[time-nuts] DMTD Question

EWKehren at aol.com EWKehren at aol.com
Mon Jan 25 14:11:13 UTC 2010


Going from 10 boards to 100 will reduce board cost by about 10%. Depending  
of the final version the qty. 10 cost will be either $ 29 or  36.    That 
is for mixer and counter board. Take out $9 if you  will not use the counter. 
Bert
 
 
In a message dated 1/25/2010 8:44:29 A.M. Eastern Standard Time,  
david.partridge at dsl.pipex.com writes:

Translation: FWIW == For What It's Worth

So,  one  hundred boards will probably cost only a little more than  ten
boards.

Dave

-----Original Message-----
From:  time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of  EWKehren at aol.com
Sent: 25 January 2010 13:27
To:  time-nuts at febo.com
Subject: Re: [time-nuts] DMTD Question

I am not  familiar with FWIW 100. Tell me more.  Thanks    Bert  Kehren


In a message dated 1/25/2010 8:22:30 A.M. Eastern Standard  Time,
david.partridge at dsl.pipex.com writes:

FWIW 100  boards  will likely cost not a great deal more (say $5-20 
depending
on board   size than ten. 

Dave
-----Original Message-----
From:   time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf  Of  EWKehren at aol.com
Sent: 25 January 2010 12:01
To:   time-nuts at febo.com
Subject: [time-nuts] DMTD Question

Allow me  to  add some comments to this subject.
Five month ago I set out to  make a DMTD  that would be $ 200 max and be 
such
that any one can  build it with readily  available parts. The unit also
includes   five counters yielding a  resolution of 1 E-15. Using five
counters  not only  gives Allan  Variance but also frequency difference.  
The
counter is powered by  the  computer through USB and also  transfers the 
data
to the PC. 
The  counter  section is less  than $30 of the total cost. The cost goal  
has
been  reached. The  counter does not have to be used if one wants  to use  
his
present  counter. The DM board does have high speed opto   couplers that
allow other  counters. Corby is presently using  that  approach. Cost does
not include the  offset Osc. but a low  cost  solution is in the works,
subject to evaluation.
Corby Dawson  and  Richard McCorkle have been major contributors.
The goal is 1 E-13  and  present tests show 3 E-13 right out of the box. 
Having Cesiums,  Rubidiums  and Xtal Osc. the best I have is a FTS 1000 
A-100
with 3.11  E-13 at one  second. I also think I will never have any   thing
better than the FTS  unit. That is why my goal is 1 E-13.
The  present unit uses SYPD-1 as mixers  but Corby will test the unit   
with a
couple of HP10514A's to evaluate  the Mixer contribution.
I  realize I am offending some of the purists on  this site but I wanted  to
keep cost down so I squeezed both channels on a  very compact  board
(4.3X2.9) and the counter is on a 4.3X2.3 board. How  ever if we  will  not
reach 1
E-13 with this approach I have a  fallback  using individual  boards for 
each
channel still meeting the  cost  goal. Other Mixers will also be  evaluated,
like the SRA1 since   price and availability of the HP10514A/B will not  
help
the cost   goal.
1 E-13 should satisfy 95% of time-nuts and at $200 including  PC   boards. 
The second board with some changes hopefully will  be assembled  this week
for testing and based on its results a third  board will go   to 
ExpressPCB. 
It is moving slower than what I  had hoped for, but 3 E-13  right out of the
box with no special  magnetic shielding or power supply  decoupling gives me
hope.
PC  boards will be the major cost factor, for  my calculations I assume in  
my
calculations that ten boards will be ordered  at a  time.

Bert Kehren     Miami
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