rouggy
025472820b
A 2 m opening was announced at 9650 km towards Japan. The callsigns gave it away — 7M4RRM, JA7RPC, JF1AWC — all working EME, which is routine on 2 m and reported to PSK Reporter like anything else. Real contacts, real grids, and no evidence whatsoever about the band: an operator turning a beam on that bearing would hear nothing. Removing the flat 2400 km ceiling was right; it threw away genuine multi-hop Es on 6 m. "No limit anywhere" was the overcorrection. The limit is per band now, and it is physics rather than a threshold: 2 m reaches a few thousand kilometres by tropospheric duct or a chain of Es clouds and no further, so 3500 km, and 4 m 4000. Six and ten metres keep no ceiling — multi-hop Es and F2 genuinely do go round the world, which is the case that started all this. Pinned from both sides: the 9650 km Japanese burst produces nothing, and a 2000 km 2 m burst in one sector still counts.
52 lines
1.6 KiB
Go
52 lines
1.6 KiB
Go
package bandopen
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import (
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"testing"
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"time"
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)
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// A 2 m "opening" was announced at 9650 km towards Japan on stations that were
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// plainly working EME. The moon is not an opening: an operator pointing an
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// antenna at that bearing finds nothing.
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func TestEMEIsNotAnOpeningOnTwoMetres(t *testing.T) {
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d := New(DefaultConfig())
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base := time.Date(2026, 8, 12, 6, 0, 0, 0, time.UTC)
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for i, call := range []string{"7M4RRM", "JA7RPC", "JF1AWC", "JK1TPA", "JH1JCQ"} {
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if op := d.Add(Spot{
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Call: call, Band: "2m", DistKm: 9650, Bearing: 40 + i*3,
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At: base.Add(time.Duration(i) * time.Minute),
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}, 47.0); op != nil {
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t.Fatalf("a 9650 km 2 m path was announced as an opening: %+v", op)
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}
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}
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}
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// But a real 2 m opening — an Es chain at a plausible distance — must survive.
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func TestLongButPlausibleTwoMetresStillCounts(t *testing.T) {
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d := New(DefaultConfig())
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base := time.Date(2026, 6, 20, 18, 0, 0, 0, time.UTC)
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var got *Opening
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for i, call := range []string{"EA1AA", "CT1BB", "EA7CC", "CT7DD"} {
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if op := d.Add(Spot{
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Call: call, Band: "2m", DistKm: 2000 + i*30, Bearing: 200 + i*4,
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At: base.Add(time.Duration(i) * time.Minute),
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}, 47.0); op != nil {
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got = op
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}
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}
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if got == nil {
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t.Fatal("a 2000 km 2 m burst in one sector was not reported")
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}
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}
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// Six metres keeps no ceiling: multi-hop Es genuinely goes that far, which is
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// why the flat limit was removed in the first place.
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func TestSixMetresHasNoCeiling(t *testing.T) {
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if MaxKmFor("6m") != 0 || MaxKmFor("10m") != 0 {
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t.Error("6 m and 10 m must have no distance ceiling")
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}
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if MaxKmFor("2m") == 0 {
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t.Error("2 m must have one")
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}
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}
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