-15-
RFI REDUCTION AND RFI CHOKE INSTALLATION
The following steps are recommended when installing, to help reduce RFI:
1. Make sure that both the control head and amp are securely attached to good
chassis ground (i.e. no paint in-between the chassis and the grounding
terminal).
2. Keep the siren control head and amplifier as far away from the police radio as
is practical.
3. Check that the police radio antenna wire makes a right angle from the back of
the police radio and runs on one side of the vehicle. The communications
cable for the siren should make a right angle out of the back of the control
head and exit in the opposite direction from both the police radio antenna wire
and the police radio power wires.
4. Excess communication cable from the control head to the amp should be
tightly bound back near the amplifier box.
5. One of the RFI chokes (STAR P/N: P30039-57) should be placed around the
communications cable at the back of the siren amplifier box.
6. The second RFI choke should be placed around the Red and Black wires exiting
the siren amplifier box.
SIREN CONTROL
HEAD
RADIO
BATTERY
RADIO POWER WIRES
ANTENNA LEAD
SIREN COMMUNICATIONS CABLE
RFI
CHOKES
SIREN
AMP
Minimum 3'
SIREN POWER AND GROUND WIRES
2-WAY
RADIO
AMP
(Electrical Connections CONT’D)
