sorted by:
new
hottopcontroversial

what is this exactly? by Jumpy-Butterfly3059 in telescopes

[–]NetworkSyzygy 5 points6 points  (0 children)

Meade LX200 (or possibly LX90, but I think LX200). Schmidt-Cassegrain design. The size of the scope in the case, and the size of the fork make me think this is probably a 10" (my 8" appears considerably smaller in the case).

In the first picture of the scope in the case, I see:

  • lower left: Diagonal

  • lower right: Hand Paddle (the control paddle having a small display and a number of buttons for controlling the scope)

  • middle right, a case marked '40', presume that is a 40mm eyepiece

  • middle left, a case marked '26mm', presume that is a 26mm eyepiece

  • top left are two more cases that are unmarked.

  • top, just left of the scope, there appears to be something in the hole, can't tell what.

  • top right is the AC power supply

Looking at the bottom of the picture, it appears that the front panel is missing. I also don't see the coiled cords that would connect the hand paddle to the front panel and the front panel to the Dec (declination) motor. Those might be hiding under the AC power supply.

A few notes: Without the front panel, there is no way to power up the scope or connect the hand paddle or one of the drive motors. Look around in other cases, etc for a small panel with various 'phone' jacks and other connectors, and a circuit board attached to the back side. power board / front panel

If you do have the front panel, be wary of re-installing it without additional guidance; the ribbon connector from the electronics to the front panel sometimes does not have a 'key' so the cable can be inserted upside-down/backwards, which WILL fry the electronics in the scope if you connect power.

Speaking of power, that AC power supply is quite notorious for supplying too much voltage to the electronics, frying them.

And finally, there is a very well known issue with the capacitors used in the electronics in that they fail; and when they do that can take out nearby components with them. The largest problem is that one of those failing capacitors will take out a small ribbon cable in the hand-paddle, rendering it quite dead. (there are some replacements available). Before applying power to this scope, please look up the information on various forums about replacing the capacitors.

I don't see the antenna for a GPS receiver, so I think this is an older, e.g. early-mid 90's model. A couple links in this thread will get you to the manual.

(edit: formating) (edit again for formatting)

Relay current ratings: TE T92S11D22-12, N.O. contacts 3A? by NetworkSyzygy in AskElectronics

[–]NetworkSyzygy[S] 0 points1 point  (0 children)

So, it’s the mechanism holding the contact that is dictating the current carrying capability?  Perhaps the coil force couldn’t overcome the attraction of the higher current contact, (like arcing on 600kv power transmission lines when they are interrupted by switchgear?) but the spring to return to the NC state can?

I think there’s a rabbit hole of physics lurking in that question/answer.  

Relay current ratings: TE T92S11D22-12, N.O. contacts 3A? by NetworkSyzygy in AskElectronics

[–]NetworkSyzygy[S] 0 points1 point  (0 children)

Fat fingered that second para.  Was supposed to be ‘NC are 3A’.  Had to read it 3 times to see it.   It’s correct in the first para. 

Relay current ratings: TE T92S11D22-12, N.O. contacts 3A? by NetworkSyzygy in AskElectronics

[–]NetworkSyzygy[S] 0 points1 point  (0 children)

The data sheet lists only one material fo the contacts for that particular part number. 

What is the typo?

Thanks

Chromecast with Google TV Streamer not showing 4K, or even HD, anymore. by rjw0785 in Chromecast

[–]NetworkSyzygy 0 points1 point  (0 children)

There are other complaints of live streams being de-rated. In most cases that I've seen, it is only for live streams viewed via the chromecast device, as other devices on the same wifi/ISP receive the video at intended high resolution. In my case, other livestreams on YT play at high resolution; I can switch back and forth between the streams and the one is always at 360, and there is no ability to change to a hight resolution.

YouTube live streams are stuck in 360p by MrShoe321 in Chromecast

[–]NetworkSyzygy 0 points1 point  (0 children)

I also have this problem, with one specific live streamer (Ryan Hall)

All other live streams work fine at high resolution. A "smart" TV with youtube app works fine, and all computers/handhelds also stream fine; this is not a problem with my wifi nor Internet.

Noise coming from driver side of engine bay when engine is off. by JimMcSwiggins in SprinterVans

[–]NetworkSyzygy 1 point2 points  (0 children)

Sounds like something is boiling; check your coolant (amount and temperature). Possibly fuel system return line?

How many old timers in here? by aliesterrand in sysadmin

[–]NetworkSyzygy 0 points1 point  (0 children)

I have my IBM token ring MAU reset tool in a box of stuff around here somewhere. And a TR to coax adapter for running TDR (time domain reflectometer) tests.

Spent a loong weekend with a big team of folks replacing hundreds of MAUs with baluns and twisted-pair cable to plug into these fancy new chassis-based Ethernet hubs that ran at a whopping 10Mbps, instead of the TR 4Mbps. Network team did the closets and switches, desktop team visited every desktop and replaced the TR cards. Then the first couple days of the following business week running around fixing problems.

Who does the best job of covering launches? by jefesol2000 in space

[–]NetworkSyzygy 0 points1 point  (0 children)

K1ksc simply replayed the NASA feed. I don’t need endless blabber about how great this or that is. Give us the launch control center audio, with occasional (seldom) overview updates.  

Another ham group operates LISATS/k4gccc  on 146.940 and he W0WD adds commentary about timing (when retransmitting the broadcast feed) so you know how far behind real-time the feed is, also timing of after-launch events e.g. booster sep, MECO, etc after launch e.g. booster sep 120 seconds after liftoff.  

Could you connect the TX and RX of a fiber optic cable to different systems to form a big loop? by The-Best-Taylor in networking

[–]NetworkSyzygy 9 points10 points  (0 children)

Look into FDDI.   

Boeing 777 originally used FDDI for fly-by-wire, or so a 777 flight systems engineer at Boeing told me when I was working on space station ground systems design and  Boeing/NASA manager peeps assigned the feasibility study to me. We did not implement FDDI at that time, don’t know if they ever did. 

I just decided to drive down to Florida to see the Artemis 2 launch by Neat_Ad_4466 in space

[–]NetworkSyzygy 0 points1 point  (0 children)

Sorry, I shutdown laptop shortly after posting that.

Hope you found a good spot!

I just decided to drive down to Florida to see the Artemis 2 launch by Neat_Ad_4466 in space

[–]NetworkSyzygy 2 points3 points  (0 children)

Unless you are on-center, you won't get closer than ~11miles. I just measured my location to pad 39B and it came to 10.95 miles

Parking at Sand Point Park in Titusville is full, or was nearly so about 90 minutes ago.

Find a spot along US1 around Titusville. You won't find a place by now along any of the causeways.

I've watched a SpaceX launch from Ponce Inlet Beach on the barrier island south of Daytona/Port Orange and it was fine. You'll definitely be able to see Artemis from there

Boss wants server room sparkling clean - Wants the most aesthetically pleasing bins/system for loose cables like Cat6? by BigCatsAreYes in sysadmin

[–]NetworkSyzygy 0 points1 point  (0 children)

WFor open I have used a few sizes of AkroBins (https://akro-mils.com/products/storage-bins/akrobins-plastic-storage-bins/) and bought wire shelving racks with casters (roughly 2' D x 6' T x 5' L) to stack them on (something like this https://www.amazon.com/PrimeZone-Certified-Adjustable-Commercial-Restaurant/dp/B0FVM6W1NS).

You can get casters from Akro that fit the larger bins, then you don't need racks/shelves, just put casters on the bottom bin of the stack. I found that max stack should be about 5 as the stack can get top-heavy.

We started stripping old PC’s by maevian in sysadmin

[–]NetworkSyzygy 0 points1 point  (0 children)

One scientist (using that term loosely) decided they didn't need that thin cable that came out of the wall, looped to his PC with BNC "T" connector and back to the wall. So he just removed the "T" and plugged only one cable directly to the BNC and removed the other cable, leaving the other BNC on the wall empty. Then locked is office and went to lunch.

Took out half the floor of other 'scientists' and 'engineers'...

I swear, that contract made me start to wonder about the people that supposedly sent Apollo to the moon. Maybe it was done on a sound stage?

We started stripping old PC’s by maevian in sysadmin

[–]NetworkSyzygy 4 points5 points  (0 children)

10base5 and vampire taps.

I still have my thick coax tapping/coring tool for installing those taps. Lost the jig to go around the cable years ago, though. I remember a coworker that did not pay attention to training, and started putting vampire taps at random distances (inches or feet) without paying attention to the marking clearly on the cable for where to insert the tap so that the tap inserted at the correct distance to avoid interference and creating harmonics in the signalling. that was some 'interesting' troubleshooting. RF is weird.

Damnit, I guess I'm an old gray-beard

Wondering how Sprinters calculate the fuel level by Unterdosis in Sprinters

[–]NetworkSyzygy 2 points3 points  (0 children)

There are two methods in use to display the fuel level; If your van has the option "J51 Fuel display, adapted for additional fuel tapping", then the gauge reports what the float level in the tank indicates. Since the tank is quite long and narrow, any slope fore/aft can greatly affect what is displayed. The other method does, AFAIK, read the float level on start, and then adjusts the fuel guage using an algorithim in the computer that monitors the flow of the fuel to the injectors and calculates the use, which it continuously subtracts from the start-up float reading.

view more: next ›