User's Manual

ADCP-75-187 • Preliminary Issue 1B • November 2005 • Section 3: OPERATION

Page 3-16

Figure 3-12. Host Rev Att Pop-Up Screen

6. Enter the attenuation value that will provide the required gain. Refer to Table 3-2 for the

attenuation values and the corresponding gain (nominal) values.

7. Click OK to close the pop-up screen and to make the changes take effect.

2.7 Reference Procedure: Enter Host Forward and Reverse Delay

The forward and reverse delay function allows entry of from 0 to 63 µsec of delay in the

forward and reverse paths. This feature is used when multiple systems are used to transport the

same channel and there is a significant difference in the path delay between systems. Additional

delay may be entered to balance the overall system delay. The amount of delay required must be

calculated by the RF engineer and should be included in the system design plan. The default

setting is 0 µsec. Use the following procedure to change the forward and reverse path delay:

Table 3-2. Reverse Path Attenuation Setting and Nominal Gain Provided

ATTENUATION

SETTING

GAIN

PROVIDED

ATTENUATION

SETTING

GAIN

PROVIDED

ATTENUATION

SETTING

GAIN

PROVIDED

0 dB → 30 dB 11 dB → 19 dB 22 dB → 8 dB

1 dB 29 dB 12 dB 18 dB 23 dB 7 dB

2 dB 28 dB 13 dB 17 dB 24 dB 6 dB

3 dB 27 dB 14 dB 16 dB 25 dB 5 dB

4 dB 26 dB 15 dB 15 dB 26 dB 4 dB

5 dB 25 dB 16 dB 14 dB 27 dB 3 dB

6 dB 24 dB 17 dB 13 dB 28 dB 2 dB

7 dB 23 dB 18 dB 12 dB 29 dB 1 dB

8 dB 22 dB 19 dB 11 dB 30 dB 0 dB

9 dB 21 dB 20 dB 10 dB 31 dB –1 dB

10 dB 20 dB 21 9 dB