CPI TR40 Kullanım Kılavuzu - Sayfa 4

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level on the scope. Readjust R39 slightly to further reduce signal level. Recheck R38 then R39. Notch will be
approximately 58 dB deep.
Microphone Sensitivity - R75 controls the microphone audio level into the transmit compression circuit and
therefore acts as a sensitivity control. This potentiometer has been factory set to provide adequate compression for
normal voice audio with a relatively quiet background noise level.

Jumper Settings

The TR series circuit board has 9 "Dot" jumpers. These jumpers are "in" if there is a solder short across it and
"out" if there is not. Table 1 lists the jumpers by number and explains their function. Factory settings are underlined.
Table 1

Dip Switch Settings

Table 2 describes the functions provided by the dip switch on the bottom of the unit. The factory setting are
JP#
For 2 wire operation.
1
For 4 Wire or FD operation.
2
For 2 wire operation.
3
For FD operation.
4
For FD operation.
5
Normal boom/panel mic gain.
6
Three to ten frequency models.
7
Three to ten frequency models.
8
Three to ten frequency models.
9
underlined.
Table 2
Switch #
1
2
TR 10 (Does not affect TR30 or TR40)
3
4
5
Allows volume to be turned down
6
TR20, TR30 or TR40 - SPKR always ON
7
Locks up function tone (0 dBm)
8
Disables tone attenuation (All tones at +10
4
IN
ON
600 ohm termination
TR30 or TR40
TR20
completely.
dBM)
OUT
For 4 Wire or FD operation.
For 2 wire operation.
For 4 Wire or FD operation.
For Non-FD operation.
For Non-FD operation.
Increased boom/panel mic gain.
One and two frequency models.
One and two frequency models.
One and two frequency models.
OFF
5000 ohm termination
TR20 (Does not affect TR30 or TR40)
TR10 or TR20
TR10, TR30 or TR40
Prevents volume from being turned down
completely.
TR10 - SPKR mute with handset off-hook
Normal operation
Normal operation