Table of Contents
RX1 Modulated Input
Nov 2023
Introduction
It has been quite some number of years since I dealt with Modulators and Receivers, so I did struggle a little with this recently, these are some notes of the values I used, just to get a Mod/Demod setup going.
Hardware Connections
See below for the connection method between the AVP and the RX1.
The Monitor F-Type output of the AVP is connected directly to the RF input of the RX1 (RX4 is on the left). There is no up-convertor or attenuator in use.
AVP Output Parameters
Below is the output settings I used on the AVP Modulator.
Output Parameters
RF Carrier ID State On (don't confuse this with Modulation on) Output Select L-Band Output State On Reduced Power (we don't want to overload the RX1 input) Output Power-up State (Last State)
L-Band Output
Frequency Input Mode L-Band Frequency L-Band Frequency 1070 MHz Reduced L-Band Line-up Power -5 Nominal L-Band Power -10 L-Band Spectrum Sense Inverted L-Band Tilt 0 L-Band Up-converter Frequency 2500 MHz Upconverter Power Off Upconverter Reference Of
The settings on this page determine what frequency you are transmitting on.
AVP Modulation Parameters
Below is the Modulation settings I used on the AVP Modulator.
Modulation Standard DVB-S2 Modulation State On Modulation 8PSK FEC Rate 3/4 Frame Size Normal Pilots Off NCR Stamping PID 8191 Symbol Mapping Mode Mean Power PL Scrambling Sequence Number 0 Symbol Rate 31.25 Roll-off Factor 20% Bandwidth 37.5 Mhz (Auto Calculated from the above modulation settings)
The settings on this page determine the amount of bandwidth that is available, in this case it is 37.5 Mhz.
RX1 Input Settings
See Below for the RX1 Demodulation settings.
Input Type Satellite Source RF4 (in this example) LNB LNB Frequency 5150 LNB Voltage (voltage off) this is because we don't actually have an LNB in our system. 22kHz not selected, same reason as above. Tuner Frequency 4080 (5150-4080=1070. 1070 is the L-Band Freq we set in the AVP) Symbol Rate 31.25 Search Range 10000 C/N margin alarm 2.0 Everything else off.
RX1 Input Status
On the same page as you entered the RX1 demodulation settings, once you have started the receiver service, you should see the following input status.
