Sky noise measurement
s
with a dual
polarization active dipole antenna
WORKSHOP Radio@auger
, J
anuary
1
4 and
15 200
8
,
subatech Nantes
Didier C
HARRIER
S
ubatech, Nantes, France
Didier.charrier@subatech.in2p3.fr
the
CODALEMA
collaboration
http://codal
e
ma.in2p3.fr
SUBATECH, Nantes
Observatoire de Paris
-
Meudon
Observatoire de Nançay
LAL, Orsay
ESEO, Angers
LPSC, Grenoble
LPCE, Orleans
LAOB, Besançon
(FRANCE)
didier.charrier@subatech.in2p3.fr WORKSHOP Radio@auger
, J
anuary
1
4 and
15 200
8
,
subatech Nantes
2
Active dipole antenna used for CODALEMA
Dipole antenna
Total arm length = 1.21m
Antenna height = 1m
didier.charrier@subatech.in2p3.fr WORKSHOP Radio@auger
, J
anuary
1
4 and
15 200
8
,
subatech Nantes
3
Crossed polarised active dipole antenna
Same preamplifier as the CODALEMA antenna
Dual polarization
V
-
shape radiator made of electric wires
Total arm length = 3.22m
Antenna height = 1.40m
didier.charrier@subatech.in2p3.fr WORKSHOP Radio@auger
, J
anuary
1
4 and
15 200
8
,
subatech Nantes
4
Measurement setup
-
Measurement performed
in a rural area at
Vairé in
Vendée (100km south of Nantes)
-
Dual polarization active antenna
-
Handheld spectrum analyzer R&S FSH
-
24/82MHz passband filter to avoid intermodulation
created
spectrum analyzer
-
12V battery to supply the active antenna
LNA, 36dB
LNA, 36dB
Dual polar active
antenna under test
24
-
82MHZ filter
15m cable
Spectrum Analyser FSH
12V battery
didier.charrier@subatech.in2p3.fr WORKSHOP Radio@auger
, J
anuary
1
4 and
15 200
8
,
subatech Nantes
5
North South and East West spectrum
Accumulation of 17 sweep
during one day LST
didier.charrier@subatech.in2p3.fr WORKSHOP Radio@auger
, J
anuary
1
4 and
15 200
8
,
subatech Nantes
6
Galactic noise variations for few bands
~2.3dB
~2.7dB
~2.5dB
~2.7dB
didier.charrier@subatech.in2p3.fr WORKSHOP Radio@auger
, J
anuary
1
4 and
15 200
8
,
subatech Nantes
7
Galactic noise variation for the 73/77MHz band
-
The measured g
alactic noise variation is
about
2
.5dB
in
both
polarisations from 30MHZ to 80MHZ
-
This experiment should be performed with an automatic
testbench to increase the statistics, and without passband
filtering.
~2.5dB
didier.charrier@subatech.in2p3.fr WORKSHOP Radio@auger
, J
anuary
1
4 and
15 200
8
,
subatech Nantes
8
Measurement versus simulation
Computed sky noise
response with a NEC2
simulator and this sky
temperature data
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