[time-nuts] Use the LT3042 for retrofit?

[Perry Sandeen via time-nuts]

Yo Dudes,
Should one consider retrofitting  HP 105's,  Austron 1250's or HP 10811 power 
supplies with the LT3042 for better performance?  The price is modest.  The HP 
10811 suggested PS for the EFC is a 723 circuit that spedc's 6 microvolts 
ripple IIRC.
Regards,
Perrier
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Re: [time-nuts] Qualcomm 1152 Synthesizer Boards

[Mike Seguin]

Not really "Time Nuts" related, but feed these 10 MHz and they make an 
excellent marker system for 2304, 3456, 5760, 10,368 and 24,192.


(yes they have harmonics up to 24 GHz)
---
73,
Mike, N1JEZ
"A closed mouth gathers no feet"

On 2018-03-20 12:26, Richard Solomon wrote:
In rooting through my stash, I found a couple of these boards that I 
picked up


some years ago.


Are they of any use these days or has technology made them obsolete ?


Thanks, Dick, W1KSZ


Sent from Outlook
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Re: [time-nuts] Qualcomm 1152 Synthesizer Boards

[ew via time-nuts]

Richard
 is that the BCDl   DDS sounds familiar, if so there  are Cs out there that 
need them and can not be found.
Bert
 
In a message dated 3/20/2018 2:08:39 PM Eastern Standard Time, 
w1...@outlook.com writes:

 
 In rooting through my stash, I found a couple of these boards that I picked up

some years ago.


Are they of any use these days or has technology made them obsolete ?


Thanks, Dick, W1KSZ


Sent from Outlook
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Re: [time-nuts] Looking for information on True Position GPSDO.

[John Green]

Mark,
Yes, I saw that. My main interest at the moment is just getting the thing
working properly. It isn't.

On Tue, Mar 20, 2018 at 11:39 AM, Mark Sims  wrote:

> When I dumped the flash rom from one of the TruePosition units, we found a
> couple of commands that seem related to OCXO learning.   They are discussed
> a little in the thread on EEVBLOG.
>
> 
>
> > If you *do* go swapping around OCXO’s (or whatever) on a GPSDO board,
> it’s very nice to be able to change the internal “magic numbers” to get the
> control loop running properly again.
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[time-nuts] Looking for information on True Position GPSDO.

[Mark Sims]

When I dumped the flash rom from one of the TruePosition units, we found a 
couple of commands that seem related to OCXO learning.   They are discussed a 
little in the thread on EEVBLOG.



> If you *do* go swapping around OCXO’s (or whatever) on a GPSDO board, 
it’s very nice to be able to change the internal “magic numbers” to get the 
control loop running properly again. 
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[time-nuts] Qualcomm 1152 Synthesizer Boards

[Richard Solomon]

In rooting through my stash, I found a couple of these boards that I picked up

some years ago.


Are they of any use these days or has technology made them obsolete ?


Thanks, Dick, W1KSZ


Sent from Outlook
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Re: [time-nuts] Looking for information on True Position GPSDO.

[Bob kb8tq]

Hi

If you *do* go swapping around OCXO’s (or whatever) on a GPSDO board, 
it’s very nice to be able to change the internal “magic numbers” to get the 
control loop running properly again. The TBolt kind of spoiled us all in that 
regard. Most GPSDO’s are not very user friendly in this regard ( = you can’t
get at the numbers you need to change). 

Bob

> On Mar 19, 2018, at 1:01 PM, Gregory Beat  wrote:
> 
> John -
> 
> I would NOT bother with trying to replace the 10 MHz oscillator.
> 
> Spend your $$ for the inexpensive Arduino board, LCD, 5 volt antenna, and 
> nice enclosure  that will provide you with a “self-running” GPSDO unit 
> (operator intervention not required to operate).
> The fact that Mt. Airy has already provided the Arduino “firmware” (HEX) is a 
> BIG plus —  IF you have no coding experience.
> 
> In addition, you should change to Google for Internet searches, and routinely 
> post purchase queries to focus groups, like time-nuts, before blindly 
> purchasing on eBay.
> That is the “smart approach”, that saves time, $$ and get what you desire.
> 
> Greg, w9gb
> ===
> Date: Sun, 18 Mar 2018 09:59:08 -0500
> From: John Green 
> To: time-nuts@febo.com
> Subject: [time-nuts] Looking for information on True Position GPSDO.
> 
> This isn't a bad looking little board. 
> I was thinking of pulling the little CTS oscillator and replacing it with 
> something better.
> The fact that you have to tell it to do its thing is something of a bummer, 
> but I think I can live with it.
> 
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Re: [time-nuts] ULN regulator with more current capability than LT3042?

[Attila Kinali]

Hoi Gerhard,

On Sun, 18 Mar 2018 21:41:28 +0100
Gerhard Hoffmann  wrote:

> Use the LT3042 with an external power transistor, such as D44VH10G:
> 
> < 
> https://www.flickr.com/photos/137684711@N07/29197476530/in/album-72157662535945536/
>  
>  >
> 
> Performance is about the same as the LT3042 alone. That is exactly the 
> circuit from the data sheet

Have you measured it's dynamic performance?
I did some spice simulations some time ago and noticed that there are
some load conditions where this circuit is very close to oscillation
(ie load changes lead to heavy ringing)of course, this is under
the assumption that the spice model of the LT3042 is accurate in that
regard.

Attila Kinali

-- 
It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
 -- Miss Matheson, The Diamond Age, Neil Stephenson
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[time-nuts] There goes LORSTA Jan Mayen

[Poul-Henning Kamp]

http://jan.mayen.no/nyheter/destruksjon-av-loran-c-long-range-navigation/

-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
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Never attribute to malice what can adequately be explained by incompetence.
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