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I am not learning everything by asking to others. Im learning by myself, with my thinking and asking when I need/want.
No, you dont need to read ! Reading too much is not healthy.
You need to understand electronics and you need to practice. I understand and have skills to design and build a...
OK, I will think about it.
I built a board and it doesn't work. It draws only 20-30 mA..
What are these "mismatch losses" ?
Due to transistors internal capacitances ?
Due to some feedback via air ?
Emitter followers are not used in RF or only push-pull is not use ?
I like emitter followers...
This is not a powerful transmitter to upset a lot of people. Actually it won't upset nobody and I will operate it for a short periods of time, when I experiment and learn.
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I updated my schematic and think that this output stage cannot oscillate.
This one is very clean and...
A contact point is half a capacitor between the board and the connector.
As we know, capacitors conduct more the high frequencyes. When the frequency is high, it gets out of the PCB board.
SLK001, I've seen routers that use a contact points instead soldering. Im new to RF and haven't tested...
Routers that doesn't have sma connector have their antenna soldered to the board so its not a problem to solder it.
I've also know from somewhere that soldering degrades the signal but I dont believe this and think that its untrue.
If you dont want to solder it, there is no problem to use a...
FvM, I think the only source of parasitic oscillation would be Q7 and a fix for that would be a 10p between the Q7's base and collector.
Im going to etch a PCB and try out.
I like the class B output stage very much because of its current drive capability that can drive a very long antenna or...
Why? Im wondering. Because of possible parasitic oscillations ?
Yes if you dont want to transmit at 2-3 different freqs in the same time with 1 transmitter :D
I dont want harmonic suppression, I want to transmit at 90Mhz, 180Mhz and 270Mhz in the same time, with 1 transmitter D:
I see the...
No I can't. I tried and It doesn't worked.
However I succeeded to make one with MCU and a tiny OLED display.
I will post photo later when I get my grandmother's mobile phone to make one.
Im using old Nokia 6300, the camera is not good, its usb is the old standart and I dont know where are my old...
BigBoss, this is IC is very expensive too.
betwix, interesting experiment, I will try for sure. Thanks for the idea!
I didn't know that there are tuners with digital IF out.
I am talking about tuners with digital tuning.
My progress as follows:
I cut the TV board where is the IF...
BigBoss, very good IC but its very expensive: 30$ for 5 pcs and I need to wait 1 month to arrive because I can't find it in my country, in Bulgaria.
betwix, Are you talking about a relation between the carrier amplitude and the IF out amplitude or you are talking about a relation between the...
Not FM transmitter over tuner.
Im talking about:
FM transmitter -> antenna
another antenna -> TV tuner -> signal strenght measurement
I've readt that the tuner supports the FM band: "Low band - 69.25 to 154.25 Mhz"
There is a pin named AGC but my father told me that its an input and I need...
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