AIMA-FT5S
Product User Manual
Pacific Broadband Networks
18 July 2014
Page 44 of 62
6.5.1 RF transmitter setup using both BC and NC RF input
Option 1
Connect Broadcast RF load to the BC port of the transmitter at a level of 16.6 dBmV ± 3 dB (50 x
analog) See sample calculation for calculated RF input level (chapter 6.1.1. Sample 3)
Broadcast port setup
1.
Set “
Input AGC Mode
” to OFF and click "
Submit
" to apply the setting
2. Set field
“
Broadcast MGC
” to 0 and click "
Submit
" to apply the setting
3. Apply the Channel load of the 50 channels analog RF load with a level of 16.6 dBmV to the
transmitter.
4. Click "
Apply
" to store setting at the transmitter
Narrow cast port setup
1. Connect the QAM RF load to the NC input of the transmitter.
2. Apply The RF level of the QAM RF load to the NC port at 16.6 dBmV
3. With equal RF input at the transmitter at the BC and NC port, the transmitter will automatically
introduce a backoff of 0 dB. Set the Narrowcast MGC to -6 dB to create the 6 dB RF backoff
between BC RF lead and NC RF load.
4.
Click the "
Apply
" button to store transmitter settings.
Enabling AGC mode
1.
Set “
Input AGC mode
” from OFF to ON
2.
Click "
Apply
" to store the settings to the transmitter.
Note: When applying the Analog RF at 16.6 dBmV, at this RF level, the AGC circuit will operate
exactly in the middle of the AGC dynamic range. This means that RF variations of 16.6 dBmV +3 dB
or -3 dB will be compensated.