It’s big. It’s highly efficient, for a tube rig. It can do analog and HD. It runs the damn lowest stack temperature I’ve ever seen. It’s full of Linux. It has… a curiously labelled hidden pushbutton I’m amused and scared of. It confused so many other engineers they called me in to shape it up! It’s… the Harris Broadcast HPX! (GatesAir branded, nowadays.)
And it inspired me to invent…. ｔｒａｎｓｍｉｔｔｅｒｗａｖｅ
This post is very image heavy so I’ll split it to avoid an endless front page on my blog.
Remember when the following tag was <lj-cut text=”Read more…”>? Pepperidge Farm remembers.
These boxes are everywhere around here because certain equipment that needs to be stationed outdoors isn’t happy with the 96 degree F summer outdoor temperatures. They’re an outdoor weather resistant enclosure, with an air conditioning unit attached through one side.
Air conditioning units have two functions. They reduce temperature and humidity. The amount of humidity they remove is proportional to the amount of time the unit is in cooling mode.
This cabinet is very well insulated and has a very low heat load… Watch this Nautel loooooaf along…
Standing next to it, I saw that little a/c pack start maybe once every 10 minutes, for about a minute at a time.
Brace yourself, the results ain’t pretty.
This curious white fungus is attacking rubber parts…
Various points of moisture or fungus damage…
And as an added bonus, open this cabinet on a hot humid day and you’ll be treated to the horrific sight of the equipment becoming soaking wet while still actively running…
Insects have been attracted to the cabinet by moisture… This is after a big vacuuming, the junk stuck to the cabinet ain’t gonna yield to that alone…
So what’s the solution? I can think of a couple things.
A) do not oversize the air conditioner. This is tricky as heat load is unpredictable and failure to remove enough heat would quickly cause a shutdown or equipment damage.
B) place constantly on LED lights inside to inhibit this mold/fungus growth.
C) use humidity controls on the a/c or a dehumidifier if possible. Not sure if you could easily fit a humidistat to this unit as it’s got its own integrated microprocessor control (hidden behind that piece of filter)… But who knows.
Ahhh, long time clueless pirate Blaze FM is back on 88.7 and causing problems for listeners of WDNA at 88.9.
Let me just hook up the Arizona tea can to the analyzer here….
This is them sending dead carrier. Note WDNA signal over to the right fully modulated. Horizontal is 50 kilocycles/division
Setting the analyzer to peak hold is useless as it just fills up with spurs from who the hell knows what, but here, enjoy this indistinct lump with the interior of the dead 777 International Mall in downtown Miami.
This little turd blossom!!! Its blower relay inexplicably turned its cooling fan off while I was using it to shitcan 23,500 watts of RF power!!!
Looks like I’ve got some interlock logic to fix up! This should have opened an interlock upon the load’s air vane switch dropping and caused the transmitter to drop back to plate off. You know, instead of me hearing its blower stop from in the restroom and having to go running to prevent the meltdown. XD
That moment when you hit seek on your car radio, and it stops on a channel that should be vacant with a dead carrier with a strange warbling beep every second, followed by a voice screaming “¡DISFRUTA!” and then the carrier drops without a trace