All measurements by date.

last updated 25may16


All measurements (in reverse time order): (top)

2016

01jun17: rfi from sband console in dome.
19oct16: p3094 on/offs lbw. gns rfi.
11oct16: az encoder rfi measured in screen room.
16aug16: cband azswing covering 4715-5486 Mhz
18aug16: gps L3 rfi in a2048 data for month of jul 2016.
09aug16: check rfi from BU all sky imager in antenna test range building.
09aug16: scanning the U-NII (5.15-5.85) band for out of band emissions
08aug16: cband azswing covering 4715-5486 Mhz
28jun16: cband azswing covering 4715-5486 Mhz
25may16: rfi from the new visitor center exhibits using the 327, lbw receivers.
20may16: rfi from the new visitor center exhibits using the spectrum analyzer
20may16:p3094  puppi data sees gps satellite
04feb16: turning the sband console on,off after removing external ups, power supply
03feb16: 4Mhz comb from sband console coming from ups outside of cabinet
29jan16: radio redentor tower test: turning off,on cband internet providers
28jan16: turning the sband console (upstairs) on,off after the cabinet repairs
28jan16: 327 rfi: turning the sband console (upstairs) on and off.. before repairs.
28jan16: fixing the shielding gasket on the turret control box (in the dome)
27jan16: 327 rfi:probing the sband console (upstairs) with the anritsu
25jan16: hi frequency resolution azimuth swings
25jan16: 2370-2375 rfi from at&t turned off
19jan16: road trip to hq tower, rfi 2370-2375 and 2400 Mhz.
19jan16: road trip to radioRedentor tower. rfi below 5150 Mhz.
18jan16: rfi below 5150Mhz from 12 meter site.
18jan16: rfi at 2370, 2400 from 12 meter site.
13jan16: cband azswings, 5 ghz birdies
13jan16: a2981 on 03jan16 saw 66Khz comb at 1667.5621 Mhz

2015



02dec15:2397 mhz rfi measured at 12meter coming from yiyi's tower direction.
02dec15: 5015-5055 rfi looking from 12meter
06oct15: 1670-1675 rfi on/off transmitter tests with lightsquared.
14sep15: 2380 Mhz rfi not being created in or after our 1st mixer.
11sep15: 08jul15 wapp data taken with 1670-1675 rfi present
02sep15: The 1670-1675 Mhz rfi
08aug15: sbn azswings: rfi: 2357-2367 2373-2390,2397-2412
23jun15: added p2030 zaplists through 23jun15
12jun15: anritsu 3692c synthesizer in the ifl/lo cabinet in the dome.
09jun15: anritsu 3692c synthesizer rfi measured in screen room.
22may15:az swings using ao40 fat dipole. Power at output of dipole.
27apr15: hilltop monitor image of lband radars
03mar15: How the sbw receiver handles the AWS rfi (2110 to 2155)

2014

29aug14: Sick dl100 distomat rfi measured on the telescope
28aug14:Sick dl100 distomat measured (31jul14)in screen room
11aug14: p2030 pulsar search zaplists and periodicities created by puerto rican radars
08aug14: punta salinas not using modeA starting jul14
05aug14: added monthly plots of 1325 mhz band from the hilltop monitoring system.
31jul14:  video camera measured in screen room
09may14: punta borinquen blanking and sidelobe levels.
09may14: faa  blanking. sidelobe height.
08may14: punta borinquen and FAA blanking check
07may14: problems with Claro cell phone tower in utuado.
22apr14: aerostat returns to operation
20apr14   p2865 cbamd run 4-5 ghz on 13apr14 shows avg and rms spectra
28mar14: 5030-5070 , 5070-5100 out of band wifi emissions from yiyi's tower
17mar14: 430 Mhz rfi with a period of 10 seconds.(fixed 21mar14)
04mar14: 327 rfi from meteor camera on antenna test shack.
27feb14: 320-325 Mhz drifting birdie seen feb14 (fixed 20mar14)
23feb14: rfi seen in the p1693 pulsar search
22jan14: novatel gps antenna and receiver (for jade morton) measured in the screen room.
14jan14: faa radar increases center of blanking region by 1 degree.

2013

12dec13: punta salinas blanking sector changes from 78 degrees to 22 degrees in around jun12
29nov13: fraction of time gps l3 was seen in A2811,A2754 data during nov13
01nov13: faa radar blanking in ao direction.
01oct13: faa carsr radar specs
04oct13: punta borinquen radar blanking re-enabled.
may13  : punta borinquen stopped blanking when faa rdr was being upgraded
05jun13: 5-6 Ghz on the telescope after 5020 rfi turned off.
04jun13: 2nd trip to yiyi's tower. Source of 5020 rfi.
04jun13:measure 3rd harmonic of 102.9,104.1 with a dipole.
30may13: 3rd harmonics and intermods of fm 102.9,104.1 from route 10
30may13: 5020 Mhz rfi coming from yiyi avila's tower
29may13: 1419.963,1667.957 birdies from dustbin controller on az arm
25may13: lidar xband radar rfi in xband receiver
20may13: az swing with lincolnLab wide band feed. Shows rfi at input antenna output. 150-1000Mhz
15may13: lincoln lab feed 150-3100 Mhz rfi. shows power at output of antenna.
09may13: narrow band tone at 1200 Mhz.
29apr13: measuring the punta Borinquen radar blanking in the AO direction.
23apr13  Punta Borinquen carsr radar at 1274,1332 Mhz
11apr13: cband: 4920 rfi present 06apr13-09apr13.
06apr12  cband azswings covering 5-6 ghz done on 28aug12.
03apr13   netgear gsm7238fs network switch. Measured 17oct12 by luis in the screen room.
01apr13: netgear prosafe gs110tp network switch. Measured 0sep12 by luis in the screen room
01apr13: netgear prosafe gs110t network switch. Measured 16oct12 by luis in the screen room
31mar13: Softek ivuloto device at visitors center. measured 15oct12 by luis in screen room.
27mar13: 6900-7050 rfi seen 11mar13,16mar13 by chris salter in cbh
24mar13:Mapping screen room birdie strength to detectability on the telescope
22mar13: azimuth peak when transmitting from control room balcony.
22mar13: elo touch screen cash register. Emissions in screen room and on telescope.
15feb13: LB65-00600 trlaser distomat checked for rfi in screen room.
14feb13: galfacts see broadband rfi in alfa
01feb13: x111 dynamic spectra for lband nov/dec12
28jan13: spectrum analyzer at building 2 a/c unit shows rfi.
24jan13: rfi seen when building 2 power cycled.

2012

30nov12: az swings with polA filter removed tv station intermods,az dependence, time periodic birdies
30nov12: ham rfi in the 440 band.
25sep12:cbandHi azSwings using 6-7 Ghz
28aug12:5275 Expernet test from jonathan friedman's house
01jul12  glitches in rf from alfa monitoring are only present with bias monitoring.
28may12: added galileo gns satellite page... 17may12 galfacts rfi from galileo.
23may12: strobe lights from yiye avila's tower on mount roncador
11may12: faa radar ipps jump by .3%. Dip switches at radar probably set incorrectly
30apr12: 2394.4-2403.5 RFI coming from yiye avila's tower (roncador)
30apr12: 3rd harmonics of fm stations 104.1,102.9 from route 10.
21mar12: 5990-6020 microwave link rfi.
08mar12: 2140-2150 AWS rfi,.
20jan12: corcom ac power line filter.

2011

05dec11: vlfant from sri. azswing narrow band around 1400Mhz.
08nov11: 2mhz comb in 327 receiver (03nov11 data).
08nov11: alfamotor controller rfi at 327 mhz checked on 03nov11.
07nov11: visitor center   power shutdown on 01nov11
02nov11: puntasalinas creates intermods in alfa
01nov11: xmiting a birdie from the visitor center platform.
17oct11: 2400 Mhz rfi moves down to 2396
12oct11: added hilltop monitoring monthly plots of ism band.
30sep11: 6595 Mhz rfi, 30 Mhz wide seen in a2622 cband hi data.
29sep11: 1408 Mhz rfi coming from the AC unit atop building I.
26sep11: 1408 Mhz rfi seen in a2010 data.
16aug11: 1360.015 rfi azswing.
15aug11: 1360 narrow band rfi
15jun11: TRelectronics distomat (LLB500-00600) rfi in screen room.
10jun11: tested compressor monitor on the telescope 06jun11 using 327.
03jun11:  A2335 polB compresses with longer recovery time.
18may11: a2335 sees rfi at 1367 Mhz (punta salinas chan 18)
10may11: the 1999 site power shutdown.
20apr11: testing TR electronics distomat on telescope.
15apr11: rfi test in screen room of compressor monitoring system.
08apr11: iLon smartserver 2000 AC controller rfi test.
07apr11: Accurange 3000 laser range rfi test.
06apr11:TRelectronics distomat (LLB-60-D) rfi in screen room.
28mar11: radar intermods in galfa spectrometer.
14mar11- 1357.2 Mhz rfi.
09mar11: az dependence of 327 rfi
08mar11- alfa motor controller, dome cameras rfi at 750 Mhz.
02mar11- alfa motor controller, dome cameras, distomat rfi at 327
25feb11 - 1st look at 12meter rfi from inside the pedestal.
22feb11 - rfi at 2380 goes off when tower transmitter turned off.
22feb11 - az swing 19jan11 looking at 2380 rfi.
20jan11 - rfi appears at 2380 Mhz

2010

01oct10: 1340 Mhz tone after replacing radar blanker gasket.
28sep10: 1340 Mhz tone coming from radar blanker lo.
27sep10: freq scan of lbw. dynamic spectra, avg spc, rms/mean, tp vs time.
27sep10: gps l3 in a2010 data. on for 26 minutes
24sep10: 5670 8 Mhz wide rfi in cband (telescope and hilltop).

2009

08nov09: 1375 mhz rfi.
11sep09: 1390 rfi  in alfa coming from aerostat
09aug09: rfi from azimuth encoders
11jun09: rfi from sband  console/alfa motor.
18jun09: freq hop 750,753.7. Source of  rfi in 800 Mhz rcvr.
14jun09: az swing looking at 700-800 Mhz
16may09: intermods seen in alfa/pdev.
16may09: table of radar intermods created in 1st and 2nd mixers of alfa/pdev/wapps
05may09: rfi from lbw crosshead
26apr09: radar looking rfi in alfa data at 1403,1424, 1475 Mhz.
11apr09: gps l3 in a2010 data jan09-mar09
03apr09: 430 dome, peak hold spectrum at dewar output during az swing.
02apr09: 4 az swings with dome at 19 deg. looking for birdies at 430.
20mar09: 1422.5 MHz birdie from tv channel 54
19mar09: GPS L2, GLONASS L2, and COMPASS E6 rfi 1200-1300 MHz
23feb09: 1385 Mhz birdie in alfa from the aerostat.
04feb09  spectral scan data taken with 800 Mhz rfi feed 18dec09


2008

30oct08: Check how clean 839 Mhz is using hilltop monitoring data for oct08.
28oct08: wide spectral variations in upper half of ch band.
23sep08: baseband data take during gps L3 test.
04sep08: gps satellite flies thru a2010 observation causing birdies at 1346.7
24jun08: modelling the faa radar to compute the total power periods.
25mar08: za locations for alfa power jumps when at the meridian
25mar08: alfa power jumps and long recovery times from radars (using pdev)
2007

12apr07: 1330/1350 faa radar ipps jump by 9 useconds.
03apr07: radar comb seen in 28mar07 serendip 5 using alfa.
05mar07: when the faa radar transmits at 1330 and 1350 Mhz
13feb07: lbw some rfi plots around 1100 Mhz.
07feb07: gps L3 test on 06dec06. a2010 data.

2006
14dec06: large birdies at 418.625 and 419.2 Mhz.
04dec06: The 1548 Mhz birdie generated by the new cell phone detector
18oct06: looking at the rfi from the axis212 web camera
05oct06 - az,za encoder 614 Khz comb seen at 430Mhz
03oct06: 614 Khz comb in 327 Mhz receiver.
05sep06: A 1378 Mhz cfr, 3.2 Mhz wide radar appears for 430 seconds.
19jul06: punta salinas radar blanking test
18jul06: az,za dependence of rfi using xmitted birdies.
17jul06: 1200 Mhz narrow birdie
12jul06: 1188 birdie, 66 Mhz comb from kronos timecard reader
06jul06: birdie near 1320 Mhz.
07apr06: distomat birdies after window replacement
26apr06: rfi from trenddata ethernet switch with and without fiber installed.
18apr06; 750, 40 Khz combs in 327 receiver come from sband console in dome.
16apr06: 750 Khz and 39.45 Khz combs in 327 receiver
13apr06: testing the trenddata gigabit switch for rfi.
28mar06: look at new ac units in dome. Compare with comb from old unit.
24feb06: compute the harmonics in the alfa/wapp receiver with cfr=1385 Mhz.
16jan06: 28oct05 327 az swings show birdies with 1 minute periodicity
15jan06: wideband look at Dome ac birdies in 327 Mhz rcvr.
14jan06: 3rd harmonics of fm stations appearing in band
10jan06: placing hipass, bandpass filters before the 327 rcvr 1st amp
2005  (top)
06dec05: The ac units in the dome cause the 1 Mhz comb in the 430 receiver.
02dec05: 430 Mhz birdies with 1 minute periodicity.
30nov05: compression in the alfa receiver with the 100 Mhz installed.
03nov05: cleaning up the 327 MHz band
28oct05:  327 Mhz birdies and their azimuth dependence
21oct05: 327 Mhz spectral density at output of 1st amplifier (before the rf filter).
17oct05: location of 1350 faa radar aliases in alfa.
16oct05 1 Mhz comb in 327 receiver from both dome AC units
28sep05: 1300/1400 Mhz birdies coming from the wapps.
20sep05: cell phone harmonics in lbw when transmitting inside the dome.
05sep05: 16khz comb at 327 MHz. grounded the shields for the alfa motor cables.
27aug05: the 16Khz comb in the 327 receiver is coming from the alfa motor controller.
01aug05: compression, baseline variation with long recovery in alfa (from faa radar).
12jun05: 1428 Mhz birdie in alfa 18may05 thru 23may05
03jun05: 16 Khz comb in 327 Mhz receiver.
08may05: aerostat compresses alfa receiver when oh filter bank amps were in.
27mar05: faa 1350 Mhz radar appears at 1380 Mhz in alfa survey data.
26feb05: punta salinas not staying in mode A
2004
14dec04: 60 Mhz drifting harmonics at lband.
23nov04: 9186. Mhz in xband receiver coming from oscillation in sbw dewar.
18nov04: measure the distomat birdies after some shielding work.
17nov04: punta salinas runs with chn 18 (1367/1382) on during the night.
04nov04: lband drifting 60 Mhz harmonics are not coming from the dome AC units.
14oct03: 1289.7 Mhz birdie for a1803 (punta salinas??).
08oct04: test 430 Mhz filter to remove tv station intermods.
06oct04: faa,punta salinas, and aerostat Radars. total power versus time.
28sep04: az dependence of faa radar compression in alfa receiver.
01aug04: alfa signal compression by the faa radar.
02jul04: 1400 Mhz birdies coming from 100 Mhz distribution/wapps
29jun04: birdies around 1400 Mhz while doing an azimuth swing.
11jun04: drifting harmonics in lband with 60 Mhz spacing.
30may04: distomat birdies after communications changed from copper to fiber.
may/jun04: summary of birdies in 430 Mhz band (compiled by chris salter).
28may04/07jun04: 1374.495 Mhz birdie.
28may04: 1400 Mhz birdie.
2003  (top)
03dec03: 372Khz comb in 327 rcvr coming from sband Tx console in dome.
01dec03: 372Khz comb in the sbTx room
24nov03: 372Khz comb at 327 MHz
13oct03: 1422.5 birdie from tv channel 54
19sep03: lbw iridium signal stability.
30jul03: 430 Mhz band with the 422-442 filter in. Looking at tvStation intermod direction.
09jul03: measuring 426.25 Mhz birdie using doppler shift from az swing.
19jun03: 430 birdies: 426.25, 427.75, 432, 432.25, 435.75 (tv Chn 14,22 intermods).
29apr03. detect 1290,1350Mhz radars at 1ms with lbw.  Show rotation drift and compression
29apr03. IFLO (using lbw,lbn) compression by the 1330/1350 FAA radar .
13apr03. azimuth, za dependence of 1350,1290, and aerostat radars.
04apr03. Radar power levels in the downstairs IF (1290,1330/1350,punta salinas.
2002  (top)
23oct02. 410 Mhz birdies in 430 dome system.
18sep02. Measuring the power levels at the output of the lbw dewar.
24jul02. 2 Mhz comb in 327 receiver (resolved).
01mar02. 1400 Mhz biridie with azimuth swing
2001  (top)
06nov01. 1381 gps L3 birdie on all the time.
05oct01. tone at 1350 Mhz.
04oct01. Radar harmonics created at the 2nd IF.
20sep01. Measuring the power levels at the output of the sband wide dewar.
sep01- rfi caused by scr installed in  air conditioner compressor.
02,08aug01 1400gr.rfi from tertiary electronics and motors.
02may01 1400gr. Measuring the power levels at the output of the lband wide dewar.
27apr01-11may01 1407gr. 300Khz wide birdie at 1407 (tv station).
22jan01 430gr.  Rfi check of vittara jeep by control room
2000  (top)
26dec00 lbn. Birdies near 1420 MHz. Azimuth swings with dome at 19 degrees za.
26dec00 large ripple in 430 MHz dome receiver.


Radar measurements: (top)

  Significant radar dates:



Known radars Freq
Aerostat balloon radar. 1246.2,1261.2

FAA airport radar.  (CARSR)
1252.5,1257.6
1344.4,1349.6
Pico del este radar 2900-3100
Punta salinas freq agile radar                                 modeA 1228.5,1243.5
1279.5,1294.5
mode B
1228.5,1243.5
1307.5,1322.5
mode C
1279.5,1294.5
1303.5,1318.5
Remy radar    (no longer transmitting)
1270,1290
punta Borinquen carsr  radar (apr13)
1269.4,1274.6
1327.4,1332.6


21apr15: hilltop monitor image of lband radars
11aug14: p2030 pulsar search zaplists and periodicities created by puerto rican radars
08aug14: punta salinas not using modeA starting jul14
05aug14: added monthly plots of 1325 mhz band from the hilltop monitoring system.
09may14: punta borinquen blanking and sidelobe levels.
09may14: faa  blanking. sidelobe height.
08may14: punta borinquen and FAA blanking check
22apr14: aerostat returns to operation
14jan14: faa radar increases center of blanking region by 1 degree.
12dec13: punta salinas blanking sector changes from 78 degrees to 22 degrees in around jun12
01nov13: faa radar blanking in ao direction.
01oct13: faa carsr radar specs
04oct13: punta borinquen radar blanking re-enabled.
29apr13: measuring the punta Borinquen radar blanking in the AO direction.
23apr13  Punta Borinquen carsr radar at 1274,1332 Mhz
11may12: faa radar ipps jump by .3%. Dip switches at radar probably set incorrectly
02nov11: puntasalinas creates intermods in alfa
03jun11:  A2335 polB compresses with longer recovery time.
18may11: a2335 sees rfi at 1367 Mhz (punta salinas chan 18)
28mar11: radar intermods in galfa spectrometer.
11sep09: 1390 rfi  in alfa coming from aerostat
16may09: intermods seen in alfa/pdev.
16may09: table of radar intermods created in 1st and 2nd mixers of alfa/pdev
23feb09: 1385 Mhz birdie in alfa from the aerostat.
24jun08: modelling the faa radar to compute the total power periods.
25mar08: za locations for alfa power jumps when at the meridian
25mar08: alfa power jumps and long recovery times from radars (using pdev)
12apr07: 1330/1350 faa radar ipps jump by 9 useconds.
03apr07: radar comb seen in 28mar07 serendip 5 using alfa.
05mar07: when the faa radar transmits at 1330 and 1350 Mhz
05sep06: A 1378 Mhz cfr, 3.2 Mhz wide radar appears for 430 seconds.
19jul06: punta salinas radar blanking test
30nov05: compression in the alfa receiver with the 100 Mhz installed.
17oct05: location of 1350 faa radar aliases in alfa.
01aug05: compression, baseline variation with long recovery in alfa (from faa radar).
08may05: aerostat compresses alfa receiver when oh filter bank amps were in.
27mar05: faa 1350 Mhz radar appears at 1380 Mhz in alfa survey data.
26feb05: punta salinas not staying in mode A
17nov04: punta salinas runs with chn 18 (1367/1382) on during the night.
06oct04: faa,punta salinas, and aerostat Radars. total power versus time.
14oct03: 1289.7 Mhz birdie for a1803 (punta salinas??).
28sep04: az dependence of faa radar compression in alfa receiver.
01aug04: alfa signal compression by the faa radar.
29apr03. detect 1290,1350Mhz radars at 1ms with lbw.  Show rotation drift and compression.
29apr03. IFLO (using lbw,lbn) compression by the 1330/1350 FAA radar .
13apr03. azimuth, za dependence of 1350,1290, and aerostat radars.
04apr03. Radar power levels in the downstairs IF (1290,1330/1350,punta salinas.
04oct01. Radar harmonics created at the 2nd IF.
Information on some "other" radars.
1997/1999 measured lband radar ipps (report)


Cameras

At the 12meter

18jun12: camera with rfi film across window
15mar12: camera with wire mesh across window.

in the dome:  (top)

08mar11- alfa motor controller, dome cameras rfi at 750 Mhz.
02mar11- alfa motor controller, dome cameras, distomat rfi at 327
13oct03: color camera 5 in the dome causes birdie at 1417.5
 24may02 color camera birdies still there.
09apr02 more rfi from color cameras in the dome.
13aug,20sep01 1400gr. Rfi from color cameras in the dome.


Distomats:  (top)

02mar11- alfa motor controller, dome cameras, distomat rfi at 327
07apr06: distomat birdies after window replacement
18nov04: measure the distomat birdies after some shielding work.
30may04: distomat birdies after communications changed from copper to fiber.
28apr02. lbn Distomat birdie at 1399.82 reappears.
22jan01 lbw. Distomat birdies at 1300,1400 Mhz.


Power meter,multimeter: (top)

23apr01 430gr. Multimeter and power meter inside new rfi enclosure.
10apr01 430gr. Multimeter inside new rfi enclosure.
aug97 430gr. Power meter, multi meter, camera system birdies (ps file).


Tertiary  (top)

02,08aug01 1400gr.rfi from tertiary electronics and motors.


Ac units in the dome (top)

28mar06: look at new ac units in dome. Compare with comb from old unit.
oct05: digital units in dome ac's cause 1Mhz comb at 327/430.
sep01- rfi caused by scr installed in  air conditioner compressor.

Receiver Intermods/Harmonics

Radars:

28mar11: radar intermods in galfa spectrometer.
24feb06    Harmonics created in the alfa/wapp receiver with cfr=1385.
16may05: Radar intermods in alfa first mixer (RF CFR=1375, bw=300Mhz)
16may05: Radar intermods in alfa first mixer (RF CFR=1385, bw=100 Mhz)
16may05: Radar intermods in alfa/pdev mixer 2 , lowBand skyfreq=1450
16may05: Radar intermods in alfa/pdev mixer 2 , HiBand skyfreq=1300
03may05: measured radar intermods in ALFA/pdev SKYCFR=1375

FM stations (mainly 327 rvcr)

09mar11: fm station harmonics in 327 (created outside receiver)
13jan06: 3rd order harmonics of fm stations in 327 rcvr (created outside rcvr)
05nov05: fm station harmonics in 327 rcvr (created outside rcvr)

430 tv stations
27jun03   az spin with 430 Mhz birdies. tv station intermods.

MISC
25jun08   intermods/harmonics created when clipping a sine wave.



 
 

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