Re: [time-nuts] advice for buying VCXO

[Can Altineller]

Hello Jim,

Yes i need a VCXO or even a VCTCXO. However when I search them on ebay,
unfortunately, since they included every term for XO, I am lost in the
noise.

Any recomendations for buying VCXO's that are surplus, and not ebay?

Thank you very much,
Can

On Mon, Oct 5, 2015 at 11:48 PM, Jim Harman  wrote:

> Only the first oscillator in your list is voltage controllable (VC). If you
> want to steer it with a GPS as we have been discussing, it needs to be
> voltage controllable.
>
> You will also want to consider the mounting and whether you are able to
> solder surface mount devices like the second one in your list.
>
> You will also need to consider what power supply voltage(s) you have
> available and whether you want sine or TTL output voltage.
>
> These parameters will narrow your selection considerably.
>
> Also if you have the power available you will get much better stability if
> the oscillator has an oven (OCXO) Pretty good surplus OCXOs are available
> for less than $25.00. With an OCXO you might also look for one that has a
> reference voltage output. If you can use this voltage to power the analog
> part of your tuning circuitry, you won't have to worry about the effect of
> power supply stability on that portion of your system.
>
> The stability of any surplus oscillator is pretty much a crap shoot. You
> can get them cheap but you might have to sort through a few to find one
> that is good enough for your purposes..
>
>
>
> On Mon, Oct 5, 2015 at 8:22 AM, Can Altineller 
> wrote:
>
> > Hello,
> >
> > I am want to buy some VCXO's but really simple and cheap ones. I
> requested
> > a quote from goledge.com and their prices are around 180GBP per unit,
> and
> > I
> > dont want to pay that much given you can buy a rubidium standard for
> > comparable prices.
> >
> > I looked on ebay and found those candidates:
> >
> >
> >
> http://www.ebay.com/itm/12-8MHz-NKG3001B-VC-TCXO-DIP-NDK-New-x2pcs-Oscillator-VCTCXO-VCXO-TCXO-GPSDO/310376642284?_trksid=p2045573.c100033.m2042&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D32831%26meid%3D822a498fde5a4f19b8d5909a2b8496c5%26pid%3D100033%26rk%3D1%26rkt%3D3%26sd%3D310376642284
> >
> >
> >
> http://www.ebay.com/itm/3-PCS-TCXO-6663-12-8-TCXO-25-4-x-29-21-x-10-03-SMT-VECTRON-INTERNATIONAL-/221657383361?hash=item339bcf41c1
> >
> >
> >
> http://www.ebay.com/itm/Free-shipping-ONE-PIECE-PRECISION-0-3ppm-12-8MHz-12-8M-DIP-TCXO-/141771669896?hash=item2102400188
> >
> > The third one is nice, it says 0.3ppm, but I am not sure if the specs are
> > true.
> >
> > Any recomendations on where to source cheap vcxo or vctcxo's? 10mhz or
> 12.8
> > mhz is ok, and <1ppm would be nice.
> >
> > Best regards,
> > C.A.
> > ___
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> >
>
>
>
> --
>
> --Jim Harman
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Re: [time-nuts] Looking for ECL divide by 3 with symmetry

[Alex Pummer]

symmetry is better to look with spectrum analyzer, at good symmetry you 
should not see  second harmonic

73
KJ6UHN
Alex

 On 10/6/2015 12:28 AM, ed breya wrote:
Problem solved - one missing connection was fixed, and it now runs 
just fine. Symmetry looks good on a scope, and the toggle rate is 
plenty enough. It runs OK to beyond 120 MHz input.


Ed
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Re: [time-nuts] advice for buying VCXO

[Jim Lux]

On 10/6/15 5:46 AM, Can Altineller wrote:

Hello Jim,

Yes i need a VCXO or even a VCTCXO. However when I search them on ebay,
unfortunately, since they included every term for XO, I am lost in the
noise.

Any recomendations for buying VCXO's that are surplus, and not ebay?





do you want a Ovenized VCXO? or any VCXO? Is there a particular 
performance you need?  There's lots of inexpensive brand new VCXOs 
available.


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Re: [time-nuts] advice for buying VCXO

[Can Altineller]

Hello,

I was hoping for a cheap VCXO. I think those ovenized ones are more
expensive.

Where would I get a brand new VCXO, that has < 1ppm, and specs that are
true. (as in the declared spec would match the actual performance, these
days when we buy from ebay, or aliexpress this is hardly the case)

Best regards,
-Can

On Tue, Oct 6, 2015 at 8:22 PM, Jim Lux  wrote:

> On 10/6/15 5:46 AM, Can Altineller wrote:
>
>> Hello Jim,
>>
>> Yes i need a VCXO or even a VCTCXO. However when I search them on ebay,
>> unfortunately, since they included every term for XO, I am lost in the
>> noise.
>>
>> Any recomendations for buying VCXO's that are surplus, and not ebay?
>>
>>
>
>
> do you want a Ovenized VCXO? or any VCXO? Is there a particular
> performance you need?  There's lots of inexpensive brand new VCXOs
> available.
>
>
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Re: [time-nuts] advice for buying VCXO

[Chris Caudle]

On Tue, October 6, 2015 2:46 pm, Can Altineller wrote:
> Where would I get a brand new VCXO, that has < 1ppm, and specs that are
> true.

Where does the requirement for < 1ppm come from?  I assume by that you
mean center of control range within 1ppm of nominal frequency.  What pull
range will you be using?  Across what temperature range?

The features you have asked for are very vague, but using just those I
searched the crystals and oscillators section of Digikey for oscillators
at 10MHz or 12.8MHz, VCXO or VCTCXO, and got 155 results.
The top of the list is a VCTCXO from Abracon, 12.8MHz, +/- 2.5ppm
stability for US $3.19.

Searching for +/- 1ppm or less drops the number of devices to 41, top of
the list is Connor-Winfield +/- 0.1ppm for US $19.95.

This was under 1 minute of searching, so I'm curious how you were
searching that came up so empty.

-- 
Chris Caudle




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Re: [time-nuts] Looking for ECL divide by 3 with symmetry

[ed breya]

Problem solved - one missing connection was fixed, and it now runs just 
fine. Symmetry looks good on a scope, and the toggle rate is plenty 
enough. It runs OK to beyond 120 MHz input.


Ed
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Re: [time-nuts] Iridium source?

[Stewart Cobb]

The use of Iridium satellite signals for timing, location, and
position-based authentication is being commercialized by a startup called
Satelles. The technology is known as Satelles Timing and Location, or STL.



Prototype STL timing systems are providing PPS with accuracy better than 1
microsecond. This is expected to improve as the technology evolves.

Full disclosure: Satelles is my employer. We have submitted a paper on STL
timing to PTTI 2016. Don't know yet whether it was accepted.

Cheers!
--Stu
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Re: [time-nuts] advice for buying VCXO

[Jim Lux]

On 10/6/15 12:46 PM, Can Altineller wrote:

Hello,

I was hoping for a cheap VCXO. I think those ovenized ones are more
expensive.

Where would I get a brand new VCXO, that has < 1ppm, and specs that are
true. (as in the declared spec would match the actual performance, these
days when we buy from ebay, or aliexpress this is hardly the case)



There's tons of vcxos from Digikey.. just searching for VCXO and 
restricting it to 10 MHz turns up about 17 parts.


choosing the first one in the list
http://www.foxonline.com/pdfs/FVXO_HC53.pdf

50ppm pulling range

This happens to be a ceramic resonator, so the close in noise is 
probably not so hot.


But some checking at Digikey and Mouser and the like should turn up 
soemething.



How about an Abracon ASVV series SMT at 20 MHz for $2.98 Qty 1?

or a VCTCXO AST3TQ-V-10.000MHz-28 for $19.25 Qty 1 from Digikey.
280 ppb from -40 to +85
10 ppm pulling range..


Abracon is in southern california, for what it's worth.



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Re: [time-nuts] advice for buying VCXO

[Bob Camp]

Hi

If you are looking for a temperature stability of better than 1 ppm, then the 
device
you are looking for is a VCTCXO. They are more commonly listed as a TCXO. 
That’s because most TCXO’s these days have a voltage control input. 

A quick check on the Mouser site shows 103 items that are stocked in various 
stabilities. Running against a TC of <= 1 ppm knocks that down to 14 items.

Bob

> On Oct 6, 2015, at 3:46 PM, Can Altineller  wrote:
> 
> Hello,
> 
> I was hoping for a cheap VCXO. I think those ovenized ones are more
> expensive.
> 
> Where would I get a brand new VCXO, that has < 1ppm, and specs that are
> true. (as in the declared spec would match the actual performance, these
> days when we buy from ebay, or aliexpress this is hardly the case)
> 
> Best regards,
> -Can
> 
> On Tue, Oct 6, 2015 at 8:22 PM, Jim Lux  wrote:
> 
>> On 10/6/15 5:46 AM, Can Altineller wrote:
>> 
>>> Hello Jim,
>>> 
>>> Yes i need a VCXO or even a VCTCXO. However when I search them on ebay,
>>> unfortunately, since they included every term for XO, I am lost in the
>>> noise.
>>> 
>>> Any recomendations for buying VCXO's that are surplus, and not ebay?
>>> 
>>> 
>> 
>> 
>> do you want a Ovenized VCXO? or any VCXO? Is there a particular
>> performance you need?  There's lots of inexpensive brand new VCXOs
>> available.
>> 
>> 
>> ___
>> time-nuts mailing list -- time-nuts@febo.com
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>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>> 
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