On 24 Mar 2004 17:51:31 -0800, (Art Unwin KB9MZ)
wrote:

"aunwin" wrote in message news:ln06c.30814 to the

COMPUTOR COMPARISONS

Note additional column at end for comparison:

ROTATABLE LOOP/DIPOLE VERT LOOP/DIPOLE BEVERAGE KB7QHC Vertical

10 DEG -13 -5 -9 +4.66 dBi

20 DEG -8 -3 -7 +4.21 dBi

30 DEG -5 -3.3 -6.5 +3.44 dBi

40 DEG -2.4 -4 -8 +2.29 dBi

50 DEG -1.8 -6 -13 +0.68 dBi

60 DEG -0.8 -8 -30

70 DEG -0.6 -11

80 DEG -0.0 -15

90 DEG -0.0

NOTE OUTSIDE CURVE = ZERO
0dB = 2.15dBi Frequency 1.9 MHz

All above perfect ground
Rotatable dipole @ 65 feet
Vert Dipole 2 feet above ground
Beverage 10 feet above ground
Note that Beverage has beam pattern with good f/b
Dipoles basically circular pattern and good for transmit and receive

ART UNWIN KB9MZ

Hi Art,

I don't see to much to crow about. What point were you trying to
illustrate? You don't really describe the antennas very well, but it
doesn't seem to matter much given the numbers above. It does
illustrate how extremely poor dipoles do at 160M. A simple vertical
seems to be considerably more effective than the three antennas you
offer. By my comparisons up to 50 degrees, the KB7QHC Vertical has at
LEAST 2.4 dB more gain than ANY of the three; at a more interesting
angle of 10 degrees, the vertical shows an easy gain of +9 to +17 dB.

As for being on topic, what has this got to do with Q?

73's
Richard Clark, KB7QHC