tv Station power vs time.

mar,2003

The power in the 6 Mhz band of each tv Station is monitored using the hilltop monitoring system.
There are 5 frequency bands of the rfi monitoring system that contain tv stations: (70, 165, 235, 550, and 725 Mhz). A peak hold on a band (duration 1 minute) is repeated every 20 minutes. This gives 74 measurements per band per day. For each tv station:

For each measurement the sum of the 6 Mhz tv band is computed.
The min, max, mean, and median values for the 74 sums of a day are computed and then plotted.
Year to date and yearly plots are made.

Some things to be aware of:

Each hilltop monitoring band has a different tsys and gain. The plots include these values. At the bottom of each plot are two dashed lines.

The black line is the minimum power in the band for the day.
The red line is the median power in the band for the day.

When the red and black dashed lines go to zero, there is no rfi monitoring data.
Leakage between channels. Tv stations are spaced by 6 Mhz. For strong tv stations there is leakage between channels in the spectrum analyzer. If you see adjacent channels moving together then this is probably the reason. The channel with the higher power is the channel that is resposible for the power.
The spectrum analyzer on the hill may be off in frequency by up to .6 Mhz. This will also mix stations a little.
When the 430 Mhz transmitter is on, many of the hilltop monitor bands saturate. When you see many tvStations moving together, this is probably the reason.
If a tv station jumps around a lot in the median power plot, look at the mean or max power plot. The station is probably turning on for half a day and the median is alternating between catching the on and off power levels.


date	daily median power	daily mean power	daily max power	daily min power
YearToDate	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
2012	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
2011	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
2010	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
2009	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
2008	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
2007	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
2006	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
2005	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
2004	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
2003	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
2002	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
2001	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
2000	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
1999	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)
1998	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)	(.ps) (.pdf)

Notes:

2012:

17oct12 off the error. some amps blown out
restarted with missing amp (fo) and less spectanalyzer attenuation . So changes in power are from this and not the signal getting weaker.

Tv channel frequencies.

processing: x101/rfi/tv/tvmon.pro

 home_~phil