
AIMA-FT5S
Product User Manual
Pacific Broadband Networks
18 July 2014
Page 41 of 62
6.3.5 Configuration of Module RF Signal
Default Configuration - AGC ON
The FT5S
module’s default signal setting is for 77 channels (NTSC) at 75 dBμV per channel.
If the operator sets, the module to AGC mode when the level changes within a range of ± 3 dB the
FT5S can still work properly.
Typical environments:
77 channels (NTSC), Broadcast input: 75 dBµV per channel
Narrowcast input: 75 dBµV per channel;
The factory default settings (
DO NOT
change the values when AGC is ON):
Broadcast MGC Value: 0
OMI offset: 0
Narrowcast MGC: 0
Custom
– AGC OFF
If the input signal is ± 3 dB beyond the range of 75 dBuV, set the AGC mode to off and configure the
module with the following formula according to the input signal.
The narrowcast channel configuration method is the same as the broadcast method. Use the
broadcast channel as an example; the derivation is as below:
1. If BC input signal level is 75 dBµV, the number of channels is N.
2. The adjustment level is:
△
P=75 +
△
S
3. Set the BC MGC value to
△
P, since the range of the MGC is -10 dB to +5 dB, if the value
exceeds the range, the
OMI offset should be changed (Range: ±3 dB).
4. Please refer to the table below for setting the corresponding values of
△
S=:
Channels
100
90
77
60
50
40
30
△
S
-1.1
-0.6
0
1
1.8
2.8
4.0
Configuration Parameters Instruction
Items
Parameters
Description
Configuration
Broadcast MGC
Broadcast
Gain Control
Broadcast Gain
Control
-10 ~ +5 dB
OMI offset
OMI Offset
Change Factory
Default OMI Value
based on individual
needs
Narrowcast MGC
Narrowcast
Gain Switch
Narrowcast Gain
Control
-15 ~ 0 dB