Quote:
Originally Posted by Battle_axe
welll there will without a doubt be a resistor to alter the gain of the loop antenna what else i dont know not allot else as the decoder does the signal prosessing i think
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The resistor for the loop gain goes mid point in the loop. On the orignal AMB supplied loops its potted in a "black box". The loop its self can be made easily.
The interface box on the end of the co-ax is more difficult... I believe its an impedance matching transformer amonst other bits inside. It means that the signal voltage is stepped up so that the co-ax is running at a higher level than the the loop to improve signal/noise ratio and reduce rogue transponder pick-ups from the co-ax.