Interresting solution of feed holder.
GFK ?
LNB looks like OCTAGON. Still with the original rill feed (for offset dish) ? Maybe not ideal for 0,4 f/D
Normally a KU-Band LNB for a prime focus antenna looks this way:
The groove feed is used to bundle the received signals from the antenna again and "forward" them directly to the LNB. Without the groove feed, reception in the C-band is hardly possible. While the groove feed is suitable for Prime Focus antennas, a funnel groove feed should be used for an offset antenna. Not only do these look similar to a funnel, but they also behave in the same way on offset antennas.
Yes ...
feed for prime focus dish
feed for offset dish
so, with your LNB with feed for offset dish underilluminate the pf dish, you have a loss from some dB ...
73´s de Robert
Try using a POTY without the lens, or with one of the shorter lenses designed for low F/D.
