Peripheral Electronics IS77 - Manual (Page 5)

3
PURI Gain Adjustment
1) The PURI is designed to install Inline with the radio antenna connection usually located
on the back of the radio in the dash. In some cases this connection may be at a remote
radio tuner location. Consult vehicle manufacturer’s information in these cases.
2) Some antenna connections require the use of an antenna adapter in order to connect to
the PURI. These adapters are available from most car audio installation retailers.
3) Select the FM frequency where you will access your new audio device. On the side of
PURI where the label indicates “Tuning Frequency” there is a two position switch. Note
the position of the switch before installing the interface.
If you have a local radio station that occupies either of these frequencies (87.9 or 88.3)
please move the switch to the position that does NOT match the local station.
The position of this switch determines the frequency where you will access your new audio
input. We recommend choosing one option, and setting one of the radio’s preset buttons
to represent that station. This easily accesses your auxiliary audio input by pressing the
preset button.
Using a Multimeter, identify 12V+ and Ground wires behind the radio.
a. Connect the PURI Red wire to 12V+ (Ignition)
b. Connect the PURI Black wire to Ground
c. Connect the vehicle’s antenna into the PURI antenna input*
d. Connect the PURI antenna output into the radio*
*A vehicle specific antenna adaptor may be required to make these connections
The rocker switch supplied with the PURI will turn the device on and off. When the switch
is in the on position, the PURI will interrupt the incoming antenna signal to deliver the
cleanest signal possible from your device through your FM radio. To regain standard FM
reception, move the switch to the Off position.
4) Once the PURI is installed correctly, be sure to properly set the audio level. When set
correctly, the audio level of the PURI will match the volume of typical FM radio stations.
PURI
Universal Radio Input
Stereo Audio to FM Radio
A udio Input 
° L
° R
Power 12V DC °
Ground ° 
Antenna Input °
Antenna Output °
Tuning Frequency ( MHz FM)
 87.9 88.3
Radio Tuning Frequency
Use to select best operating
frequency for your area
Audio Input
Left & Right
Antenna Out
to FM radio*
Antenna Input
from vehicle antenna*
Ground Connection
Connect to a clean ground point
Factory or Upgraded Radio*
On/Off Switch
3/4” mounting hole
Connects to Power Source
ACC 12VDC
Power when key-on
2A Fuse
TOP VIEW
Gain Adjustment
Use to match volume of PURI
to volume of FM radio stations
BACK VIEW
H L
LEVEL
+