[time-nuts] how to open a Trimble mushroom ?

paul swed paulswedb at gmail.com
Sat Dec 25 17:22:05 UTC 2010


Seem to recall they may be rs422.

On Sat, Dec 25, 2010 at 10:37 AM, Pete Lancashire
<pete at petelancashire.com>wrote:

> I knew I was not the first :-) !
>
> I was willing to sacrifice this one since it was marked intermittent
> and I have a total of five. Three of the other four
> are still in sealed bags.
>
> As to powering up, I've not yet located any of the cables. I do have
> foggy memories of there being some at least
> 50' maybe 100'.
>
> Their GPS need was only 1 PPS, why the special I don't know.
>
> Thanks !
>
> -pete
>
> On Sat, Dec 25, 2010 at 2:08 AM, Robert Atkinson <robert8rpi at yahoo.co.uk>
> wrote:
> > Hi Pete,
> > That is the same case as the Palisade. I've opened one before. It looks
> like it should unclip but does not. The two halves do clip together, but
> there is a "gutter" inside the circumference of the lower half that a molded
> edge of the top fits into. They fill the gutter with epoxy before clipping
> them together. I had to cut through the top to open it. It had a curved
> crossed dipole antenna and a GPS RX on a PCB. All highly inegrated. Have you
> tried powering it up using the Palisade / accutime connection info and
> montitoring the data pins?
> >
> > Happy Holidays,
> > Robert G8RPI.
> >
> > --- On Fri, 24/12/10, Pete Lancashire <pete at petelancashire.com> wrote:
> >
> >
> > From: Pete Lancashire <pete at petelancashire.com>
> > Subject: [time-nuts] how to open a Trimble mushroom ?
> > To: "Discussion of precise time and frequency measurement" <
> time-nuts at febo.com>
> > Date: Friday, 24 December, 2010, 22:00
> >
> >
> > More goodies from storage
> >
> > I have a few 'special' Trimble mushroom GPS's. I'm trying to open one up
> > but can't seem to get very far. I've pulled all the tabs out but still
> can't pry
> > the case open.
> >
> > They interface between the two sections doesn't look welded or glued.
> >
> > Here a couple picts
> >
> > http://petelancashire.com/gallery/main.php?g2_itemId=21208
> >
> > The data on these guys was trashed long ago when the company closed
> > up. I could not locate it anywhere.
> >
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> >
> >
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