2 – Functional Description & Setup
Intraplex VF-40 Voice Module
Version 1.11
GatesAir
2-13
Intraplex Products
Table 2-7. Remote Configuration Settings (P Codes) (continued)
P
Code
Settings
7 6 5 4 3 2 1 0
Value*
Description
P10
B
0
↑
0
↑
0
↑
0
↑
0
↑
0
↑
0
↑
0
↑
0 – 255
Adjusts the output level for Channel 3
CH.3 RX LEVEL
P11
B
0
↑
0
↑
0
↑
0
↑
0
↑
0
↑
0
↑
0
↑
0 – 255
Adjusts the input level for Channel 4
CH.4 TX LEVEL
P12
B
0
↑
0
↑
0
↑
0
↑
0
↑
0
↑
0
↑
0
↑
0 – 255
Adjusts the output level for Channel 4
CH.4 RX LEVEL
* These values are the only legal ones for setting the parameters. Setting any parameter to a value
outside its specified range produces an unpredictable result.
2.7.1.1 Input and Output Level Adjustments
Each channel on the VF-40 module has nominal input and output levels determined by the switch
settings on the module (Table 2-3). The factory standard setting is 0 dBm input, 0 dBm output for all
channels, with the option of -16 dBm input, +7 dBm output.
Eight electronic level controls allow the input and output levels for each channel to be adjusted in <0.5
dB increments. These adjustments must be made by the remote port using P codes P3 through P10.
Each of these P codes can have a decimal value of 0 through 255. A value of 0 is the factory default
setting; when the P code is 0, the actual level is within ±0.5 dB of the nominal. Increasing the value
toward 255 increases the gain and decreasing the value toward 0 decreases the gain. When the VF-40
module is placed into local mode (Remote switch off), all eight level controls reset to the factory
default value of 0.
Figures 2-6 and 2-7 show the effect of changing the P code setting. Note that on the transmit input,
increasing the gain means that a lower input signal level can be accommodated, while on the receive
output, increasing the gain means that a higher output level is provided. Tables 2-7 and 2-8 convert
each P Code to an equivalent decibel value.
Warning!
Do not adjust the level controls to provide input and output levels beyond the maximums
specified for the VF-40 module:
Input -16 dBm to +3 dBm
Output -10 dBm to +10 dBm
Settings outside this range may overdrive the input and output amplifiers.
