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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receive input level and the specified receive output level. Set to
IN the proper combination of front-panel RX LEVEL switches
that add up to the required amount of gain or loss. (paragraphs
3.14 and 3.15)
6.)
If equalization is desired in the transmit channel, refer to the CLR
card for the specified 1000Hz and 3000Hz receive input signal
levels at the distant (receive channel) location. Determine the
type of cable that the module interfaces, and perform the
appropriate equalization procedure, as described below.
(paragraph 3.16)
Loaded cable and predominately loaded mixed cable
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 (nearest but lower) amount of equalized gain.
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 (nearest but lower) amount of equalized gain.
Predominately nonloaded mixed 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 (nearest but lower) amount of equalized gain.
7.)
Note: The amount of equalized gain added in step 6 must be
added to the specified 1000Hz transmit input level to obtain an
equalized transmit input level.
If the equalized transmit input level is lower than the specified
transmit output level, gain must be added. If it is higher, loss must
be added. Set front panel TX GAIN/LOSS switch to either GAIN
or LOSS, as required. To determine the required amount of gain
or loss, calculate the difference (in dB) between the equalized
transmit input level and the specified transmit output level. Set to
IN the proper combination of front-panel TX LEVEL switches
that add up to the required amount of gain or loss. (paragraphs
3.17 and 3.18)
8.)
Insert the module into its mounting, apply power, and proceed to
the final alignment (with equalization) procedure (Figure 9).
Figure 9. Final alignment procedure –with equalization
1.)
Connect a properly terminated TMS (receive) to the RX IN MON
jack and insert an opening plug into the RX IN jack. Request that
personnel at the distant facility-side location send 1000Hz and
3000Hz tones at their specified level. Verify that tone is present
and record these levels. (paragraph 3.20)
2.)
If receive equalization was determined in the preliminary
alignment procedure, omit this step and proceed to step 3. If not,
determine the type of cable that the module interfaces and, with
the measured levels from step 1, perform the appropriate
equalization procedure as described below. (paragraph 3.13)
Loaded cable and predominantly loaded mixed cable
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 (nearest but lower) amount of equalized gain.
Nonloaded cable
Determine the difference (in dB) between the 1000Hz and
3000Hz signal levels. Subtract 1.5dB from this difference,
referring to Table 2, set front panel RX EQL switch for the
required (nearest but lower) amount of equalized gain.
Predominately nonloaded mixed 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 (nearest but lower) amount of equalized gain.
3.)
Disconnect the TMS and remove the opening plug. Connect the
properly terminated TMS (receive) to the RX OUT jack. Request
that the distant location again send 1000Hz tone at their specified
level. Verify that tone is present and record the level. (paragraph
3.20)
4.)
Determine the difference (in dB) between the measured 1000Hz
receive output level (step 3) and the 1000Hz output level specified
on the CLR. If any difference in levels exist, insert or remove
gain via the front-panel RX LEVEL switches to obtain the
specified receive output level. (paragraph 3.20)
5.)
To complete receive-channel verification, perform a frequency
run, measuring and recording levels at appropriate intervals from
300 to 3000Hz. If the measured levels meet the desired
frequency-response characteristics, the equalizer is properly set.
6.)
Disconnect the TMS. Connect the properly terminated TMS
(transmit) to the TX IN jack and send 1000Hz and 3000Hz tones
at the specified level. Request that personnel at the distant
facility-side (receive) location measure and record the level of
each tone. (paragraph 3.21)
7.)
If the transmit equalization was determined in the preliminary
alignment procedure, omit this step and proceed to step 8. If not
determine the type of cable that the module interfaces and, with
the measured levels from step 6, perform the appropriate
equalization procedure as described below. (paragraph 3.16)
Loaded cable and predominately loaded mixed cable
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 (nearest but lower) amount of equalized gain.
Nonloaded cable
Determine the difference (in dB) between the 1000Hz and
3000Hz signal levels. Subtract 1.5dB from this difference
and, refereeing to table 2, set front panel TX EQL switch for
the required (nearest but lower) amount of equalized gain.
Predominately nonloaded mixed 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 (nearest but lower) amount of equalized gain
8.)
Again send 1000Hz tone at the specified level. Request that
personnel at the distant facility-side (receive) location measured
and recorded the 1000Hz level. (paragraph 3.21)
9.)
Determine the difference (in dB) between the distant facility-side
(receive) location’s specified 1000Hz input level and the level
measured in step 8. If any differences in levels exist, insert or
remove gain via the front-panel TX LEVEL switches to obtain the
required level. (paragraph 3.21)
10.)
To complete transmit-channel verification, perform a frequency
run, measuring and recording levels at appropriate intervals from
300 to 3000Hz. If the measured levels meet the desired
frequency-response characteristics, the equalizer is properly set.
11.)
Remove all test connections. Alignment is completed.