[TowerTalk] Combining antennas
Bill Tippett
btippett at alum.mit.edu
Tue Feb 3 20:15:56 EST 2004
KE3Q wrote:
>Bill (W4ZV) and others, my recollection of W3LPL's presentations on
stacking, at the Dayton Antenna Forum and elsewhere, was that the stack was
always equal or better than any individual antenna. I think this was for
two-stacks, like 50/100' on 20, 45/90' on 15 and 35/70' on 10, and the
parameter may have included from Maryland to Europe, not sure about that
one. What's your experience?
Rich, I found the lowest (35' of 35'/70'/105' stack) was often
better than any other combination late in the European opening.
You can see that here:
http://users.vnet.net/btippett/terrain_&_toa's.htm (second graph)
For takeoff angles of 13 degrees and higher, the bottom antenna
alone was better than any other combination. I also found that the
bottom antenna was the quietest and allowed me to copy stations
that were not readable on the 35'/70' combination or the 70' alone.
KC1XX has a single 8 element at 35' for the same reason
I suspect. "Eight-element W1JR yagi at 10 meters on 20M tower, fixed
Northeast."
http://www.kc1xx.com/antennas/antennas.htm (scroll to 10 meters)
73, Bill W4ZV
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