User Manual

ADCP-75-179 • Preliminary Issue A • September 2004 • Section 3: Operation

Page 3-17

2.9 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:

1. Click on the HOST RF tab. The HOST RF display will open within the EMS main

window as shown in Figure 3-14.

2. Click on the Host Fwd Delay field Edit button (see Figure 3-14). The Host Fwd Delay

pop-up screen will open as shown in Figure 3-15.

3. Obtain the value of the forward delay as specified in the system design plan. The delay is

adjustable in 0.1 µsec steps.

4. Enter the forward path delay value and click OK to close the pop-up screen and to make

the changes take effect.

5. Repeat the process for reverse delay by right-clicking on the appropriate delay section (see

Figure 3-14) and then entering the required delay value in the pop-up screen.

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

Table 3-3. 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