Crown Audio IQ-RPT - Manual (Page 6)

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IQ-RPT Crown Bus Signal Repeater
Page 6
2 Installation
The installation of an IQ Repeater can be divided into
two parts: power connection and Crown Bus connection.
2.1 Power Connection
The IQ Repeater operates in one of two power settings.
The 115 VAC setting is for operation from 100 to 120
VAC. Operation from 220 to 240 VAC uses the 230 VAC
setting. The Repeater is factory set to the correct setting
for the country to which it is shipped. Simply plug the
correct power cord into the Repeater and an appropriate
electrical outlet. Should the Repeater require a different
power setting than the factory setting, contact qualified
service personnel.
2.2 Connecting the Crown Bus
IQ Repeaters are recommended at every point the Crown
Bus exceeds 1,000 feet (305 meters). However, loops
in excess of 2,000 feet (610 meters) are possible without
the use of a Repeater. The stringent characteristic
determining mazimum bus length is loop capacitance.
Each loop should have less than 40 nanofarads of
capacitance. Adding IQ Repeaters divides the bus loop
into sections, each of which can then have 40 nanofarads
of capacitance. (see Fig. 2.1.). When calculating bus
capacitance, use the capacitance-per-foot rating of the
loop wire and add 60 picofarads per IQ component.
There are several connectors used for Crown Bus wiring,
IQ INTERFACE
CR
O
WN B
U
S
IQ REPEATER
IQ REPEATER
IQ REPEATER
IQ REPEATER
1,000 FEET
40 NANOF
AR
ODS MAX
1,000 FEET
40 NANOF
AR
ODS MAX
1,000 FEET
40 NANOF
AR
ODS MAX
1,000 FEET
40 NANOF
AR
ODS MAX
1,000 FEET
40 NANOFARODS MAX
Fig. 2.1 A 5,000-foot Crown Bus Loop.
1 Input (–)
2 Input (+)
3 GND
4 Not used
5 Not used
IQ–P.I.P. Input
2
5
3
4
1
Optional Shield
Output (–) 1
Output (+) 2
Not used 3
Not used 4
IQ–INT II Output
2 3
4 1
OUT IN
+ – + –
Output (+)
Output (–)
Input (+)
Input (–)
GND
Output (–) 1
Output (+) 2
Not used 3
Not used 4
IQ Mixer IQ–INT II Output
2 3
4 1
Optional Shield
1 Input (–)
2 Input (+)
3 GND
4 Not used
5 Not used
Output (+)
Output (–)
Input (+)
Input (–)
IQ Mixer IQ–INT II Input
2
5
3
4
1
Optional Shield
OUT IN
+ – + –
Fig. 2.2 Connecting Bus Loop, DIN to DIN.
Fig. 2.3 Connecting Bus Loop, DIN to
4-Pin Eurostyle Removable Barrier Block.
Fig. 2.4 Connecting Bus Loop, 4-Pin
Eurostyle Removable Barrier Block to DIN.
including DIN connectors and other bare wire connectors.
The IQ Repeater uses a 5-pin DIN for input and a 4-pin
DIN for the output. See Fig. 2.2 to connect IQ components
with DIN Connectors. Figure 2.3 and 2.4 illustrate how
to connect IQ components with DIN and barrier block
connectors.