Viking CPA-7B Application Note

APPLICATION
APPLICATION
T
T
E L E
E L E
Model CPA-7B
The transformer at the amplifier is referred to as the step-up trans-
former; the transformer at the speaker is referred to as the step down
transformer.
P h o n
P h o n
h t t p :
h t t p :
I n s t a l l a t i o
I n s t a l l a t i o

A. Step Up Transformer

1. Connecting the Audio Output

At the amplifier, connect the 8 OHM AUDIO OUTPUT to the 8 OHM
and COM taps of the step-up transformer's secondary coil as shown.
See chart below for pin selections.
Model Pins
CPA-7B 1 & 2
M15W
1 & 4
PA-2A
9 & 10

2. Selecting the Coil Tap

Select the step-up tranformer's primary coil tap, which closest
matches the amplifier's rated wattage output and connect
these taps to the beginning of the long wire run (see the chart
to the right).
S
S
C O M O L U T I O N S
C O M O L U T I O N S
Minimize the Loss of Audio in
Long Speaker Runs
It is possible to install long speaker runs
with the CPA-7B, M15W and PA-2A.
To minimize the loss of audio power in long
speaker runs, a transformer is required at
both the amplifier end and at the speaker
end of a long wire run. A minimum of two
transformers are always required (Parts
Express 1-800-338-0531, part # 300-040).
e . . . 7 1 5 . 3 8 6 . 8 8 6
e . . . 7 1 5 . 3 8 6 . 8 8 6
/ / w w w . v i k i n g e l e c
/ / w w w . v i k i n g e l e c
n
n
N
N
2 1 C
2 1 C
F O R T H E S T
F O R T H E S T
1
1
t r o n i c s . c o m
t r o n i c s . c o m
Parts Express part # 300-040
(or equivalent)
Long Wire Run
Step-Down Step-Up
Transformer Transformer
Long Speaker Runs
with the CPA-7B,
o t e
o t e
M15W and PA-2A
August 29, 2005
E N T U R Y
E N T U R Y
VIKING
MODEL PA-2A
©
PAGING
VOLUME
VIKING
ELECTRONICS
HUDSON, WI 54016
MIN MAX
PAGING - LOUD RINGING
AMPLIFIER SYSTEM
1 2 3 4
TALK BATTERY
ALERT TONE
WARBLE / CHIME
RINGING LINES
1 - 3 4 - 6 1 2 3 4
8 OHM
COM
Model Wattage
CPA-7B
6
M15W
15
PA-2A 2
Model PA-2A
Model M15W
RINGING
VOLUME
MIN MAX
5 6 7 8 9 10
POWER JP1
Tap
5
10
2.5