Nick and Jeff,
That 10-year-old hardware is a real bear! It's modern enough that it
*should* work and/or have repair parts available, but... no.
I'm currently working on a radio telescope antenna, an ALMA prototype
antenna, that was built in 2001-2003. It has an amazing number of
components that are unobtainium, including such items as the drive motor
controllers. Even the major components inside these controllers are
unobtainium. Grrr!
On 2/18/14 8:41 AM, Nick wrote:
On Tuesday, 18 February 2014 15:30:10 UTC, Greg P wrote:
Please post more pictures of the modifications, and especially the back
where the new GPS plugs in.
Beautiful clock, BTW.....Nice to see it "alive" again.
All the mods are Jeff's - the old OnCore unit, CR2032 holder & antennae
BNC were removed, the original BNC hole was reamed out to 13mm and an
in-line PS2 female connector mounted into the cavity (its a tight fit), the
space for the MAX232 was populated and the PS2 connector wired to that
(Vcc, GND, RXD, TXD) - a new Haicom HI-204III GPS puck plugs into that -
the anode resistors were changed to a slightly lower value, the current
limit on the HV SMPS was upped by 30%, the PIC was replaced with one with
new firmware, plus a few other minor electronic & cosmetic changes etc.
It now locks in under 30 seconds and is as stable as a rock.
Nick
--
David Forbes, Tucson AZ
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