16
For Example
: An array with 90 foot side spacing, the diagonal length is 127.3 feet. The 0.95
factored physical length for DLY3 electrical length is 120.9 ft. Multiply 120.9 ft.
by 0.85 (the VF of DX Engineering 75 Ω coaxial cable).
The correct physical length for DLY3 is 102.77 feet, or 102 feet 9 inches.
Delay lines DLY1 and DLY2 must be half the length of DLY3
. Make DLY1 and DLY2 as close
to half the physical length of DLY3 as possible. To avoid performance degradation due to
inconsistent coaxial cable construction, all the delay line coaxial cable should be cut from the same
spool.
Delay line cables can be neatly coiled in a 1-1/2 ft diameter coil. Support the weight of the cables
by taping or securing them to the support pole or mast rather than allowing them to hang from the
connectors.
It is important to use 75 Ω feedline to the operating position from the
DXE-RFS-2
. Do not use
amplifiers, combiners, filters or splitters that are not optimized for 75 Ω systems.
Control and Power Connections
If you have the
DXE-RFS-SYS-4P
system, with the
DXE-EC-4
Control Console, no other
equipment is needed for powering the
DXE-RFS-SYS-4P
, the active elements or controlling the
receive direction of the
DXE-RFS-SYS-4P
. The
DXE-RFS-SYS-4P
has been factory-set to work
with the
DXE-EC-4
using four conductor control cable such as
COM-CW4
.
J12
is the 5-terminal connector plug on the front panel of the
DXE-RFS-2
. It is labeled
G A B C G
.
The
DXE-RFS-2
uses a two part green connector and the top part can be removed by pulling it
straight off. This will allow easier wire replacement or servicing as needed. When pushing the
connector back in place, ensure you press straight inward.
