5
the shield ground wire is used for the GND connection. The feedline shield can also be used for the
ground path if the shield is attached to the GND on the
CC-8A
and to the station ground.
Note: The total loop resistance of the control cable path must be under 30 ohms for
reliable operation.
The brightness for the front panel indicator LED’s is fully adjustable by the potentiometer on the
rear panel. Select the relay control voltage before adjusting LED Brightness.
The DC Input requires 12 Vdc (nominal). One 2.1 mm power cable is included.
An optional wall transformer is available from DX Engineering that supplies 12 Vdc @ 1 amp.
Optional DXE-PSW-12D1A
AC A12 Volt DC, 1000 mA
Wall Transformer
Control lines 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.
For longer runs of control cable, use a line loss calculator to ensure you supply the proper control
levels needed.
Approximate BCD Control Line Lengths (can use this also for 1 of 8 control wires).
Minimum Copper Wire
Gage (AWG)
Length
24
1,000 feet
22
1,500 feet
20
2,000 feet
