Randall has installed the new S-band notch filters at Yg to replace the (loaned) diplexer. Tests today measuring Tsys with the antenna pointed directly at the USN antenna while transmitting and not, and while pointing away from the antenna suggest that the new filters are doing a good job. A spike off the lower-band edge is seen but it only reaches a maximum of the unfiltered band. Occasional in-band RFI is seen but this is present even when USN is not transmitting and so must be from another source. No band compression or changes in band shape are seen when the transmitter is on.

Bandpasses with transmitter on and pointing at USN antenna:

Bandpasses with transmitter on and pointing away from USN antenna: