this design should provide the gain equal to one at spcific radio station & zero for other frequency range.
2007-09-20 05:10:27 · 2 answers · asked by pali d 1 in Consumer Electronics ➔ Other - Electronics
Your question lacks much info and is some what confusing, but I will try to help. You seem to want a single frequency circuit for some purpose. What you mean by one is not too clear, but I think you may mean a curve with the desired frequency at the top and the next side frequency's several db down the sides. This can be done several ways, but a notch filter would be simple to design. The front end will need some sort of osc., such as a crystal or a signal diode, such as a 1N34. It would look like (circuit wise) a field strength meter with an amp in it's out put rather than a meter and a ear phone jack. There are many publications for this type of device (field strength meter) any of which could be modified to your needs. The Ham radio ARRL hand books (local library) show several fixed frequency receivers that can be used for hidden transmitter hunts for example.
2007-09-20 05:42:07 · answer #1 · answered by Dusty 7 · 1⤊ 0⤋
It isn't easy to describe in sufficient detail for you to be able to construct one, this might help you to get started.
You will need the following:
1) A tuned circuit
2) A diode detector (this is for a.m. only)
3) An audio amplifier
2007-09-20 05:43:22 · answer #2 · answered by dmb06851 7 · 0⤊ 0⤋