Rev. 2 - 06/07
KBS3-4 Coax Camera to
Digital Video Converter Unit
The Alpha Communications®/S.T.R.™ KBS3-4 coax
camera to digital video converter unit is used only with
the S.T.R.™ 4-wire QwikBUS™ series video-inter-
com systems, when a customer wishes to use their
own separate CCTV camera and camera power sup-
ply. The KBS3-4 is used to convert the video data
signal from customer's camera's conventional NTSC
coax signal, to a digital signal to be sent to the 4-wire
QwikBUS™ video monitor(s).
The KBS3-4 gets its power from the TT33 speaker/
microphone module and does not require a separate
Each camera connected to the QwikBUS™ series
video-intercom system, requires its own separate
power supply (provided by the installer).
• Easily Installs Right on Finished Wall Surface or in
Optional Junction Box
• Operates on Safe Low-Voltage Class II Wiring
• Compact size allows mounting inside many lobby entry
Height: 3.40" (87mm)
Width: 3.40" (87mm)
1.85" (47mm) from mounting
Construction: High impact protective ABS plastic case
0-50 degrees C.
Surface-mounted (usually installed near
the system amplifier/power supply and
other system central equipment).
ARCHITECTS' AND ENGINEERS'
The coax camera to digital video converter unit(s)
shall be Alpha Communications®/S.T.R.™ model
KBS3-4, or approved equal. The KBS3-4 shall be
built into a protective high impact ABS plastic case,
for surface mounting. The KBS3-4 shall be pow-
ered by the TT33 speaker/microphone assembly,
when not using a standard S.T.R.™ QwikBUS™,
with the provided wiring harnesses.
One KBS3-4 shall be required for each customer
provided camera that contractor will connect to the
Alpha Communications®/S.T.R.™ 4-wire Qwik-
BUS™ video-intercom system, other than a stan-
dard S.T.R.™ QwikBUS™ type.
Low voltage wiring shall be used. The KBS3-4 shall
be mountable right to the surface of the wall or in