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.