I want measure the distance between a small mobile 27MHz transmitter and a fixed receiver, the maximum distance is 10meters. I'm only interested in have far the transmitter moves relative to the receiver. I should be able to use the phase difference between the received signal and a local oscillator to calculate the change in distance.
Since I only need a maximum of 10m, a 27MHz rf signal would be ideal.
Building a simple 27Mhz transmitter is simple but I'm struggling with the receiver.
Initially I thought a super regenerative receiver would work. I have tried to build a couple but failed, ( I did make a nice 27Mhz oscillator though). On reading more about this type of receiver, I'm not convinced it would work anyway as I think the quenching will destroy the carrier that I want to keep.
So what I want to do is receive the RF signal and amplify it so that I keep the original signal and maintain the phase. Once I have the receiver working I will add the local oscillator and phase detection. At this point I'm not interested in any modulation.
I have search the internet but I think my terminology is wrong as I cannot find any info.
Can anyone point me to the type of receiver I need for this. With simple circuits based around the 2n2222 if possible
Thanks
Garry
Since I only need a maximum of 10m, a 27MHz rf signal would be ideal.
Building a simple 27Mhz transmitter is simple but I'm struggling with the receiver.
Initially I thought a super regenerative receiver would work. I have tried to build a couple but failed, ( I did make a nice 27Mhz oscillator though). On reading more about this type of receiver, I'm not convinced it would work anyway as I think the quenching will destroy the carrier that I want to keep.
So what I want to do is receive the RF signal and amplify it so that I keep the original signal and maintain the phase. Once I have the receiver working I will add the local oscillator and phase detection. At this point I'm not interested in any modulation.
I have search the internet but I think my terminology is wrong as I cannot find any info.
Can anyone point me to the type of receiver I need for this. With simple circuits based around the 2n2222 if possible
Thanks
Garry