ZETRON 025-9581M, Руководство по установке и обслуживанию

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Setting Levels in the Model 620x
The audio level sent to those connectors is controlled by the pot R87. Initially this control
is set to its mid-range position, and it may turn out that no further adjustment is required
once the FFSK receive level is set. If you do need to adjust the audio level going to the PA
amplifier use the following procedure. You will need to have the following:
• The Model 6203 unit open and a small screwdriver or alignment tool suitable for
adjusting R87
• If you intend to set the audio to a specific level specified by the PA amplifier
manual, the required meter or test equipment to read the signal level at J3-pin 9 and
J3-pin11.
• Some means of communicating with the dispatcher at the Model 26 location to co-
ordinate the sending of test announcements (a slow 10-count or something like that)
to your station
♦
Adjusting the voice audio level to the PA input:
1. When you are prepared to make the adjustment, call the dispatch center and have
the operator send a station alert with PA to the station you are working on.
2. Once the alert tones are over and the voice audio is being sent to the PA (whatever
you arrange for as a test message, you can use the PA ON mode instead of an
actual alert), adjust R87 as necessary to get the voice audio in the correct range.
Repeat this step as necessary to get the level correct.
3. Remove any test equipment and close up the station transponder.
Note Turning the pot R87 fully counterclockwise will mute the PA audio.
Note If the Model 6203 has a handset installed, the final audio level to
the handset ear piece can be set with the pot R64. This setting
should be made after the PA audio level has been set using R87.