Hi Martin,
Martin Ewing wrote:
> Lin,
>
> I'm all in favor of a higher stability oscillator. Don't know if my
> enthusiasm stretches to $135, though!
>
> A couple of features I would be interested in for the oscillator:
>
> 1. Electrical trimming, so you can tweak the setting via an external
> voltage (pot.) Unfortunately, the electrically trimmed oscillators
> seem to have significantly worse phase noise, and that might be
> unacceptable.
>
>
It is electrically trimmed. Here's the trim app note:
"http://abracon.com/Support/AOCJY Vref App Note.pdf "
and phase plots are here:
"http://abracon.com/Precisiontiming/AOCJY Typ Phase Noise Plots.pdf"
Remember that this clocks a DDS. The highest output is 9.425, so
20*log(44.55/9.425) - so at the least, there's an extra 13.5 db
reduction of the phase noise from the oscillator.
Also, there is this nice write-up on Ten-Tec's site:
/radio.*tentec*.com/file_download/114/566_syn_article.pdf/
> 2. Phase lock to external (10 MHz) standard. This is particularly
> good for VHF / microwave folks.
>
Can be done using appropriate PLL circuitry.
> I don't expect we're going to get all these features from a vendor at
> a reasonable price. I do think it's a shame that TT didn't pay a few
> bucks more for a better TCXO as standard equipment. Maybe someone
> will home brew a solution?
>
That's what I'm attempting here.
> 73 Happy New Year
>
> Martin AA6E
>
> p.s. Thanks for the link to my blog post. I checked it out and found
> that all my figures had been wiped. They are now restored for your
> viewing pleasure!
>
>
No problem!
Lin,
WB1AIW
>
>>
>> _______________________________________________
>> TenTec mailing list
>> TenTec@contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>>
>>
>
>
>
>
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.722 / Virus Database: 270.14.123/2595 - Release Date: 12/31/09
> 03:52:00
>
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|