You all there probably already know, but ... very interesting, IMHO.
http://spectrum.ieee.org/geek-life/profiles/engineering-the-10-000year-clock/0
73 - Marco IK1ODO
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Indeed a good read,
Sort of have my doubts about it surviving even 200 years actually.
But I suspect it won't be a real concern.
Regards
Paul
WB8TSL
On Thu, Nov 10, 2011 at 9:06 AM, Marco IK1ODO -2 ik1...@spin-it.com wrote:
You all there probably already know, but ... very interesting, IMHO.
I did purchase one of the New FE-5680A Rb's. Looking at packaging and
the housing it does look new. I have not powered it up because of +5 Volt on
pin 4. Does any one know its purpose and is there a power up sequence. Any
help will be appreciated.
Bert Kehren Miami
Hello Time Nuts,
I was interested in acquiring a second PRS10 Rb/OXCO oscillator. I purchased
one of the Brand New Symmetricom Timesource 2700 from the popular auction
site. From the time-nuts archive, there is a single message that the TS 2700
contain a PRS10 unit.
The Timesource 2700 purchase
I don't want to repost, but check
http://www.mail-archive.com/time-nuts@febo.com/msg37731.html. A timenuts
archive search or google will bring up that and many other resources.
If you can afford the extra 1/2W, a simple linear regulator generating the
5V from the 12V will do. If not, use a
Thank you Bert
In a message dated 11/10/2011 1:19:13 P.M. Eastern Standard Time,
camar...@quantacorp.com writes:
I don't want to repost, but check
http://www.mail-archive.com/time-nuts@febo.com/msg37731.html. A timenuts
archive search or google will bring up that and many other
Assuming it's the same as the units I have (two labels, with FEI P/N
217400-30352-1 on the upper label and two barcodes on the lower
label) then the +5V supply runs all the logic in the unit. There are
no special power sequencing requirements, but you need both supplies
for the unit to operate.
Thank you Peter
With Jose's and your input I will power it up in the morning. Mine has the
same part # and a date code 0330. Does yours respond to the trim pot, I
plan to bring out the tuning voltage to a modified Shera controller.
Bert
In a message dated 11/10/2011 5:03:07 P.M. Eastern
Peter,
Is the 10 MHz output a clean sinewave or does it look kind of trashy ?
thanks,
BillWB6BNQ
Peter Bell wrote:
Assuming it's the same as the units I have (two labels, with FEI P/N
217400-30352-1 on the upper label and two barcodes on the lower
label) then the +5V supply runs all
As far as I can see, the trimpot has no effect at all - the only frequency
trim on the unit is via the RS232 interface on pins 8 and 9 of the
connector I suspect this is adjusting the c field, but have not actually
verified this. It does definately change the output frequency, though.
On Nov 11,
On 11/10/2011 11:02 PM, Peter Bell wrote:
Assuming it's the same as the units I have (two labels, with FEI P/N
217400-30352-1 on the upper label and two barcodes on the lower
label) then the +5V supply runs all the logic in the unit.
It looks like there are many variants of the FE-5680A...
It's fairly clean - there is a bit of harmonic distortion since its being
generated from a 10MHz square wave via a simple LC filter but it seems
otherwuse quite nice. The RF architecture of these new units is quite
different from the old ones and the VCXO now runs at 60MHz this is divided
down in
On a couple that I bought there was no response to pots, the only frequency
adjust was through the DDS chip. I wanted to beat it to 1E-30 (kidding) but
had to be content with the DDS granularity close to 1E-13. Good enough,
considering all other sensitivities that will degrade beyond that (turn
Hi, Alberto
That appears to be one of the older units and may not require the 5V supply
on pin 4 - the simplest test is just to apply 15V and see if you get an
output on pin 6 at the right frequency. If so, you don't need the 5V
connection.
Regards,
Pete
On Nov 11, 2011 6:55 AM, Alberto di
It's my experience (and I have two FE-5680A and an FE-5680B, plus a couple
of FE-5650As) that you don't need a +5V supply with the FE-5680x devices,
just a +15V supply.
Now of course the model number has little to do with what we find inside -
there seem to be many variants - so I recommend
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