Service manual

Telex Communications

Gain Setup for Output Port

Gain is simply the increase of a signal accomplished by increasing the size of the amplitude. AZedit uses Unity Gain.

Unity Gain is when the amplitude that the audio comes into the matrix system is sent out at the same amplitude. For

example, if +10 dB comes into the matrix that is set with 0 gain, then +10 dB will leave the matrix. However, if +10 dB

comes into the matrix that is set with –4 dB gain, then +6dB will leave the matrix. The unity point is seen as zero dB,

by default. The minimum adjustment for gain levels in AZedit is +/-.5 dB. A negative gain is known as attenuation

There are three gain adjustments that can be manipulated from this screen:

Point-to-Point - Use point-to-point listen gain to adjust the level at which the currently selected intercom port hears a

selected other intercom port. Point-to-point listen gain is the same thing as Crosspoint Gain, and the adjustment can

be made on this screen or the Crosspoint Gain screen.

Note: When you adjust the level at which one port hears another port, keep in mind this affects all

communications between the two ports. Use the following examples using various types of

communication where port 1 is talking to port 2 follow to learn what can happen when you adjust

the gain levels:

Example 1, Point to Point: Port 1 could press a point-to-point talk key to talk to port 2. Port 2 will

hear port 1 at whatever level has been set in the Point-to-Point Listen dialog.

Example 2, Special List: Port 2 could be a member of a special list. Let's say the special list is

named CREW. Port 1 could have a key assigned to talk to special list CREW. In this case, port 2

will also hear port 1 at the level that is set in the Point-to-Point Listen dialog for port 2. Even though

port 1 is not using a point-to-point key, there is still a point-to-point relationship between port 1 and

every member of special list CREW.

Example 3, IFB: Port 2 could be specified as the output port for an IFB. Let's say the IFB is named

TAL1. Port 1 could have a key assigned to talk to IFB TAL1. In this case, port 2 will hear port 1 at

the level that is set in the Point-to-Point Listen dialog for port 2. Even though port 1 is not using a

point-to-point key, there is still a point-to-point relationship between port 1 and the output specified

by the TAL1 IFB, which is port 2. Now, let's say that port 3 also has TAL1 assigned to a key. If the

point-to-point listen setting for port 2 listening to port 3 is different than the setting for port 2

listening to port 1, the levels will sound different when port 1 or port 3 talk to port 2 using the TAL1

key.

Party Line - Use Party Line Listen Gains to adjust the level at which a specific intercom port hears a specific party

line.

Note: You can also set the party line listen gains using party line gain setup.

Analog I/O - The Analog I/O Gain setting indicates the amount by which the input level to this intercom port has been

increased or decreased from the normal 0 dB level. The Output Gain setting indicates the amount by which the output

level from this intercom port has been increased or decreased from the normal 0 dB level.

Note: You can view the current input and output gain settings for this intercom port, but you cannot

make changes in this dialog box. To make changes to these settings, close the Gain Setup dialog

box. Then, in the System menu, point to Gains, and select Analog Input/Output Gains from the pop

up menu. This will open the Analog Input / Output Gains view.

To Open the Gain Setup Output Port screen, do the following:

1. From the Keypanel/Port Main screen, click the Gain button .

The Gain Setup For Output Port screen appears.

NOTE: You can also access the Gain Setup For Output Port screen by right clicking a talk or listen

key on the Keypanel/Port main screen.