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Jeff.Petro
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re: Up in smoke
Jeff.Petro   8/9/2011 9:24:06 PM
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Reminds me of the time we filled a ping pong ball full of strike anywhere match heads. You'd throw the ball in the air and the challenge was to see how high it would bounce before disintegrating

anon9303122
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re: Up in smoke
anon9303122   8/9/2011 7:35:14 PM
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Ah yes, funny how you can easily forget something from your youth, yet the description of the flaming arrow on a wire to the campfire brings it all back. Camp Squanto BSA, Plymouth, Massachusetts . . . 1975 - 1980. Yikes, that was a long time ago.

David Ashton
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re: Up in smoke
David Ashton   8/7/2011 10:47:16 PM
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Naughty yes. I AM a naughty bugger. Risky...well if it blew up right in your face it might be dangerous, but unless you made a huge one you wouldn't really stand much chance of injuring yourself. I've always worn glasses but if I didn't I would wear some eye protection when installing one now. But whether I would have done at the time (I was about 19 then, and 54 now) I couldn't say. When you're 19 you think you're bulletproof.....

agk
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re: Up in smoke
agk   8/7/2011 10:36:53 AM
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This is brand new information to me on how to make a cracker using match stick heads with a electrical fuse. Very naughty and risky also.

old account Frank Eory
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re: Up in smoke
old account Frank Eory   8/3/2011 6:45:50 AM
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Wow, your post takes me back. We did exactly the same thing in a YMCA father-child group I used to belong to that was heavy on camping trips. Lots of EEs in the group, so naturally we had to have magical self-igniting campfires at our ceremonies to instill a sense of wonder and amazement in the kids. The flaming arrow shot from a bow up in a tree was always backed up by a battery and a pyrogenic electric match. Pre-soaking the logs in flammable petroleum distillates didn't hurt either :)

kdboyce
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re: Up in smoke
kdboyce   8/2/2011 4:26:26 AM
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This is similar to a trick used at Boy Scout camp. The basic idea was to light the nightly campfire by sending an lighted arrow down a slanted wire into the campfire kindling, thus lighting the campfire. For some reason, the leaders decided this was somewhat dangerous (someone had to climb a tree and light the fire) and that it didn't quite achieve the mysterious effect they want. So they opted to the above mentioned trick without the explosion. Success was achieved by multiple matches and a multiple single strands of wire. I got to set it up each night and turn it on. At the appropriate invocation, a lantern battery and knife switch set the ceremony in motion. It always worked.



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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