Nat PTA12-300 - Adjustments and Connections

i*lnat
PTAI2-300
POTS Telephone Adapter with NVIS
Display
SM55-3
lnstallation
and Operation
Manual
2.4.4.2
Power On
Ghecks
Notes: 1 . PTA12-300
functionality is highly dependant on the airborne telephone system interface.
Check
proper
operation of the telephone transceiver, and check that
the
transceiver has
an activated
telephone line.
2.
Where the PTAI2-300 is connected to an
existing audio
system, check that the PTAI2-300
is
properly
selected when
performing
audio checks.
Power
up the
aircraft's systems and confirm
normal
operation of all
functions
of
the PTA12-300.
Refer to
Section
3
(Operation)
for
specific operational
details.
a) lnitiate a callto a valid
telephone
number
and
verify the operation
for
HOOK, HOLD, DTMF
keys
(0
-
9,
*,
#) and VOL. Re-initiate the call using REDIAL.
Test the FLASH function
(where
applicable)while in
the off-hook state
(active).
b) Place the PTA12-300 in the on-hook
(inactive)
state, and have another
party
call the line
connected to the PTA12.
Confirm
proper
RINGER, HOOK and HOLD operation.
c)
To
verify
proper
operation, all functions and levels
shall
be checked in-flight.
Upon
satisfactory completion
of all
performance
checks, make all required log book entries, electrical
load,
weight
and balance amendments and other documentation as required by
your
local regulatory
agency before releasing
the aircraft for service.
2.5
Adjustments
and Connections
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The following
adjustments
are accessible
through holes in the
side
of the unit shown in Figure 1
Rotating the trimpots
cw
will increase the level of the related output and
ccw
will decrease it.
lnternal
Trimpot Adiustments
LTS adjusts keypad backlighting levelfrom min to max
DTMF adjusts DTMF level on POTS interface
S/T adjusts sidetone
level
Ð( adjusts receive level on
phones
output
MIC adjusts mic levelon POTS interface
RGR
adjusts
ringer level
on
both ringer audio and
phones
output
lnternal
Switch Settinos
RGR on
[down]
(ringer
select)
off
[up]
ringer audio
available on both
phones
and
ringer audio outputs
ringer audio
only
available on
ringer
audio
output
flash
=
90
ms
+40
ms
flash
=
600 ms
+100
ms
mic bias supplied
by PTA12
mic
bias
not supplied
FLA / FLB
(hook
flash)
Mtc
(mic
bias)
select
FLA
select FLB
on
[down]
off
lupl
Figure
1:Adjustments
Section 2 Rev: 1.01
lssue 4 Page 2-3
ENG-FORM: 805-0121.DOT
CONFIDENTIAL
AND PROPRIETARY TO NORTHERN AIRBORNE
TECHNOLOGY
LTD.
The document reference is online, please check the correspondence between the online documentation and the printed version.