Thank Rex and Paul for the replies
From what I understand my RFTG has a GPSDO on oneside that has a crystal
oven inside it, and a rubidium source on the other side. The rubidium
source takes a signal from the GPSDO side and uses that for longer term
stability. But If I am understanding you, Rex, that the rubidium is really
not a gps locked oscillator and just a free running device. I will start
tearing down the unit to figure out if I can make something more usable out
of it. I will make sure to document it and post it somewhere on the web. I
read somewhere on this group that there is a way to bypass the 15MHz
generating circuit and use the existing hardware amplifier and distribution
at 10MHz. I will also be looking into that as well. Rex, you are correct as
there is no power supply inside and I have it hooked up to a open frame
type switching supply externally.
Paul - I will be setting up my GPS antenna shortly and trying to get it to
lock to GPS for a more precise reference.
Thanks all
-Denver
On Fri, Jul 4, 2014 at 9:38 PM, Rex r...@sonic.net wrote:
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 salt.
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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