Hello,
For one, I'm not sure if I posted this in the right place, I initially wanted to post it in the DIY section, but.. it's kinda ghostly in there, if you get me. Mods, please move to the appropriate section if needed.
Alright, so, I have built a radio transmitter using this schematic:
[img]http://www.pcs-electronics.com/schematics/Small_Fm.jpg[/img]
I went on and created a PCB on SprintLayout, then did the rest of the oxidation processes and such. And it does work, but not on radio frequency. Using an inductance calculator from a program called Rfsim99, I calculated the resonant frequency of the coil to be around 500 MHz - five times higher than standard radio frequency. I then proceeded to do more calculations to see if I can get the resonant frequency to an acceptable value; I came to a conclusion that a 198 nH (30 mm long, 5 mm diameter, 16 turns, air core) would give out a resonant frequency of 103.25 MHz. I changed the coil on the PCB, but to no avail.
Here is the layout of the PCB:
[img]http://gyazo.com/8cc0581f9be3e926b93312fdcd0d7151.png?1333184213[/img]
Dimensions: 80 mm long, 50 cm wide
I addressed some people from various electronics shops around my town, and I got some info. One shop owner said that I must modify C3 until the modulation starts and that with C2 I can modify the emitting frequency - the problem is that I don't know when exactly that happens.
If you need me to give you guys more info, please ask. Thank you in advance.
I MUST ask this. Does it have a cup holder just yet? If not, when and where are you planning on adding the cup holder? The issue with most radio transmitters is that they do not have one. Trust me on this.
[QUOTE=CaptainHijacks;35368209]I MUST ask this. Does it have a cup holder just yet? If not, when and where are you planning on adding the cup holder? The issue with most radio transmitters is that they do not have one. Trust me on this.[/QUOTE]
Uhm, no, it doesn't have a cup holder. What issue would it solve though?
[QUOTE=supervoltage;35368306]Uhm, no, it doesn't have a cup holder. What issue would it solve though?[/QUOTE]
It would hold your cup. For you.
[QUOTE=Xybjj;35369586]It would hold your cup. For you.[/QUOTE]
Alright.
The posts above clearly shows why you cannot post thread like this in GD. People won't take it seriously and would only throw shit all around the place like a bunch of apes to compensate for their inability to answer your question.
I'd suggest you to post in the Electronics thread in the Programming section.
[QUOTE=VistaPOWA;35370405]I'd suggest you to post in the Electronics thread in the Programming section.[/QUOTE]
Alright then, will do. Mods, please close this thread.
Are you trying to do simple baseband modulation?
[editline]31st March 2012[/editline]
I just ask because a normal AM/FM radio would not respond nicely to that, if that's what you're testing with
[editline]31st March 2012[/editline]
No wait that's FM
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