EA6VQ's 144 MHz EME calendar 2020

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   EA6VQ's EME WEEKEND CALENDAR - 2020    EA6VQ's EME BEST DAYS - 2020 (DGRD < 2.0 dB)
  

Weekend
2020

CONDITIONS on 144 MHz

Jan    04-05

Moderate -> Poor

11-12

Good -> Excellent

18-19

Moderate

25-26

Moderate but New Moon on 25th

Feb     01-02

Poor

08-09

Very Good -> Excellent

15-16

Moderate -> Poor

22-23

Moderate but New Moon on 23rd

29-01

Poor

Mar    07-08

Excellent

14-15

Moderate -> Very poor

21-22

Moderate

28-29

Poor

Apr     04-05

Excellent

11-12

Poor -> Very poor

18-19

Moderate

25-26

Poor
May    02-03 Very good

09-10

Very poor

16-17

Moderate

23-24

Poor and New Moon on 23rd

30-31

Very good -> Good

Jun    06-07

Very poor

13-14

Moderate

20-21

Poor and New Moon on 21st

27-28

Good -> Moderate
Jul    04-05 Very poor -> Poor
11-12 Moderate
18-19 Poor -> Moderate
25-26 Moderate

Aug    01-02

Very poor -> Moderate

08-09

Moderate

15-16

Poor -> Moderate

22-23

Good -> Moderate

29-30

Very poor -> Moderate
Sep    05-06 Moderate -> Poor
12-13 Poor -> Good
19-20 Good -> Moderate
26-27 Moderate

Oct    03-04

Poor

10-11

Moderate -> Good

17-18

Good -> Moderate

24-25

Moderate

31-01

Poor
Nov    07-08 Good -> Very good
14-15 Moderate
21-22 Moderate
28-29 Poor

Dec   05-06

Good -> Very good

12-13

Moderate -> Poor

19-20

Moderate

26-27

Poor
        

Days

CONDITIONS on 144 MHz
Jan 11-15 Best DGRD = 0.5 dB on 12th
Feb 7-11 Best DGRD = 0.4 dB on 8th (Best conditions of 2020)
Mar 6-10 Best DGRD = 0.7 dB on 7th-8th
Apr 2-7 Best DGRD = 0.7 dB on 3rd-5th
Apr 30-May 4 Best DGRD = 0.9 dB on 1st
May 27-31 Best DGRD = 1.1 dB on 28th-29th
Jun 23-26 Best DGRD = 1.0 dB on 24th
Jul 20-24 Best DGRD = 0.8 dB on 21st BUT New Moon on 20th
Aug 17-20 Best DGRD = 0.7 dB on 18th BUT New Moon on 19th
Sep 13-17 Best DGRD = 0.8 dB on 14th-15th BUT New Moon on 17th
Oct 11-15 Best DGRD = 0.9 dB on 13rd
Nov 8-11 Best DGRD = 1.2 dB on 9th-10th
Dec 5-8 Best DGRD = 1.4 dB on 5th-7th

The best EME conditions occur when:

  1. The Earth-Moon distance is at the absolute minimum and
  2. The Moon is in the coldest sky region (less background noise) along the moon path.

The effect of distance is independent of frequency, but sky temperature decreases with frequency, up to ~1 GHz and then levels out. The EME signal-to-noise ratio, in dB, is DGRDaded, from the minimum, by a factor (DGRD, see below), which varies over hourly, daily, weekly, monthly and yearly time periods. As a guide for the basic weekend EME conditions the present calendar lists the expected conditions based on the DGRDadation (DGRD) value. Factors such as local noise, antenna beam width, side lobes, polarization, etc. can also affect the s/n ratio of moon bounce signals.

Conditions:

Summary of EME conditions as controlled by DGRD at 144 MHz and New Moon. Conditions may be worse, due to ionospheric disturbance, local noise and polarity, but not better than indicated.

In general, 144 MHz DGRD:

Within a day of New Moon (NM), high sun noise can make conditions very bad regardless of the DGRD.

When two different conditions are indicated for the same weekend, it means that they change from the value indicated on the left at Saturday's moonrise to the value indicated on the right at Sunday's moonset.  For instance:

Dec   07-08

Moderate -> Poor

means that on Dec, 7th Moonrise conditions are Moderate and get worse until Dec, 8th Moonset when they are Poor.
 

 
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