David Clark 9800 Series Manual de instalación descargar pdf (Pagina 40)

9532P-62 (03-11) C

ppendix C

Master Station Adjustments

Radio 1 & Radio 2 Transmit Audio Level Adjustments

Under most circumstances these adjustments have been pre-set to optimum levels and should never

need to be performed in the field. However, they are included in this section should their adjustment

be necessary.

To increase or decrease the transmit mic audio level for Radio 1, locate and adjust R161 on the

inside of the U9800S Master Station. For Radio 2, locate and adjust R179. (see Figure C1 for the

locations of these components). Turning the potentiometers clockwise will increase the levels and

counter-clockwise will decrease the levels. Use a jeweler’s screwdriver to make these adjustments.

Please note that these are single-turn potentiometers, so be careful not to force them past their stops.

It is important not to increase the levels so much as to cause distortion over the radios. Doing so will

seriously degrade the quality of the transmissions. If you have the equipment to measure the

modulation, 4-4.5 kHz is an optimum level.

Radio 1 & Radio 2 Receive Audio Level Adjustments

The factory has pre-set the receive audio adjustment

potentiometers to levels which should be

acceptable in most applications. Remember, you can adjust these levels through the Panel Display

also. Should the need arise to change these settings, the installer may do so by the following

procedure:

To increase or decrease the receive audio levels for Radio 1, locate and adjust R169 inside the

U9800S Master Station. For Radio 2, locate and adjust R184. (see Figure C1 for the locations of

these components). For these adjustments, turning the potentiometers counter-clockwise will

increase the audio levels and clockwise will decrease the audio levels.

Auxiliary Input Mute Level Adjustment

This adjustment changes the level that the auxiliary

audio will be heard in the background when either

the captain/co-captain PTT, or when one of the radios is receiving a transmission. The factory has

preset the mute level of the Auxiliary Input. However, should adjustments be necessary, they can be

achieved by locating and moving J19 and J22 to the desired positions inside the U9800S Master

Station, as shown in Figure C2. These jumpers should both always be set to the same dB position.

Auxiliary Input Mute Threshold Adjustment

This adjustment changes the audio level that must be present from Radio 1 or Radio in order to mute

the auxiliary input. To change, locate R216 inside the Master Station (see Figure C1). Turn this

tentiometer all the way clockwise to completely disable any muting from occurring. If this

potentiometer is turned all the way counter-clockwise, the auxiliary input will always be muted.

Auxiliary Input Mute Time-Out Adjustment

This adjustment changes the length of time between wh

en the auxiliary audio is muted (because of

PTT or radio reception) and when the auxiliary audio returns to full level. The factory has pre-set this

setting to about 4 seconds. To change this value, locate and adjust R242 inside the Master Station.

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David Clark 9800 Series Manual de instalación Pagina 40