[time-nuts] Phase lock a VCXO to a standard 10MHz or to a GPS(1pps)

John Ackermann N8UR jra at febo.com
Wed Aug 3 14:05:42 EDT 2005

Brooke Clarke wrote:
> Hi:
> Steven Bible says the Reflock II might be available in September 2005, 
> see: http://gref.cfn.ist.utl.pt/cupido/reflock.html
> Have Fun,
> Brooke Clarke, N6GCE

I've kept fairly quiet about the Reflock II until we have more concrete 
details, but as Brooke mentioned we're a month or so away from 
production and TAPR plans to be showing it off at the Digital 
Communications Conference in Santa Ana, CA this September.

The Reflock II is a universal synthesizer that can lock an oscillator at 
virtually any frequency up to 250MHz (higher with a prescaler option) to 
any reference in the normal frequency standard range (I really don't 
know the upper limit), or to a 1pps source.

It's primarily designed for hams to use as a way to stabilize the local 
oscillator of a microwave transverter, but there are obviously lots of 
other interesting possibilities.

The phase performance of the GPS 1pps configuration hasn't been 
thoroughly tested; that's one of the things we'll be working on once 
more units are available.  Since the whole loop is in software 
(implemented in a CPLD chip) and the source is open, it will be easy to 
play around with the loop parameters, or even add fancier filtering 

We're pretty excited about this; together with the TADD-1 distribution 
amplifier, this marks TAPR's (re)entry into the T&F field.


PS -- time-nuts with an interest in digital communication (things like 
software defined radio) should consider attending the Digital 
Communications Conference.  Details are at http://www.tapr.org/dcc.

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