Information on this page still needs to be improved
This is information about the 76 GHz EME stations with performance data.
In measuring Moon noise the best
time to measure would be close to perigee, high elevation and a few days after
full moon.
When I tried to find the best timing for moon noise measurement I found the
VK3UM planner tool which predicts moon temperature.
It is clear that measurments on 76 GHz moon noise will
vary quite a lot.
My suggestion would be to add the moontemp from the VK3UM planner tool to the
measured performance.
Stations performance, I still need data on the red blocks, please send me
your info. The list is arranged alphabetical by Callsign
List last updated:
17-07-2023; updated data
from CT1BYM, DL7YC, OE2IGL
Station
Antenna
Nf
Pwr
Sunnoise
Elevation /temp
Moonnoise
elev/temp/humid
CS/G
date of measurement
using WG switch
atm temp
Moon temp
Remarks
CT1BYM
1.2 mtr
offset
6.5 dB
5.1 dB
71 deg/31C
0.4 dB
45
deg/31/30%
0.5dB
16-7-2023
no
-28
227 K
Kathrein CAS120
DL7YC
2.4 mtr
0.4 pf
2.5 dB
11 dB
xxdeg
1.7 dB
xx deg/-2/25%
winter 2022
no
OE2IGL
0.63
mtr
offset
6.2 dB
5.78 dB
53 deg/22/22%
-
-
19-4-2019
yes
Gibertini dish
RW3BP
2.4 mtr
offset
0.85 dB
14.6 dB
35deg/5/36%
3.9 dB
45 deg/-12/90%
4.25 dB
winter 2017
W5LUA
2.4 mtr
offset
4.5 dB
6.5 dB
0.4 dB
The setup from CT1BYM in the 1.2 mtr offset dish
Setup from DL7YC with DB6NT transverter, a low noise pre amplifier and a
feedhorn for his dish
Liquid Nitrogen Cooling pre-amp at RW3BP
Explanation:
Table atm temp: I have been working with a infrared thermometer to measure the temp of the
atmosphere. I think this will give some extra information on atmospheric losses
during the measurements/ The proposal is to measure during the 47 GHz
measurements also the atmospheric temperature at the same angle and direction of
the moon or the sun. I hope this will bring us closer to understanding
atmospheric losses on 47 GHz for EME.
Values can be seen between -20 or -30 during unclouded weather and low humidity
in atmosphere but during clouded weather or unclouded weather with high humidity
the measured atmospheric temperature will be much higher even up to the level of
ground temperature. We can expect that losses on 47 GHz will be much higher than
when we measure a atmospheric temp at -20 degrees Celsius.
Mind that some infrared thermometers will not measure these low values, a simple
test in your freezer will show you if the infrared thermometer can be used.
Table moon temp: The moon temperature is related to the sunshine on the moon and therefore
directly related to the phase of the moon.
In VK3UM EME planner we can find the moon temp during the measurement, the
proposal is to find this value and add this to the measured data. Up to now I
have seen strong dependency on measured moon noise levels and moon temp, as
might be expected.
