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Channelmaster 2.4m C-band antenna
The image below shows the C band feed horn, polariser for circular polarisation and two transmit reject filters apparently in series between the side 4 GHz flange on the OMT and the input to the LNB. A 6 GHz heliax coax cable connects the transmitter output signal to the 6 GHz end port of the OMT.
Grease is recommended for the threads of the four stainless steel screws that retain the two little hoop straps that retain the transmitter
to the yokes upside down underneath the arm. The rotary orientation of the whole feed assembly is of no consequence for circular
polarisation.
Channelmaster 2.4m C-band antenna
The transmitter is connected directly to the OMT, thus minimising losses at the 6 GHz frequency. On receive, the short protective transmit
reject filter is in the side arm between the OMT side flange (4GHz) and the input to the LNB.
In both of the above images there are two ways of assembling the polarizer to the OMT. The unit may transmit RHPC and receive LHCP or vice versa according to two alternative positions of the polarizer and OMT, at 90 deg to each other.
Go to www.constellationetcorp.com web site for more information.
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The content and images on this page are partly based on information provided by Constellation Networks Corporation and are reproduced with their permission. The images of the dish construction and installations were provided by photographer Dick Elleray, to whom many thanks. The images are copyright AfriConnect © 2004 All rights reserved.
RHCP means right handed circular polarisation.
LHPC means left handed circular polarisation.
OMT means ortho-mode tranducer, which splits two orthoganal linear polarisations into two waveguides.
LNB means low noise block downconverter (receives 4GHz band, outputs L band)
Read about how to set up circular polarisation.
This satsig.net web site : Page - Started 18 Nov 2004, last amended 13 March 2024 |