[time-nuts] re ET-6000 firmware

Robert Watzlavick rocket at watzlavick.com
Mon Aug 27 02:08:03 UTC 2012

The manual I have isn't too clear on the differences between the units 
but the drawing shows an LPRO tucked into the left front of the unit 
with 2 coax cables going to the PC board (EFC, OSC), and one going to an 
additional power supply in the right rear.  The ET-6000 DAC is 0-5V 
(actually 0.5-4.5 I think) so the LPRO will probably work without any 
adjustments other than the new firmware which contains the appropriate 
gain and filter constants.

I believe all you need to do is:
Remove the TCXO (or cut the trace from the output)
Connect the 10 MHz from the LPRO to J3 (OSC in)
Install a suitable resistor at position R96 (it shows "51 1" - 51 ohm, 1 
Connect J2 (DAC out) to the LPRO
Install an appropriate power supply for the LPRO

Somebody mentioned a while back that the units with the LPRO in them ran 
very hot.


On 08/26/2012 02:05 PM, Joe Leikhim wrote:
> Bob;
> I have a TCXO version and wonder apart from the ROM change, what 
> recommended hardware is required to install a rubidium osc? Is there a 
> parts list somewhere? I would prefer not to cobble up if I can help it.
>    --------
>    I finally got a flash programmer so I uploaded all three ROM images
>    (TCXO, OCXO, Rub) for the Datum ET-6000 / 9390-6000 to the KO4BB
>    website.  Last year I sent them 3 chips and asked for all the variants
>    so I could play with converting my TCXO unit to an OCXO unit (and
>    potentially a Rubidium some day).  I think the images are in the 
> upload
>    folder awaiting their final home.
>    This latest firmware addresses the GPS date problem.
>    DT101E = TCXO
>    DT102E = OCXO
>    DT103E = Rubidium
>    Some guy is selling DT101E chips on eBay for $50 (sorry if you're 
> on the
>    list...)
>    -Bob

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