there are two types of LNBs tested here. OCTAGON OTLSO which has two indepedend LOs and Rocket LNBs VENTON and Red Eagle. Both work with 7,5 Volts. The Rockets can be combined now even with a patch or a helix.
Reducing the diameter of the LNB-Waveguide and increasing the copper tube a bit it can be sticked together smoothly. I prefer SMA-Connectors to feed the S-Band-Antennas to avoid mechanical collision with the LNBs and the mounting clamp. That's why the backplane of the helix shows a corner connector. At the front of the tubes is a small ring of brass to fix the lense again.
With the lenses I always expected more gain. It was'nt seen clearly. Looking to a wide spectrum, the difference between transponder noise and background increases. Probably the background noise gathering beside the dish goes dowwn with a smaller radiation pattern?
This is a wide spectrum without the lense.
Here is the same spectrum using the rocket lense. The reduced background noise can be seen in the waterfall also.
Looking to the Datasheet of the TFF1017 the question appeared, woud it be possible to modify the loop filter. The result could be improved phase noise of the LOs.
Of cours it is a very theoretical question and the transponder noise can be seen clearly above the LNBs noise even with a "normal" dish and the lense. SMD components are fare away from easy changing and experiments. But, may be....