I should have paid more attention in chem classes. This goes down as my "learned something today" factoid.
On 11/16/07, CHUCK PROFITO <[EMAIL PROTECTED]> wrote: > Almost ALL metal absorbs water! As soon as you put a torch on it or weld on > it, you see it dry if front of your eyes. > Cast steel and cast aluminum hold way more than rolled, and hardened even > less... The denser the material, the less it absorbs. So don't take this > wrong, but if its 'soft' it sucks. > > Chuck Profito > 209-988-7388 > CV-ACCESS, INC > [EMAIL PROTECTED] > Providing High Speed Broadband > to Rural Central California > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Jeromie Reeves > Sent: Friday, November 16, 2007 4:53 PM > To: WISPA General List > Subject: Re: [WISPA] WR 900 question > > > Ehh I do not know about through it self. I do know that small spaces can > will "suck" air (and water vapor with it) in as they do the heat/cool cycles > due to pressure changes. This can be seen by leaving a kids sealed plastic > toy out side for a few weeks. If you wish to test it you first have to > submerge the toy for 24~48 hours in water to make sure its water tight, use > cold water and pre-chill the toy in the fridge. > > I am curious about how well the cavity filter worked after a CLR treatment. > CLR and most other such cleaners for calcium, lime, or rust are based on > hydrochloric acid and do a fair job of eating metal. I found out the hard > way that it can and will eat a tub drain clean through if left over night. > Was the part washed and rinsed with distilled water after the cleaning? > > > On 11/16/07, Dave Hulsebus <[EMAIL PROTECTED]> wrote: > > Chris, We had a similar situation this week and found that our cavity > > filter was the cause of our problem. I have a number of the 2.5db loss > > filters from WR we got five years ago. None have ever been mounted > > outdoors. When we opened it up we found calcium deposits in the copper > > tuning tubes. We user CLR to clean them and re-inserted in the filters > > - problem gone. I had a newer .5db loss filter in an attic of one of > > our buildings this past summer, gets up to 150F in the attic. That > > filter also had calcium inside. One day all the clients started > > dropping off line. That one didn't appear as noise, but as signal > > loss. An old machine shop guy told me that aluminum would draw > > moisture into it over time. Having been a physicist 30 years ago, I'm > > not sure I believe what he said but he's been around for 50 years > > doing metal work. Anyone else have a thought on aluminum drawing > > moisture through itself into the filter. > > > > Dave Hulsebus > > Portative Technologies > > > > chris cooper wrote: > > > We have a WR 900 MHz cell that saw a sudden 10 db jump in noise. > > > Running spec ans from other towers doesn't show this rise in noise > > > in the same band. Doing sweeps from the tower using another device, > > > albeit 600' lower than the affected ap, we still don't see the noise > > > floor rise, even when we run a scan pointed straight at the ap. I > > > know we cant exactly mirror conditions at the ap from a lower > > > altitude, but shouldn't we see some of the noise that it is > > > reporting? Im wondering if we have a bad piece of gear up there... > > > CPE units seem to be receiving signal as normal, but ap side is > > > having trouble hearing them. Could wet connectors cause behavior - > > > we had torrential rain followed by high heat. > > > > > > Thanks > > > Chris > > > > > > -------------------------------------------------------------------- > > > ------------ > > > > > > ** Join us at the WISPA Reception at 6:30 PM on October the 16th 2007 at > ISPCON ** > > > ** ISPCON Fall 2007 - October 16-18 - San Jose, CA www.ispcon.com ** > > > ** THE INTERNET INDUSTRY EVENT ** > > > ** FREE Exhibits and Events Pass available til August 31 ** > > > ** Use Customer Code WSEMF7 when you register online at > > > http://www.ispcon.com/register.php ** > > > > > > -------------------------------------------------------------------- > > > ------------ > > > WISPA Wants You! 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