EA6VQ's 144 MHz EME calendar 2019

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   EA6VQ's EME WEEKEND CALENDAR - 2019    EA6VQ's EME BEST DAYS - 2019 (DGRD < 2.0 dB)
  

Weekend
2019

CONDITIONS on 144 MHz

Jan    05-06

Very poor and New Moon

12-13

Moderate

19-20

Moderate -> Good

26-27

Moderate

Feb     02-03

Very Poor -> Poor

09-10

Moderate

16-17

Moderate -> Very good

23-25

Moderate

Mar    02-03

Very Poor -> Poor

09-10

Moderate

16-17

Moderate -> Very good

23-24

Moderate

30-31

Poor

Apr     06-07

Moderate -> Poor

13-14

Good -> Excellent

20-21

Moderate -> Poor

27-28

Poor
May    04-05 Moderate but New Moon

11-12

Excellent

18-19

Moderate -> Very Poor

25-26

Poor -> Moderate

Jun    01-02

Moderate

08-09

Excellent -> Very good

15-16

Poor -> Very poor

22-23

Poor -> Moderate

29-30

Moderate
Jul    06-07 Excellent -> Very good
13-14 Very poor
20-21 Moderate
27-28 Moderate -> Poor

Aug    03-04

Excellent -> Good

10-11

Very poor

17-18

Moderate

24-25

Poor

31-01

Excellent -> Good
Sep    07-08 Very poor
14-15 Moderate
21-22 Poor
28-29 Good but New Moon on 28th

Oct    05-06

Very poor -> Poor

12-13

Moderate

19-20

Poor -> Moderate

26-27

Good but New Moon on 27th
Nov    02-03 Very poor -> Poor
09-10 Moderate
16-17 Poor -> Good
23-24 Moderate
30-01 Poor -> Moderate

Dec   07-08

Moderate -> Poor

14-15

Moderate -> Excellent

21-22

Moderate

28-29

Moderate
        

Days

CONDITIONS on 144 MHz
Jan 20-24 Best DGRD = 0.1 dB on 21st (Best conditions of 2019)
Feb 17-21 Best DGRD = 0.1 dB on 18th (Best conditions of 2019)
Mar 16-21 Best DGRD = 0.3 dB on 17th
Apr 13-17 Best DGRD = 0.6 dB on 14th
May 10-14 Best DGRD = 0.7 dB on 11th
Jun 6-10 Best DGRD = 0.6 dB on 7th
Jul 3-7 Best DGRD = 0.5 dB on 4th
Jul 31-Aug 4 Best DGRD = 0.2 dB on 1st BUT New Moon that day
Aug 27-31 Best DGRD = 0.3 dB on 29th BUT New Moon on 30th
Sep 24-28 Best DGRD = 0.4 dB on 25th BUT New Moon on 28th
Oct 21-25 Best DGRD = 0.7 dB on 23rd
Nov 17-21 Best DGRD = 0.9 dB on 19th
Dec 14-19 Best DGRD = 0.8 dB on 15th

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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