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  • w9sz commented on mikeasaurus's instructable Unusual Uses for Vaseline6 months ago
    Unusual Uses for Vaseline

    I was going to comment on this (putting Vaseline or ANYTHING on a lens) but saw several others already did. Expensive camera lenses have special coatings on them that act as filters. You risk damaging them if you put anything on them.

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  • A directional coupler is used to supply a small amount of RF power in proportion to the power entering one of the ports of the coupler that the full power is entering. Most have either three or four ports. Two of the ports are connected to the source and load of the RF power. The third provides a sample of the power going into one of the two ports mentioned above. They are usually labeled as to which port is being sampled. The directional coupler sampling port usually supplies much less power output; perhaps 10, 20 or 30 dB down from the input to the port it is coupling. For an example, a power source may be supplying 100 watts to a 50 ohm resistive load. There is no reflected power from the load. Let's say it is a 30 dB coupler. If the directional coupler is connected to sample the inp...

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    A directional coupler is used to supply a small amount of RF power in proportion to the power entering one of the ports of the coupler that the full power is entering. Most have either three or four ports. Two of the ports are connected to the source and load of the RF power. The third provides a sample of the power going into one of the two ports mentioned above. They are usually labeled as to which port is being sampled. The directional coupler sampling port usually supplies much less power output; perhaps 10, 20 or 30 dB down from the input to the port it is coupling. For an example, a power source may be supplying 100 watts to a 50 ohm resistive load. There is no reflected power from the load. Let's say it is a 30 dB coupler. If the directional coupler is connected to sample the input terminal, it will have 100 milliwatts available. If it is connected to sample the output terminal, it will have 0 watts available, as there is no reflected power.Now suppose the output of the main path of the directional coupler is not a 50 ohm resistive load. There will now be an SWR different than 1:1 and some power will be reflected from the load back into the output terminal of the directional coupler. Connecting the directional coupler to sample the output port. The coupler will show some smaller amount of power at its coupling port, but not the full power. It will be 30 dB down from the true reflected power.Directional couplers are useful for several things. Measuring power through the coupling port is one use. Measuring 100 watts with a 30 dB coupler, you will only need to measure 100 mW. Most power meters can handle that. Another use is to measure reflected power from the load port. If the load is not a 50 ohm resistive load, you can measure this power and calculate the SWR. You may connect a matching network between the directional coupler and load and use it to match the load to the source so the load appears to be a 50 ohm resistive load to the source. This is done by adjusting the matching network so the reflected power measures zero.I hope this makes sense to you. A diagram would be a far better explanation.

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  • Illuminate Lightbulbs Wirelessly: DIY Slayer Exciter

    Note - although this circuit is not big enough to produce brush discharges like its big brothers, it produces enough of a field to damage or destroy tiny, sensitive electronics such as cell phones, digital cameras, etc. Keep them far away from it!

    Yep.

    Probably. I'd say try it and see.

    Note - although this circuit is not big enough to produce brush discharges like its big brothers, it produces enough of a field to damage or destroy tiny, sensitive electronics such as cell phones, digital cameras, etc. Keep them far away from it! ju it!itjus

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  • w9sz commented on thebeatonpath's instructable DIY Yellow Jacket Bottle Trap1 year ago
    DIY Yellow Jacket Bottle Trap

    If you go after their nest at night, you CAN use a flashlight if you use a red one or one with a red filter. They can't see that color.

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