11
The TRANSMIT GROUND keying line connector
MUST
be connected to a
grounded-
on-transmit
transceiver keying line, cable shield to radio chassis ground, and the RADIO
connector must be connected to the transceiver RF connector, cable shield to radio chassis
ground, to enable receive mode.
Positive voltage keying will not key the
DXE-RTR-1A
properly.
Damage to the
DXE-RTR-1A
could occur by attempting to use positive voltage keying.
Review your transceiver operation manual carefully. Transceivers with positive keying
only, must be connected to an interface buffer to provide grounding-on-transmit keying.
Receiving Antenna Spacing Guidelines
The overall benefits that receiving antenna offer is less noise. Weak signals can be heard on a
dedicated receive antenna because it rejects noise and strong stations by virtue of its design, size,
directivity and lower sensitivity.
Therefore, placement of a receiving antenna is very important. Normally, excellent results are
achieved by placing a receive antenna in a low noise environment. If possible, receive antennas
should be located at least 1/2-wavelength away from noise sources and noise re-radiating antennas.
Houses, other metal or structures containing metal, metal fencing, towers and transmitting antennas
can introduce noise into a receive antenna by proximity which may reduce the effectiveness of a
receive antenna.
However, in many cases, the physical space required for the ideal receive antenna installation is not
available to the average back yard. The following diagrams (1-7) of typical and special system
configurations show absolute minimum spacing between transmitting and DX Engineering Active
Receive Antennas. For optimal performance, greater spacing is recommended for better reception
results.
Diagram 8
shows phasing of a mono-band or multi-band vertical antenna using a
DXE-ARAV3-1P
Active Receive Vertical Antenna with the
DXE-NCC-1
Receive Antenna Phasing Controller. The
spacing described is 1/4 to 1/2-wavelength between the transmit antenna and the Active Receive
Antenna. This distance is based on optimal performance of the equipment described.
For in-depth receiving antenna system information, please consult the
ARRL Antenna Book
or
ON4UN's Low Band DXing
book.
Typical System Configurations
In most cases, the operator will purchase the
DXE-RTR-1A
because they want to use a receive
antenna on a transceiver which lacks a receive antenna input. See the text below and use Diagram
1B for an example using the
DXE-RTR-1A
with a transceiver having a Receive Input and Output.
All transceivers under 200 watts output may be connected to the
DXE-RTR-1A
as is shown in
Diagram 1A
, and all other
Diagrams 2
through
9
, even if it has a receive antenna input.
Diagram 1A
illustrates the positions and connections to a standard transceiver for optional receive
enhancement products from DX Engineering. A simple Beverage antenna or receiving loop antenna
