Home made radio Reciever... AM or FM?

Wireless & IoT
1

Hello guys! I’m worknig for a new project… actually is a birthday present for a friend of mine…

As always please excuse my English… If I’m not wrong what I want to make is an “intercomunicator” (or something like that)… The idea is to build a device like a radio transmitter/receiver, so 2 people can talk to each other. The idea is to use it when traveling on a motorbike.

Well the problem is that I don’t know if I should use an AM or FM transmitter/receiver… Range is not a problem (50/100mts would be ok… or more) I want to power it with some battery (I preffer 1.5v or 3v but it could also be 9v. The problem with 9v-batteries is the mAh of them)

And above all, I don’t want (if possible) to mess around with inductor so I’d like the oscillator to be made of a cristal (or some easy PCB coil)

What I’m looking for is circuit schematic for the transmitter and the receiver… I guess they would be FM… but I don’t know wich one (AM or FM) is the best choice for my project.

Take a look at this circuit (click on green font to see the schematics): http://www.electronic-circuits-diagrams … ckt8.shtml

It says it would be working at 96.3Mhz… and the antenna could be an aerial of 1/4th wavelength (I guess lambda/4 of 96.3Mhz at speed of light, right?)

And is there an easy way to build a FM receiver without using any IC?

Thanks in advance!!! I would be very happy if I can sourprise my friend!

2

Check the regulations in your country. What you are doing is probably illegal.

Leon

3

Topic says “receiver” but goal seems to be transmitter.

4

You cannot transmit audio by comercial FM band (80-108Mhz). In Spain, it’s legal if you transmit up to 70mW.

You should use the amateur radio band (144 y 146 MHz) at low power, but if you want more you will must get a radio licence.

Suerte :wink:

5

And in most of the world, it is NOT legal to transmit in the amateur radio bands without a license. It’s not too hard to get a ham license, however.

/mike