Device specific birdies
47 part 15 radio frequency devices
|05oct||Birdies coming from the azimuth encoder comb (more
They all share the same azimuth dependence (although 324.41 and 325.64 look a little different). The strongest is 324.41 at 1.6 Tsys in a 24 Khz resolution bandwidth.
The encoder comb is spaced at 614.368 Khz (where 1 freq is 320.719). The table below shows the frequencies for the comb in the 327 band. The resolution in the step is probably hz. The resolution in the offset is 10 to 20 Khz (determined by the rbw):
||meteor video camera on top of
antenna test building (more
||a birdie drifting up to 4 mhz
in 24 hours was seen in the 327 receiver feb,mar14. It was
coming from the sbn postamp chassis. (more
||ac building 2 during building
II turn off (more info)
There are also weaker birdies from this
(3) --> a triple
|410.5249||<.003||oct02||active||Coming from 1000 foot navy tower in aguada.(more info)|
|tv chn14,22 intermods moreInfo
alias of 423.5 using 12.5 mhz digital filter
jan05-low loss filters to notch out tv stations inserted in front of dewar. (moreinfo)
|dec05||active||These birdies have 1 minute periods (more info).|
|aug99||dome camera birdies at 430 mhz when the iflo cabinet door was open. Note seen when the door was closed. (more info)|
|425-440||6||aug01||radar||Airborne radar. customs or navy. Usage decreased since war games at rosy rodes stopped. Can tune to a 6 mhz band between about 420 to 440 Mhz. Easily seen on the hilltop rfi monitoring plots. (more info)|
|az swing peaks at -59 az. When this signal was baseband
samled, it looked like a phase lock loop that was sweeping
back and forth thru its input bandwidth as if it was out of
lock. The sweep time took 12 seconds to repeat.
|<.001||aug99||Power meter in dome (429.16,433.32). 433.32 is
Multimeter in dome (427,430)
They were first placed in the shielded iflo rack in the turret room (birdie_Strength)
The power meter and 1 multi meter was then placed in an rfi shielded box within the iflo rack. The 2nd multi meter is still in the iflo rack.(more info)
||strong 430 birdie 10e3*Tsys
every 10 secs (lasting 180 millisecs)
coming from a motorola 460 Mhz repeater on tua's tower in utuado (more info)
849-851 ground to air
895-896 air to ground
limited towithin 300 miles of mainland because ground stations are used.
ac bidco sister company of aircell.
||pge smart meter wireless
|1090||secondary surveillance radar (SSR) and air borne collision avoidance systems (ACAS). Seen in hilltop monitoring system.|
||GPS L5 coming.. +/- 12.5 Mhz.
||A tone at 1200 Mhz has been
present since we began recording the fractional occurrence
of rfi from the telescope data.
It is less than .05 Hz wide and it is located at 1200Mhz. It is coming in through the horn since the amplitude repeats with with the same az,za. It looks like it is locked to the station clock. (more info)
|1215 to 1400
|Punta salinas frequency hopping radar. 12 sec rotation. short and long pulse lengths: 51.2 and 409.5 usecs. When we request, they will sit in mode A (1232,1247,1241,1256 Mhz) rather than hop thru the entire band. the the complete set of frequences see: (freqList)|
Pcode 5.11Mhz bitrate, Satellite spaced .4375 Mhz
Lowest carrier cfr: 1238.9375
|Aerostat radar ballon in lajas. dual freq or quad
freq modes. 160 usec per pulse, chirped. Rotation rate 11.59
secs. Blanks toward AO. (see aerostat
15dec11- tether breaks, balloon rises and then bursts. aerostat offline.
|Punta Borinquen CARSR (Common Air Route
Surveillance Radar). Installed 01apr13. They blank when
pointing in our direction. This is a spread spectrum
radar with 3 ipps. It transmits 5*ipp0,5*ipp1, then
5*ipp2. The transmitted pulse sequence is:
( This radar has replaced the 1270,1290 radar that used to be at punta borinquen/remy radar)
out of service
|Punta Borinquen Remy Radar at the end of the runway
.(fps20-93a). 12 sec rotation rate, single ipp of 2781. Runs
in 1270 or 1290 mode (not simultaneously). (see radar
This radar has been replaced by the 1269,1274,1327,1332 CARSR radar .. see above.
|when 1270,1290 are both
active they are transmitted simultaneously. These intermods
are created in the receiver (2f1-f2) etc..
|Distomat birdies. Occur every 2 minutes for a few
seconds. Az dependent.Distomats have a 27 Mhz clock.
Data was measured in jan01 (before shielding work)
Data was remeasured in apr02 (after some shielding work).
The window was changed
|faa radar. switched to carsr apr13. more
|1330/1350||.2||jan97||out of service.
switched to carsr
|FAA airport radar.12 sec rotation, 5 ipps about 2.5 ms,5 usec pulse, 1350 then 1330 pulse sent each ipp. (radar info)|
||narrow tone at 1340. this is
from the lo of the radar blanker on the platform.
|feb01||Radar||Radars with 1.94 sec rotation rates. ( more info). These radar were probably associated with military ship practices. Fast rotating radars are needed when objects move far within 1 rotation (planes near aircraft carriers,etc..)|
||stride 100 mbit 5 port
ethernet switch (with fiber converter) that had been
installed on top of the platform in a plastic box.
|1381.05||1||sep91||active||GPS L3 downlink. (more info)|
|1388.55||.024||98||beeper harmonic (3rd of 462.85)|
|1388.6||.024||93||beeper harmonic (3rd of 462.875) (borinquen beepers)|
|may02||dome camera birides. part of a comb of 14.3185 Mhz. (more info).|
|1390.8||.024||feb93||beeper harmonic (3rd of 463.6 (mr. beeper)|
|1407||.3||apr01||fixed||tvChan20 arecibo. Drifted around with time. They were having trouble with their transmitter. (more info)|
||1408.0143,1408.0638 < 500
hz wide. Combs of 50Khz about these.
peaks at az=338.1 (za=15).
coming from new ac unit of top of building I
(Ac also has 80Mhz comb).
|1422.5||tvChan54 2nd harmonic|
|1525-1545||aug03||Inmarsat stdBC ship,portable earch downlinks
Inmarsat stdM ship downlinks
|1525-1559||aug03||Inmarsat stdF ship, stdM portable earth downlinks|
|1530-1559||aug03||Inmarsat airborne downlink|
|1535.0 -1543.5||aug03||InmarSat stdA downlink. RHC xmitted. 339 channels. chan1=1535.025, chn339=1543.475. chn spacing 25Khz. signal bw 12 Khz. FM modulation. chan110 is call announcments. position tracking carriers at 3947.0 / 3949.4 / 3950.6 /3953.0. Info 06aug03|
|1602+.562n||aug98||active||GLONAS n= -7 to 13. more
66 sat, 6 planes, inclined at 86.4deg to pole.
3*16 beams per sat.
90 millisec rep rate.
8 8.29 ms tdma slot. 4 uplink, 4 downlink.
band protect guard time of 22.48 ms
interframe guard times:.1ms upl, .28 ms downlink
delay sat to ground: about 2.6 millisecs
120 fdma chan in 5.15 Mhz. Each chan 31.5Khz
Within each fdma chan there are 8 tdma chan (4upl,4dwnl).
Iridium Next sat Engineering statement (.pdf)
|1626-1646.5||aug03||InmarSat stdBC ship earth station, portable mobile
InmarSat stdM ship earth station uplinks
|1626-1660.5||aug03||Inmarsat stdF ship earth station uplink
Inmarsat stdM portable earth mobile station uplink
Inmarsat airborne uplink
|1636.5-1645.0||InmarSat standardA uplink|
fundamental freq: Fo=10.23 Mhz
|COMPASS chinese GNSS system (more
|see also: Novatel info on
|bas(Broadcast aux serv), LTTS(local television transmission serv), cars cable television relay service. Moving from 17 Mhz chan to 12 Mhz chan (2005).|
wireless band plan (.pdf)
Licensee's in PR:
||lhcp.sband downlink new gps
satellites. As forwards from gps command
Auction #14 wcs 25apr97. PR rights bought by coloma wireless. At&T then bought the rights:
Note block C,D have limitations within 2.3 Mhz of satellite radio
|2320 - 2345
|Satellite radio (SDARS). Each
satellite has 12.5 Mhz bandwidth
sirius xm is coming to pr with terrestrial repeaters (20).
|this was the 2345-2350 wcs block D that att
owns. It comes from the HQ tower above utuado. Around
30dec15 it jumped up to 2370-2375. on 25jan16 we talked to
the engineer and he turned it off.
||ism band unregulated.
|wifi freq 802.11 at 2400 mhz
14 channels, 22 Mhz each
centers separated by 5Mhz: 2412,2417...
use chna 12,13,14:2467,2472,2484 not available
chan 14 ok for 802.11b
||global star downlink. also used for
||band broken up into 87? 1 Mhz
channels. Can frequency hop at up to 1600 hz.
Max output power:100mW,2.5mW, 1mW for class 1,2,3 devices.
|Broadband Radio Service, Educational
transition completed sometime in 2018
band allocation (.pdf)
We saw it with regular band shape around 181010.
|2700||may96||Faa radar 1350 2nd harmonic (seen in rfi monitor.. probably our system).|
|2900-3100||radar||pico del este sps-48 9 distinct freq. (more info)|
|3600-3621||aug03||Inmarsat downlinks LHC (*a)|
|ieee802.11y in use in use..
freq,chan , bw same as 802.11a.. 20 Mhz. with overlap
||fixed, fixed satellite (space to earth)
communications (25), fixed microwave(101)
|3945.5||aug03||marisat trackin beacon LHC (*a)|
|3947.0||aug03||inmarsat tracking beacon LHC (*a)|
|3947.5||aug03||intelsat tracking beacon RHC (*a)|
|3949.4||aug03||inmarsat tracking beacon LHC (*a)|
|3950.6||aug03||inmarsat tracking beacon LHC (*a)|
|3952.5||aug03||intelsat tracking beacon RHC (*a)|
|3953.0||aug03||inmarsat tracking beacon LHC (*a)|
|3952.5||aug03||marisat tracking beacon linear??(*a)|
|4188.72||aug03||marecs satellite tracking beacon LHC(*a)|
||aeronautical radio navigation (aviation (87))
||airplane radio altimeter fm
modulated, sweeps between across the band
(more info .pdf)
||burst lasting 30 sec to a
minute.This band is allocated for space to earth
communications limited to international calls. (see us245
||radio astronomy protected band. US74
companies were/are broadcasting outside of the allowed U-NII
5010-5130 is now clean (jun13). They are still cheating on the 5150 edge of the band. more info
see fcc title47 part15 rf devices UNII devices
Give power,antenna limits
||U-NII Unlicensed National
CPE: Customer Premises Equipment
Neptuno Pr wireless network provider with :Axxcelera equipment
AB-MAX 5.47-5.85 wireless access point.5,10,15 Mhz bw. xmit:18dbm access pnt,15dbm cpe.
AB-full Acces. 5.725-5.85 +5 to +23 dbm ism and
jun13: these bands are pretty much full with internet communications (more info)
possible birdies at :5771,5818,5838 in hilltop monitoring.
||risat-1 indian radar imaging
polar orbit, sun synchronous, period=96.49 minute.
equatorial crossing 6am/6pm (local time)
14 orbits ;per day
||ISM InIndustrial Scientific, Medial band
||Terminal Doppler Weather
radar at punta salinas.
||18sep09 jumped from center
5700 to 5670. an 801.11 band??
been there ever since.
seen in fractional occurence of rfi and in hilltop monitor
||saw in hilltop monitor.
appeared after hilltop monitor came back on line after a few
jumped to 5670 on 18sep09..
FCC new unii band. aug16
|ieee 802.11(a,h,j,n) each
number is the center of a 20 Mhz band
These are the channels uses in us see table
||seen in hilltop monitoring
data. appeared 19apr11 with the 6595 data.probably another
microwave link from roncador (yiyi avila)
||seen in cbhi. appeared
19apr11. probably att mobility microwave link roncador to
arecibo. (more info)
|9186.2||narrow||nov04||fixed||this had sidebands spaced by 85 Khz. It sounded like the
dewar refrigerator when plugged into the radio. Turned out
to be an
oscillation in the sbw dewar (1 channel). By retuning the bias, it went away.
||mayagueaz weather radars.
9410 +/- 30 mhz
||sar radar with up to 300 Mhz
TerraSar-x satellite radar.
launched 2007, leo altitude: 514 km, inclination 97.44, repeat 94.92 minutes.
repeat visit on equator once every 11 days.
tandem-X launch oct09. two satellites orbiting together
does bistatic radar. similiar orbit to terraSar??
may be a bit old
L to C and C to L transponders. Tracking beacons at 39xx Mhz. geostationary satellites. Path loss to earth 188.5 db. Mainly describes stdA
|1,2 Mhz||327||jul02||resolved||This was coming from the power meter on the roof of turret room that reads the power for the 430 Mhz xmter. It is in a huffman box. The edges of the box used a metallic gasket to improve the contact. This gasket contained silver and stopped working do to oxidation. 'resolution: We switched to another gasket material. (more info)|
|327||nov03||resolved||This comb was coming from the sb tx rack in the sband tx room above the turret room. The filters and doors of the enclosure were shot. There was also some problems with some of the cables going into the cabinet. These were fixed. (more info).|
|This was the sband console in the dome again. Inside the cabinet are some covers that need to be screwed in place to increase the shielding. They had been left unscrewed because of some maintenance work that was going on. (more info)|
|Alfa motor controller|
|16Khz||327||apr05||resolved||saw in 327 rcvr. resolved oct05. coming from the alfa motor controller. It is a modulation on top of the 40 Mhz comb from the controller. Resolution is to turn off the motor controller for low frequency work. (more info)|
||the alfa motor controller is making a 7.5 Mhz comb that drifts to lower frequency when it is power on. (more info)|
|40 Mhz||327||oct05||resolved||saw at 320 Mhz. This is from the alfa motor controller. The 16khz comb is center on this harmonic. (more info)|
||The alfa motor controller is
10 Mhz comb.
The 40 Mhz comb (oct05) is probably just the stronger parts of this comb.
|2 Khz||327||oct05||resolved||This is from the alfa motor controller. This comb is centered on the 40 Mhz comb harmonics. (more info). To get rid of it turn off the alfa motor controller.|
|oct05||src found||This comb was seen at 327 and 430. It can wander by up to 30Khz in and hour. The birdie width is about 1 hz. It is coming from the AC units in the dome. There are actually 2 combs, 1 from each ac unit. The birdie is coming from the digital communications portion of the ac unit. Turning off the ac unit with the remote does not make it go away. You need to turn the power off to the ac unit. There is a switch downstairs for the old ac unit. The new ac unit can not be switched off. ( more info).|
|614 Khz||327||sep06||a 614 khz comb in the 327 Mhz receiver. Each element was about 1-3 Khz wide. It showed an az and za dependence. The comb was coming from the azimuth 2 (ch side) encoder. This was a new type of encoder that was installed on 02aug06. The old type of encoder was re=installed (more info).|
||coming from az,za encoders.. more info|
in 12meter cabinet. Not yet seen outside of cabinet. Extends
upwards of 1GHz. This one of our devices so we probably have
this at other spots.
The first 24 frequencies of the comb are:
62.642, 125.284, 187.925, 250.567, 313.209, 375.851, 438.493, 501.134, 563.776,
626.418, 689.060, 751.702, 814.343, 876.985, 939.627, 1002.269, 1064.911, 1127.552, 1190.194, 1252.836, 1315.478, 1378.120, 1440.761, 1503.403,
||This is coming from the cameras in the dome (more info).|
||ac unit on top of building I.
|cameras in dome
|sband console in dome
|turret control box in dome