Gingy would like to remind you every time is the right time for petting your feline assistants.
The cool looking radar is sadly no longer in use. Anyway, as for the title, we’d been having issues with the big transmitter here for months and it just wouldn’t run on all three cabinets. Its intermediate power amp had been giving issues on one cabinet and our other engineers had been over the manual and talking with tech support for months, it just wouldn’t make wattage.
Finally the solution was to not trust the manual. It said the arbitrary “IPA Gain” number was supposed to be between 100 and 450. It was set on 100 and that led to only 9 watts drive to the IOT tube — 150 was needed. The solution in the end was … set the gain to about 520 or so. Amusingly, it only raised up from 9 watts once I went past 420.
420 blaze it
One of the other engineers had this Printrbot Simple Metal that he hadn’t gotten working so I took it back to play with it through the boring Thanksgiving morning shift. Despite it being a SOLID chonker, the carriage plate was bent up causing the hotend to hang at a weird angle, and some screws were loose or incorrect, so I fixed that and got it extruding. The only thing I wasn’t able to do which bugs me was to get a bootloader onto the Printrboard in there and load it with a newer version of Marlin supporting mesh bed leveling. This one is old and appears to take no parameters to G29 – it probes only three points. Weird. I couldn’t get Atmel’s FLIP utility to work and had issues with building Marlin for that particular cpu — it seems like you either have to use the toolchain for the Teensyduino++ or use PlatformIO, neither of which wanted to cooperate. Thus, it remains on old firmware.
A while back I noticed, hey, we’re actually using a…. plurality…. of 2000 watt halogen Fresnel fixtures in our studio. I brought up to the network’s one lighting guy that I’d found this cool (literally!) VisionSmith ReLamp System that includes a 275 watt tungsten lamp colored drop-in replacement for the CYX lightbulb… and can apparently also let you use acrylic Fresnel lenses which increase the fixture’s output even farther. He gave me this look like I’d just waved a dead skunk in his face, so I dropped the subject on the spot. Oh well, someday we’ll be able to explore MODERN technology 😉
So I’d mentioned this to someone in a thread on Facebook who got sticker shock seeing that the LED CYX replacement costs $945.25 from one vendor. The halogen CYX costs $30 (surprisingly, that’s a little less than the common HPL bulb used for Source Four lamps). I immediately thought to myself the total cost of operation must be VERY VERY much lower so I ran some back of the napkin numbers on it. These do not include the cost of air conditioning to remove the waste heat from the space as I don’t know how to calculate that off the top of my head. This is just for the bulb cost and electricity cost:
Average US electricity cost: 13.19 cents/KwH.
Rated life of the VisionSmith module: 50K hours
Rated life of the CYX halogen: 300 hours
Cost of electric power to run CYX bulbs for 50K hours: $13,190
Cost of 167 bulbs (!): $5010 Total cost of operation: $18,200
Cost of electric power to run the VisionSmith for 50K: $1814
Cost of one module: $945.25 Total cost of operation: $2759.25
Yeah—- I’m pretty sure which one I’m gonna go with.
I feel spoiled. I use DV video tape equipment sometimes and none of my stuff ever gives any issues. It just works. My stuff is Sony, Ikegami, and a couple of consumer grade mini dv camcorders. Every camera’s tape works in every other deck, dropouts are minimal and usually happen in the first second or two of rolling so if you preroll for “speed” it’s fine. My Sony DSR-1500A will even read DVCPRO media, though I’ve never tried it. Maybe I should?
Our station used to have a bureau down south in another city. This station had a 3-deck a/b roll editing system using DVCPRO. This was in service until about 2008 when everything was switched to HD when the network bought it and actually spent money on the station, unlike Shitclair which owned it in the past. Anyway, they had over 300 tapes of file footage there which were mostly dubbed on this one deck. The time finally came to get this footage transferred to the current digital archive system in use.
I’d been warned that DVCPRO tended to have alignment and timing drift issues that cause tapes to not interchange freely between equipment unless it’s all been field aligned to work together. So, thus, I tried the deck they were recorded on. First thing I found was a filthy transport, so I cleaned it up and replaced the little roller that cleans the video heads on load/eject. Please note in the picture above that there are two heads on the drum – the small interconnect boards just link the two heads to the rotary transformers.
Failure. The deck had severe picture breakup trying to play anything back.
I talked to one of my more experienced coworkers who told me to stop there and use a better deck. See, this 450 series, these were the cheap seats in the DVCPRO bowl. It didn’t even dawn on me until then that the 2-head deck is just not common! My consumer grade DVCAM stuff tends to have four or even six. I opened up one of the nicer decks and found four – it uses a finer pitch head for playback, making it even compatible with the narrower tracks of consumer DV! Also, uh, my decks are in good condition and not packed with 12+years of dust.
Ok, time to get serious about reviving some old forgotten crap.
These decks were known for having terribly bad capacitors; before the great Capacitor Plague and Samsung’s current habit of putting out lots of home electronics with crap caps, Panasonic put out a lot of gear that needed dozens of crappy smt electrolytics changed….. some on boards like this
I’m gonna go hide now ok
Finally… After hours of work I got three decks up and running and they all read the tapes from the other bureau fine! I did wind up having to revise the cabinet using brute force and power tools though because the Evertz Video Passport turns out to double as a nice space heater and almost roasted itself once I started rolling video from the 3/4″ deck through it. It needed lots and lots of ventilation. The DVCPRO decks aren’t much better about that but at least they have forced front to back airflow.
The most perplexing moment of all this was when I had one deck working great then I ejected the tape and looked back inside and found the pinch roller lying in the bottom! What the heck? I just replaced it. I don’t know.
The thing around my hair is not a ferrite core. It’s more like a slap bracelet and it’s awesome. It keeps the tail from just lying on the back of my neck.
The big hoop is an old TV/monitor degaussing coil and the box is what it came in. Don’t confuse this Jif with that other Jif. I don’t think either rhymes with Gif. Also, one of my coworkers gave me that beautiful blue hair dye, it’s from the Manic Panic line and I love it.
Thankfully I don’t have to really do any major overhaul work on these — we have the tooling in house to do it, including PCs loaded with custom software to perform certain adjustments (yikes!) and these decks don’t even speak plain English to you like my Sony DVCAM stuff does… you have to have The Fine Manual in front of you because everything is just by numbers with no text labels in any of the menus! Hurrrrrrrrrrrrrrrrrrrrrrrrrr
The transmitter…. Harris Broadcast PowerCD, a funky Inductive Output Tube based system with modular architecture supporting multiple cabinets.
The silliness: much. Much, much silliness. So here’s a hilarious one: this board is right at the power input to each cabinet and watches for power supply phase loss and provides voltage metering outputs. Power in this case is 480v 3 phase delta and the metering circuits on this card measure the voltage between A and B, B and C, and C and A. The measurement circuit is uhhhh the CACA type. 😉
So, here’s what you’re looking at. The three resistors are 15K ohm 3 watt and are wired in series with R27 (a PTC 0.15 amp polyfuse device) and the sensor coil inside that LEM current sensor.
The LEM LV25-P sensor is a Hall effect current sensor with galvanic isolation. It accepts 0-10mA and puts out a sense voltage proportional to the current input.
The resistors are dissipating 3.84 watts total on each phase, well within their rating. However, this rating was not assuming they’d be piled up like this and crammed on a board stuffed in an unventilated space in the cabinet!
The end result of this was that one of the voltage readings constantly jumped around and caused false alarms to fill the alarm log…. while we were trying to diagnose another issue.
I’m entirely confused as to why such a roundabout approach was taken to this when a set of isolation amplifiers with one side being powered off a voltage divider or even a small transformer on each phase would have worked with less bill of materials cost and less heat, but uh
I figured out an important piece of cat logic today: the tail pops out once she’s full
Getting ready to launch!
Gingy is getting really affectionate lately and asking me to pet her… Always. She’s following me around again, isn’t she? I had also called her Sandy Beach in another post which is very cute and she seems to answer to that too.
As I walked into the core to figure out why I was observing what I thought was an unwarranted audio delay, and went to have some words with the Optimod 8685, it occurred to me I have no idea what my hair looks like from the back so I took an action shot of this vital conversation with said machine and it was grand.
You can pop the tire off, but where the hell can you get a new tire?
BVU-800, I would love to know why they bothered with those slip ring contacts since this deck is NOT dynamic tracking equipped – it’s just a 4-head player.
the hell is this thing, a wannabe corvair?
An example of a U-Matic cartridge. It’s actually pretty much as small as it could possibly be for the amount of tape it holds. This is mighty 3/4″ wide tape, but the image quality looks like you recorded your footage to Scott toilet paper.
In 1986, Panasonic felt the desire to launch a competing format to Sony’s Betacam SP professional videocassette system.
By 1990 it was all but entirely gone, a commercial flop, guilty of trashing so much footage entrusted in it with massive tape dropouts.
It’s bizarre. It uses cartridges that look a lot like VHS, and it’s in fact possible to stick a VHS tape into the MII deck— and get it jammed there because it’s not exactly compatible with the loading ‘elevator’ and tape transport. It’s actually kinda more like S-VHS, but… terrible.
Apparently my station is lucky enough to have been one of the few that used the format for a while, and still has one working deck to access video on it.
The only thing I like about it is that this deck has a really cool display and the firmware will actually report to you in plain English when something’s wrong. It also uses the same reel speed ratio trick to tell you approximately how much tape is left, which Sony has had on pretty much…. every one of their professional formats, ever, so that’s nothing special, but it’s cool that it stays on the display all the time. In the photo below of the transport, you can see a roller to the left of the yellow cadmium plated elevator motor. It’s got a slotted encoder on its base that lets the deck sense the actual tape travel speed for this calculation. Interestingly, this one also leaves the tape threaded in fast forward and rewind, so you can see the timecode spin away, but on a fresh unused tape that’s never been “blacked” or used before, these sensors are the only way it’d be able to calculate the time remaining.
I’m suspecting that’s a 40×2 char VFD under the plastic there.
When I first got the deck powered up, it said “ERROR: LOADING MOTOR” or something along those lines, because the threading ring motor’s belt had lost its elasticity and grip. I was lucky enough to still have a couple of belts that fit it.
Yes, it’s got a VHS looking cartridge and a threading ring……. believe it or not that’s not the only time that nonsense has happened, there was actually a VHS transport that threaded up that way. Oh, you’d think with a name like “MII” it would use M-shaped threading like a VHS, DVCAM, or DVCPRO transport, but that wouldn’t have been AWFUL enough.
See that spinning thimble to the left of the head drum in this photo? That’s the top of the capstan. That’s the only other thing I LIKE about this powerfully cursed device: you can hold an isopropyl alcohol soaked shop towel against the capstan and turn the thimble to scrub the crappy oxide off it.
It’s got two linear audio tracks (like standard VHS) and two FM multiplexed helical scan audio tracks (like Hi-Fi VHS) – channels 1 and 2 are linear, 3 and 4 are helical. It’s like someone decided to use the worst of both worlds. Fabulous.
So if you’re wondering why I love this thing enough to have put the little drawing of Popuko on it, this deck also has the nastiest weak rack slides accompanying it, which broke and turned into a horrible ski jump while I was trying to pull the deck out of the rack to clean its heads. I was sitting on the floor and all 80 pounds or so of the thing came flying out, landed on my lap, arm, and leg, and generally left me wanting to yeet it off the roof. I’ve never had a rack slide fail in the same way these did— the mounting ears just snapped off at the screw holes like some kinda Twix bar.
It will now remain on the CART OF SHAME until it’s eventually fecking e-wasted where it belonged in the first place.
I wonder just why Panasonic even bothered with this. Everything about the system feels like they had intended to be able to create a competitor to Betacam SP that would have had a higher profit margin, BUT—- then they took every step possible to make the damn thing insanely complex and difficult to produce ????
Sometimes things just hit the wall behind the scenes but the show must go on. In this post… Teleprompter Troubles!
At some point an executive decision was made that we need to not have a prompter operator and instead the people on set should control the prompter’s scrolling. These dumb “gas pedal” controllers were installed at great effort (like, long runs of Ethernet and USB Ethernet extenders had to be installed) and it worked for, oh, about a day.
I found the problem. Springs. Why did it have to be springs?
Why I wish I never had to— oh no wait no I’d better not do that!
The coil spring around the pot shaft that returns it to zero when you let go of the pedal, which has two springs to pop itself back up, was binding up and causing the pot not to return. I coated the pot spring with grease to fix it, and coated the pedal springs as well to eliminate loud crunching sounds that’d get into Tina’s mic because she prefers to leave the pedal on the desk and press it with her hands. This worked fine and left Tina to concentrate on things like presenting the news and making adorable snack handbags for hamsters. You think I’m kidding?
A few days after I’d gotten rid of the pedal problems, the system just seemed to be hitting the wall completely with increasing frequency and vigor. First it started occasionally losing the pedals; the USB com port devices would vanish and that pedal would lose control. If it had been pressed when it happened the scroll would run away unrecoverably and you’d just have to exit and restart. On one of its more spectacular crashes it pissed off the QBox, which crashed. I power cycled it and it didn’t come back with video. Show-stopping oopsie…
This particular system from Autocue uses two parts. A Windows based PC reads the stories out of Avstar/INews or a text file and provides the user interface, and the QBox generates the actual video for the monitors.
The QBox is a Mini-ITX computer in a solid little metal box with a handle on it. It boots Linux out of a weird solid state disk module in the ATA socket and there’s a strange little three port video distribution amp bodged onto the composite video out connector from behind. I added a fan, it originally didn’t have one.
I got very anxious seeing one popped capacitor right away but that didn’t seem to be holding it back.
The issue was just a dead CMOS battery and lost settings.
After the machine going to fsck itself a minute, it came right back.
Then it just started crashing entirely, which was new and awful. On Friday it decided it was done for good and would not last through an entire show, so I started trying to get a backup image of the system to run on a newer computer. Cue four hours of massaging the drivers into Windows including loss of the USB controller entirely and having to dig up PS2 input devices….
So why did this thing put us through such acrobatics?
I opened up the PC in the control room and was greeted by this.
The SMSC chip is a “Super I/O” that lives on the pci bus and priovides serial, parallel, SMbus, GPIO, and a lot of other interface functions. Adjacent to it is an Intel chipset debug/jtag port with no connector soldered to it, just lots of corrosion. I don’t know what the substance is. I don’t want to know. It didn’t smell like anything and was pretty much solid like cement. Ew.
The other contestant earlier in the week was the WSI Max weather workstation. It’d been getting flakier and flakier for months and is due for replacement, just not soon enough.
Long story short, the video card was rotting out. I suspect the capacitors in the buck converter at the end of the card are failing as it basically ran just fine until you made the system render graphics at which point it’d just start melting down with weird memory looking issues.
In the end this was one of those “this system is discontinued, out of support, out of warranty, go source your own parts and pound sand” cases so I put an old Quadro 5600 card we had as a spare from an older generation of WSI system into the traffic computer that only renders things in 2D and liberated its monster card too revive the weather machine that does 3d…..
… just in time for us to get an ugly new graphics package company-wide with terrain that looks like dirty crumpled paper. Ewwwww!!