Fixing the Space Station Toilet (Harris PowerCD)

A couple weeks ago I was at the tower making bad jokes about the liquid cooled EEV ESCIOT tube based Harris PowerCD transmitter being a space station toilet.

Really, it’s a three stall restroom, and today I got all three flushing again… and learned more about how freaking weird and scary *pure* deionized water can be.

First, here’s a questionable explanation of what’s in there. You’re looking at two separate liquid cooling loops. The external one which exits the cabinet at upper left circulates an ethylene glycol coolant solution (similar to automotive antifreeze, but nigh unobtainable outside of ordering it off Shamazon) between the heat sources and a set of fan cooled radiators outdoors. It’s circulated by an external pump station. I marked its flow with the orange arrow emojis. The internal one has a pump in the cabinet as it’s a closed loop within. The vertical accordion looking piece is a heat exchanger. Attached to the door on the left are two filters that keep the deionized (DI) water as pure as possible to keep its electrical resistivity high.

The supply manifold at the top sends the anode and collector water jacket water supplies to the tube cart around the front. The small line coming out the middle feeds the filters; you can set their flow rate with a valve up there. Everything finally returns to the pipe at the left that sends the DI water back to the reservoir on top. Now, have you noticed the middle finger emojis yet? Well.

Meet the Pinwheel of Despair.

In the DI water returns from the anode and collector are these Seametrics flow sensors. The pinwheel has magnets in two opposing vanes, and a Hall effect sensor screws into the recess seen at the bottom here. By measuring the interval between pulses, the transmitter controls can determine if there’s enough water flow… until the sensor breaks.

Now let me say this, I see absolutely nothing wrong with the design and build of the Seametrics sensor. It’s actually damn cool for what it is. No metal parts contact the working fluid, and it rides on a ceramic shaft and ruby bearings like a fine watch movement (and that wouldn’t even have ceramic shafts… Or would it?)

The Seametrics is even completely field rebuildable!

So, uh, time to be creeped out and amazed by mere water. In the picture of the cabinet you’ll see there’s one more sensor mounted horizontally in the glycol line. This never fails, as the glycol solution has some lubricity to it – that is to say it’s slick and forms a film that tends to isolate facing surfaces from direct contact, just like an oil would. The DI water, however…. No. When I got some on my hands, it felt really weird, almost more like I’d just rubbed them with a really cheap and nasty hand sanitizer that was stripping the oils and leaving behind sticky yackage. So let’s see what it does to those extremely hard, smooth bearings:

Hey wait a minute, that notch wasn’t there from the factory!
Unhappy Calamari

The bore of the bearing above has become egg shaped. This wasn’t even the worst one — that distinction goes to the one that was in the collector flow meter:

Escaaaaaapppeeee

I wasn’t able to pull this one apart for further inspection but didn’t need to. You can see the axle right through the plastic — it chewed completely through the ruby bearing and started digging into the plastic. Funny thing was this one would work perfectly UNTIL the water temp rose to about 46 degrees C when I put the cabinet in Beam On (normal RF output state), at which point it’d abruptly start ticking down from 12.6 GPM to 10 and the controls would kick the beam supply off to avoid meltdown. After rebuilding both sensors on the DI water side, the flow readings come up the moment the pump starts and stay stable.

This is either success or impending zeeky boogy doog
And SUCCESS
now don’t tempt me to try to fix that old radar too

Want to read more about how damn weird pure water is? There’s a somewhat sensationalized (in their usual style and don’t even get me started on that Supermicro fiasco) article from Business Insider about the Super Kamiokande which is a massive subterranean neutrino detector tank lined with the stuff that physicists have had to enter on a rubber boat for maintenance. Just imagining what that’d feel like across a large area of skin makes me want to go rub an Aloe Vera leaf on my entire body.

Really it can kinda be summed up by this poor Chia Bob Ross that doesn’t look much like a Happy Little Tree. Fnord.

HHHHHHHHHHHHHHVAC

This post contains large amounts of angry hissing and swearing. You’ve been warned.

hhhhhhhhhhhhhhhhhhhhhhhhhhhhh

I was doing the weekly inspection checklist at the transmitter site when this….. Space Station Toilet….??? went thunk, plunk, and cycled out of Beam On. The display forlornly moaned of a low anode coolant flow alarm. I know the issue is with the flow sensor.

It’s in the middle of all this so I did not try to undertake the replacement single handedly. Look at this glorious mess!!!

But then my attention was drawn to the fact that it started getting warmer in the room… and it just kept getting warmer. Luckily, it was about 68 outside with a strong Delta Breeze, so I just opened all the doors and started to investigate the attempted thermal runway. On the roof I peeked into one of the large RTU (Roof Top Unit) air conditioners and saw a winter wonderland of ice. Hmm.

Hurrrfdongs

Not good. So why’s this thing icing up? It’s practically brand new! I called the HVAC company we have a service contract with and their dispatcher literally told me she was going to see if anyone felt like helping us out today. (No.)

Time to gather tools and investigate.

Ahhh! Copeland Popsicles!

Definitely a low head pressure situation… but why? Remember, PV=nRT even for insufficient levels of T[emperature], so maybe it’s just running too cold due to low heat input into the system. Let’s open up the other side…

Oh. You know, I don’t think that belt is supposed to be flopping around like a rubbery hula hoop.

Note three things in this photo: 1) motor sheave spinning. 2) fan sheave barely spinning. 3) harder to see but— water flying everywhere including spraying on that poor little ABB drive!

Click, power down, go gather more tools, climb up and down the ladder about a zillion times…

I set the thermostat below to system off / constant fan and properly tensioned the belt, which DerpCo HVAC’s techs do not know how to do… At all… then restore power.

No windy whirly. Just freezy fuckery.

The fan didn’t start. The little ABB drive’s cooling fan wailed, but it just wasn’t coming on. Why? Finally on a whim I twisted the red and green thermostat wires together and it ramped politely up to full blast with no slippage. Guess the thermostat just isn’t letting constant fan be a thing. That’s fine…

This economizer reminds me of that enormous gear Charlie Chaplin gets rolled across.

Slowly but surely, the room temperature started creeping down.

I always wonder if I’d get in trouble for naming and shaming DerpCo HVAC. They’re a large, probably national company, and are far more interested with their prime directives of union busting and bumping out any employees with seniority than they are with providing proper service to their customers. I hate dealing with DerpCo mostly, though they have *one* tech locally who actually knows what they’re doing.

Well at least you didn’t invest everything in WeWork stock

This table has been back here sporadically on weekends ever since like 2018. The guys running it always give me such charmingly disgusted looks if I walk by it. Back when they first appeared they were more, uh, energetic and would give me impolite catcalls if I got near them while going into the Dollar Tree. Now they just look really exhausted and dejected.

My only guess as to why they’re still here: they blew tens of thousands of dollars on Trump 2020 crap thinking they were buying into a gold mine and have been trying to unload it ever since.

Your empire has burned to ash, just walk away.

Shhh, I’m hiding

Apparently.

I haven’t looked at traffic stats on this site for ages, but I have noticed two stupid things: one, Facebook now thinks all links to it are spam (and Fucking Zucc’d everyone who ever posted or shared one, very nice and typical of them) and two, Google page rank is down in the low Fuck This Shit I’m Out tier.

I suspect the loss of Google rank is due to my removing the share buttons that were causing *LOTS* of extraneous scripts to run from Facebook and useless third party cookies to be set by Pinterest and Twitter. I hope turning off the share buttons wasn’t also what caused a lot of innocent Facebook users to potentially get lobbed in Facebook Jail. Then again, what doesn’t, that site is complete trash and has an advertising market which cheerfully allows stuff like this:

Facebook: Because We Care. No wait, we don’t. Huaghgaghgghggghhghllhglfllhlllgg.

Oh, also, enjoy your ransomware campaigns. The only saving grace was that the command and control server didn’t work at the time that the ads went live. You’d think Facebook would have maybe blacklisted fake Clubhouse ads just like they’ve blacklisted, you know, this totally harmless blog…. but of course not. There’s a definite double standard at work and FB Ads will cheerfully take content that’d get a normal user thrown in the Zucc Hole.

But enough about that. Here’s my cat being adorable.

From a distant time

Transmitter sites used to be kinda different – it was not uncommon for them to be manned daily, if not outright equipped with an engineer in residence. Now they just tend to have weird ghosts and stuff. I’ve only ever seen the name O’keefe & Merritt on appliances in old transmitter site kitchens. Ok then?

Fontabulous

Just when you least expect it, what’s basically a portable scalar network analyzer starts talking to you in THIS FONT and you start disbelieving your own eyes:

Wonder if that’s from that Microsoft core fonts package that they made freely available years ago then pretended they didn’t
Oh by the way the antenna is …. Uh. It’s… not?

Root cause of that scary looking reflect plot was revealed by a quick walk up the stairs to the roof to be an almost completely disintegrated piece of LMR-400. My coworker assured me it worked perfectly fine five years ago……..

No just take it back

It’s possible this was an April Fool’s post. But anyway…

Earlier today I posted a scandalous picture of a vacuum tube to Facebook and they immediately deleted my account. I hit the button to request a review and they gave it back… Now I can see that they’re selling ad space to this thing:

Yes, that’s apparently a pepper spray equipped Internet of Turds doorbell

Yeah uh I’ll thank you not to weaponize the Internet of Turds. This needs to be filed right alongside the CellMate dick locker in the IoT Devices That Should Never Have Been Hall of Fame.

In case you’re curious about that CellMate – Click here after preparing yourself to laugh very hard.