EA6VQ's 50 MHz EME calendar 2023

You could also be interested in the on-line EME calculator, the DX news and the 144 MHz EME calendar

 EA6VQ's EME WEEKEND CALENDAR - 2023    EA6VQ's EME BEST DAYS - 2023 (DGRD < 2.5 dB)

Weekend
 2023

 CONDITIONS on 50 MHz

Jan          01

 Poor

07-08

 Poor -> Moderate

14-15

 Poor -> Moderate

21-22

 Moderate BUT New Moon on 21st
28-29 Poor

Feb     04-05

 Moderate -> Good

11-12

 Poor

18-19

 Moderate

25-26

 Poor

Mar    04-05

 Moderate

11-12

 Poor

18-19

 Moderate -> Good

25-26

 Poor

Apr     01-02

 Good -> Moderate

08-09

 Poor

15-16

 Moderate -> Good

22-23

 Poor -> Very poor

29-30

 Good -> Moderate
May    06-07 Poor -> Very poor

13-14

 Moderate -> Good

20-21

 Poor -> Very poor and New Moon on 20th

27-28

 Moderate

Jun    03-04

 Poor -> Very poor

10-11

 Good

17-18

 Very poor and New Moon

24-25

 Moderate
Jul    01-02 Very poor
08-09 Good
15-16 Very poor -> Poor
22-23 Moderate -> Poor
29-30 Very poor

Aug    05-06

 Good -> Moderate

12-13

 Very poor -> Poor

19-20

 Moderate -> Poor

26-27

 Very poor -> Poor
Sep    02-03 Good -> Moderate
09-10 Poor -> Moderate
16-17 Poor
23-24 Very poor -> Moderate
30-01 Good -> Moderate

Oct    07-08

 Poor -> Moderate

14-15

Poor and New Moon

21-22

 Poor -> Moderate

28-29

 Moderate
Nov    04-05 Moderate -> Good
11-12 Poor
18-19 Moderate
25-26 Moderate -> Poor

Dec   02-03

 Good

09-10

 Poor

16-17

 Moderate

23-24

 Poor

30-31

 Good
        

Days

 CONDITIONS on 50 MHz
Jan 8-9 Best DGRD = 2.3 dB on 9th
Jan 23-25 Best DGRD = 1.7 dB on 24th
Feb 5 Best DGRD = 2.3 dB on 5th
Feb 20-22 Best DGRD = 1.5 dB on 20th BUT New Moon on 20th
Mar 4-5 Best DGRD = 2.2 dB on 4th
Mar 14-17 Best DGRD = 1.8 dB on 14th
Mar 20-22 Best DGRD = 1.7 dB on 20th-21st  BUT New Moon on 21st
Mar 31-Apr 2 Best DGRD = 2.2 dB on 31st
Apr 16-18 Best DGRD = 1.9 dB on 17th
Apr 28 Best DGRD = 2.3 dB on 28th
May 13-15 Best DGRD = 2.1 dB on 14th
May 25-26 Best DGRD = 2.2 dB on 25th
Jun 10-11 Best DGRD = 2.0 dB on 10th
Jun 21-22 Best DGRD = 2.2 dB on 21st
Jul 6-9 Best DGRD = 1.7 dB on 7th
Jul 19 Best DGRD = 2.3 dB on 19th
Aug 2-5 Best DGRD = 1.6 dB on 4th
Aug 15 Best DGRD = 2.3 dB on 15th BUT New Moon
Aug 30-Sep  2 Best DGRD = 1.4 dB on 31st (Best day of 2023)
Sep 11 Best DGRD = 2.3 dB on 11th
Sep 26-30 Best DGRD = 1.5 dB on 28th
Oct 9 Best DGRD = 2.3 dB on 9th
Oct 24-26 Best DGRD = 1.7 dB on 25th-26th
Nov 5-6 Best DGRD = 2.1 dB on 5th
Nov 20-22 Best DGRD = 2.0 dB on 121st-22nd
Dec 2-3 Best DGRD = 2.2 dB on 2nd-3th
Dec 18-19 Best DGRD = 2.0 dB on 18th-19th
Dec 29-31 Best DGRD = 2.0 dB on 29th

 

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 50 MHz and New Moon. Conditions may be worse, due to ionospheric disturbance, local noise and polarity, but not better than indicated.

In general, 50 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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