ACCURATE ELECTRONICS 104003C Посібник - Сторінка 5

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ACCURATE ELECTRONICS INC

WWW.ACCURATE.ORG

PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008

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:

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.

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.

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.

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.

Mixed (predominantly nonloaded) cable:

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

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This setting flattens the response

This setting

If the module

Practice Section 104003C Rev A

BEAVERTON OR USA 503.641.0118

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:

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.

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.

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.

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.

Mixed (predominately nonloaded) cable:

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.

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.

January 2014

FAX 503.646.3903

This setting flattens the response

When calculating transmit-channel

This setting

If the module