Qw3rtzuiop, factory, onsokumaru, Vince and 31 Guests are viewing this topic.
I ran across this picture of the London Underground and I'm very curious about the unusual track arrangement. I noticed a center rail like Lionel trains. Does that carry power? And if so, what is the purpose of the side, what we call here "3rd rail", that apparently the trains have a shoe to contact.I'm thinking one side is voltage and the other ground? Yes?
OK makes sense....4 rail system. Unlike typical subway here where the 3rd outside rail that the shoe contacts is +600VDC and the riding rails are grounded or the return path.
Quote from: mnementh on December 12, 2019, 08:40:05 pmNo, actually, the thing commonly called "duct tape" (or my favorite, NASCAR tape) was originally created for the US Military by Anderson tape MFG during WWII, on request for a waterproof sealing tape that could be used for temporary repair of tents and tarps, etc. This came to be known as "Duck tape" from the saying that it sealed "tighter than a duck's arse, and that's watertight", and would even seal when wet. It came to be used for sealing metal ductwork after the war, and then came about the whole "Duck Tape/Duct Tape" argument.During the evolution of the companies involved, different colors evolved from the original GI Tan & Olive Drab to grey and silver for its popular use in ductwork, to black/white/blue for its use in music, theatrical and film productions. It was sometime around the age of Star Wars that descendant company MANCO made the "Duck Tape" name official and introduced a variety of colors for the consumer market.mnemTape that duck!!!As charming as that story is it's apparently called after duck cloth. That story won't quite make the same impact on birthdays though. https://en.m.wikipedia.org/wiki/Duct_tape
No, actually, the thing commonly called "duct tape" (or my favorite, NASCAR tape) was originally created for the US Military by Anderson tape MFG during WWII, on request for a waterproof sealing tape that could be used for temporary repair of tents and tarps, etc. This came to be known as "Duck tape" from the saying that it sealed "tighter than a duck's arse, and that's watertight", and would even seal when wet. It came to be used for sealing metal ductwork after the war, and then came about the whole "Duck Tape/Duct Tape" argument.During the evolution of the companies involved, different colors evolved from the original GI Tan & Olive Drab to grey and silver for its popular use in ductwork, to black/white/blue for its use in music, theatrical and film productions. It was sometime around the age of Star Wars that descendant company MANCO made the "Duck Tape" name official and introduced a variety of colors for the consumer market.mnemTape that duck!!!
Oh, I see, I thought it was something awful that we were about to drop in
Bought another frequency counter In general I appreciate the product made by BG7TBL (Chinese HAM ?). The Gpsdo, noise source and low freq upscaler I bought are all working fine and were really affordable. He recently created a high resolution frequency counter. Got 2 inputs (0-200Mhz and 30Mhz-6Ghz), 11 digits resolution, integrated power meter, switchable 50/1M termination and USB (for data logging and automation). You can feed 10Mhz in the back or use the internal Ocxo. Best of all, it make absolutely no noise
How do you rate the accuracy of the pwr meter?
So... how long does it run on a 9V battery...?mnem
OTOH... ehhh. It's fucking tape. mnem*poring over schizzmatics on a 15-year-old TV* *tzzzzt*
DIGITS !!!
Two component recommendations needed:I have to replace some of the tiny tantalum electrolytics (mostly 1uf and 0.1uf, 35VDC) in the Tek 184 and one of the TMxxx modules. They are all being used as filter capacitors on the DC rails. I am inclined to use the Vishay 173D series solid tants, which fit, aren't terribly expensive and seem to have good enough specs but... any of the Tek restoration folks here want to make a different recommendation?Second thing... I am going to upgrade the alligator clip connector on my DE-5000R, which means I'd like to find some decent quality two conductor shielded test lead cable. Doesn't have to be expensive or six point five digit special. It does have to be test lead flexible and probably 18 or 20 gauge. Anyone have any recommendations? Oh yeah, I'd prefer to not buy 100' of anything. Thanks all!
Quote from: Kosmic on December 13, 2019, 02:36:41 amDIGITS !!! Is it just me, or is that much "precision" just, well, a little bit suspect?
Quote from: mnementh on December 13, 2019, 03:14:46 amSo... how long does it run on a 9V battery...?mnem Nahh was for scale But since it's taking 12V DC in, would be easy to run that thing on battery.
<~~~ Yeah... aboot dat hoser over dere... Anytime you see him sign widdat little debbil grin, you can be double-damn certain he's just agitatin' fer the sake of agitatin'.