[time-nuts] re ET-6000 firmware

Tom Knox actast at hotmail.com
Sun Aug 26 23:28:23 EDT 2012


Hi;
I may have a LPRO unit, if so I will post pictures.
Best Wishes;

Thomas Knox



> Date: Sun, 26 Aug 2012 21:08:03 -0500
> From: rocket at watzlavick.com
> To: jleikhim at leikhim.com; time-nuts at febo.com
> Subject: Re: [time-nuts] re  ET-6000 firmware
> 
> 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 
> watt?)
> 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.
> 
> -Bob
> 
> 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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