Gary wrote:
...snip...
> When you need to share a single radial system and a single high support on
> both bands, it is possible to feed two inverted-L's at a common feedpoint,
> as long as the vertical wires of the two antennas are separated by enough
> distance to reduce coupling to manageable level -- 24 inches works fine.
> The top wires should be pulled out in different directions.
Jerry, Gary,
I use such a system but with a grounded shunt fed tower and two separate
shunts. However, I had to incorporate a vaccuum relay on the 160M hat wire.
My two 'hats' are 180 degrees apart (one north and one south). The 160M hat
wire worked fine right out of the gate. But on 80M, that wire caused all sorts
of matching problems. The relay eliminated the problem. I run up to about 1KW
using an RJ1 relay with no problems. However, as a summer storm approaches, I
hear the unconnected hat wire arching--the repeated snapping increases in
frequency with the longer wire floating. Perhaps a choke would be in order to
pass the static DC back to the grounded tower.
Ford-N0FP
ford@cmgat.com
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