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The
RCA8B-1
uses a removable five terminal plug as shown in
Figure 5
. The
RCA8B-1
connections are labeled “
G A B C D
”. The terminals use the same connection letters and are
connected G to G, A to A, B to B, C to C and D to D.
On the
RCA8B-1
the green connector is a two part connector as shown in
Figure 5
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 removable connector back in place, ensure you press straight inward to
fully seat the connection.
Figure 5 - RCA8B-1 Green Connector
NOTE: Since no voltage is required on the feedlines of mono-band passive vertical
elements, do not connect a voltage source to the “D” terminal on the RCA8B-1
connector.
Switch Position
G
A
B
C
D
1
GND
0
0
0
1
2
GND
1
0
0
1
3
GND
0
1
0
1
4
GND
1
1
0
1
5
GND
0
0
1
1
6
GND
1
0
1
1
7
GND
0
1
1
1
8
GND
1
1
1
1
Table 1 - Modified DXE-CC-8A Output Truth Table
Control lines (usually BCD ) can normally use good quality CAT5e cable (4 twisted pairs of 24
AWG wire) for runs up to 1000 feet. Typical DX Engineering BCD control lines requirements are
+12 VDC at 25 milliamps.
Depending on the number of control lines needed (usually 3 or 4) you can double up the twisted
pairs of CAT5e cable, or use control wire that is at least 22 AWG, allowing runs up to 1500 feet. If
you use a cable with more conductors, it is a good idea to tie the unused conductors to ground.
