Re: [time-nuts] Symmetricom ET-6000 TCXO receivers

[Robert Watzlavick]

Erik,
I upgraded my ET-6000 TCXO receiver to an OCXO.  I was able to get 
Symmetricom to send me all three ROM images (TCXO, OCXO, Rubidium) so I 
uploaded them to the KO4BB website:


http://www.ko4bb.com/getsimple/index.php?id=manuals=01_ROM_Images_and_Drivers
Get the file called DatumET-6000TS-2100.zip

You'll need the DT102E (OCXO) firmware.  See my posts on 8/25/2012 and 
8/26/2012 for more details.  I would have liked to use an MV-89 that I 
had but it was too big so I used a small Raltron OCXO I had available at 
the time.  It dramatically improved the output stability.  For the OCXO, 
you can power it from either 5V or 12V (both are available on board) but 
the EFC range is 0-5V (I think the range of the DAC is 0.5 to 4.5V).


-Bob

On 04/17/2016 03:04 PM, Erik Thomassen via time-nuts wrote:

  Good evening  group !
I am in the fortunate situation to have "inherited" two Symmetricom ET6000-TCXO 
receivers. Seemingly  fine receivers but i do not like the way they "drift" plus /minus. 
They never seem to settle, even free-running OCXO's seems to be far better over short time.
  Yes, I know that this is the rule - but when compared with a new Meinberg GPSDO unit 
(replacing the ET6000) the -6000 "never" settles.

I am in the firm beleif that a change from a cheap TCXO to a "reasonable" OCXO 
of any make will at least stabilize the 10MHz output by a decade or more.

  I do have the user manual but: I do not feel confortable exhanging the 
original TCXO with a OCXO of any higher accuracy/stability, non original 
component just like that...

Any suggestions for making a reasonably good receiver even better by simple and 
cheap means? Any service manual/info deeper than the user manual?
Kind regards from NorwayErik
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Re: [time-nuts] Symmetricom ET-6000 TCXO receivers

[Bob Camp]

Hi

You are correct in your observation that the short term stability of a TCXO 
*does* impact GPSDO performance.  An OCXO 
(once it has warmed up and stabilized) will do better than a TCXO.

Because of the higher sensitivity of a TCXO on the EFC, there will be some 
change to the firmware when going from a TCXO
to an OCXO. Can you get things done? Maybe….

There are a number of OCXO GPSDO’s out there these days. The “low cost” ones 
seem to be in the ~$40 range. It’s cheaper 
to get one of them than to do crazy things to a TCXO based unit. 

Bob

> On Apr 17, 2016, at 4:04 PM, Erik Thomassen via time-nuts 
>  wrote:
> 
> Good evening  group !
> I am in the fortunate situation to have "inherited" two Symmetricom 
> ET6000-TCXO receivers. Seemingly  fine receivers but i do not like the way 
> they "drift" plus /minus. They never seem to settle, even free-running OCXO's 
> seems to be far better over short time. 
> Yes, I know that this is the rule - but when compared with a new Meinberg 
> GPSDO unit (replacing the ET6000) the -6000 "never" settles.
> 
> I am in the firm beleif that a change from a cheap TCXO to a "reasonable" 
> OCXO of any make will at least stabilize the 10MHz output by a decade or more.
> 
> I do have the user manual but: I do not feel confortable exhanging the 
> original TCXO with a OCXO of any higher accuracy/stability, non original 
> component just like that... 
> 
> Any suggestions for making a reasonably good receiver even better by simple 
> and cheap means? Any service manual/info deeper than the user manual?
> Kind regards from NorwayErik
> ___
> 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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[time-nuts] Symmetricom ET-6000 TCXO receivers

[Erik Thomassen via time-nuts]

 Good evening  group !
I am in the fortunate situation to have "inherited" two Symmetricom ET6000-TCXO 
receivers. Seemingly  fine receivers but i do not like the way they "drift" 
plus /minus. They never seem to settle, even free-running OCXO's seems to be 
far better over short time. 
 Yes, I know that this is the rule - but when compared with a new Meinberg 
GPSDO unit (replacing the ET6000) the -6000 "never" settles.

I am in the firm beleif that a change from a cheap TCXO to a "reasonable" OCXO 
of any make will at least stabilize the 10MHz output by a decade or more.

 I do have the user manual but: I do not feel confortable exhanging the 
original TCXO with a OCXO of any higher accuracy/stability, non original 
component just like that... 

Any suggestions for making a reasonably good receiver even better by simple and 
cheap means? Any service manual/info deeper than the user manual?
Kind regards from NorwayErik
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