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#51
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In article ,
"Michael A. Terrell" wrote: Telamon wrote: No I have not worked with FQPSK modulation. My work involves digital signals mostly. I consider the environment to be mixed signal as a best description. Telecommunications and data communications semiconductors from low line rate to 10 G/bit is what I work on in the production test area. All these signals need to transverse circuit boards and various connectors and cables. Rise and fall times as fast as 18 ps and clocks up to around 12.5 GHz. It real fun trying to measure rise and fall times that fast and jitter on the edges and all the data eye measurements that come into play. I design the circuit boards and specify everything else. I worked in engineering and on the production floor when the RCB2000 was released to production. Most of the radio was on VME cards but there were about a dozen other small boards not counting the ones in the RF sections. About a dozen processor chips including the Aaeon PC-104 embedded controller and the PC-104 IEEE-488-2 interface board. I know what you mean about measuring signals in that range. Unfortunatly, some of the other techs were good at RF but couldn't handle digital so I got stuck with troubleshooting $8,000 mixed signal circuit boards that no one else could fix. I had to fight with our MEs to change the paste solder because of flow problems in the oven and to switch to Ersin solder for rework. Have you ever used .015" solder while working under a stereo microscope? It takes steady hands. Yes I have. I can't do it without the microscope. The smallest I have worked with is 0402 size under 10X. We have parts that are half that size now but I have not solder them myself. If I'm planning to do do some soldering work I don't take my morning coffee. It's just a physical skill that many engineers don't have so I end up fixing things for other people. -- Telamon Ventura, California |
#52
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Telamon wrote:
Yes I have. I can't do it without the microscope. The smallest I have worked with is 0402 size under 10X. We have parts that are half that size now but I have not solder them myself. I've worked wit 0402, but the parts I hate are those resistor packs the size of a 1206 that solder down the sides. If I'm planning to do do some soldering work I don't take my morning coffee. I don't drink coffee but I had to have caffeine to steady my hands so I kept a cold 2 liter bottle of Diet Mountain Dew in my Coleman cooler with my lunch. I get a lot of headaches and the only things that take the edge off are chocolate and caffeine. It's just a physical skill that many engineers don't have so I end up fixing things for other people. Most of the engineers I've worked with shouldn't be allowed near a soldering iron. I had to strip and rebuild so many prototypes it wasn't funny. They worked too slow and used too much solder so there were a lot of bridges and cold joints. Its fun trying to test a wideband synthesizer with electronically switched multiple inductor segments that was hand assembled to test a design change when the engineer couldn't solder. Some off the techs were just as bad, though. -- Former professional electron wrangler. Michael A. Terrell Central Florida |
#53
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y'all know what happens to the caffeine they remove from (they don't
remove it all though and I prefer my coffee non decaffeinated) non caffeine coffee? The caffeine is sold to soft drink companies and other kinds of companies.They sure don't through that caffeine away! cuhulin |
#54
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wrote: y'all know what happens to the caffeine they remove from (they don't remove it all though and I prefer my coffee non decaffeinated) non caffeine coffee? The caffeine is sold to soft drink companies and other kinds of companies.They sure don't through that caffeine away! cuhulin Let's see, you drink light beer and don't drink caffeinated coffee. Are you some sort of sissy boy? I thought so! Les |
#55
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LOOK at that Piece of ****! Les the LOSER! mouthing off!! He/she/it just
doesn't GET IT! I Love CAFFEINE! cuhulin |
#56
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wrote: LOOK at that Piece of ****! Les the LOSER! mouthing off!! He/she/it just doesn't GET IT! I Love CAFFEINE! cuhulin I just wanted to see how far I could pull a turd without a string...... You floated up to the occasion asswipe! Now, go screw your dog again. Les |
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