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 |
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)