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Viking PA-2A Technical Practice page 7

Paging amplifier loud ringer

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All tones require a minimum of 180ms of ringing voltage (or contact closure) to trigger. Once triggered, the electronic war-
ble will run continuously until ringing stops (or contacts open). All other tones (double gong, quadruple chime, doorbell) will
run through their full sequence once and will not cycle again until the ringing stops (or contact opens) for at least 50ms and
a second ring signal (or contact closure) triggers them again.
A. Electronic Warble (Traditional Loud Ringer)
Duration of Contact Closure
On
Off
B. Double Gong (Two "Gong" Tones)
0.74
sec
On
Off
575 Hz
C. Quadruple Chime (Four Descending Chime Tones)
0.36
sec
On
888 Hz
Off
D. Door Chime (Ding-Dong)
0.36
sec
On
Off
794 Hz
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When interfacing the PA-2A to a paging port, the TALK BATTERY switch (DIP switch 4) must be OFF. The PA-2A will
amplify all signals sent from the paging port.
When interfacing with an unused telephone line input (trunk port), the TALK BATTERY switch (DIP switch 4) must be ON
and the PA-2A must be connected to an unused trunk port. Simply access that trunk port and talk into the handset to page.
A page alert tone may be enabled or disabled with DIP switch 3. When the page alert tone is enabled, paging will interrupt
and hold off loud ringing for the duration of the page.
In both instances, the PA-2A can monitor 1 - 6 C.O. lines, 1 - 6 analog PABX/KSU stations or a dry contact closure for loud
ringing. The PA-2A will produce the selected ringing tone when ring voltage is detected on these line inputs or a contact is
closed on pins 3 and 4. Select the electronic warble tone (traditional loud ringing) for noisy areas. The softer chime tones
work well in less noisy environments.
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Frequency alternates between 1440 Hz and 1140 Hz 20 times per second.
2.2 sec
575 Hz
2.2 sec
0.36
0.36
sec
sec
699 Hz
584 Hz
492 Hz
2.7
sec
526 Hz
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