advice for buying VCXO
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:
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.
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 altineller@gmail.com 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:
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
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 j99harman@gmail.com 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 altineller@gmail.com
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:
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.
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.
--
--Jim Harman
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To unsubscribe, go to
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and follow the instructions there.
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.
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 jimlux@earthlink.net 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
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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
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 altineller@gmail.com 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 jimlux@earthlink.net 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
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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.
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.