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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