[time-nuts] 10MHz to 32MHz?
John Ackermann N8UR
jra at febo.com
Sat Apr 21 18:38:58 EDT 2007
There is a firmware image for the Reflock II that will lock a 10 MHz (or
other relatively-low-frequency) oscillator to PPS. The last time I
looked at it, it worked OK but not up to a "real" GPSDO -- which makes
sense since it's a pretty basic PLL. Luis Cupido has updated the PPS
code since then, though, and for all I know it might be much better now;
I haven't had a chance to test the new code.
Brooke Clarke said the following on 04/21/2007 06:29 PM:
> Hi John:
> Is there any data on how the Reflock II does as the basis of a GPSDO compared
> to other ones?
> Have Fun,
> Brooke Clarke
> w/Java http://www.PRC68.com
> w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
> John Ackermann N8UR wrote:
>> You might look at using a Reflock II
>> (http://www.tapr.org/kits_reflock_ii) to discipline a 32MHz VCXO from
>> your 10MHz. Unfortunately, the Clock-Block phase noise is nowhere near
>> good enough to use for an RF application, so that's not an option. :-(
>> Bruce Lane said the following on 04/21/2007 02:26 PM:
>>> Fellow time-clockers,
>>> I have an interesting (if a bit annoying) situation. I would like to use one of my existing GPS standards to improve stability on one of my HF transceivers. The problem is that said transceiver, for reasons unknown to me, uses a 32MHz reference oscillator.
>>> The highest GPS-lock frequency I have available is 10MHz. Suggestions for using this to produce a 32MHz reference would be welcome, as my skills for this kind of design are a bit rusty.
>>> Thanks much.
>>> Bruce Lane, Owner & Head Hardware Heavy,
>>> Blue Feather Technologies -- http://www.bluefeathertech.com
>>> kyrrin (at) bluefeathertech do/t c=o=m
>>> "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?"
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