3
Consult your Valcom distributor for assistance in
selecting a control unit and power supply.
Nominal Specifications for the
V-1048M
•
Input Impedance:
45 Ohm
Limitations of the V-1048M
•
Two talkback speakers maximum per zone.
•
800 feet maximum cable length to speaker
NOTE: Do not split pairs to speakers.
•
Do not use talkback in noisy areas (80dB or
greater).
Coverage of the V-1048M
The distance you can be away from a speaker and still
have good talkback depends on the type of speaker and
ambient noise level.
The speaker should be as close as possible to the area
where talkback is desired. It should not be mounted
close to, or pointed at, noise producing equipment such
as fans, air conditioners, machinery, or compressors.
The chart to the right shows maximum talkback
distances relative to the noise level of the surroundings.
Remember: The speaker is no better than
your ears. If you can not carry on a
conversation at normal voice levels over the
required talkback distance, then talkback
page equipment will not function
satisfactorily.
Cabling for the V-1048M
Connections should be accomplished using regular
twisted pair wiring. Do not split pairs.
Connections for the V-1048M
Connect station or other suitable wire to leads as
follows:
MOUNTING OF HORN
(All Models)
Attaching Speaker to Base
NOTE: For ease of installation, the base can be
attached to the speaker before or after the base is
mounted.
•
Loosen position adjustment knob.
•
Insert the ball of the base into the socket of the
speaker.
•
Tighten the position adjustment knob.
Mounting
Mount the horn to a suitable surface using the hardware
provided. These units can be mounted to a wall, a
beam or an electrical box.
•
Mount the base to a wall using the two holes
provided. Knockout holes are provided for punch
out should additional holes be desired.
•
A "C" clamp is provided with the horns to allow
mounting to a beam. Place the bolt through the
hole in the bottom of the base to secure the "C"
clamp to the beam (See Figure 1). It is suggested
that the horn be mounted to the underside of the "I"
beam to provide maximum positioning
adjustments.
•
Connection to an electrical backbox is
accomplished by channeling wire through the ball
of the base and making appropriate connections.
The base has holes punched for a double-gang
square box, but by punching out additional
knockout holes, the base can be mounted to a
single-gang or octagon box. (See Figure 2).
The horns may be rotated or moved up and down to
obtain the desired position by loosening the knob at the
bottom of the unit (see both figures) approximately 1
turn. Make required adjustments and re-tighten knob.
Machine
Shop
(Noisy)
90
80
70
60
50
10'
20'
30'
40'
50'
Shipping
(Moderate)
Waiting
Rooms
(Quiet)
Talkback not recommended above 80dB
TYPICAL REPLY DISTANCE CHART
Maximum Talkback Reply Distance
Tip (White)
Ring (Black)
Out
Common
Connections to
a V-1048M
VALCOM
HANDSFREE
TALKBACK
PAGE
CONTROL
UNIT
