Eshal
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Nice information. I don't know anything about lambda, but I know lambda is a wavelength.Lambda ? it is wave distance . it will given from the formula3*10^8)/F it is according to the meter . an example : consider you want transmit 27 MHZ , sine wave . it's lambda , is 3*10^8/27*10^6=11 meter
So , if you use an image reflected antenna ( lambda/4 ) it's dimension will be 11/4 =2.75 meter . it will be just a wire . but if you use dipole antenna , lambda/2 you will have two wire . first one is ground and the other one is out put . distance of your antenna will be 11/2=5.5 meter . it means two wire with 2.75 meter size . or each other kind of antenna ! but for transmitters at high powers , and frequency of HF band , most of the time , most reasonable choice is lambda/2 antenna .
I have read. But we didn't cover this topic yet in our course.( didn't you have telecommunications in university ? or perhaps didn't you read any book regarding this issue ever ?)
All resistors used in zsolt1's circuit.Which resistor you are referring to ?
OK. Thanks for this.High level transmitters will have supplies higher than that . for example a transmitter with power of 200 watt is high level . or for instance , a transmitter with power of 800 KW . it is high level and it's design steps are completely different .
I don't think that they are high wattages !All resistors used in zsolt1's circuit.
Range ? range of power or range of frequency ?Can you tell me how to determine the range of the transmitter by calculations. I want to determine the range of zsolt1's circuit.
So you are saying feedback loop seems to be missing and that is not OK. Does this circuit has problem? If so, then kindly tell me the solution. Tell me please.I can't provide info about the oscilator because i never bothered about it... indeed the feedbeck loop seams to be missing and that is not ok. I can tell more about the circuit i built only on saturday when i get home and i can take a look at the circuit (maybe i will take photo about it) .
I trust oscillator. You said that when you tested this circuit, it worked. So therefore I trust too. Should I need to be replaced the oscillator circuit still?If you do not trust the oscilator just replace it with any colpitts oscilator from the internet or from people on this forum. It will work 100% guarnteed ,
You mean they could be quarter watt?I don't think that they are high wattages !
Range of the transmitter. how far it can be heard?Range ? range of power or range of frequency ?
No, he can't. Goldsmith likes to write as if he is an engineer with many years experience. In truth, he is a young student who knows only a little about electronics. He does not understand zsolt1's circuit. If he did, he would have said something useful before now.@godlsmith can you help me with zsolt1's circuit?
Thank you for answer.all the resistors can be 1/4W or any higher power rating.
I agree with you.If you look closely, you will see that goldsmith could not even give a clear answer to that question.
Very unlikely. The available RF power will be in a 10 mW order of magnitude. But when connected to an electrical short antenna (as unavoidable for the said 350 to 1000 kHz frequency range), there won't be more than µW radiated. The second link in post #19, tries a rough estimation of radiated power. (the circuit is already using a simple kind of impedance matching and can be expected to be better than the present one in this regard).You mean they could be quarter watt?
Although I don't have much time. But I still want you to provide me exact information with exact circuit diagram till Saturday as you said above.I suggested to replace the oscillator just in case you do not have the time to wait until (saturday) i can provide exact info about the transmiter i built in the far past.
So should I replace this Oscillator circuit?I agree that the FET circuit should be seen as a hartley oscillator with coupled inductors. IMHO it's the only plausible circuit explanation. In the usual form with closely coupled coils, the right feedback coil would be made with 1/4 or even less of the left coil. Annotating the coils with apparently equal "L" suggests a more loose coupling.
Well i think you are an oracle ! because you can judge instead of each people that you didn't see him/her from near ! are you really an oracle ? if yes tell us when this world coming end ?!!No, he can't. Goldsmith likes to write as if he is an engineer with many years experience. In truth, he is a young student who knows only a little about electronics. He does not understand zsolt1's circuit. If he did, he would have said something useful before now.
No, but I can read. You wrote here that you are a university student and that you were born in 1992.Hi Godfreyl
Well i think you are an oracle !
As I said; you write as if you have many years experience.i have many experiences in HF transmitter design . because it is around 9 years that i'm studying electronics ! under guidance of old professors and old engineers and of course some peoples younger than that !
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