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

Bob Camp kb8tq at n1k.org
Sun Dec 14 20:26:47 EST 2014


Hi

> On Dec 14, 2014, at 8:05 PM, Pete Lancashire <pete at petelancashire.com> wrote:
> 
> And 'scope probes :-)

Ok, that’s just plain not fair. I could accept the motherland of bumpers and handles. Tossing in scope probes … you are not to expect the usual fruit basket from me at Christmas :)

Bob

> On Dec 14, 2014 12:59 PM, "Bob Camp" <kb8tq at n1k.org> wrote:
> 
>> Hi
>> 
>> 
>>> On Dec 14, 2014, at 3:50 PM, Scott McGrath <scmcgrath at gmail.com> wrote:
>>> 
>>> Much of the Malaysian Agilent gear uses this style of case with a
>> wraparound bumper in place of the system II feet and feet are removed when
>> gear is rack mounted.
>>> 
>>> One of my best surplus buys ever was a huge crate of mixed mounting
>> hardware feet / rack flanges etc I've been using that box o stuff for 10
>> years
>> 
>> Somewhere there’s a building full of gear all of which is missing it’s
>> feet and bumpers …
>> 
>> You are lucky to have found that box. In most cases they get tossed out
>> with the trash. The same is true of many of the fancy i/o cables, they get
>> put into the copper recycle pile and are gone…
>> 
>> Bob
>> 
>>> 
>>> Content by Scott
>>> Typos by Siri
>>> 
>>>> On Dec 14, 2014, at 3:09 PM, Bob Camp <kb8tq at n1k.org> wrote:
>>>> 
>>>> Hi
>>>> 
>>>> 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.
>>>> 
>>>> Bob
>>>> 
>>>>> 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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