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EA6VQ's 144 MHz EME calendar 2025

You could also be interested in the on-line EME calculator, the DX news and the 50 MHz EME calendar

 EA6VQ's EME WEEKEND CALENDAR - 2025    EA6VQ's EME BEST DAYS - 2025 (DGRD < 2.5 dB)

Weekend
 2025

 CONDITIONS on 144 MHz

Jan    04-05

 Good

11-12

 Poor

18-19

 Moderate
25-26 Very poor

Feb     01-02

 Good

08-09

 Poor -> Moderate

15-16

 Moderate -> Poor

22-23

 Very poor

Mar    01-02

 Very good -> Good

08-09

 Poor -> Good

15-16

 Moderate -> Poor

22-23

 Very poor

29-30

 Good but New Moon on the 29th

Apr     05-06

 Moderate -> Good

12-13

 Poor

19-20

 Very poor -> Moderate

26-27

 Good but New Moon on the 27th
May    03-04 Good

10-11

 Poor

17-18

 Very poor -> Moderate

24-25

 Good

31-01

 Very good -> Good

Jun    07-08

 Poor

14-15

 Poor -> Moderate

21-22

 Good

28-29

 Very good -> Good
Jul    05-06 Poor
12-13 Moderate
19-20 Moderate
26-27 Good

Aug    02-03

 Poor -> Very poor

09-10

 Moderate -> Good

16-17

 Moderate

23-24

 Good but New Moon

30-31

 Very poor
Sep    06-07 Moderate -> Good
13-14 Moderate -> Poor
20-21 Good -> Moderate but New Moon on the 21st
27-28 Very poor

Oct    04-05

 Good

11-12

 Moderate

18-19

 Moderate

25-26

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

Dec   06-07

 Moderate -> Good

13-14

 Moderate -> Poor

20-21

 Very poor and New Moon on the 20th

27-28

 Good
        

Days

 CONDITIONS on 144 MHz
Jan 3-6 Best DGRD = 1.8 dB on 5th
Jan 14-17 Best DGRD = 1.4 dB on 15th
Jan 31- Feb 3 Best DGRD = 1.6 dB on 1st
Feb 10-14 Best DGRD = 1.6 dB on 11th
Feb 27- Mar 3 Best DGRD = 1.3 dB on 1st BUT New Moon on 27th-28th
Mar 9-13 Best DGRD = 1.6 dB on 10th
Mar 27-31 Best DGRD = 1.3 dB on 28th BUT New Moon on 29th
Apr 5-9 Best DGRD = 1.6 dB on 7th
Apr 23-27 Best DGRD = 1.5 dB on 25th BUT New Moon on 27th
May 3-6 Best DGRD = 1.5 dB on 4th
May 21-25 Best DGRD = 1.6 dB on 22nd
May 30-Jun 3 Best DGRD = 1.2 dB on 31st
Jun 17-21 Best DGRD = 1.9 dB on 18th-19th
Jun 26-30 Best DGRD = 1.2 dB on 27th-28th
Jul 14-17 Best DGRD = 1.9 dB on 16th
Jul 24-28 Best DGRD = 1.1 dB on 25th BUT New Moon on 24th
Aug 10-14 Best DGRD = 1.8 dB on 11th-12th
Aug 20-24 Best DGRD = 1.3 dB on 11st BUT New Moon on 22nd-23th
Sep 6-11 Best DGRD = 1.6 dB on 8th
Sep 17-20 Best DGRD = 1.3 dB on 18th
Oct 4-8 Best DGRD = 1.5dB on 5th-6th
Oct 14-18 Best DGRD = 1.3 dB on 15th
Oct 31-Nov 5 Best DGRD = 1.6 dB on 2nd
Nov 10-14 Best DGRD = 1.2 dB on 11th
Nov 28-Dec 2 Best DGRD = 1.8 dB on 29th
Dec 7-11 Best DGRD = 0.8 dB on 8th Best conditions in 2025
Dec 26-29 Best DGRD = 2.2dB on 26th-27th

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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