EA6VQ's EME calendar for year 2013

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 EA6VQ's EME WEEKEND CALENDAR - 2013  EA6VQ's EME BEST DAYS - 2013 (DGRD < 2.0 dB)

Weekend
2013

 CONDITIONS on 144 MHz

Jan    05-06

Moderate

12-13

Moderate

19-20

Poor

26-27

Moderate - Good

Feb     02-03

Moderate

09-10

Moderate and New Moon

16-17

Poor

23-24

Good
Mar    02-03 Moderate

09-10

 Moderate

16-17

 Poor

23-24

 Good

30-31

 Moderate

Apr     06-07

Moderate - Good

13-14

Poor

20-21

Good

27-28

Moderate - Poor

May    04-05 Moderate

11-12

 Poor - Very Poor

18-19

 Good

25-26

 Poor - Very Poor

Jun    01-02

Good

08-09

 Very Poor and New Moon

15-16

 Good

22-23

 Very Poor

29-30

 Good  - Moderate
Jul    06-07 Very Poor
13-14 Good  - Moderate
20-21 Very Poor
27-28 Good  - Moderate

Aug    03-04

Very Poor

10-11

Moderate

17-18

Very Poor - Poor

24-25

 Moderate

31-01

 Poor
Sep    07-08 Moderate
14-15 Poor - Moderate
21-22 Moderate
28-29 Poor - Moderate

Oct    05-06

Moderate and New Moon

12-13

Moderate

19-20

Moderate - Poor

26-27

Moderate

Nov    02-03 Moderate
09-10 Moderate
16-17 Moderate - Poor
23-24 Moderate - Good
30-01 Moderate

Dec   07-08

Moderate - Good

14-15

Poor

21-22

Good

28-29

 Moderate

Days

 CONDITIONS on 144 MHz
Jan 01-02 Best DGRD = 1.9 dB on 01-02
Jan 27-30 Best DGRD = 1.8 dB on 27-29
Feb 23-27 Best DGRD = 1.7 dB on 24-25 (Best conditions of 2013)
Mar 23-26 Best DGRD = 1.7 dB on 23-26 (Best conditions of 2013)
Apr 19-23 Best DGRD = 1.7 dB on 22 (Best conditions of 2013)
May 18-20 Best DGRD = 1.9 dB on 19-20
Jun 27-28 Best DGRD = 1.9 dB on 28
Jul 25-26 Best DGRD = 1.8 dB on 25
Aug 21-23 Best DGRD = 1.7 dB on 21 (Best conditions of 2013)
Sep 18-19 Best DGRD = 1.8 dB on 18
Oct 01-03 Best DGRD = 2.0 dB on 01
Oct 15-17 Best DGRD = 2.0 dB on 15
Nov 11-13 Best DGRD = 2.1 dB on 11
Dec 08-10 Best DGRD = 2.0 dB on 08

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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