2
VCIR-CFL
S8
S4
S1
S8
S4
S1
S8
S4
S1
S8
S4
S1
Right Channel Jumper
Left Channel Jumper
Left Channel Jumper Positions
Right Channel Jumper Positions
L+ L–
R–
R+
L+ L– R– R+
IN
PU
T
O U T P U T
®
VCIR
SPEAKER VOLUME CONTROL
WITH IR RECEIVER
SYLMAR, CA
™
Fig. 2
Jumper Placement For Impedance Matching
SPECIFICATIONS – IR RECEIVER SECTION
•
Infrared carrier frequency bandwidth
: 36 kHz to 42 kHz.
•
IR reception range
: Up to 60 feet on axis (range may be more or less depending on device being
controlled and levels of IR or EM interference).
•
Reception angle
: Approx. 50% range reduction @
±
45
°
off axis horizontally.
•
Cable requirements
: When running long lengths use:
4-conductor/24 gauge solid or stranded wire up to 200', 22 gauge up to 600', 20 gauge up to 2000' and
18 gauge up to 5000' (unshielded OK).
•
Maximum cable length
: One mile with 18 gauge.
•
4-Terminal Block
(with double sided tape for mounting) included for easy extension of 18" ribbon lead.
See
Fig. 6
for lead identifications.
•
Red talkback LED
: Tests system for correct wiring and indicates IR reception.
•
Green system ON/OFF status LED
: (draws 10 mA @ 12 VDC).
• SUN780 Sunscreen filters available separately. Order these to help with sunlight and stray IR problems.
They fit easily over rear of photodiode opening.
• IR receiver works in normal 3-wire mode with 4th lead for Status.
•
NOTE:
Unit will not work in Phantom mode!
• Use Xantech Connecting Blocks for connection to emitters.
•
Power requirements
: 12 Volts DC
±
2 V @ 20 mA.
• Up to 10 VCIR-CFL's may be powered by one 781RG power supply.
SETTING THE IMPEDANCE MATCHING JUMPERS
Fig. 2
shows the location of the pins and the jumper locations on the pins for the three impedance multiplier
positions. To set the jumpers correctly, refer to
Fig. 2
and the charts and procedures that follow.
The jumpers are located under the one side of the autoformers as shown in
Fig.2
. Their proper placement
depends on the number of VCIR's and speakers used in the total installation. To set them for the best
impedance matching condition, refer to the charts and procedures that follow.
