If you have any possible contributions, please contact me.
Rey rey@naic.edu
by Frequency by Source/Type Found and Fixed
410-445 bw = 6 MHz, 10 or 12 sec rotation ipp 3.28 millisecs Hawkeye airborne radar
427.485 cabinet door open 5aug99 MULTI METER in dome
428.?? digital multimeter for dome tilt sensors..
428.615 Data burst every 5min. May be Amateur. SE of AO. In process of locating (when??) or digital multimeter for dome tilt sensors...
429.096 visible door closed 5aug99 CAMERAS in dome
429.098 narrow aug99 CAMERAS in dome
429.157 5aug99 PWRMETER in dome
429.544 narrow aug99 CAMERAS in dome
429.550 visible cabinet door closed 5aug99 CAMERAS in dome
429.741 cabinet door open strong 5aug99 MULTI METER in dome
430.486 cabinet door open strong 5aug99 MULTI METER in dome
432.428 bw=2MHz radar ipp 3.5,4.6,3.3,4.2 millisecs antenna sweep rate about 7.8 rpm appears to southeast dec96
433 LATR (Large Area Tracking System - airborne) activity reported for period of 1-21 Apr. 2002 0900 to 2300 hours.
432.024 narrow aug99 gets smaller when cameras in dome are turned off, but doesn't go away completely.
433.325 strongest visible birdie with cabinet door closed 5aug99 PWRMETER in dome
436.?? 1MHz birdie appeared when we went off the air for hurricane season, see it on the line feed and in the interference monitoring system. hops in freq across about 1 mhz in a short time span (seconds). IntfMon sees it start up around 10am. the line feed is much more sensitive to it... sep95
452.275 single peak 19jan99 beeper or data comm. (harmonics: 904.55-2, 1356.825-3, 1809.1-4)
462.875 beeper.. strongest around center 462.8752
19jan99
harmonics @
925.75 2
1 peaks separated by 8khz at the fundamental
1388.625 3
1851.5 4
1160 tone apr99 ch1 synth for lband feed for serendip.
1227.60 gps L2
1246.2 aerostat radar
1246+.4375n GLONAS satellites L2.n=1->24,n13-24 shutdown soon. leaving n=12,21,22, and 24 aug98
1261.2 aerostat radar aerostat mou. L-88A RADAR. 160 usec 1261.2 then 160usec 1246.2 bw 1.67Mhz, prf 305(avg)
1270.9 remy 14apr99
1275 Punta Salinas Radar??? ipp 2736.467 ms. drifts by a usec in say 10 minutes rms/mean of period for 4 secs.. .0025 31dec96
1284.5 bw=2.5MHz Strong, time variable
1294.8 bw=1.5MHz Radar 5rpm ipp 2.7ms, 5us pulse, not locked to 1307.5, Punta Salinas Radar nov92
1300 bw=39kHz CH2 synthesizer
1305.6 present whenever observed Mar., 2002
1306.7 bw=78-156kHz Borinquen Radar
1307.5 Radar, 5rpm, 5us pulse, ipp 2.7 ms was Borinquen Radar. nov92
1314.5 bw=1MHz Weak, time variable
1315.4 bw=78-156kHz Weak, time variable
1317.8 bw=1MHz Weak, time variable
1324.8 bw=78-156kHz From 1420 LO system when HP synth. not plugged in. Plug synth. into rack B. nov92
1330 bw=1.5MHZ FAA Radar, Pico del Este
1333.8 bw= 1MHz Time variable, infrequent
1349.6 bw=1.5MHz FAA Radar, 6 us pulse 1330,1350, ipp 2.813896ms
1350 bw=39kHz CH2 synthesizer, also FAA radar Pico del Este
1350 constant when using the blanker Mar 2002
1353.3 Riccardo G. 13th harmonic of WERR-FM 104.1 MHz
1357.2 bw=78-156kHz
Very time variable
1360.2 bw=78-156kHz
Very time variable
1360.6 bw=78-156kHz
Very time variable
1362.8 bw=78-156kHz
Very time variable
1370.8-1371 on occasionally but large when present Mar 2002
1373.122 narrow CAMERAS in dome aug99
1381.05 bw=1MHz GPS L3 satellites on the air for 30secs twice a day. sep91
1382.646 narrow CAMERAS in dome aug99
1383.5 bw=39-78kHz
Strong, infrequent
1386.3 jan93
1386.7??? jan97 time variable , strong. modulated..
1387.5 jan93
1388.55 3rd harmonic 462.85
beeper system. megapage 1996
angel padilla..288-1210..bayamon.. 1998
1388.6 3rd harmonic of Borinquin
Beepers at 462.875 MHz apr93
For 6 sec integration time,over multiple days this birdie appears in almost
every scan
with vairing intensity.
9sept99
1388.?? two birdies at 1388.539,1388.563.
delta=24khz. avg is the 3rd harmonic of 462.85 .
there is a station 18 (km,mi?) away in villaba. Although there are many
stations in this range.
All have 8khz spacing which would fit the 3rd harmonic 24khz spacing...
dec95
1389.43 present only very briefly at night for several
nights running. Observed by A1356
May be related to something at 1360 MHz May 10 1999
1389.6 Present about 4% of time
1390.8 Possibly 3rd harmonic
of 463.6 paging system Cerro Punta.
Belongs to "Mr. Beeper". Was measured on a visit to
Cerro Punta (may not be within FCC specs,just barely).
feb93
1392.195 narrow CAMERAS in dome aug99
1393 bw=39-78kHz Always present, drifts slowly in freq between 1392.0-1393.3
1400 bw=39 CH2 synthesizer
1417.5-1418 always present Mar 2002
1418.8 Not always present sep92
1420.798 narrow camera in dome aug99
1420.808 cameras in
turret room. jul99
1422.5 2nd harmonic of WCCV-TV CH 54
and other unidentified source, seen when WCCV off
1430.2 bw=1MHz Military radar
1430.347 narrow CAMERAS in dome aug99
1432.2 bw=1MHz Military radar
1434.1 bw=1MHz Military radar
1449.397 narrow CAMERAS in dome aug99
1575.42 GPS L2
1602+.562n GLONAS.n=1->24,n13-24
shutdown soon. leaving aug98
n=12,21,22, and 24
1612.34 Mhz - Very narrow ~ 1 channel ( total bandwidth was
sept99
.2 MHz, over 1024 channels=> 1channel = 0.1953 kHz)
It was not seen last July, 1999. Always present,
Mike Davis thinks it is internal (variable strength).
1665.36 MHz, - New birdie lasted for ~ 10 min on 09/07/1999,
(about 4:30 am). Only on Pol B.
1720 MHz, weak or absent from 4AM to 6AM, strong after sunrise,
Project A1518 April, 2002
2700 sj radar 1350 2nd harmonic seen in rfi system. maybe us may96
2900-3100 SPS-48 radar at
Pico del Este. Radiates at 9 distinct frequencies simultaneously. Peak
Power Output (EIRP):
2.2 MW at low elevations
600 kW at intermediate elevations
60 kW at high elevations
Pulse Repetition Frequency: 640 with some jitter
Rotation rate: 15 rpm
Pulse width: 26.5 microseconds
A spectral plot taken at Roosey confirms the spread in transmission
frequencies but with most emission confined within 2990 and 3060 MHz. The
AO monitoring shows the same characteristics. It appears that the 9 frequencies
can be chosen by the operator anywherewithin the band to adjust to range
requirements. jun13
3050 pico del este navy radar. seen in rfi system may96
4050 sj radar 1350 3rd harmonic seen in rfi system. maybe us may96
5400 sj radar 1350 4th harmonic seen in rfi system. may96
6100 pico del este navy radar.2ndH seen in rfi system maybe us may96
6750 sj radar 1350 5th harmonic seen in rfi system. maybe us may96
8100
sj radar 1350 6th harmonic seen in rfi system. maybe
us may96
RFI Identification by Source/Type(MHz)
External
1388.6
3rd harmonic of Borinquin Beepers
at 462.875 MHz
1388.??
two birdies at 1388.539,1388.563. delta=24khz. dec95
avg is the 3rd harmonic of 462.85 . there is a station
18 (km,mi?) away in villaba. Although there are many
stations in this range. All have 8khz spacing which would
fit the 3rd harmonic 24khz spacing...
Using the radio in nov. rey an i didn't get a good correlation
between the radio at 462.85 and the 1388 birdie when we
were up on the hill. When looking at this with specAna be sure
and set the rbw real low...
1389.6 Present about 4% of time
1390.8
Possibly 3rd harmonic of 463.6 paging feb93
system Cerro Punta. Belongs to "Mr.
Beeper". Was measured on recent visit
to Cerro Punta(may not within FCC
specs,just barely), in the process of
contacting owner.
Pico del Este
1330 bw=1.5 MHz
FAA Radar, Pico del Este
1349.6 bw=1.5 MHz
FAA Radar, 6 us pulse 1330,1350,
pp 2.813896ms
2900-3100 SPS-48 radar at Pico del Este. Radiates at 9 distinct
frequencies simultaneously. Peak Power Output (EIRP):
2.2 MW at low elevations jun13
600 kW at intermediate elevations
60 kW at high elevations
Pulse Repetition Frequency: 640 with some jitter
Rotation rate: 15 rpm
Pulse width: 26.5 microseconds
A spectral plot taken at Roosey confirms the spread in
transmission frequencies but with most emission
confined within 2990 and 3060 MHz. The AO monitoring
shows the same characteristics. It appears that the
9 frequencies can be chosen by the operator anywhere
within the band to adjust to range requirements.
GPS
Aug99 S-Band wide, strong, and random around 2380MHz. The
shutter of s-band receiver was oscillating due to a micro switch not being
actuated completely.