153 - 157 MHz

Ukiah, CA
a few days in mid March 2002
©Brooke Clarke, N6GCE

Background

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

Other Spectrum Plots

0 to 200 kHz
118 to 136 MHz
136 to 138 MHz
150 to 154 MHz


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