[time-nuts] FE-5680A power

[Murray Greenman]

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 that before you power it up, 
you look inside and identify what regulators there are internally. They will 
be on the end PCB which holds the DB9 connector, and bolted to the heatsink 
block down the centre of the unit. If you've two regulators, one will be for 
+12V, the other +5V, and so just feed +15V. You should be able to trace the 
regulator inputs back to the connector to confirm.


If there is no +5V regulator (and I'd be surprised), then clearly you'll 
need to work out where to provide the +5V, and again I recommend tracing 
back from the power pins of some ICs to the connector to be sure.


Much better to be safe than sorry!

73,
Murray ZL1BPU


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Re: [time-nuts] FE-5680A

[Peter Bell]

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 Bene"  wrote:

> 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...
> Could please somebody tell me if my unit, depicted in this photo :
>
> http://www.sdradio.eu/images/FE-5680A.jpg
>
> is similar to the mentioned one ?
>
> Mine does not have any other qualifying number, after the P/N FE-5680A
>
> Thanks
>
> 73  Alberto  I2PHD
>
>
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Re: [time-nuts] FE-5680A

[Jose Camara]

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 it
upside down and watch a 4E-11 change).

Some other variants reportedly respond to the trimpot, others have real wide
range DDS, allow 3MHz if you set it so. Although output filter might need
tweaking if you are way off the intended range.



-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Peter Bell
Sent: Thursday, November 10, 2011 2:38 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A

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, 2011 6:17 AM,  wrote:
>
> 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 Standard Time,
> bell.pe...@gmail.com writes:
>
> 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. The current drain on the 5V line is  fairly
> low - about 90mA - the 15V will pull about 2A when the unit is  cold
> and then drops to 500-600mA once everything is warmed up.  Pin 3  is
> the lock indicator - driven low when locked.  The output (10MHz  sine)
> is present on pin 6, and appears immediately after power up -  although
> the frequency is not accurate until the lock pin is  asserted.
>
> The 4 digit prefix on the lower barcode is a date code - so  "S/N
> 0416-77234" would indicate a unit made in week 16 of  2004.
>
> Regards,
>
> Pete Bell
>
> On Fri, Nov 11, 2011 at 12:30  AM,   wrote:
> > 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
> >  ___
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> >
>
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Re: [time-nuts] FE-5680A

[Peter Bell]

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 a Xilimx PLD and the output comes from that - the RF for the snap
diode drive is generated  by mixing the 60MHz with the output of a DDS chip
and it seems that the  FM needed to interrogate the Rb cell is applied in
this loop rather than directly to the VCXO.

Overall, I think the output is quite a bit nicer than the old units.

On Nov 11, 2011 6:32 AM, "WB6BNQ"  wrote:
>
> 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 the logic in the unit. There are
> > no special power sequencing requirements, but you need both supplies
> > for the unit to operate. The current drain on the 5V line is fairly
> > low - about 90mA - the 15V will pull about 2A when the unit is cold
> > and then drops to 500-600mA once everything is warmed up.  Pin 3 is
> > the lock indicator - driven low when locked.  The output (10MHz sine)
> > is present on pin 6, and appears immediately after power up - although
> > the frequency is not accurate until the lock pin is asserted.
> >
> > The 4 digit prefix on the lower barcode is a date code - so "S/N
> > 0416-77234" would indicate a unit made in week 16 of 2004.
> >
> > Regards,
> >
> > Pete Bell
> >
> > On Fri, Nov 11, 2011 at 12:30 AM,   wrote:
> > > 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
> > > ___
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https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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> > >
> >
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>
>
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Re: [time-nuts] FE-5680A

[Alberto di Bene]

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...
Could please somebody tell me if my unit, depicted in this photo :

http://www.sdradio.eu/images/FE-5680A.jpg

is similar to the mentioned one ?

Mine does not have any other qualifying number, after the P/N FE-5680A

Thanks

73  Alberto  I2PHD


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Re: [time-nuts] FE-5680A

[Peter Bell]

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, 2011 6:17 AM,  wrote:
>
> 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 Standard Time,
> bell.pe...@gmail.com writes:
>
> 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. The current drain on the 5V line is  fairly
> low - about 90mA - the 15V will pull about 2A when the unit is  cold
> and then drops to 500-600mA once everything is warmed up.  Pin 3  is
> the lock indicator - driven low when locked.  The output (10MHz  sine)
> is present on pin 6, and appears immediately after power up -  although
> the frequency is not accurate until the lock pin is  asserted.
>
> The 4 digit prefix on the lower barcode is a date code - so  "S/N
> 0416-77234" would indicate a unit made in week 16 of  2004.
>
> Regards,
>
> Pete Bell
>
> On Fri, Nov 11, 2011 at 12:30  AM,   wrote:
> > 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
> >  ___
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> > To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the  instructions  there.
> >
>
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Re: [time-nuts] 10k year clock

[Hal Murray]

> You all there probably already know, but ... very interesting, IMHO. http://
> spectrum.ieee.org/geek-life/profiles/engineering-the-10-000year-clock/0 

Nice article.  Thanks.

They have a museum/office/store/whatever at Fort Mason in San Francisco.  It 
has prototypes of various sections.  It's as much art for geeks as clock.  
It's well worth a visit if you like that sort of thing.

Long Now is the buzzword: http://longnow.org/



-- 
These are my opinions, not necessarily my employer's.  I hate spam.




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Re: [time-nuts] FE-5680A

[WB6BNQ]

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 the logic in the unit. There are
> no special power sequencing requirements, but you need both supplies
> for the unit to operate. The current drain on the 5V line is fairly
> low - about 90mA - the 15V will pull about 2A when the unit is cold
> and then drops to 500-600mA once everything is warmed up.  Pin 3 is
> the lock indicator - driven low when locked.  The output (10MHz sine)
> is present on pin 6, and appears immediately after power up - although
> the frequency is not accurate until the lock pin is asserted.
>
> The 4 digit prefix on the lower barcode is a date code - so "S/N
> 0416-77234" would indicate a unit made in week 16 of 2004.
>
> Regards,
>
> Pete Bell
>
> On Fri, Nov 11, 2011 at 12:30 AM,   wrote:
> > 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
> > ___
> > time-nuts mailing list -- time-nuts@febo.com
> > To unsubscribe, go to 
> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
> >
>
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Re: [time-nuts] FE-5680A

[EWKehren]

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 Standard Time,  
bell.pe...@gmail.com writes:

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. The current drain on the 5V line is  fairly
low - about 90mA - the 15V will pull about 2A when the unit is  cold
and then drops to 500-600mA once everything is warmed up.  Pin 3  is
the lock indicator - driven low when locked.  The output (10MHz  sine)
is present on pin 6, and appears immediately after power up -  although
the frequency is not accurate until the lock pin is  asserted.

The 4 digit prefix on the lower barcode is a date code - so  "S/N
0416-77234" would indicate a unit made in week 16 of  2004.

Regards,

Pete Bell

On Fri, Nov 11, 2011 at 12:30  AM,   wrote:
> 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
>  ___
> time-nuts mailing list  -- time-nuts@febo.com
> To unsubscribe, go to  
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>

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Re: [time-nuts] FE-5680A

[Peter Bell]

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. The current drain on the 5V line is fairly
low - about 90mA - the 15V will pull about 2A when the unit is cold
and then drops to 500-600mA once everything is warmed up.  Pin 3 is
the lock indicator - driven low when locked.  The output (10MHz sine)
is present on pin 6, and appears immediately after power up - although
the frequency is not accurate until the lock pin is asserted.

The 4 digit prefix on the lower barcode is a date code - so "S/N
0416-77234" would indicate a unit made in week 16 of 2004.

Regards,

Pete Bell

On Fri, Nov 11, 2011 at 12:30 AM,   wrote:
> 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
> ___
> time-nuts mailing list -- time-nuts@febo.com
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Re: [time-nuts] FE-5680A

[EWKehren]

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  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 shielded switcher and  filter it 
well.

There seems to be different pinouts for different  FE-5680A part numbers,
too.

Jose


-Original  Message-
From: time-nuts-boun...@febo.com  [mailto:time-nuts-boun...@febo.com] On
Behalf Of ewkeh...@aol.com
Sent:  Thursday, November 10, 2011 8:31 AM
To: time-nuts@febo.com
Subject:  [time-nuts] FE-5680A

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
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Re: [time-nuts] FE-5680A

[Jose Camara]

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 shielded switcher and filter it well.

There seems to be different pinouts for different FE-5680A part numbers,
too.

Jose


-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of ewkeh...@aol.com
Sent: Thursday, November 10, 2011 8:31 AM
To: time-nuts@febo.com
Subject: [time-nuts] FE-5680A

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
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[time-nuts] Unused/Old stock PRS10's available via Timesource 2700

[Kevin Rosenberg]

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 @ $650 yielded what appeared to be a boxed 
Timesource 
2700 unit from 2001. Opening the 2700, there wasn't a speck a dust present in 
the ]
10 year old unit. Indeed, a PRS10 was inside with a manufacture date in 2001 
and a 
firmware of version 3.15 (too old for the TO setting option).

The PRS10 appears to do as well as my 2008 manufactured PRS10 based on the DS 
error
and resonance levels. While the firmware can't set TO to offset sawtooth nsec
from M12M GPS units, it can synchronize to an external PPS signal.

I hope this report helps those interested in acquiring a PRS10.

Kevin, KR5F



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[time-nuts] FE-5680A

[EWKehren]

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
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Re: [time-nuts] 10k year clock

[paul swed]

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  wrote:

> 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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[time-nuts] 10k year clock

[Marco IK1ODO -2]

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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