273 Branchport Avenue
Long Branch, N.J. 07740
(732) 222-6880
INSTALLATION INSTRUCTIONS
MODEL TPA-20/TPA-35
PAGING AMPLIFIER
GENERAL DESCRIPTION:
WARNING: ANY MATERIAL EXTRAPOLATED FROM THIS DOCUMENT OR FROM WHEELOCK MANUALS OR OTHER DOCUMENTS DESCRIBING THE
PRODUCT FOR USE IN PROMOTIONAL OR ADVERTISING CLAIMS, OR FOR ANY OTHER USE, INCLUDING DESCRIPTION OF THE PRODUCT'S APPLICATION,
OPERATION, INSTALLATION AND TESTING IS USED AT THE SOLE RISK OF THE USER AND WHEELOCK WILL NOT HAVE ANY LIABILITY FOR SUCH USE.
Wheelock's models TPA-20 and TPA-35 paging amplifiers are rated at 20 watts and 35 watts, respectively.
These amplifiers can accommodate three different inputs: a low-impedance microphone input (both balanced or unbalanced), a transformer isolated 600
ohm telephone input and a high-impedance music input. The background music will automatically be muted whenever a page is generated.
The amplifiers feature individual tamper resistant volume controls, tone control, a low-cut horn-protect switch and two LED's: power on and peak level
indicators.
Both models operate from 120V, 60Hz and have a power consumption of 59 watts (TPA-20) and 112 watts (TPA-35). A circuit breaker, enclosed in the
power transformer, protects the unit against excessive AC current which could cause damage to internal components. The circuit breaker is self-
resettable, however, in the event it does not reset, have the trouble investigated by an authorized service technician or return unit to the factory.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK.DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.
INSTALLATION:
Unpacking
The amplifier was carefully checked before leaving the factory. Inspect shipping container and unit carefully for indication of improper handling. If the
unit has been damaged, make an immediate claim to the carrier.
Mounting
The amplifiers are designed for either shelf or wall mounting. For surface wall mounting, use the 2 keyhole slots in the chassis base, and the mounting
template on page 5.
Power Grounding
The 120 VAC line cord has a three-prong plug which should be plugged into a three wire grounded electric outlet. It is very important to maintain the
amplifier grounded for safe and trouble-free operation. If there is no grounded electric outlet, connect a wire from the GND terminal of the unit to a water
or steam pipe.
POWER CORD:
CAUTION
:
To prevent electric shock do not use this (polarized) plug with an extension cord, receptacle or other outlet unless the blades can be fully
inserted to prevent blade exposure/Attention: pour prevenir les chocs electriques ne pas utiliser cette fiche polarisee avec un prolongateur, une prise de
courant ou une autre sortie de courant, sauf si les lames peuvent etre inserees a fond sans en laisser aucune partie a decouvert.
TECHNICAL SPECIFICATION:
#
Parameters
TPA-20
TPA-35
1.
2.
3.
Power Output @ 1 KHz
Total Harmonic Distortion
Outputs
20 Watts Rms
Less Than 2% THD
20W @ 8 Ohms 12.5V 25V & 70V
--------
35 Watts Rms
Less Than 2% THD
35W @ 8 Ohms 12.5V 25V & 70V
Inputs
Telephone
Mic
Music
4.
5.
6.
7.
8.
Impedance
Sensitivity
Frequency Response
Signal To Noise Ratio
Type Of Input
600 Ohms
-20dBM
Shaped For Maximum
61dB
XFRMR Isolated/Bal.
LO-Z
1mV
Intelligibility
55dB
Balanced Or Unbal.
HI-Z
220mV
90Hz-14kHz
75dB
Unbalanced
9.
10.
11.
Controls
Indicators
Protection
Page Output Volume, Music, MIC And Tel Input Level, Tone, Lo-Cut Switch
Green LED - Power On, Red LED - Peak Level *
AC Automatic Resettable Therm. Breaker & Therm. Overload Protection On Output
12.
13.
14.
15.
16.
Tone Control Operation
Lo-Cut Switch Operation
Automatic Limiter/Paging
Automatic Mute Operation
Regulation
-9dB @ 12KHz
-6dB @ 250 Hz
±
1dB Output Level Maintained Without Clipping, Even While Exceeding Rated Input Level Up To 40dB Minimum.
40dB Muting At any Output Level
No Load To Full Load Output Less Than 2dB.
17.
Additional Features
Ability To Double Output Power Into A 25V Line, RFI Protection And Shelf Mount Or Wall Mount.
18.
19.
20.
Consumption
Size
Weight
0.49A, 59W
11-1/2"W X 4-3/8"H X 7 1/4"D
(29.2 X 11.1 X 18.4 cm)
6lbs. 2 oz. (2.78kg)
--------
0.93A, 112W
11-1/2"W X 4-3/8"H X 7-1/2"D
(29.2 x 11.1 X 19.1 cm)
8lbs. 6 oz. (3.8kg)
*
If TPA-35 is subjected to a continuous tone signal input for more than four minutes at full rated output, then the current limiting circuit may be activated. In that case,
the unit will shut off and then automatically reset.
Copyright 1989, 1990, 1991, 1993, 1994 Wheelock, Inc. All rights reserved.
P81782 G
Sheet 1 of 4
I
NPUT CONNECTIONS:
(
See Figure 1
.)