Introduction:

The current daily plots are:

• Daily plots encompassing the previous day. There are 4 sets of the plots:
• The average plots are just the average over the day for each frequency bin.
• The image plots are frequency vs time for each band.
  
• One plot has no bandpass correction
  
• The 2nd set has the minimum channel over the day used to flatten the baseline. This distorts the true bandpass for channels that always have interference but is it good for removing the standing waves in the cables for the higher frequencies.  
• rms/mean.
•  For each channel of each band, the rms is computed for the entire day and then divided by the mean value. This is a sensitive indicator of interference (except for rock stable tones). 
• .pdf plots are created (2 plots per file) which give the best resolution and can be  blownup.
• .gif plots are also provided for users that prefer them (although they are much lower resolution).

• Daily average
• All freq (.pdf)
• low frequency (gif),  high frequency (gif)
• Freq by time:
• All freq (.pdf)
• low frequency (.gif),  high frequency (.gif)
• Freq by time with bandpass correction:
• All freq (.pdf)
• low frequency (.gif),  high frequency (.gif)
  
• Rms/Mean by channel:
• All freq (.pdf)
• low frequency (.gif),   high frequency

images by frequency for last 8 days:

• The 0 to 10Ghz data is split into two files
  
• Low freq (0 to 1450 Mhz)
• High freq (1600 to 10000 Mhz)
• Each page holds the 8 dynamic spectra for a single frequency (coming from the last 8 days).
• There is one set with no bandpass correction and a second with the bandpass correction.
• The image stretch  (0 to 255) is done on the logarithmic data.
  
• the date is printed on the upper left of each dynamic spectra as yymmdd.
• The freq is plotted as the x axis in Mhz
• Not much rfi is seen above 6500 Mhz
•  the gain in front of the spectrum analyzer is not sufficient to overcome the spectrum analyzer noise.
  

• 3200-3240. This rfi has the same time dependence as the aerostat radar.
• 30nov10.
  
• 3200-1260 = 1940 .. so the aerostat may be mixing with the cell phone rfi.
• This is probably in our system...
• 6500 noise step.
• The spectrum analyzer uses different bands.
  
• There is a band edge at 6500 Mhz. The higher band looks like it has a higher noise temp.
• 1400 Mhz band standing wave:
• period is 8.02 Mhz
• This is a standing wave  distance of 18.7 meters (61.3feet) in free space.49 feet if index of refraction=.8.
• It may be the cable from the antenna to the box. The bpc version removes this.
• 4000-6500 Mhz extra noise during day (08:00 to 18:00)
  
• 30nov10
• more easily seen in bpc  version.
• above 6500 it probably disappears because Tsys of the spectrum analyze goes up.
• I wonder it this is a heating problem?
• if so why does it start at 4000? The system uses the same components 2000 -> 10000.

2300-2650 monitoring the ism band

• The plots are updated 4am each morning for the previous day/month.
  
• Each file contains one month worth of data
• Each page shows one day's worth of data
• The spectra are taken about every 20 minutes. They are plotted on a db scale with an offset for display purposes.
  
• The bottom trace  is the first plot of the day  (usually midnite start of the day).
  
• The top trace  of the day is usually midnite (end of the day .. unless the hilltop monitor system has trouble during the day).
  
• Vertical dashed lines have been drawn at 2380 and 2400 Mhz (for reference).
• The data read from the hilltop monitoring at sband has an offset of 3.6 Mhz.
  
• This was determined by looking at the center of the 2380 xmter signal.
• If you look at this data with imgui, the interference will be 3.6 Mhz higher than these plots..
• licensee's below 2380 Mhz (aug17)

• call	company	freqRange
  wqy2338	att	2305-2310 2350-2355
  wqy2339	att	2310-2315 2355-2360
  wqy2340	att	2315-2320
  wqy2341	att	2345-2350

   
• att : [2305-2320],[2345-2360]
  

• 200301: hilltop monitor  K&L switchbox fails to switch. no more sband data

• 170503: 2370 rfi appears.. continues through at least aug17
• did geographic fcc license search  15aug17 within 200 km of ao, no one is licensed for 2370 band.
• continues till 20sep19.. off the air from maria.
  
• as of 18nov17 still not back on the air.
  

• 150101: ism below 2400 Mhz
• 150301: below 2400 Mhz jumped up to 2425
• 150318: 2425 moved back down to straddle below 2400. occurred during 430 xmter run
• 150810: jumped from below 2400 to have lower edge exactly on 2400 Mhz.
• 151229: 2370 rfi appears. looks like it moved up from 2345
  

• dual band rfi  2360-2340 seen when our 430 Mhz radar is active.
  
• jan: 110112: 2380 Mhz rfi appears (micro wave link from radio rendentor tower).
  
• feb: radio rendentor tower  turns off misbehaving micro wave link 22feb11. 2380 Mhz rfi goes away.
• mar: 24-28mar Ao430rdr.
• may:Ao430rdr on:05,19,26,
• jun: weaker rfi 2380
  
• jul: Ao430rdr :07-09,12,14,16,21,27-31
• aug:
• Ao430rdr: 01-11,19-20,25-30.
  
• 2408 band shifts down by 10 Mhz for 20 minutes on 31aug
  
• sep:
• Ao430rdr 15-16
• oct:
• 05: 2390 band appears for about 3 hours. appears when 2530 band goes off.
• Found licences for 2525-2530 and 2535-2540 (ana G Mendez tv broadcast) but no one at 2532.
  
• 08-12: 2408 band shifts down by 10 Mhz.
  

Monitoring the 1325 band by month

• the data from 1200 to 1410 Mhz is used (this contains most radars)
• two  dynamic spectra of all of the 1 minute peak holds during the month for this band is made
  
• the vertical is day of month. 
• The imgall spectra flags all of the radars
• the imgPS image flags the punta salinas frequency channels
• the avgSpc: is an average spectra for the month.
• top flags all radars
• bottom flags punta salinas radars.
  

Pictures of system

• monitoring system (entire rack) (.jpg)
• monitoring system (amps and filters) (.jpg)
• monitoring system (switch driver) (.jpg)
• monitoring system (spectrum analyzer) (.jpg)
• monitoring system (omni directional antenna) (.jpg)
• monitoring system (high frequency antenna) (.jpg)
  

History

• 080520: unused kl2500 control board 11 switched for bad board 11. System back online.
  
• 080506: kl2500 switch controller board 11 error.. system brought down to lab
• 121017: lightning
•  blows up 20mhz to  1ghz amp at output (between sw10 and sw11)
• High freq amp at antenna  not working.
• 121024:
  
• high frequency data not being taken. (antenna amp in the lab).
• Low freq data is being taken
• FO amp 1 is not longer in. using straight thru. Gain has decreases for all but first 3 bands
• Changed attenuation settting
• Before if followed the ref level setting.
• Now it can be specifed 0,10,20.. or -1 to follow the ref level setting (which usually left it at 10db)
• edited setuplf.dat so used attn 0db for all low freq bands except first.
• 121105:
• high freq data started again (should have started it on 01nov12 but i didn't update the setup.dat file)
• Now using attn db=0 for all high freq (except the first band  1600 to 3000 (to block sband xmiter).
• 130917: mv147 board used to acquire the data died. installed an mv167 board.
• new board had 32 mhz cpu.. eprom was setup for 25 Mhz.. so was running 32/25Mhz faster in waiting for spectra.
  
• 131026: temp fix timing problem. Just changed ticks/sec in integration wait..
  
• 140303: fiber optic amp  port 4 switch 10 died on 25feb14
  
• This was the straight thru mode position (switch 10,11 port 4).
  
• It was being used by the low freq bands (since 2- 1ghz amp is not in)
• Moved straight thru to sw10,11 port 3.a
• also made port 1 straight thru (the amp is not in).
• edited:
• rfiRcvLib.h-RFIRCV_FOAMPID_BYPASS now index 2.. which is port 3
  
• rfiRcvDat.h - rfiRcvFOAmpTbl. index 2 swpos 3, changed cfr,bandwidth to straight thru
• /share/rfidata/data/setups.h  - explicitly set foamp to 3 for < 1ghz if's
• 140912 - took 167 out.. used for pnt cpu. installed 25 Mhz167 board.
  
• the eeproms were set to 32Mhz cpu and this was a 25 Mhz cpu. I ran cpuspeed() to correct this, but i forgot to reboot the computer (it sets the ticks/sec at boot time). So we ran until 07oct14 with longer integrations (80 secs) rather than  60.
• 141007: rebooted rfi crate so correct cpuspeed in use. not integrating for 60 secs.
• 141114 (8am) -> 141117 (8am) the spectrum analyzer was not changing the setup.
• deleted the 1411  14->16 files.
• 150824 - vme rfi crate power supply fails.. no data till 31aug15
• 150831 - intfMon program now run on linux.
• 150902 : ac unit in rfi shack replace.. it had been blowing warm air for awhile
• looking at the 1325Mhz rfi plots.. june looked ok, july starts to show a gain change during the day, and aug has it more pronounced.. so the ac probably started failing in jul15.
• 191122 : 620-830 filter. moved sw4,7 swnum 2 to sw4,7 swnum 4 (swnum2 wasn't working).
• 200301: hilltop monitor  K&L switchbox fails to switch.
  
• 200507: hardcoded  intfMon program to only use lband. So we leave K&L switch box on a single setting and never switch
• So only the 1325 lband data available.
• 201221: galfas2 server gets  os upgrade. forgot to put in changes to talk to hilltop monitor box. No data till:
  
• 
  

schematics

Schematic of electronics inside huffman box (amps, filters, switches) (.pdf)

• notes on schematic
• 191122 - 620-830 Mhz filter. was sw4,7 position 2 move to position 4. this band hasn't worked since jan18.
• change in aosoft/include/rfiRcvDat.h then recompile aosoft/src/vwconvert/libsrc/rfircv/ and intfMon.c
  
• antenna input: sw 1
• sw1-pos 1 - low freq input
• sw1-pos 2  - noise diode high
• sw1- pos ? - noise diode low (has attenuator inline with diodej
  
• sw1-pos5   - outside of box a5 (ant 5) has high freq attached. 
  
• i think the a5 goes directly to the a-5 outside box is high freq cable. I think it goes directly to the 1-10ghz amp.
• sw10,11 switch between amps. These are referred to as the fiber optic amps.
• sw11 shows 4 positions. This switch has at least 5 positions (since the high freq single connects to pos 5).
  

diagram of high frequency mast (.pdf)

System modification history for the 1 - 10 Ghz receiver:

Notes:

Noise floor:

We then measured the noise floor with the high frequency antenna, ampA, and the 50 foot cable plugged into the spectrum analyzer (the 10db pad was always in) to see how much more gain we needed to get above the spectrum analyz noise floor.  Finally we plugged in the whole high freq receiver (ampA,cable,3db pad, ampB(25db) and recorded the noise floor. The spectrum analyzer steps bands near 6500 Mhz.

Noise floor measurements 29oct02

freq (Mhz)	ref Level dbm	rbw Mhz	spectrum analyzer  floor(dbm)	antenna ampA,cable floor(dbm)	antenna full rcvr floor(dbm)
			low freq
100	0	.1	-78
500	0	.1	-76
1000	0	.1	-75
1300	0	.1	-75
1400	-20	.1	-79
			hi freq
1000	0	3	-63	-63	-64(800Mhz)
2000	0	3	-62.5	-62	-57
3000	0	3	-62	-62.5	-60
4000	0	3	-63	-61	-61
5000	0	3	-62.5	-62.6	-60
6000	0	3	-62	-62	-61
7000	0	3	-58	-58	-58
8000	0	3	-56	-56.5	-56.2
9000	0	3	-56	-56	-57
10000	0	3	-56	-56	-57

Amp A with the 50 foot cable is not above the spectrum analyzer noise floor.
Amp A, cable, 3db pad, ampB(25db) is above the noise floor at 2ghz but by 3 ghz the noise floor is being set by the spectrum analyzer. We probably could use 10db more but may then have problems with harmonics.

Online datataking program

• the online datataking program is intfMon. In runs on the rfi sbc in the rfi vme crate
• Source location:
  
•   /home/phil/vw/intfM/Progs/intfMon.c
• include files: /home/phil/vw/h
• rfiRcvLib.h .. defines structures and defines for each rcvr band we use
• rfiRcvDat.h .. fills in the structures from rfiRcvLib.h with the switch positions for each freq band.
• setup file to run program. This is read by intfMon at startup.
  
• /share/rfidat/data/setup.dat
• Each line of this files specifies a receiver band to take data on. The program continually loops through all of these.
• a -1 in the antenna number field tells the program to
•  look at the cfr for this entry.
  
• Find this center freq in the  rfiRcvFilterTbl[] (defined in rfiRcvDat.h)
  
• Use the switch settings found theree.
• This is used for the low freq 0-1400 Mhz disc cone.
• the high freq ant specifies each band (since the changes only occur in the spectrum analyzer).
• The filter id field is an index into the rfiRcFilterTbl[] defined in rfiRcvDat.h).
• the index is filterId -1.
• This gives most info about how to setup the path.
  
• Antenna numbers/IDs
• These are the numbers marked on the outside of the huffman box where the various antenna cables enter

• antId	source	destination
  1	low freq disc cone	sw1 pos1
  2	noise diode (hi)	sw1 pos2
  3	noise diode (low..withpad)	sw1 pos3
  4	not used?
  5	1-10Ghz freq	goes to 1-10Ghz amp

  
  
• The noise diodes need a voltage source to drive them. I don't see any cable connect to them
• sw1Pos5 has a load on it (since high freq doesn't go thru sw1 (check..)
• fiber optic amps (sw10,11).
  
• foAmpNum in setup.dat and rfiRcvFilterTbl is index-1 into rfiRcvFOAmpTbl. This table specifies sw10,11 and other info.
  

• fiberOpticAmp	sw10	sw11	Notes
  0	4	4	same as foAmp4
  1	1	1	20-1ghz 36.5db gain
  2	2	2	1-2ghz 36.4 db gain
  3			not used
  4	4	4	straight thru cable
  5	4	5	high freq cable connects directly to sw11pos5

  
  
• Looking at the code gets a little confusing since the switch positions count from 1 but the table indices count from 0.
  
• High freq observing.
• High freq observing used filter number 15. This is the last entry in the rfiRcvFilterTbl[]. The important entries are:
• sw2P1,sw9P3 .. i don't think these are used.
• DantNum (default) 5.
• This is only for reference. The signal goes Ant5->hfAmp->sw11 pos 5
• FOampNum=5
  
• The high freq antenna has an amp out at the antenna.
• The signal comes into ant-5 at the top of the huffman box.
• The signal then goes directly to the high freq amp.
• From the high freq amp the signal goes to sw11 pos 5.  So all you really have to do to select the high freq observing is to select sw11 pos5.
  

home_~phil