Like to use for receive and transmit a offset TV antenna. Read several articles about a feed for receiving and transmitting via this single dish. Read carefully the description from Bamatech, ( #28 above) I made the decision to use the Bamatech Duoband feed LNB. Install the Duoband feed to the dish and carried out the first measurement.
The result has been frustrating to me, realy poor signals. After that i have to learn, a lense will be neccessary for a better result. Ok, i order a Vento EXL - T Rocket Twin LNB remove the lense, but this lense don´t fitt. Ordered the original lense from Bamatech and this fitt mechanical perfect to the feed. Made a first test with this lense.
Looks better, but not realy good. Connect the transmit cable and carry out first QSOs with this combination. The received signals don´t come out of the noiselevel and i have not been happy with the result. On the other hand my transmit signal with this duofeed is quit ok.
So for some QSOs i use the websdr from Goonhilly for it. Finally a install again the GM 201 LNB and compare the result with the Bamatech feed.
This signal level is quit ok and i´m happy with that but for transmitting i have to find out a solution. One possibility is to use a second dish and fitt for transmitting the Duofeed there. I study more lecture about the problem anf found a solution here:
https://rfantennas.wordpress.com/ this shows what will be neccessary to fitt the Duo feed in the correct position for a offset dish.
You must cut the feedarm and contruct a new feedholder, which is movable in Z and X axis to get maximal signalstrenght.
So if you like to use the Bamatech Duoband Feed for a offset dish you must carefully study this and other articles. Also in the Bamatech description (see #28) there should be a footnote placed about this problems. Allready in (#32) i ask who has fitt a Bamatech Duofeed in the normal feed of a offset dish and is 100% happy with it. Together with the lense Bamatech send me the followig drawing.
Also for this picture there should be a footnote
This lense looks different to the lense i received from Bamatech
What i will do further to overcome my problem? From the AO 40 time i still have a Winkler parabol dish 60 CM.
Will fit the Duofeed there and find out how is the result in this configuration. In a dish like this, it is only neccessary to move the direction of the feed in one level to find the maximum signal strenght. The results i will later present here.
73 Joachim