We are now able to use FM radio band from 88mhz to 108mhz FM to transmit a very low RF signal of about 10mw people are now useing this for MP3 players in cars so you can listen to the MP3 player on the car radio, idear is to use this RF link to transmit a tone from the submarine back to the shore when the main drive battery is going low unit could be made to monitor lipo batterys problem with monitoring lipos is that you have to monitor each cell as no matter how good the pack is there is always one cell weaker than the rest, and if you take the weakest cell down to 2.85 volts and then go below this the cell will start to lose capacity every time you got below 2.85v but the circuit could also be used to monitor lead acid battery or what ever you have in your boat. The RF side of the unit the transmitter would be the size of a half pence piece and it would be fully tuneable within the FM radio band and would be all SMD components on PCB would be interested to hear your comments on this. I have done alot of messing about with lipo cells in model planes one of my pattern ships is pulling 3.4kw which is a lot of power.
John Robinson
John Robinson
Sat Oct 12, 2024 3:52 pm by geofrancis
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