Re: [time-nuts] Are the days of buying a crystal numbered?

2010-02-22 Thread Magnus Danielson

Hal Murray wrote:
The trick of including a PLL in an oscillator package has been around for a 
while.


The initial ones were programmed at the factory or distributor.  The idea was 
to avoid the long wait while they polished the crystal to your specific 
frequency.  They stocked them in a handful of frequencies and programmed the 
right one when they got your order.


Early ones had a bad reputation due to lots of jitter.


They where pretty bad. It got worse that the reps where denying that 
there was a problem. Single-cycle jitter (which was relevant for that 
app) was clearly vissible and didn't take much effort to measure and 
toss the samples over the shoulder.


But they where fairly simple PLL designs.

One case I saw would allow the PLL to oscillate badly sometimes when you 
started it. For that app it was totally useless.


These look good to 
me.  (But I don't work in this area so maybe their marketing stuff fooled me.)


This is time-nuts.  What is good for one application will be useless for 
another.


Spurs might be a problem, it depends on your application and the exact 
numbers of the target frequency and the crystal frequency.


I could not agree more. These are good contribution to the design-scope 
for some applications.


Cheers,
Magnus

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Re: [time-nuts] Are the days of buying a crystal numbered?

2010-02-22 Thread Hal Murray

The trick of including a PLL in an oscillator package has been around for a 
while.

The initial ones were programmed at the factory or distributor.  The idea was 
to avoid the long wait while they polished the crystal to your specific 
frequency.  They stocked them in a handful of frequencies and programmed the 
right one when they got your order.

Early ones had a bad reputation due to lots of jitter.  These look good to 
me.  (But I don't work in this area so maybe their marketing stuff fooled me.)

This is time-nuts.  What is good for one application will be useless for 
another.

Spurs might be a problem, it depends on your application and the exact 
numbers of the target frequency and the crystal frequency.




-- 
These are my opinions, not necessarily my employer's.  I hate spam.




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Re: [time-nuts] Are the days of buying a crystal numbered?

2010-02-22 Thread life speed
From: Henry Hallam 
Subject: Re: [time-nuts] Are the days of buying a crystal numbered?

Anybody know what its performance is like under vibration?

Henry

Just guessing here . . .  poor

Unless it is a specifically G-hardened device, it is sure to be microphonic.  
All crystals are.  G-hardened is just somewhat better.

Clay


  

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Re: [time-nuts] Are the days of buying a crystal numbered?

2010-02-22 Thread Bob Camp
Hi

The fixed frequency XO in the package will have a G sensitivity like any
other strip crystal oscillator. That could be as bad as 1x10-8/g. It could
be an order of magnitude better. It could also vary from unit to unit.

Bob

-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Henry Hallam
Sent: Monday, February 22, 2010 11:33 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Are the days of buying a crystal numbered?

Anybody know what its performance is like under vibration?

Henry

On Mon, Feb 22, 2010 at 5:32 AM, Marco IK1ODO -2  wrote:
> There are several kits around using the Si570 serires of oscillators. I
> built the FA-SY and it's very nice:
>
> http://www.funkamateur.de/download-files/dl1fac_FA-SY-Umbau.pdf
>
> FA-SY includes a program to trum the frequency, and a simple oven to heat
> the oscillator. It stays in some parts in 10^9, and is spectrally very
> clean. I expected it to be much worse :-) - I may post some plots, if
anyone
> is interested.
>
> Then see http://www.mydarc.de/dg8saq/SI570/index.shtml and
> http://www.sdr-kits.net/USB/USB_Description.html
>
> 73 - Marco IK1ODO
>
>
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>



-- 
Henry Hallam

Sent from my Laptop

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Re: [time-nuts] Are the days of buying a crystal numbered?

2010-02-22 Thread Henry Hallam
Anybody know what its performance is like under vibration?

Henry

On Mon, Feb 22, 2010 at 5:32 AM, Marco IK1ODO -2  wrote:
> There are several kits around using the Si570 serires of oscillators. I
> built the FA-SY and it's very nice:
>
> http://www.funkamateur.de/download-files/dl1fac_FA-SY-Umbau.pdf
>
> FA-SY includes a program to trum the frequency, and a simple oven to heat
> the oscillator. It stays in some parts in 10^9, and is spectrally very
> clean. I expected it to be much worse :-) - I may post some plots, if anyone
> is interested.
>
> Then see http://www.mydarc.de/dg8saq/SI570/index.shtml and
> http://www.sdr-kits.net/USB/USB_Description.html
>
> 73 - Marco IK1ODO
>
>
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> 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.
>



-- 
Henry Hallam

Sent from my Laptop

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Re: [time-nuts] Are the days of buying a crystal numbered?

2010-02-22 Thread Marco IK1ODO -2
There are several kits around using the Si570 serires of oscillators. 
I built the FA-SY and it's very nice:


http://www.funkamateur.de/download-files/dl1fac_FA-SY-Umbau.pdf

FA-SY includes a program to trum the frequency, and a simple oven to 
heat the oscillator. It stays in some parts in 10^9, and is 
spectrally very clean. I expected it to be much worse :-) - I may 
post some plots, if anyone is interested.


Then see http://www.mydarc.de/dg8saq/SI570/index.shtml and 
http://www.sdr-kits.net/USB/USB_Description.html


73 - Marco IK1ODO


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Re: [time-nuts] Are the days of buying a crystal numbered?

2010-02-22 Thread Dave Baxter
It's a very good device.

Used in 1000's of "Softrock" SDR's arround the world now.

Control software (by various means, including USB) can be found courtesy
of the Softrock40 group, on Yahoo.

http://groups.yahoo.com/group/softrock40/

73.

Dave G0WBX.


> --
> 
> Message: 6
> Date: Mon, 22 Feb 2010 21:59:44 +1100
> From: "Gerald Molenkamp" 
> Subject: [time-nuts] Are the days of buying a crystal numbered?
> To: 
> Message-ID: <50d403a38069bf4196f41887738c03ee544...@companyweb>
> Content-Type: text/plain; charset="us-ascii"
> 
> Hi All,
>  
> Found this interesting device last week while looking for a 
> basic PLL to replace a crystal for an IF offset. Has anyone 
> experimented with the
> si570/si571 yet?
>  
> www.silabs.com/Support%20Documents/TechnicalDocs/
> <http://www.silabs.com/Support%20Documents/TechnicalDocs/Si570.pdf>
> Si570.pdf
>  
> Regards
>  
>  
> Gerald
>  
> VK3GJM

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Re: [time-nuts] Are the days of buying a crystal numbered?

2010-02-22 Thread Raj
I built a kit and found that it wanders 50 Hz at 10MHz.

http://www.cliftonlaboratories.com/si570_kit_from_k5bcq.htm

 
>Found this interesting device last week while looking for a basic PLL to
>replace a crystal for an IF offset. Has anyone experimented with the
>si570/si571 yet?
> 
>www.silabs.com/Support%20Documents/TechnicalDocs/
>
>Si570.pdf
> 
>Regards
> 
> 
>Gerald
> 
>VK3GJM

-- 
Raj, VU2ZAP
Bangalore, India. 


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[time-nuts] Are the days of buying a crystal numbered?

2010-02-22 Thread Gerald Molenkamp
Hi All,
 
Found this interesting device last week while looking for a basic PLL to
replace a crystal for an IF offset. Has anyone experimented with the
si570/si571 yet?
 
www.silabs.com/Support%20Documents/TechnicalDocs/

Si570.pdf
 
Regards
 
 
Gerald
 
VK3GJM
 
 

 

 
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