Re: ATU for mBITX

n5ib_2
 

The bias tee isn't used to power the T1, since it has internal battery power, and, with latching relays, only draws power when tuning.
The bias tee, using a lithium coin cell for DC power, fires an optical isolator at the antenna end that triggers the remote control line on the T1.

So the only connection between the Tx and the T1 is the coax.

N5IB

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