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.
| Known radars | Freq |
| Aerostat balloon radar. | 1242-1262 |
| FAA airport radar. | 1330,1350 |
| Pico del este radar | 2900-3100 |
| Punta salinas freq agile radar | 1232-1390 |
| Remy radar | 1270,1290 |
| punta Borinquen
carsr 1274/1332 Mhz radar (apr13) |
1274,1332 |
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)
18jun12: camera with rfi
film across window
15mar12: camera with wire
mesh across window.
