EA6VQ's EME calendar for year 2012

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 EA6VQ's EME WEEKEND CALENDAR - 2012  EA6VQ's EME BEST DAYS - 2012 (DGRD < 1.5 dB)

Weekend
2012

 CONDITIONS on 144 MHz

Jan    07-08

Poor

14-15

Moderate - Good

21-22

Poor - Very Poor

28-29

Moderate

Feb     04-05

Moderate - Poor

11-12

Good

18-19

Poor - Very Poor

25-26

Moderate
Mar    03-04 Moderate - Poor

10-11

 Moderate - Good

17-18

 Moderate - Poor

24-25

 Poor

31-01

 Moderate - Good

Apr     07-08

Moderate - Good

14-15

Moderate

21-22

Poor and New Moon

28-29

Good - Very Good
May    05-06 Moderate - Good

12-13

 Moderate

19-20

 Poor and New Moon

26-27

 Good

Jun    02-03

Moderate

09-10

 Moderate

16-17

 Poor

23-24

 Good

30-01

 Poor - Moderate
Jul    07-08 Moderate
14-15 Poor
21-22 Good
28-29 Poor - Very Poor

Aug    04-05

Moderate

11-12

Poor

18-19

Good - Very Good

25-26

 Very Poor
Sep    01-02 Moderate
08-09 Poor - Very Poor
15-16 Very Good but New Moon
22-23 Very Poor
29-30 Moderate

Oct    06-07

Poor

13-14

Good - Very Good

20-21

Poor - Very Poor

27-28

Poor
Nov    03-04 Poor - Very Poor
10-11 Good
17-18 Poor - Moderate
24-25 Moderate

Dec    01-02

Poor - Moderate

08-09

Moderate

15-16

Moderate

23-23

Poor - Moderate

29-30

 Moderate

Days

 CONDITIONS on 144 MHz

Jan    10-13

Best DGRD = 1.1 dB on 11

Feb   07-10

Best DGRD = 1.0 dB on 8

Mar   05-09

Best DGRD = 0.9 dB on 6-7 (Best conditions of 2012)

Apr    02-05

Best DGRD = 1.0 dB on 3-4

Apr 29- May 02

Best DGRD = 1.2 dB on 1

May   27-30

Best DGRD = 1.5 dB on 27-30

Jun   23-25

Best DGRD = 1.6 dB on 23-25

Jul    20-21

Best DGRD = 1.5 dB on 20-21

Aug   17-18

Best DGRD = 1.4 dB (but New Moon)

Sep    13-15

Best DGRD = 1.3 dB on 13-15

Oct   11-13

Best DGRD = 1.4 dB on 11-13

Nov   9

Best DGRD = 1.5 dB on 9

Dec   4-7

Best DGRD = 1.8 dB on 4-7

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 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:

  • <1.0 dB is considered Excellent
  • 1.0 to 1.5 is Very Good
  • 1.5 to 2.5 is Good
  • 2.5 to 4.0 is Moderate
  • 4.0 to 5.5 is Poor
  • and over 5.5 is Very Poor.

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

 

 

 
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