Alpha Communications® Amplifiers/Power Supplies/Accessories

Amplifiers/Power Supplies/Accessories

The NH209TT is used with the HT2009/2 series S.T.R. handsets, primarily for use in apartment house intercoms, but can be used for small home and office intercoms.

The Alpha Communications®/S.T.R.™ NH209TT amplifier/power supplies are used with the S.T.R.™ HT2009 series 2-wire apartment handset stations to provide intercom amplification and power to operate the electric door opener(s) etc. The NH209TT 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 model NH209TT is a p.c. board type unit, with built-in speaker and microphone, and is made to be installed right onto the the back of the speaker grille on the standard S.T.R.™ type lobby panels. Connections are positive screw terminal type. The NH209TT can only be used on single entrance systems.

NH209TT

FEATURES
• Easily Installs Behind Grille in S.T.R.™ type Panels
• Operates on Safe Low-Voltage Class II Wiring
• Clear Voice Fidelity with Adjustable Voice Volume Control
• Convenient Screw Terminal Connections

SPECIFICATIONS

Dimensions:
Height: 5.250" (133mm)
Width: 2.375" (60mm)
Depth: 1.500" (38mm)

Volume Control: Adjustable potentiometers built-in.
Connections: Screw Terminal Connectors.

ARCHITECTS' AND ENGINEERS' SPECIFICATIONS
The power supply/amplifier shall be Alpha Communications®/S.T.R.™ model NH209TT, or
approved equal. Amplifier 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 install behind the
speaker/microphone grille on the S.T.R.™ panel(s). Power supply/amplifier shall provide the
intercom amplification and signaling power for proper system operation. Power supply/
amplifier shall be installed a safe distance from any source of electrical interference.

REQUIRED COMPONENTS
DZ209/5

---AND/OR--- Diode Board Adaptors (installed behind the lobby panel, wires to the push-buttons).

DZ209/10

OPTIONAL COMPONENTS
DO-001 (or equivalent) 16VAC Door Release.
PK407A Specialty Relay Adaptor. Used when connecting a door opener
other than a 16VAC type to system. One (1) required for each
building entry door opener.

WIRING REQUIREMENTS:
Apartment riser wiring shall be 1-common #22AWG and 1 selective
wire #22AWG, for each handset station connected to the riser
cable. Add 1-#22AWG common wire if there are optional apartment
pushbuttons which will also have to signal apartment handset,
when visitor is at apartment door (and when using optional R1
pulsating buzzer adaptor). See wiring diagram AWD019
for more complete wiring information.