#275

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IMSAI Guy

Күн бұрын

episode 275

Пікірлер: 21

@robertgarrett7887 Жыл бұрын

Those thermometers see IR from an exposure cone that grows with distance to the surface. So if you're holding it say 10 inches from a surface, it's averaging temp over a circular area of something around 3 inches diameter (depending on device). So when temping a small surface like this you'd get a more accurate reading if you hold it very close. Love your project, really nice build.

@IMSAIGuy Жыл бұрын

yes, that was an old video. companies have given me thermal cameras for review and I use those now.

@thomasmaughan4798 2 жыл бұрын

Nice tools! Those exact center punches -- I haven't seen that but I can see where it allows to drill precisely in the center of a mounting stud.

@PapasDino 5 жыл бұрын

Even with a proven attenuator/tap I always sweat bringing any transmitter power close to the input of my spectrum analyzer! Great repurposing, thanks for sharing. 73 - Dino KL0S

@justinruth9729 Жыл бұрын

Nice now instal a BNC for tapping rf

@IMSAIGuy Жыл бұрын

I did, not sure if I filmed it. but I also added a 20dB attenuator: kzfaq.info/get/bejne/l7mTq72QlqncYIU.html

@JayN4GO 4 жыл бұрын

You have all the tools for this

@clevc112 3 жыл бұрын

Touches resistor and doesn't realize he is getting burned by RF energy.

@IMSAIGuy 3 жыл бұрын

Unfortunately I know how that feels. it was thermal

@gixerags750 Жыл бұрын

Can this type of resister be submerged in a tin can of oil for heat dispersion? Thanks.

@IMSAIGuy Жыл бұрын

I don't think what would work well. if you put it on a heat sink and then put that in oil, maybe

@gixerags750 Жыл бұрын

@IMSAI Guy ok..that makes sense.. Thanks.

@mstover2809 8 ай бұрын

I know this is an old video - it is taking me awhile to watch all of these :) - but MY thought would be to fill the cavity with oil!

@gabrielM1111 3 жыл бұрын

Hey, the thin tab on mine broke flush off while i was wiping some heat grease off. Any ideas what to do? Thanks

@IMSAIGuy 3 жыл бұрын

buy a new one :(

@gabrielM1111 3 жыл бұрын

@@IMSAIGuy what a waste, why the Fuk would theu puy a foil thin tab on it especially knowing how hot it can get too

@gabrielM1111 3 жыл бұрын

@@IMSAIGuy @PCS electronics i fixed it by removing the top white slice with the lettering and soldering a thin tin tab to the what was left of the broken tab then crazy glue the slice back on top. Resistance did change however from 51 ohm to 58 ohm. tested it on my cb radio & amp outputting 240 watts. No problem. I have it mounted inside a metal electric outlet box with a metel cover and 4 holes punched out. Straight Solid copper wire from resistor to center of pl259 on the opposite side of it. Would have ordered a new one but it take a month for delivery from China