XO or OCXO 
solution. Do any of you know where to get a 5.115 MHz crystal or oscillator?
I'm pretty sure that I've seen one-off surplus 10.23 MHz or 5.115 MHz OCXO on 
eBay but I never thought to bid on them because the frequency was strange. If 
you saw one, and "bought before you thought", let me know.
Thanks,/tvb

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Re: [time-nuts] 5.115 MHz / 10.23 MHz wanted

[Mark Huffstutter via time-nuts]

And a 10.23 in HC-16


(CRY) 010.23000





> For a DIY project I'd like a 5.115 MHz OCXO. That weird-looking number
> is half the basic 10.23 MHz GPS chip rate.
>
> I realize it's trivial to create 5.115 MHz with a DDS chip, a function
> generator, synthesizer, or even an aggressive phase microstepper. But in
> this case, if possible, I'd prefer a simple single part; a plain old XO
> or OCXO solution. Do any of you know where to get a 5.115 MHz crystal or
> oscillator?
>
> I'm pretty sure that I've seen one-off surplus 10.23 MHz or 5.115 MHz
> OCXO on eBay but I never thought to bid on them because the frequency
> was strange. If you saw one, and "bought before you thought", let me know.
>
> Thanks,
> /tvb
>
>
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> time-nuts mailing list -- time-nuts@lists.febo.com
> To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.
>



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Re: [time-nuts] 5.115 MHz / 10.23 MHz wanted

[Mark Huffstutter via time-nuts]

Hi Tom,

   I ran across one the other day, actually, looking for something else.

   Surplus Sales of Nebraska has an HC-6 crystal as p/n (CRY) 005.115000

   

Probably not exactly what You were looking for, but a start!

Mark



> For a DIY project I'd like a 5.115 MHz OCXO. That weird-looking number
> is half the basic 10.23 MHz GPS chip rate.
>
> I realize it's trivial to create 5.115 MHz with a DDS chip, a function
> generator, synthesizer, or even an aggressive phase microstepper. But in
> this case, if possible, I'd prefer a simple single part; a plain old XO
> or OCXO solution. Do any of you know where to get a 5.115 MHz crystal or
> oscillator?
>
> I'm pretty sure that I've seen one-off surplus 10.23 MHz or 5.115 MHz
> OCXO on eBay but I never thought to bid on them because the frequency
> was strange. If you saw one, and "bought before you thought", let me know.
>
> Thanks,
> /tvb
>
>
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> To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.
>



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Re: [time-nuts] 5.115 MHz / 10.23 MHz wanted

[Gerhard Hoffmann via time-nuts]

Am 26.02.20 um 10:24 schrieb Tom Van Baak via time-nuts:


I'm pretty sure that I've seen one-off surplus 10.23 MHz or 5.115 MHz 
OCXO on eBay but I never thought to bid on them because the frequency 
was strange. If you saw one, and "bought before you thought", let me 
know.


IIRC someone has offered a 10.23 MHz variant of the 10811 some years ago 
on the list.


Gerhard


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Re: [time-nuts] 5.115 MHz / 10.23 MHz wanted

[Clint Jay via time-nuts]

I have seen 10.23 parts somewhere but can't remember the application.

If you can't track one down there's still a couple of reasonably priced
options for custom crystals, you can have them ground by a czech company,
www.krystaly.cz/en

On Wed, 26 Feb 2020, 09:26 Tom Van Baak via time-nuts, <
time-nuts@lists.febo.com> wrote:

> For a DIY project I'd like a 5.115 MHz OCXO. That weird-looking number
> is half the basic 10.23 MHz GPS chip rate.
>
> I realize it's trivial to create 5.115 MHz with a DDS chip, a function
> generator, synthesizer, or even an aggressive phase microstepper. But in
> this case, if possible, I'd prefer a simple single part; a plain old XO
> or OCXO solution. Do any of you know where to get a 5.115 MHz crystal or
> oscillator?
>
> I'm pretty sure that I've seen one-off surplus 10.23 MHz or 5.115 MHz
> OCXO on eBay but I never thought to bid on them because the frequency
> was strange. If you saw one, and "bought before you thought", let me know.
>
> Thanks,
> /tvb
>
>
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> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.
>
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[time-nuts] 5.115 MHz / 10.23 MHz wanted

[Tom Van Baak via time-nuts]

For a DIY project I'd like a 5.115 MHz OCXO. That weird-looking number 
is half the basic 10.23 MHz GPS chip rate.


I realize it's trivial to create 5.115 MHz with a DDS chip, a function 
generator, synthesizer, or even an aggressive phase microstepper. But in 
this case, if possible, I'd prefer a simple single part; a plain old XO 
or OCXO solution. Do any of you know where to get a 5.115 MHz crystal or 
oscillator?


I'm pretty sure that I've seen one-off surplus 10.23 MHz or 5.115 MHz 
OCXO on eBay but I never thought to bid on them because the frequency 
was strange. If you saw one, and "bought before you thought", let me know.


Thanks,
/tvb


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