Metal Cone Test Results
The following test took place here in Annapolis, MD, Long 76.5 W Lat 39 N at 1500 EDT on a clear day viewing SES-2 with no obstructions.
First, I sited the LNB as perfectly as I could using using an Adjustable Sliding bevel to set elevation.
The obtuse angle of 133.5 degrees is my elevation of 43.5 deg plus 90 deg to get a precise site of SES-2.
First test was done with an unshielded LNB.
resulting in SNRs of -13 to -12 dB with Signal Lock:
Second test was done with metal cone loosely fit over the LNB
resulting in SNRs of -8 to -9 dB with Signal Lock:
This is a significant improvement of 3 to 5 dB in SNR. The actual cone is made of card stock with aluminum foil glued to it, then raped around a standard bar size drink mixer so that the foil is on the inside.
Cone size is 7 inches high, with top opening of 4 inches and LNB opening of 2.5 inches. Cone weighs 1 oz. Ken