Amplifier - NH908A
General Information

The NH908A is used with the HT2006 series S.T.R. handsets for handset to handset communication, when there is no door remote station involved.
The Alpha Communications NH908A amplifier/power supplies are used with the S.T.R. HT2006 series handset stations, for handset to handset communication only, without any door remote stations. It can also be used with the TW202 series visitor intercom systems. It provides intercom amplification and power to signal the electric buzzers in the HT2006 handsets. The NH908A operates on 16VAC (30VA) low-voltage Class II wiring. For permanent transformer mounting use our Model #SS106 (U.L. Listed) transformer. For plug-in transformer connection use our Model #SS146 (U.L. Listed) transformer. The NH908A amplifier/power supply is a compact P.C. board type, with self-stick mounting tabs and mounting holes for surface wall or other types of mounting. Connections are positive screw terminal type, using a barrier type terminal connector strip.
Easily Installs Right on Finished Wall Surface or in Customer Supplied HousingOperates on Safe Low-Voltage Class II WiringConvenient Barrier Type Screw Terminal Connections

Height: 3.50″ (89mm)
Width: 3.50″ (89mm)
Depth: 0.75″ (20mm) from mounting surface

Connections: Barrier Type Screw Terminal Connectors.

Architects’ and Engineers’ Specifications

The power supply/amplifier shall be Alpha Communications model
NH908A, or approved equal. Power supply shall operate from a
16VAC (30VA) U.L. Listed transformer (SS106 or SS146). All wiring
to power supply/amplifier shall be low-voltage Class II wiring,
installed as per all federal, state, and local electrical codes.
Power supply/amplifier shall surface mount right to the finished
wall and shall be installed in a suitable environment that is free
from excessive dirt, dust, temperature, humidity, grease and water.
Power supply/amplifier shall provide the intercom amplification and
signaling power for proper system operation. For most secure
installation, power supply should be installed into a lockable
equipment cabinet/housing. Power supply/amplifier shall be
installed a safe distance from any source of electrical interference.
Optional Components

PK407A Specialty Relay Adaptor. Used when an individual
HT2006 selective call button is needed to trigger
another signaling application other than an electric
buzzer signal. One (1) required for each signaling
application (per HT2006 button).
DV4 4-Zone Paging Adaptor. Used in addition to all other
system components, when paging from one or more
handsets is required. Has 10W of audio output split
between 1-4 zones. Output of DV4 can be sent into
one or more public address amplifiers for larger paging
requirements. Each DV4 requires its own SS146 (40VA)

Amplifier – NH908A
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