General Conclusions -I

Horns and QON likely to have gain <30 dBi and dynamic range is very important
Some method of mechnical boresighting is mandatory in order to check electrical axes wrt mechanical axis (Used at NPL)
Necessary to measure angular position of beam to significantly better than colocation requirement
Low losses in FSS difficult to measure (+/- 0.2 dB) so use radiometric methods instead

Horns and QON likely to have gain <30 dBi and dynamic range is very important