[Milsurplus] AN/URM-32A

[Bob Camp]

Hi

I agree totally about the value of a shop compressor. It has saved me a 
number of times. Air powered tools often are available surplus for next 
to nothing and they work very well.

Last time I did anything with dry air it ran through a setup that got 
the dew point down to around -60 C or below. The setup was designed to 
pressurize wave guide with. We could have done the same thing with 
nitrogen but we needed a couple of hundred cubic feet per minute at a 
couple hundred pounds pressure. Even with a nitrogen tank that's a lot 
of gas. I have neither a liquid nitrogen tank or a dryer cartridge 
setup here at home ....

Since the URM-32 was deployed to an enormous number of locations I 
wonder how many of them could do the dry air thing. How big a ship does 
it have to be in order to have a dry air (like -55 C dew point) setup? 
I'm sure the big stuff like carriers probably has one of every device 
known to man on board, but I'm not so sure about the smaller ships ... 
I also suspect that the smaller ships were more likely to depend on 
something like a URM 32 rather than something more sophisticated like 
an frequency standard and a counter.

Any thoughts from those who where there and did that ?

	Enjoy!

		Bob Camp
		KB8TQ





On Jul 24, 2004, at 10:47 AM, Bruce Lane wrote:

> Hi, Bob & group,
>
> *********** REPLY SEPARATOR  ***********
>
> On 24-Jul-04 at 09:28 Bob Camp wrote:
>
>> Hi
>>
>> The interesting thing is the URM-32 has a fitting that looks a lot 
>> like
>> a tire stem mounted on the chassis. I assume it is either to 
>> pressurize
>> the sealed chassis or to dry it out. Pressurized dry air seems to be 
>> an
>> unusual thing to have around the shop. Definitely need to take a look
>> at a manual.
>
> 	Not unusual at all, actually. A source of clean, filtered/dried and 
> compressed air is incredibly useful for a variety of things. This is 
> why I invested in a compressor a couple of years ago, and did some 
> flexible tubing in the garage in a semi-permanent installation.
>
> 	Some of the things I've done with it include operating pneumatic 
> contact-crimping tools (it came in VERY handy when I was building a 
> pair of 40-contact cables), blowing gunk out of equipment, and 
> inflating hand truck tires.
>
> 	As for the '32: My understanding is that electronic equipment starts 
> to act a little weird if it's operated above a given altitude. I've 
> not learned why just yet, but those valves were indeed present to 
> pressurize the chassis to a much lower relative altitude.
>
> 	Keep the peace(es).
>
>
>>
>> I suspect that it's been thirty years since this box saw a real depot
>> so it's not to surprising that the dry chassis has leaked a bit.
>>
>> 	Thanks!
>>
>> 		Bob Camp
>> 		KB8TQ
>>
>>
>>
>> On Jul 23, 2004, at 11:34 PM, Kenneth G. Gordon wrote:
>>
>>> Bob Camp wrote:
>>>
>>>> Third question - There is a magic part of the chassis labeled
>>>> "Dehydrated compartment do not unseal". It also has a cute little 
>>>> pink
>>>> capsule in a glass tube. Is pink good or is pink bad in terms of a
>>>> humidity indicator?
>>>
>>> Bad. Blue indicates dry. Pink indicates "wet". You can dry the
>>> dessicant
>>> out in an oven, however.
>>>
>>> Ken W7EKB
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>
> -=-=-=-=-=-=-=-=-=-=-=-
> Bruce Lane, Owner & Head Hardware Heavy,
> Blue Feather Technologies -- http://www.bluefeathertech.com
> kyrrin (at) bluefeathertech do/t c=o=m
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> with surreal ports?"
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