[time-nuts] Ventilation of HP 58503A GPS time & frequency reference receiver

Bob Camp kb8tq at n1k.org
Sun Dec 14 15:09:15 EST 2014


The desktop version (with handle) used the rubber “bumper” wrap around for feet. The bumpers got pulled when they were rack mounted. The ones that got put back on may or may not be identical to the originals. That’s a very normal part of the surplus process. The 100% correct HP original case on the box as HP built it did not use the clip on feet. 

The reason for this is pretty simple. The Z3801 / Z3805 came before the “instrument” versions of the same products. The internal case structure is same/ same. The instrument simply gets a gray sheet metal jacket that fits around the Z38xx box. That’s the way HP designed it. Since its just a jacket, it gets feet as part of the bumpers. Most of these (likely 99%) got rack mounted and the feet / bumpers were tossed. I have a *lot* of very legit surplus HP gear that did not come with feet or bumpers. 


> On Dec 14, 2014, at 2:46 PM, Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby at kirkbymicrowave.co.uk> wrote:
> On 14 December 2014 at 19:32, Bob Camp <kb8tq at n1k.org> wrote:
>>> There are not the usual 3 holes underneath where feet go.
>> I understand that they are different. The problem is the same though. Pulling a box in and out of a rack with feet or bumpers on it is a pain. They often get “lost” early in the instrument’s life. Often it’s a standard process on all gear as it comes into the facility.  All of the un-needed bits and pieces go into a big pile. When the feet (or whatever) are found later in life they may or may not be re-installed correctly. They might not even be the ones that came with the instrument.
>> Bob
> I am not sure if you are following me. On most (all??) HP kit I have
> seen, there are 3 holes at each corner of the bottom, where is
> possible to fit feet if one is going to use it on a desktop, rather
> than a rack. This unit does not have those holes, so it would be
> impossible to fit the usual HP feet on it.
> Looking around, I have 15 bits of HP kit,  all of which have holes in
> the corner for feet. But this 58503A, with the Chinese box, does not
> have the holes. I don't know whether the 85053A is supposed to have
> them, or whether this is just a flaw in the design of the counterfeit.
> Dave
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