AMERITRON RCS-10, Instruction Manual

Page: 10 / 16

Ameritron RCS-10 Instruction Manual
8
+Vdc
A
1 4
B
2
5 7
C
3 6 8
AMERITRON
116 WILLOW ROAD
STARKVILLE, MS 39759
MADE IN U.S.A.
Figure 2
The RCS-10 is internally fused with a standard auto-glass (3AG) style 1-ampere fuse. If
your power supply is capable of supplying significantly more than one ampere, you
should also fuse the power lead at the power supply with a low-current fuse. Installing a
fuse at the power supply eliminates safety hazards associated with overheated power
leads, if the leads should become shorted.
Terminals A, B, and C are BCD encoded outputs for the relay unit. Terminal “A” is BCD
1, terminal “B” BCD 2, and terminal “C” is BCD 4. This provides a numerical total of
zero through seven for selecting relays. Antenna port one on the relay box is selected with
all BCD outputs zero, port 2 with only BCD “A” high, and so on until port eight is
selected with all BCD ports high.
When antenna position one is selected, voltage on A, B and C is zero volts. This is the
same voltage as when the control head power is turned off. Because of that, antenna port
1 is selected whenever the switch is off or has no power.
There is an internal 2-pin jumper on the left side (rear view) of the front-panel printed
circuit board. When these pins are NOT jumpered, the LED’s are dim. When these pins
are jumped, the LED’s are brighter. When using voltages over 20 volts, you must be sure
these pins are not jumped.