Proximity To Transmitting Antennas - DX Engineering DXE-RCA8C-SYS-2P Manual

If the noise originates in the near-field of the antenna, everything becomes unpredictable. This is a
good case for placing receiving antennas as far from noise sources (such as power lines) as possible.

Proximity to Transmitting Antennas

The ability of passive vertical element matching system components to survive high RF fields
depends on component ratings.
The DX Engineering Active Matching Units with customer supplied vertical elements, or the DXE-
ARAV4-8P Receive Antenna Active Vertical with Relay active elements and your transmitting
antenna need only minimal physical separation to maintain safe power levels when the optional
DXE-TVSU-1B Time Variable Sequencer Unit 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 3.
Band
160m (1.8 MHz)
80m (3.5 MHz)
40m (7.0 MHz)
Table 3 - Array Safety Distance Minimums at 1500 watts
Table 3 indicates minimum safe distances for the sequenced active array from transmitting antennas
with 0 dB, 3 dB and 6 dB gain (ERP) using a 1500 watt transmitter. Your actual system may vary
according to location and proximity to various objects. Your actual system may vary. Safe distance
will vary depending on operating frequency, antenna polarization and orientation, and
transmitting antenna pattern.
Unity (0 dB) Gain 3 dB Gain (2x)
55 ft
28 ft
15 ft
- 19 -
6 dB Gain (4x)
110 ft 220 ft
56 ft 112 ft
30 ft 60 ft