[time-nuts] Introduction and info about a Lucent RFTG

Rex rexa at sonic.net
Fri Jul 4 21:38:15 EDT 2014

Several years ago there were a number of these showing up pretty cheap 
on eBay, so I bought one. As I recall there were a couple of similar 
versions with some differences so take this recollection with a grain of 

I did some tracing of the internals on the one I had and found the 
rubidium unit had no connection on the tuning pin (C-field) to the board 
circuits. So it was free running, only for backup in the system, and not 
GPS lockable. I don't remember there being any useful power supply in 
the box, so my advice would be to remove the LPRO rubidium and use it 
directly. (It does need heat sinking, so maybe some parts of the box 
mechanicals are useful.) In my opinion, working out how to use the 
supporting circuit board is not worth the effort, unless you really have 
a need for the 15 MHz they create.

You should be able to find documentation for the internal module LPRO 
rubidiums on the web. I haven't looked today but KO4BB site probably has it.

On 7/4/2014 1:47 PM, Denver wrote:
> Hi all,
> My name is Denver I am currently a freshman in college and the time bug has
> struck me. I recently acquired a Lucent RFTG on ebay to have a time
> standard for my lab(and yes already realize its 15MHz output but may be
> able to change that and or just use the 10MHz test point from the rubidium
> source). I made a power connector for it. Now that I have power applied and
> sort of verified its operation I am looking for more info about the
> connectors on the front panel. I have the KO4BB user documentation on it
> but it doesn't mention much about connectors and pinouts. I also have
> already searched the group for other mentions of the RFTG but all I am able
> to come up with is some of the newer models the -m and such. Maybe one of
> you could help point me in the right direction or give me some other ideas
> on how to get more use out of this unit.
> Thanks in advance
> -Denver
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