How do we isolate the coax shield from the radial system? >>
I'm specifically talking about receiving systems. An
isolation transformer is cheap and easy, and since most
receiving antennas have poor grounds or no grounds, they
should never be tied into the coax shield...which would
allow common mode currents to pass. I just can't imagine why
anyone would build a receiving system where the coax can
contribute signal to the receiving antenna through a
shield-to-antenna path.
In transmitting systems elevated radials should never have a
ground path. Grounding elevated radials reduces efficiency.
If the house has a lot of noise and you receive on the
transmitting antenna you might not want to directly ground
the antenna ground system to the house. This is especially
true with a small radial system.
73 Tom
_______________________________________________
Topband mailing list
Topband@contesting.com
http://lists.contesting.com/mailman/listinfo/topband
|