a few days in mid March 2002
©Brooke Clarke, N6GCE
By using the Agilent 4395A in Spectrum Analyzer mode with DISPLAY / DATA HOLD / MAX the trace remembers the highest point that has occurred. After a few days (and in may cases after 15 minutes) a number of signals are captured. Then by manually setting the sub markers and turning on UTILITY / MKR LIST a list appears on the lower half of the screen. Then using COPY / PRINT[STANDARD] with a printer connected a hard copy of the 8 marker frequencies and power levels is produced. Since there are many more than 8 signals the above process needs to be repeated a number of times. Five times in this case. I have manually inserted the data into a table shown below rather than use graphics that take much more bytes to store.The "ext ref" indicator is on because the 10 Mhz time base is from a GPS locked Rubidium source.
MHz dBm Use 153.945 -68 fire 153.080 -82
153.105 -81
153.225 -83
153.365 -70
153.510 -78 elec util 153.755 -73
153.890 -74
153.950 -65 Howard Fire 154.010 -62 Ukiah Fire dispatch 154.355 -73
154.385 -60 fire 154.445 -77 Ukiah Fire 154.515 -75
154.570 -79
154.680 -77
154.755 -55 sheriff 154.800 -78 sheriff 154.815 -74 sheriff 154.860 -68 Ukiah police 154.920 -59 CHP CLEMARS 155.220 -5 school buss 155.370 -75
155.475 -65
155.655 -53 sheriff chopper 155.985 -82 sheriff chopper 156.135 -73
156.195 -81 fire 156.400 -70
156.450 -73
156.475 -80
156.500 -80
156.675 -88
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