Bob Camp | 1 Mar 01:20 2012
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Re: AD9850 boards

Hi

They look like part of an eval kit.  The docs on the kit might be out there.

Bob

On Feb 29, 2012, at 5:47 PM, Dan Rae <danrae@...> wrote:

> On 2/29/2012 1:42 PM, Don Latham wrote:
>> Dunno if you have seen this on ebay:
>> 260967834514
>> It's an AD9850 with a 125 MHz crystal mounted up on a .1 spacing board
>> 
> There are several vendors selling similar things.  I bought a couple and have just pulled the 9850 off one
for another project of mine.  Build quality is a bit odd, and documentation is extremely variable to be polite.
> 
> And the 9850 was good :^)
> 
> Dan
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts@...
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.

Bob Camp | 1 Mar 01:24 2012
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Re: 5680A what is a reasonable case temp ?

Hi

If it is a normal FE it is pretty close at 15 minutes and quite good after an hour or so. It certainly will beat
the original OCXO at at hour. You might just run it when the counter is on and forget about running it in the
standby mode.

Bob

On Feb 29, 2012, at 1:15 PM, Chris Albertson
<albertson.chris@...> wrote:

> That is one of the better uses for a 5680.  I have a counter that is
> non-function because some one salvd the HP OCXO from it and I'm
> thinking that a 5680 would fit inside.   But then I thought again and
> the 5680 can fit outside.
> 
> One problem I think with your setup is that the 5680' temperature will
> change abruptly when you take the counter off standby.   You might
> have to wait 15 or 20 minutes for it to be stable.    It think it is
> easy to just run the fan at the exact same minimum rate all the time
> I put a temperature sensor in the 5680 and use a comparitor to turn
> the fan off and on.  The 5680 needs 15 volts so I dropped some volts
> with an LM317 regulator  I adjust the regulator voltage so the fan
> does not make to much noise and the lm311 swiches the fan on/off as
> required.  So there is never an abrupt change.  and the fan run no
> more than it absolutely needs to.   I had to add a positive feedback
> resistor to reduce the cycle rate.
> 
> On Wed, Feb 29, 2012 at 4:15 AM, Peter Gottlieb <nerd@...> wrote:
>> I am fitting one of these into a HP 5335A counter.  The project became a bit
(Continue reading)

Bob Camp | 1 Mar 01:34 2012
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Re: AD9850 boards

Hi

The 9851 is a bit more quiet.

Bob

On Feb 29, 2012, at 6:54 PM, Pete Lancashire
<pete@...> wrote:

> another DDS to consider is the AD9851, same boards just a few $'s more
> 
> -pete
> 
> On Wed, Feb 29, 2012 at 3:52 PM,  <SAIDJACK@...> wrote:
>> All the chip vendors sell parts in China in quantity for about 30% to 50%
>> less than quantity pricing in the US.
>> 
>> When asking distributors in China how this is possible they say "we Chinese
>>  expect this pricing, otherwise we wouldn't use these parts"
>> 
>> This is why it's so hard to compete with products from China...
>> 
>> That's also why new DVD players (with red laser diodes etc etc inside) can
>> be sold for $29 retail profitably.
>> 
>> bye,
>> Said
>> 
>> 
>> In a message dated 2/29/2012 13:45:10 Pacific Standard Time,
(Continue reading)

Jim Lux | 1 Mar 03:12 2012
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Re: AD9850 boards

On 2/29/12 4:20 PM, Bob Camp wrote:
> Hi
>
> They look like part of an eval kit.  The docs on the kit might be out there.
>
> Bob
>
>

Like this
http://www.analog.com/en/content/CU_AD9850_evaluation_tools/fca.html

The part has been around a while
"    * AD9850 Evaluation Board Software for Windows 3.1
       (zip, 143,708 bytes)

"

*

     * AD9850 and AD9851 Evaluation Software Source Code
       (zip, 208,643 bytes)

However I don't see the eval board listed...  The AD9850 is about $15 each

Could be that they dumped all the eval boards...that's probably getting 
to be a 15-20 year old part. (although I think we actually used them on 
some spacecraft radar as a chirp generator.. the partnumber is 
familiar.. maybe SRTM?)

(Continue reading)

Peter Gottlieb | 1 Mar 04:00 2012
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Re: AD9850 boards

Sourcing parts in China is very different from the US or Europe.  When I buy 
parts in the US I will first go to the distributor and get their price, then I 
will go to the manufacturer and get promised a better price, still through the 
distributor.  The distributor still gets a cut, even if the parts come direct 
from the factory.  In China, the distributor can be completely cut out (or take 
a much smaller cut) and the pricing blows away anything I can get here.  Same 
parts, same factory, certified parts, and sometimes even shipped right from the 
factory.  So in a way China is killing us on manufacturing because US 
manufacturers are giving the Chinese companies a strong price advantage.

On 2/29/2012 6:52 PM, SAIDJACK@... wrote:
> All the chip vendors sell parts in China in quantity for about 30% to 50%
> less than quantity pricing in the US.
>
> When asking distributors in China how this is possible they say "we Chinese
>   expect this pricing, otherwise we wouldn't use these parts"
>
> This is why it's so hard to compete with products from China...
>
> That's also why new DVD players (with red laser diodes etc etc inside) can
> be sold for $29 retail profitably.
>
> bye,
> Said
>
>
> In a message dated 2/29/2012 13:45:10 Pacific Standard Time,
> djl@... writes:
>
> Dunno if  you have seen this on ebay:
(Continue reading)

Don Latham | 1 Mar 04:23 2012

Re: AD9850 boards

No kidding! My complaint for some years now is that chips and such are
sold the same way as 19th century rubber goods...reps, jobbers,
distributors, wholesalers, uncle TOM cobleigh and all...
AnalogD does have a web store!
Don

Peter Gottlieb
> Sourcing parts in China is very different from the US or Europe.  When I
> buy
> parts in the US I will first go to the distributor and get their price,
> then I
> will go to the manufacturer and get promised a better price, still
> through the
> distributor.  The distributor still gets a cut, even if the parts come
> direct
> from the factory.  In China, the distributor can be completely cut out
> (or take
> a much smaller cut) and the pricing blows away anything I can get here.
> Same
> parts, same factory, certified parts, and sometimes even shipped right
> from the
> factory.  So in a way China is killing us on manufacturing because US
> manufacturers are giving the Chinese companies a strong price advantage.
>
>
> On 2/29/2012 6:52 PM, SAIDJACK@... wrote:
>> All the chip vendors sell parts in China in quantity for about 30% to
>> 50%
>> less than quantity pricing in the US.
>>
(Continue reading)

Burt I. Weiner | 1 Mar 16:48 2012
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Picon

More LightSquared...

Gang, FYI:

LIGHTSQUARED TECHNICAL WORKING GROUP REPORT.   Granted in part 
Lightsquare's Motion for Extension of Time.  Extended the time for 
filing comments in response to the Public Notice. (Dkt No.  11-109 ). 
Action by:  Chief, International Bureau. Comments Due:  03/16/2012. 
Reply Comments Due:  03/30/2012. Adopted:  02/29/2012 by ORDER. (DA 
No. 
12-320).  IB  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-12-320A1.doc
http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-12-320A1.pdf
http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-12-320A1.txt

Burt, K6OQK

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California  U.S.A.
biwa@...
www.biwa.cc
K6OQK 

Brooke Clarke | 1 Mar 17:41 2012
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Heathkit GC-1000 WWVDO

Hi:

Has anyone done stability plots on the Heathkit GC-1000?  Although it's a clock good to 0.1 seconds, it's
also a WWV 
disciplined oscillator (WWVDO).
The linear power supply makes use of a 7805 and so heats up the enclosure which is hard on the electrolytic
caps but 
also acts as a crystal heater.
On the other hand installing a switching power supply like the PT5101 will cool the enclosure but may
degrade the 
stability of the oscillator.

Are there any WWVB disciplined oscillators (WWVBDO)?

http://www.prc68.com/I/HeathkitGC1000.shtml
http://www.prc68.com/I/Loop.shtml

--

-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Brooke4Congress.html

Bob Camp | 1 Mar 18:30 2012
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Re: Heathkit GC-1000 WWVDO

Hi

Spectracom used to be in the WWVB / OCXO combo business. They had a few that
likely fit the modern definition of disciplined. I don't think anybody ever
did a WWV disciplined unit. The path delay issues are just to crazy.

Back when they were new, NBS / NIST was not very happy about the accuracy
that Heathkit advertised for the WWV receivers. I don't think the design had
a problem as much as the marketing sheets.

Bob

-----Original Message-----
From: time-nuts-bounces@...
[mailto:time-nuts-bounces@...] On
Behalf Of Brooke Clarke
Sent: Thursday, March 01, 2012 11:41 AM
To: time-nuts@...
Subject: [time-nuts] Heathkit GC-1000 WWVDO

Hi:

Has anyone done stability plots on the Heathkit GC-1000?  Although it's a
clock good to 0.1 seconds, it's also a WWV 
disciplined oscillator (WWVDO).
The linear power supply makes use of a 7805 and so heats up the enclosure
which is hard on the electrolytic caps but 
also acts as a crystal heater.
On the other hand installing a switching power supply like the PT5101 will
cool the enclosure but may degrade the 
(Continue reading)

Bob Camp | 1 Mar 18:36 2012
Picon

Re: AD9850 boards

Hi

The basic issue is that below a certain dollar volume you go from being a
factory direct account to being a distributor account. There is a little
wiggle room in most contracts about the point that happens, but not a whole
lot. Most of us simply do not do the millions of dollars / year volumes (per
supplier) that get you into the factory direct category. 

Yes indeed this does apply directly to the AD9850. At one point we more or
less tripped over the magic boundary with the AD9854 and set off some alarm
bells at Analog Devices. The project died soon after that ...

Bob

-----Original Message-----
From: time-nuts-bounces@...
[mailto:time-nuts-bounces@...] On
Behalf Of Peter Gottlieb
Sent: Wednesday, February 29, 2012 10:01 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] AD9850 boards

Sourcing parts in China is very different from the US or Europe.  When I buy

parts in the US I will first go to the distributor and get their price, then
I 
will go to the manufacturer and get promised a better price, still through
the 
distributor.  The distributor still gets a cut, even if the parts come
direct 
(Continue reading)


Gmane