antenna or coil parts for 5 kHz cardiac strap RECEIVER ideas anyone ?

Hi people

Those cardiac straps transmit by a 5 kHz on/off -modulation magnetic
field by means of a 5-7ms burst for each heart beat. They make these
things in the millions. The range is about 3 feet.

I can easily make a RX coil for this, but as I want to make quite a
few, I am hoping someone here can point me to a manufacturer or a
source of some device that can take this RF signal, amplify & clean it
up, and pump it into a MPU that will be able to calculate all kinds of
stuff, like optimal krebs cycle zone.

I'll wager someone has made an ASIC that is an antenna, processor etc
all in one which is what they put into the watches.

 

You lose; at that frequency, the antenna must be external.