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K1SIX's
EME INFORMATION PAGE
US Naval
Observatory:
Sun/Moon Position for ONE DAY only
US
Naval Observatory: Sun/Moon Position for an ENTIRE YEAR
Lunar
Perigee
and Apogee Calculator (Fourmilab, Switzerland)
US Naval Observatory Data
Services: All Links
OTHER EME LINKS
IW5DHN: 6M EME Page
K7RAT's 6M EME
Page with Links
W7GJ's website with
6M Information
W6/PA0ZN's Weak Signal and EME Information and Links
N0UK: Interactive
EME Page for Digital Modes
ON4KST SITE: Includes
an Interactive EME Page
JT65A MODE
IW5DHN recording of K1SIX during 18 July 2004 EME sked
EME REFERENCES & PAPERS
G3SEK:
Polarization
and One-Way EME Propagation
K1SIX WSJT ECHO MODE RESULTS on SIX METERS
Several have asked me what these tests are
all
about. Consider each 1/2 degree (X- Axis) Lunar Elevation point
to
be a bin that will hold data and that data are a rolling average of
many,
many test sessions. If no echo is received then a value of -40 dB is
used.
Once a REAL ECHO is confirmed at least 10 averaging samples are
used
to determine the final value of the data to be recorded. That
data
then becomes part of a constantly updated rolling average and is shown
as a SOLID RED LINE with the Y Axis to the LEFT of the chart. In
addition, a constantly changing plot of the percent probability
of
receiving a measurable echo shows up as a DOTTED BLUE LINE on the same
chart with it's Y-Axis at the RIGHT of the chart. It is hoped
that
after time and a sufficient number of samples the overall results will
clearly show the vertical lobe effeciency of the antennas to be used as
an aid for future 6M EME schedules. As always, time will tell and
all results must be considered PRELIMINARY until such time that a
sufficient
number of samples can be logged. At this time it is believed that
others can perform similar tests and be able to compare their results
against
mine. Before starting this series of rolling average plots, I
"seeded"
each 1/2 degree bin with the BEST CASE ECHO LEVEL ever recorded over
numerous
test sessions. On six meters, many factors come into play with
external
noise being one of the most profound. As of this writing on 12
October
2003, I receive 6M echos at some point during every test session
and the sessions are all randomly distributed across both moonrise and
moonset. The power output is held to exactly 1,000 watts at the station
end (feedline loss to antenna estimated at 0.7 dB). The station
is
capable of a full 1,500 watts at the antenna feedpoint.
6M EME Echo Test Results (6M9KHW only)
Click for some photos and infotmation on the 6M Antenna System
Modeled Vertical Pattern expectation of
both
6M antennas
K1SIX 50 Mile Horizon from 20' below 6m 9EL
antenna
To date, the tests on the 6M9KHW mounted 110' AGL
seem
to show (this is PRELIMINARY!):
1) Moonrise potential from -1.5 to 20+ degrees
depending
upon capability of schedule partner.
2) Moonset potential from +1.0 to 20+ degrees
depending
upon capability of schedule partner.
3) Best lobes for echo probability are: 2.0, 7.5,
9.0, 10.0, 14.5 and 16.0 degrees.
4) Best lobes for maximized signal strength are:
2.0,
4.0, 6.5, 10.5 and (to) 16.5 degrees.
5) With a maximum echo of ~ -13 dB, a lucky day
could
net a completion with a single yagi station!
6) Unsure of correlation with model - Need more
measurements.
7) EME Measure mode produces very interesting/useful
data!
Click here for
K1SIX 6M EME QSO Results to date
Best 73 es Good VHF DXing,
Bob Mobile, K1SIX (ex-WA1OUB)
Hillsboro, NH 03244 USA
If you have comments or suggestions, email me at b_mobile@conknet.com
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