# Intro:

The 19jan16 road trip that dana and i took showed that the Radio Redentor tower (above Utuado) had internet providers transmitting below the 5150 bottom edge of the U-NII band.

Angel contacted the tower engineer and scheduled a test for friday 29jan16.

# The test:

The test setup was:

• position azimuth=100, za=18 deg. The cband azimuth spins showed this to be a peak for many of the 5 ghz transmissions below 5150.
• The mock spectrometer was set for:
• 7 bands, 8192 chan/band, 172Mhz, 1 second intergrations.
• The band center frequencies were:4900,5000,5100,5200,5300,5040,5500
• Note that band 5 was a typo.. it was supposed to be 5400.. but i typed in the wrong value.. so i skipped displaying this band
• The mock spectrometer was run continuously during the test.
• We communicated the the tower engineer over the phone
• He turned off each internet provider for about 1 minute, then turned them back on
• turning off was fast, turning back on took up to a minute.
• he turned off the following providers:
• DM wireless
• kxXpressNet
• 4Net
• SecureNet
• DM wireless (we repeated this one)

# Dynamic spectra of the test

Dynamic spectra were made for each of the 6 mock bands. The computation was:

• Input the 1500 secs of data
• average the polarizations
• flatten the spectra using the median bandpass for the 1500 secs
• for each freq range, find about 500 channels that did not have rfi in them
• average over these channels and then divide each of these 1500 numbers into the flattened spectra
• this removes the total power variation from the sky.
• Draw a horizontal line where each turn off occurred..label the lines with the provider
• The off cycle normally lasted for 60 seconds.

The dynamic spectra are show in the table below:

 freqRange Notes 4814-4985 4net: 4920-4940 4914-5086 DM wireless 5015-5035 someone else also at 5025-5035 5035-5055 5055-5075 (weaker) someone else also at 5060-5070 5014-5186 DM wireless 5075-5095 (weak) 4Net 5140-5160 (should be above 5150) 5114-5286 ksXpressNet 5205-5225 (legal) 5230-5250 (legal) 4net was turned off after ksXpress There was still no users in these 2 bands i don't know whether 4net uses them or the ksXpernet users hadn't reconnected yet. 5214-5386 ksXpressnet 5280-5300 (legal) also 4net ? 5314-5486 not recorded 5414-5586 dm wireless 5430-5450 (legal) 5550-5570 (legal)

# Summary:

The current status of illegal 5ghz usage is:

 provider illegal frequencies 4net 4920-4940 5140-5160 (need to be above 5150) DM wireless 5015-5035 (someone else at 5025-5035) 5035-5055 5055-5075 (someone else at 5055-5075) 5075-5095 Unknown 5005-5015 5025-5035 5055-5075 5105-5015 5115-1535
• Angel contacted the owner of dm wireless on 29jan16. He said he would look into turning off the illegal transmissions.
• We need to report this to the fcc..
processing: x101/160129/rficb.pro

rfi measurements home
home_~phil