New Allen Telescope Array Development

Various feed measurements using the spectrum analyzer. Using feed 4jx. May 09, 2018

Turns out that without the filter there is 600MHz bandwidth to play with.

With 200MHz filter, pointed at az 330, el 30:

Without 200MHz filter:

Pic of the filters, and the 200MHz filter bypassed for feed 4jx:

For reference, here is the original RFCB drawing I found:

Did not see the bump at 1665MHz.

1613.9MHz:

1667.348MHz:

1718.74MHz

Using the spectrum analyzer I discovered there is a spike every 8MHz from 1000 to 2016MHz. ONLY on the new feeds. The old feeds do not have this spike.