[hpsdr] SDR Clock Reference

[Steven Bible]

Hi Chuck,

Do you have a URL for Morion?

Please keep in mind the availablity for the average ham to purchase an OCXO.
OCXO's are not typically an off-the-shelf item.  Normally, they are made to
order.  And we all agree that the world is changing and this norm can
change.  Sure, you can check on price and availablity.  Please report back
to the list.

What we need is a list of possible surplus and purchable OCXOs and a
cook-off as to the performance of each.  Working with N8UR, we have already
been doing this.  I would like for us to determine the performance of these
oscillators on our own.  Take a look at N8UR's Time and Frequency
Measurement web site at:

    http://www.febo.com/time-freq/index.html

I want to be sure we choose a few OCXOs that are purchasable because we
cannot depend on the surplus market.  I find it unfair for hams that are
trying to reproduce our work to not be able to get their hands on stuff.

As to 10 MHz, (and as Rick mentions on another email also 5 MHz) is to be
used as a reference to lock your higher frequency oscillator.  That's what
Reflock II can do also.  See the r2_flex_01 code.

73,

- Steve, N7HPR
 (n7hpr at tapr.org)


> -----Original Message-----
> From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org]On Behalf
> Of Chuck Clark
> Sent: Tuesday, May 23, 2006 6:24 PM
> To: hpsdr at hpsdr.org
> Subject: [hpsdr] SDR Clock Reference
>
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Steve
>
> Did you look at Morion in St Petersburg?  It looks like they have higher
> performance OCXO's than Crystek.  Their prices for TCXOs' are
> reasonable, I haven't gotten a price on an OCXO model, should I get one?
>
> Is 10 MHz the correct frequency?  I may be rehashing old discussions, if
> so I appologize.  You can get better spurious from the DDS with a higher
> frequency clock rather than using the internal multipliers.  I think the
> AD9959 can use a 500 MHz clock.  I think the easiest way to develop this
> is a 125 MHz crystal multiplied to 500 MHz.  The 125 MHz can be locked
> to the 10KHz from the GPS receiver directly or through a 10 MHz standard.
>
> I will admit that my desires are towards a preimium VHF/UHF radio rather
> than HF.  I may be able to make some measurements next month to show the
> performance improvemnt, if anyone is interested.
>
> Chuck
> AF8Z
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