A 20 to 30 db improvement in performance was measured. The output of the L-band system was analyzed with the Spectral Processor. Many unwanted emissions were observed, and several of them are probably self-inflicted. In particular, there are some spikes in the protected band and there are 4 MHz and 1 MHz combs in the data. A strong 1500 MHz signal, most probably from the laser-ranging system, was also observed.
Work is planned to isolate the causes of as many unwanted signals as possible.
In particular, tests will be conducted with the receiver room door opened and closed as a first step in determining which, if any, of the signal originate in this room. Similarly, tests will be conducted with parts of the servo system on and off, with the active surface system off and on, etc. Rick will request that time be scheduled for these tests. Rick also noted that strong signals, like the 1500 MHz signal mentioned above, may create intermodulation products with other interfering signals, resulting in additional lost spectrum. Monitor Station Developments White has some equipment ready to install and is waiting for reasonable weather.