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Keep the band when the frequency is past the edge

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Contest operating goes outside the band edges. Someone answers a CQ at 14352, or
a radio reports a frequency a few hundred hertz off, and Bands.ForFrequency
returned null: the contact scored nothing, missed the per-band dupe check and
exported with no band.

N1MM buckets a frequency by its whole megahertz — its BandFor divides the
kilohertz by 1000 and switches on the result, with 1 and 2 both 160M, 3 and 4
both 80M, 28 and 29 both 10M — and never looks at a band edge. Same rule here,
except that the real edges are checked first: 2190M and 630M are both under
1 MHz and share the bucket, so nothing else can tell them apart. A frequency
under 1 MHz that misses both edge ranges still has no band, as it does in N1MM.

The bandmap clamped its slice to the band edges, so a radio past the edge left
the receiver bar off the top of the scale. The slice now stretches to wherever
the radio is.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
ericek111
2026-08-27 23:01:39 +00:00
parent d375d86466
commit e6d0b58305
4 changed files with 65 additions and 6 deletions
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12
src/Nonemm.App/Windows/BandmapWindow.axaml.cs
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@@ -94,16 +94,20 @@ public sealed partial class BandmapWindow : RefreshableWindow
return markers;
}
/// The slice to show, centred on the receiver and kept inside the band.
/// The slice to show, centred on the receiver. Contest operating goes
/// outside the band edges, so the slice stretches to wherever the receiver
/// is rather than leaving it off the top of the scale.
private (Frequency Low, Frequency High) Window(Band band, Frequency centre)
{
long lowEdge = Math.Min(band.Low.Hertz, centre.Hertz);
long highEdge = Math.Max(band.High.Hertz, centre.Hertz);
Frequency span = Spans[Math.Max(0, SpanBox.SelectedIndex)].Span;
if (span.Hertz == 0 || span.Hertz >= band.High.Hertz - band.Low.Hertz)
if (span.Hertz == 0 || span.Hertz >= highEdge - lowEdge)
{
return (band.Low, band.High);
return (Frequency.FromHertz(lowEdge), Frequency.FromHertz(highEdge));
}
long half = span.Hertz / 2;
long low = Math.Clamp(centre.Hertz - half, band.Low.Hertz, band.High.Hertz - span.Hertz);
long low = Math.Clamp(centre.Hertz - half, lowEdge, highEdge - span.Hertz);
return (Frequency.FromHertz(low), Frequency.FromHertz(low + span.Hertz));
}