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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



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


IW5DHN recording of K1SIX during 18 July 2004 EME sked
IW5DHN sked


G3SEK: Polarization and One-Way EME Propagation

  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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