AIMA-FT5S
Product User Manual
Pacific Broadband Networks
18 July 2014
Page 42 of 62
6.4 Setup using separate BC and NC RF input in MGC mode
Since no QAM RF signals are used in sample calculation 1 or 2, this setup will use sample calculation
3. For the exact RF calculation, please refer to Chapter 6.1.1 sample calculation 3.
Sample calculation 3 details:
Total RF power
50 channels analog
= 50 analog equivalent
13 x QAM @ -10 dB
= 1.3 analog equivalent
15 x QAM256 @ -6 dB = 3.8 analog equivalent
------------------------------------------------------------------------------------------------- +
Totals 55.1 analog equivalent channels
6.4.1 RF transmitter setup using both BC and NC RF input
Option 1
Connect Broadcast analog RF load to the BC port of the transmitter at a level of 16.6 dBmV (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. Apply 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.