Hello All, I'm looking for circuit ideas/suggestions for the following:
A receiver to receive a very small 8.5kHz signal using a 470uH choke as the pick-up sensor, or any other off the shelf similar small component. The transmitted source is a loop 'antenna' of wire ranging between 100m to300m total length. The avaiable signal level is very low, unfortunately I do not have the exact level details available. The receiver should be able to detect the signal from a distance of about 300mm from its source, in other words bringing the receiver within 300mm from anywhere of the loop antenna.
The signal applied to the loop antenna is coded - that is not a problem as I have the info to decode.
So what I am looking for is a front-end preamp that will provide me an approximate 2v p-p signal that I can apply to a microP to be decoded/processed.
Ideas comments views criticisms of description etc., ...and so on greatly appreciated.