1 Another Way to View Propagation Predictions for DXing and Contesting By R. Dean Straw, N6BV Senior Assistant Technical Editor, ARRL April 22, 2006 International DX Convention Visalia, CA
2 I will talk about the following: Area-coverage predictions using VOAAREA. I will compare VOAAREA predictions to actual results for the 2005 Sweepstakes Phone contest. I will discuss how to make customized antennas for VOAAREA.
3 The VOAAREA Program VOAAREA is one of the programs in the software suite that come with VOACAP. VOAAREA creates customizable contours on several selectable map projections. One of the key parameters is setting the antenna properly, for both receiver and transmitter.
4 Table of Sigs/Elevs -- Chicago 04 = Zone, Nov., CA (San Francisco) to IL (Chicago), SSN = Very Low, S-Units GMT Sig Elev Sig Elev Sig Elev Sig Elev Sig Elev Decent 15 meter opening predicted Some 10 meter signals predicted I ve presented this tabular format in various forums in the past.
5 Table of Sigs/Elevs East Coast 05 = Zone, Nov., CA (San Francisco) to Washington (D.C.), SSN = Very Low, S-Units GMT Sig Elev Sig Elev Sig Elev Sig Elev Sig Elev No 10 meters 15 meters doesn t last long
6 Traditional Summary, All Bands San Francisco to Rest of USA, November 2005 SS Signal, S-Units MHz W3 14 MHz W3 21 MHz W3 7 MHz W9 14 MHz W9 21 MHz W Nighttime Time, UTC Daylight Complicated, isn t it??
7 Coverage Most Populous Areas US Census 2000 Data
8 Coverage Most Populous Areas Midwest East Coast
9 Sweepstakes 2005 Modeling Assumptions for VOAAREA Antennas: 3-element Yagi at 55 feet over flat ground for 20, 15 and 10 meters. Antennas for 40 and 80 meters: Dipoles at 75 feet over flat ground. Antenna are a little smaller than my usual assumptions but represent realistic stations W of RF power. Very Low SSN = 10.
10 80-Meter Coverage Unless you have really big antennas on 80 meters, this band can be very challenging in Sweepstakes from California. Particularly to the East Coast. The area coverage plots that follow are centered on Chicago, Washington (DC) and San Francisco.
11 W9 is very strong in the populous areas of USA on 80
12 W3 is very strong in the populous areas of USA on 80
13 W6 is not strong in the most populous areas on 80
14 40-Meter Coverage Bigger antennas help on 40 meters (although dipoles don t do badly). Big antennas are needed on phone, especially to run the East Coast. QRO is important for rate on 40. There are times when the East Coast and Midwest go long skip and then Californians can have some advantages.
15 W9 has skip zone in Midwest on 40 in the evening
16 W3 has skip zone in mid East Coast on 40 in the evening
17 W6 can cover W3 and W9 skip zones on 40 meters
18 40-Meter Movie Sequence From 23 UTC to 12 UTC (late afternoon to East Coast sunrise). Assumes 75-foot high 40-meter dipoles. Assumes 1500 W.
20 N6BV 2005: 0 Qs Los Angeles coverage is good at this time
21 2005: 59 Qs Los Angeles coverage beginning to go long
22 2005: 87 Qs Skip is long to southern California
23 2005: 68 Qs This hole in single F2 hop coverage is caused by the very low angles needed
24 2005: 47 Qs Midwest hole widens
25 2005: 53 Qs Hole begins to shrink
26 2005: 72 Qs
27 2005: 37 Qs
31 Midwest coverage begins to break up
32 East Coast sunrise CA is still strong here
33 20-Meter Coverage 20 is usually a zoo on phone, particularly during low part of Solar Cycle, when 15 and 10 meters are marginal or non-existent. Big stacks rule, although 1500 W and a 3- element Yagi can easily run rate. Moral of this story: Run QRO if you possibly can, with big antennas!
34 W9 has big skip zone in Midwest & East Coast on 20 meters in the afternoon
35 W3 has big skip zone on East Coast & Midwest on 20 meters in the afternoon
36 W6 covers Midwest and East Coast on 20 in the afternoon
37 20-Meter Movie Sequence From 13 UTC to 02 UTC (W6 sunrise to evening) Assumes 3-element Yagis at 55 feet. Assumes 1500 W.
50 2005: 24/0 Qs Propagation gets a little better for a while in Midwest
51 2005: 0/0 Qs Goodnight, 20 meters
52 15-Meter Coverage During low portion of Solar Cycle, 15 meters will be reasonably good to Midwest, but marginal to East Coast. Big stacks help, of course, but relatively modest 15-meter beams can do well on 15.
53 W9 has huge skip zone on 15 meters covering Midwest and East Coast
54 W3 also has huge skip zone on 15 meters for the Midwest and East Coast
55 W6 covers Midwest well on 15 in late morning but not well to East Coast
56 15-Meter Movie Sequence 14 to 01 UTC (W6 sunrise at at 1443 UTC to sunset at 0103 UTC). Assumes 3-element 15-meter Yagis at each end at 55 feet. Assumes 1500 W.
57 N6BV 2005: 1 Q Band opens to the SE into Texas
58 2005: 4 Qs Opening to Midwest
59 2005: 46 Qs
60 2005: 53 Qs S5 to East Coast
61 2005: 65 Qs S7 in New England and Florida
62 2005: 25 Qs
63 2005: 97/1 Qs Midwest is best place where there s some action
64 2005: 90/0 Qs
65 2005: 0/0 Qs Fading even in Midwest
66 2005: 0/0 Qs Fading
67 2005: 0/0 Qs Gone
68 What About Power? Compare area-coverage plots for 20 meters at 18 UTC for 100 W and for 1500 W. And what about QRP?
69 1500 W gives S9 out to mid Ohio
70 For 100 W, S9 out to almost Kansas
71 For QRP, S7 out almost to Kansas
72 Omnidirectional Antennas The plots here have assumed omnidirectional antennas, a misnomer. This assumes that a directional antenna can actually be pointed at azimuth angles of interest. For flat terrain, I model antennas with EZNEC and then convert to 2D VOAAREA type *.11 files using MultiNEC by AC6LA. For complex terrains, I use HFTA and convert to a 2D VOAAREA *.11 file using MAKEVOA.
73 Antenna pattern is omnidirectional (propagation is not )
74 Customizing for Your Antennas What kind of area coverage do you get for your own antennas? I am very fortunate to use the super station at N6RO for Sweepstakes Phone. N6RO has Yagi stacks on 10, 15, 20 and 40 meters. These have significantly more gain than the 3-element Yagis in the previous plots.
75 Customizing for Your Antennas Directional patterns only work for flatground terrain presently. I model 3D type *.13 azimuth/elevation patterns using MultiNEC by AC6LA with EZNEC.
76 Customizing for Your Antennas This shows pattern of 40-meter stack at N6RO pointed at 70
77 40-Meter Stack at N6RO This is the only way to take down two 4L40 Yagis and replace them with two new M 2 ones in one day! 35 ton crane with 145 reach N6RO, Oct 3, 2005
78 Planning for a Contest The following shows a few slides from a movie I made for myself to guide my band-changing decisions for the 2005 ARRL Sweepstakes phone contest. The number of QSOs made in the 2005 SS Phone contest are listed as well.
79 20 m = 150 Qs 15 m 23 UTC 40 m
80 20 m = 124 Qs 15 m 00 UTC 40 m
81 20 m = 24 Qs 15 m 01 UTC 40 m = 59 Qs
82 How Did Predictions Compare With Reality? 21 UTC on 15 Meters, N6RO Antennas November 2005 Sweepstakes
83 Actual QSOs by N6BV in 2005 SS Phone, 21 UTC on 15 Meters This format was generated using DX Atlas; courtesy K6TA/K6KO
84 Prediction 15 m 21 UTC Actual
85 20 m 22 UTC
86 Low-Freq. Problems in VOACAP Since 6/2/1999 VOACAP has produced signal predictions lower than its predecessor IONCAP on bands lower than 40 meters. The problem lies in a change in calculations made then for the loss through the E layer. VOA has no validation data below 5 MHz because they had no stations there. CAPMan does produce more believable lowfrequency computations, but source code is gone.
87 Comparing Versions of VOACAP Version About 18 db difference on 80 meters for I version (standing for IONCAP). I use CAPMAN for my propagation tables
88 80 meters, after 6/2/99 Pre 6/2/99 Stronger signals into Europe are more believable from experience, ( I version).
89 Low-Freq. Problems in VOACAP Even after retiring from government service, Greg Hand and George Lane, the people who helped develop VOACAP, have continued its development. Bless them! Greg will soon be posting a version of a new VOACAP/VOAAREA that includes the I option.
90 In Conclusion I ve demonstrated some intuitive areacoverage predictions using VOAAREA. I have also touched on how to make customized antennas for VOAAREA. And by the way, the plots shown here involve a great deal of graphical manipulation by hand!
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