[time-nuts] Z38xx rack mounts
GandalfG8 at aol.com
GandalfG8 at aol.com
Thu Oct 23 06:02:15 EDT 2014
Hi Mike,
Many thanks for the information, but as I understood it the question was
asked with regards to the Z38xx Telecom styled units and not those variants
such as the HP58503 series that were indeed built into HP desktop cases as
you describe.
The HP Z3801A etc and similar units from other manufacturers, Trimble for
example, meet the Nortel GPSR specification, a copy of which is available
for download at Didier's web site, and do not have the physical frame
structure that would accept the HP link lock kit.
However, the box itself of the Z3801A unit, although in this case just a
bare aluminium enclosure, is very similar in size to the body of HP's normal
half rack test gear, it's really the front panel on the Z3801A that flings
a spanner into the works, so for anyone prepared to remove or modify that
panel the rack mounting "problem" becomes much less of an issue.
On the question of similarities in size between the Z3801A chassis and a
standard HP 1/2 rack unit, there seems to have been a number of 58503A
desktop units offered for sale, generally from China but not always, that the
supplier claims to have been "upgraded" from a Z3801A, or sometimes a Z3805A.
These units do have the rubber bumpers fitted, and what looks like an HP
desktop style panel, but generally seem to retain the usual Z3801A aluminium
enclosure so I imagine the bumpers would just be a push fit over that.
One current Ebay offering clearly shows the internals as looking very much
like a standard Z3801A but makes the claim "Z3801A has been upgraded by
us, which the feature is the same as 58503A".
A screenshot of SatStat also shows the unit identifying as 58503A but aside
from the cosmetics I've never seen any clear indication of what's actually
claimed for this "upgrade".
Are there any significant performance differences between a Z3801A and a
58503A, and was any actual HP or Symmetricom firmware ever available to make
such an "upgrade", or is this more likely to be purely a cosmetic exercise
with someone hacking the standard Z3801A software so it now identifies as
a 58503A, or perhaps something somewhere in between?
Regards
Nigel
GM8PZR
In a message dated 23/10/2014 02:52:29 GMT Daylight Time,
mblazer at satx.rr.com writes:
Nigel,
These are standard HP 1/2 rack units. The rubber bezel around the
front and back peel off. HP (Agilent, now Keysight) makes a Link Lock
Kit
<http://www.ebay.com/itm/HP-Agilent-Lock-Link-Kit-5061-5458-/291271152251?pt
=LH_DefaultDomain_0&hash=item43d11d127b>
to connect the units. The finger piece mount in the slots in the side of
the front bezel and lock together. The lock pieces strap the rear square
frame posts together. Add the 2U (each 'U' is 1-3/4") rack mount
flanges and you're good to go.
Mike
On 10/22/2014 4:26 PM, GandalfG8--- via time-nuts wrote:
> Hi Dave
>
> Many thanks for the MTI260 data, that's very useful and much
appreciated.
>
> As regards the the Z38xx modules, my Z3801As actually measure 10 9/16
> between the front panel edges but obviously still too much to fit two
like that
> into a standard 19 inch rack.
>
> I've considered two options on this, one is to keep the existing front
> panel and just cut it down closer to the case itself and the other,
prompted by
> having one arrive several years ago with a bent front anyway, is just
to
> remove the existing front panels entirely and make up another panel to
> accommodate two units side by side.
> The actual cases themselves are 8 inches wide so two should sit side by
> side quite nicely in a 19inch rack.
>
> Regards
>
> Nigel
> GM8PZR
>
>
> In a message dated 22/10/2014 21:44:42 GMT Daylight Time,
> dgminala at mediacombb.net writes:
>
> I have a couple questions regarding the Z38xx type units. I have a
> Z3801A,
> and a couple other modules that don't need a full 19" rack space. The
> Z38xx
> units are 11" wide (10-9/16" mounting centers) , and obviously are not
> suitable for a standard 19" rack cabinet.
>
> Looking in the Z3801A manual, I see that the rack trays that these units
> are
> mounted in are 28.5" wide, with a dual mounting shelf so that two GPS
> units
> can be mounted side-by-side. Were the racks for these units custom
built
> by
> Motorola and/or Symmetricom? Where in the civilized world might these
> cabinets and mounting shelves be found and purchased (preferably
surplus)?
> I've searched Google until my eyes are crossed, but nothing shows up.
> Maybe
> I'm not using the right search terms? Don't know.
>
> I guess I could destroy an old rack cabinet and fabricate something that
> would fit the equipment, but I'd prefer to buy one (assuming that it
> doesn't
> approximate the cost of a new SUV).
>
> Cheers,
> Dave M
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