Isoprenoid

joined 2 years ago
[–] Isoprenoid@programming.dev 1 points 1 year ago* (last edited 1 year ago) (1 children)

Efficiency might not be the point, but not frying your amp is good.

I don't want to break the amp, but I'm expecting my first attempt to be non-ideal.

I’d guess that the know-how to do that would amount to a good crash course in many of the other analog concepts you might need, like what near-field means.

Yes, that is exactly why I am asking here. I was hoping someone could point me in a direction.

MW is defined as being over 100m wavelength, so any antenna below 25m is electrically short in those frequencies.

Yes, I would likely use a Hertzian dipole. Which is inefficient. So not likely to cause much distant interference.

[–] Isoprenoid@programming.dev 1 points 1 year ago (3 children)

This came across as someone who might not know what they’re doing.

Yup, that's why I'm here. I thought that was the point of "IWTL"?

What’s your plan to manage the resulting SWR?

I have a NanoVNA so could build a small dipole. High efficiency isn't really the point.

I'm not going for anything fancy, I just want to know the basics of how to design and build an RF amplifier.

What this device’s output, exactly?

It's only in the mW region. The effective transmission is only within a metre (3 feet) of the device.

how many dB

Gain can be small, even if it's 10 or 20 dB. I want to learn the principles of design and then I can work from there.

[–] Isoprenoid@programming.dev 1 points 1 year ago* (last edited 1 year ago) (6 children)

Using somebody else’s band, besides being a crime, is just kind of a dick move.

This depends on the jurisdiction, and the amount of interference. I'm not from the US.

The amount of power I'll be using won't even interfere with suburban neighbours.

https://en.wikipedia.org/wiki/Short-range_device

What’s your use case, exactly?

Transmitting music to AM receiver radios in a house.

[–] Isoprenoid@programming.dev 7 points 1 year ago

It helps to discuss problems with someone, even if they aren't an adult. It helps with getting different perspectives, because we all have blind spots.

If you're determined to go it alone, I at least recommend Rubber Duck Debugging.

I couldn't tell you how many times this technique has helped me work out what was wrong my code / problem. The majority of the time it's something simple.

[–] Isoprenoid@programming.dev 26 points 1 year ago

And think about the savings in road rage stress, and time wasted commuting.

[–] Isoprenoid@programming.dev 4 points 1 year ago (2 children)

Video is not available in your country.

[–] Isoprenoid@programming.dev 10 points 1 year ago (44 children)

Can someone explain the joke?

[–] Isoprenoid@programming.dev 58 points 1 year ago

That officer has a history of other complaints, including from his former colleagues, according to the sheriff.

"There was no way that we could have prevented this."

[–] Isoprenoid@programming.dev 20 points 1 year ago* (last edited 1 year ago) (1 children)

Hey! That's "Mr Moron" to you.

[–] Isoprenoid@programming.dev 9 points 1 year ago

The Invisible Hand be on us all in these difficult times.

[–] Isoprenoid@programming.dev 17 points 1 year ago (1 children)

Best I can do is outsourced genocide and apartheid so we can pretend that it's weird.

[–] Isoprenoid@programming.dev 26 points 1 year ago

From the article:

Overall, 43% of the products studied exceeded acceptable levels of lead and 35% exceeded cadmium levels, according to the study, which was based on a California law that sets maximum allowable dose levels for heavy metals in food. Food researchers often use the 1986 regulations, known as Prop 65, as a safety standard because the Food and Drug Administration doesn’t set limits on heavy metals in most foods, said Leigh Frame, director of integrative medicine at George Washington University School of Medicine and Health Sciences and lead author of the study.

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