ACCURATE ELECTRONICS INC
Practice Section 104003C Rev A January 2014
PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008 BEAVERTON OR USA 503.641.0118 FAX 503.646.3903
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5
Note:
If the 3000Hz signal level is not specified on the CLR card, gain and
equalization cannot be determined at this time. Omit paragraphs 3.13
through 3.18 and proceed to paragraph 3.19. Gain and equalization will be
determined in the final alignment verification procedures, beginning with
paragraph 3.20.
RECEIVE-CHANNEL EQUALIZATION
3.13
Refer to the CLR card for the specified 1000Hz and 3000Hz receive
input signal levels. If it is desirable to flatten the frequency response of the
facility, determine the type of cable the module interfaces and proceed as
follows:
A.
Loaded cable or mixed (predominately loaded) cable:
If the
module interfaces loaded cable or mixed loaded and nonloaded
cable and the
loaded
cable section is predominant (i.e., up to 9
kilofeet of nonloaded cable), the facility can be partially equalized
with the equalized gain provided by the module. Determine the
difference (in dB) between the 1000Hz and 3000Hz signal levels.
Divide this difference by
2
and, referring to table 2, set front panel
RX EQL switch for the required amount of equalized gain. If the
exact
amount cannot be selected, use the nearest
lower
value to
avoid over-equalization.
This setting flattens the response
between 1000Hz and 3000Hz by adding 1000Hz gain equal to the
amount of equalized gain selected and 3000Hz gain equal to two
times the amount of equalized gain selected. When calculating
receive-channel levels (paragraph 3.14), the amount of equalized
gain selected above must be added to the specified receive input
level to obtain an equalized receive input level.
B.
Nonloaded cable:
If the module interfaces nonloaded cable,
determine the difference (in dB) between the 1000Hz and 3000Hz
signal levels. Subtract 1.5dB
from this difference and, referring
to table 2, set front panel RX EQL switch for the required amount
of equalized gain. If the
exact
amount cannot be selected, use the
nearest
lower
value to avoid over-equalization.
This setting
flattens the response between 1000Hz and 3000Hz by adding
1000Hz gain equal to the amount of equalized gain selected and
3000Hz gain equal to two times the amount of equalized gain
selected. When calculating receive-channel levels (paragraph
3.14), the amount of equalized gain selected above must be added
to the specified receive input level to obtain an equalized receive
input level.
C.
Mixed (predominantly nonloaded) cable:
If the module
interfaces mixed nonloaded and loaded cable and the
nonloaded
cable section is predominant (i.e., 9 kilofeet or more of nonloaded
cable), determine the difference (in dB) between the 1000Hz and
3000Hz signal levels. Subtract 2dB from this difference and,
referring to table 2, set front panel RX EQL switch for the
required amount of equalized gain. If the
exact
amount cannot be
selected, use the nearest
lower
value to avoid over-equalization.
This setting flattens the response between 1000Hz and 3000Hz by
adding 1000Hz gain equal to the amount of equalized gain
selected and 3000Hz gain equal to two times the amount of
equalized gain selected. When calculating receive-channel levels
(paragraph 3.14), the amount of equalized gain selected above
must be added to the specified receive input level to obtain and
equalized receive input level.
RECEIVE-CHANNEL LEVELS
3.14
Refer to the CLR card for the specified 1000Hz receive input and
receive output signal levels. If equalized gain was inserted in the receive
channel (paragraph 3.13), add the amount of equalized gain used to the
specified receive input level to obtain an equalized receive input level.
Calculate the difference (in dB) between the equalized receive input level (or
the specified receive input level if equalization was not used) and the
specified receive output level to determine how much gain or loss must be
added to achieve the specified receive output level.
3.15
Set front panel RX GAIN/LOSS switch to introduce either gain or loss
into the receive channel, as required. Set to the IN position the proper
combination of front-panel RX LEVEL switches that adds up to the required
amount of gain or loss.
TRANSMIT-CHANNEL EQUALIZATION
3.16
Refer to the CLR card for the specified 1000Hz and 3000Hz signal
levels at the distant (receive-channel) location. If it is desirable to flatten the
frequency response of the facility, determine the type of cable the module
interfaces and proceed as follows:
A.
Loaded cable or mixed (predominately loaded) cable:
If the
module interfaces loaded cable or mixed loaded and nonloaded
cable and the
loaded
cable section is predominant (i.e., up to 9
kilofeet of nonloaded cable), the facility can be partially equalized
with the equalized gain provided by the module. Determine the
difference (in dB) between the 1000Hz and 3000Hz signal levels.
Divide this difference by 2 and, referring to table 2, set front panel
TX EQL switch for the required amount of equalized gain. If the
exact
amount cannot be selected, use the nearest
lower
value to
avoid over-equalization.
This setting flattens the response
between 1000Hz and 3000Hz by adding 1000Hz gain equal to the
amount of equalized gain selected and 3000Hz gain equal to two
times the amount of equalized gain selected. When calculating
transmit-channels levels (paragraph 3.17) the amount of
equalized gain selected above must be added to the specified
transmit input level to obtain an equalized transmit input level.
B.
Nonloaded cable:
If the module interfaces nonloaded cable,
determine the difference (in dB) between the 1000Hz and 3000Hz
signal levels. Subtract 1.5dB from this difference and, referring to
table 2, set front panel TX EQL switch for the required amount of
equalized gain. If the
exact
amount cannot be selected, use the
nearest
lower
value to avoid over-equalization.
This setting
flattens the response between 1000Hz and 3000Hz by adding
1000Hz gain equal to the amount of equalized gain selected and
3000Hz gain equal to two times the amount of equalized gain
selected. When calculating transmit-channel levels (paragraph
3.17), the amount of equalized gain selected above must be added
to the specified transmit input level to obtain an equalized
transmit input level.
C.
Mixed (predominately nonloaded) cable:
If the module
interfaces mixed nonloaded and loaded cable and the
nonloaded
cable section is predominant (i.e., 9 kilofeet or more of nonloaded
cable), determine the difference (in dB) between the 1000Hz and
3000Hz signal levels. Subtract 2dB from this difference and,
referring to table 2, set front panel TX EQL switch for the required
amount of equalized gain. If the
exact
amount cannot be selected,
use the nearest
lower
value to avoid over-equalization.
This
setting flattens the response between 1000Hz and 3000Hz by
adding 1000Hz gain equal to the amount of equalized gain
selected and 3000Hz gain equal to two times the amount of
equalized gain selected. When calculating transmit-channel
levels (paragraph 3.17), the amount of equalized gain selected
above must be added to the specified transmit input level to obtain
an equalized transmit input level.
TRANSMIT-CHANNEL LEVELS
3.17
Refer to the CLR card for the specified 1000Hz transmit input and
transmit output signal levels. If equalized gain was inserted in the transmit
channel (paragraph 3.16), add the amount of equalized gain used to the
specified transmit input level to obtain an equalized transmit input level.
Calculate the difference (in dB) between the equalized transmit input level
(or the specified transmit input level if equalization was not used) and the
specified transmit output level to determine how much gain or loss must be
added to achieve the specified transmit output level.
3.18
Set front panel TX GAIN/LOSS switch to introduce either gain or loss
into the transmit channel, as required. Set to IN the proper combination of
front panel TX LEVEL switches that add up to the required amount of gain
or loss.