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Don_Dickle

IWTL how to Build an RF Amplifier (programming.dev)

submitted 4 months ago by [email protected] to c/iwtl

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I want to build / design an RF amplifier that can boost the signal from an AMT-MW207 kit.

Design goals:

Boost the signal a couple of watts
AM signal
525 - 1605 kHz baseband range

I've been searching for RF amplifier designs but many of them are too big (10's of Watts), or are hard to implement. It's been difficult trying to find something that can instruct me clearly. I'll have to take into account things like impedances and the like.

I have an electronics background, so if you can only point me towards a book or other resource, even that would be helpful.

I'm going to be checking out 'Experimental Methods in RF Design', hopefully it can point me in the right direction.

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[–] [email protected] 1 points 4 months ago* (last edited 4 months 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.

[–] [email protected] 1 points 4 months ago

Hertzian dipole

Ah, I see what you mean now. I was thinking you meant a proper half-wave dipole, which is the wrong answer.