Topband: DC bias tee question

Tom W8JI w8ji at
Wed May 21 21:47:46 EDT 2014

> I've been looking at the Shared Apex Loop, and one thing I am puzzled by 
> (among many) is that the bias tee/DC coupler circuit has both sides of 
> the 75-ohm feed coming in from the antenna and the DC supplied to the 
> coupler totally isolated from ground, while the ground side of the coax 
> going to the receiver is connected to ground.  Having recently been 
> totally defeated in building a bias tee of my own for receive antenna 
> switching, I wonder if maybe this is a subtlety of the design that had 
> escaped me.

That makes no difference in function.

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