I don't see why you shouldn't be able to use the config. in #4, but with a circuit that simple, I think I'd start by building it up on some protoboard and see if it works. It's only like, 7 parts or so. Maybe you could add a choke to the voltage supply on the op amp.
I don't see why you shouldn't be able to use the config. in #4, but with a circuit that simple, I think I'd start by building it up on some protoboard and see if it works. It's only like, 7 parts or so. Maybe you could add a choke to the voltage supply on the op amp.
Not sure what you mean by protoboard
a better antenna.
As far as the 3rd mmic amp, the rlc network is a power filter. The r-c filters the supply coming in, and the L let's dc pass to power the amp, while keeping RF from bleeding back out to the power rail. The 1nf on the input and output are just a.c. coupling because the amplifier will have a dc bias on each one.
I also don't know what your local regs are, but generally the band is shared globally and secondary/ISM users must accept interference from primary users. Bear in mind those primary users may well be applications with military, radar or space use, and they won't take very kindly to interference from unlicensed or secondary users.
The third harmonic is often used by aviation radionavigation, and although they model out interferers it won't take much for your signal to appear, and bearing in mind the perceived safety-of-life aspect you need to make sure that whatever you come up with isn't going to upset someone.
You should check your local regs if you haven't already.
The network on the output is trying to match the impedance of the transistor output stage to the antenna to obtain maximum power transfer. Remember maximum power transfer theorem at DC? This is the same, but at AC. It will also have some filtering effect, but not a whole lot judging from the circuit...
To match one complex impedance to another, it's common to use a combination of an inductor and a capacitor. There are online calculators to do this, but in the old days we used Smith Charts.
http://www.daycounter.com/Calculators/L-Matching-Network-Calculator.phtml
https://home.sandiego.edu/~ekim/e194rfs01/jwmatcher/matcher2.html
+ many others.
I'm no ham, but my very first reaction to "[what is the] Simplest Method [of] Amplifying [a] 433MHz Radio" is "a better antenna."
So the alternative question is, "what is your goal?" If my assumption is correct and it's get more usable distance, and if you can afford to be directional on at least one end, I think you can get a lot of gain passively with a better antenna.
Unfortunately that's the end of my knowledge in this area so I'll stop.
I don't see why you shouldn't be able to use the config.
at the power output level you are looking at just a simple transistor and low pass filter would work for you.
I think a class A transistor amp would be much easier to tame that a fast op amp. You will likely need a low pass on the output to keep spurious emissions down.
nobody complaining about interference or legality
nobody complaining about interference or legalityI think a more complete statement would be "nobody has yet complained to me about interference or legality".
nobody complaining about interference or legalityI think a more complete statement would be "nobody has yet complained to me about interference or legality".i mean, the 2.4GHz Tx is pretty much mainstream (used by Turnigy rc remote controller) in rc community used by hundreds if not thousands, and no serious report i'm aware of in the net regarding that... although, it has modern tech like freq hopping or what not that is also beyond me..
Sanity check: if, knowing the components' IP2 and IP3 specification, you cannot predict the output spectrum of the transmitted signal, then you don't know enough to predict whether you will cause problems. And once you can predict it, you will have enough knowledge to realise that you must experimentally test the transmitter and transmissions.
"I haven't seen any serious reports on the net about people that have been injured by walking into a road without looking", with the implication that it is OK to do so!
I think a class A transistor amp would be much easier to tame that a fast op amp. You will likely need a low pass on the output to keep spurious emissions down.
I think a class A transistor amp would be much easier to tame that a fast op amp. You will likely need a low pass on the output to keep spurious emissions down.
I think you mean class C amplifier, which is the more common linear amplifier configuration for RF. It is far more efficient than a class A amplifier.
What's the point of the 50 Ohm resistor?
What's the point of the 50 Ohm resistor?for opamp protection from capacitive load? and possible short? and from my basic lesson 101 here in eevblog few years ago... that a properly 50ohm terminated at cable end must be from 50 ohm source, to make the whole transmission line 50 ohm impedance flat, and maximum (half) power transfer, no? i'm no ham and no rf guy, so i'm ready to be educated.
It would take a long time anyone here to generate information to educate you. And they would do a poor job compared with the vast amount of high-quality information that is readily available at your fingertips. You demonstrably even know the relevant search terms!
It will be best if you actively educate yourself, rather than passively expect to be educated.
It would take a long time anyone here to generate information to educate you. And they would do a poor job compared with the vast amount of high-quality information that is readily available at your fingertips. You demonstrably even know the relevant search terms!
It will be best if you actively educate yourself, rather than passively expect to be educated.a quick tip might help. i will educate myself when thing get serious. for now i have many things to do than the time i have, i'll take it slow and steady. furthermore, i believe even though after i mastered the voodoo maths and concepts, empirical study is inevitable, meaning that i need the tool to verify, meaning that i need to gather resources to get one, meaning that getting resources first is quite a better idea to do for now, imho. but a quick free tip and advice on my mistake here might give me some idea.. thanks.
It would have been polite to mention that you aren't "serious" (whattever that might mean) about the answer in your original post.
thanks for the link its broken, but i get your idea.
the basic 101 transmission line i learnt back then was about coax cable and end to end points on a pcb. rf is different,
my capability is rotting. thanks.