Hi,
Im about to start designing a rough and dirty AM or FM reciever.
My Specs are as follows:
1. Must run @ 3V with v-low current requirment
2. Must be very small outline on pcb ( < 10mm sq.)
3. Will be used to receive digital data (on / off) @ <1K bits/sec (can be slower if req'd)
4. Output will be interfaced to a 3v micro-controller (PIC).
5. The transmitter can be either 418Mhz / 433Mhz.
6. A minimum range of 20m (internal) is required.
Depending upon the best Rx solution, the Tx will be choosen to fit later, the Transmitter will be an off-the-shelf solution to enable 'licence exempt' status.
Can somone point me in the right direction here, i have no idea where to start.
I've looked into Rx theory but everything appears to be geared to the commercial radio bands (88-108).
Should i use FM or AM ? I know FM has a better noise rejection, but will there be that much noise in the system?
<confused>
Im about to start designing a rough and dirty AM or FM reciever.
My Specs are as follows:
1. Must run @ 3V with v-low current requirment
2. Must be very small outline on pcb ( < 10mm sq.)
3. Will be used to receive digital data (on / off) @ <1K bits/sec (can be slower if req'd)
4. Output will be interfaced to a 3v micro-controller (PIC).
5. The transmitter can be either 418Mhz / 433Mhz.
6. A minimum range of 20m (internal) is required.
Depending upon the best Rx solution, the Tx will be choosen to fit later, the Transmitter will be an off-the-shelf solution to enable 'licence exempt' status.
Can somone point me in the right direction here, i have no idea where to start.
I've looked into Rx theory but everything appears to be geared to the commercial radio bands (88-108).
Should i use FM or AM ? I know FM has a better noise rejection, but will there be that much noise in the system?
<confused>