[time-nuts] re ET-6000 firmware
actast at hotmail.com
Sun Aug 26 23:28:23 EDT 2012
I may have a LPRO unit, if so I will post pictures.
> 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
> 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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