7
Site Selection
Site selection is important. The
DXE-RFS-SYS-4P
system can be positioned as close as 1/10
wavelength to transmitting antennas. The
DXE-ARAV3
Active Elements are bypassed to ground
when power is turned off. A programmable sequencer, such as the
DXE-TVSU-1B
is required, and
included with the
DXE-RFS-SYS-4P
, for close spacing requirements.
Significant pattern distortion or coupling may result from close spacing. To prevent pattern
degradation, reception of re-radiated electrical noise or other interference, separation of 1/2
wavelength (at the lowest operating frequency) is ideal. See
Figure 1
. The goal is to do the best you
can by balancing all the factors.
1/10 wavelength is the
minimum
distance to any transmitting antenna
from the Four Square perimeter, greater than 1/2 wavelength is the
minimum distance that will limit coupling to other antennas and the
introduction of broadband re-radiated noise and signals.
Figure 1 - Site Selection Clear Distance
Proximity to Transmitting Antennas
The
DXE-ARAV3-4P
active elements and your transmitting antenna need only minimal physical
separation to maintain safe power levels when the
DXE-TVSU-1B
sequencer is used. With 1500
watts output and a unity gain (0 dB) antenna, the closest active element can be 1/10 wavelength
from the transmitting antenna at the lowest transmitting frequency. Doubling the protection distance
quadruples safe power levels. See
Table 1
.
