Add REL and SDBW map examples

[skyelaird]

Analyzed VOACAP reference maps from examples/ directory and identified key parameter discrepancies between VOACAP.com and DVOACAP-Python.

Key Findings:

1. Missing bandwidth parameter - VOACAP uses mode-specific bandwidth (3/13/19/38 dB/Hz for WSPR/CW/FT8/SSB) but DVOACAP has no bandwidth parameter affecting noise calculations

2. Required SNR default too high - Default 73.0 dB causes 0-1% reliability predictions when should be 20-100%. Solution: set to mode-specific values (10 dB for SSB, 6 dB for CW, -21 dB for FT8, -28 dB for WSPR)

3. Antenna model differences - VOACAP uses HVD025.ANT @ -1° takeoff angle, DVOACAP uses generic models

4. Noise specification differences - VOACAP shows -150 dBW, DVOACAP uses man_made_noise_at_3mhz = 145.0 dB above kTB

Files Added:

• VOACAP_VALIDATION_FINDINGS.md: Comprehensive analysis document
• test_voacap_validation.py: Initial validation test script
• test_corrected_params.py: Demonstration of parameter corrections

Test Results:

• With required_snr=73 (default): 0.0-1.2% reliability (broken)
• With required_snr=10 (SSB): 82.9-95.4% reliability (realistic)
• SNR predictions: 26.2-41.5 dB (matches expected range)

Priority recommendations:

1. Add bandwidth parameter to VoacapParams
2. Implement mode preset system
3. Verify noise calculations vs VOACAP
4. Add HVD025 antenna model

Reference: examples/FN74ui 2025.11.17-*.pdf maps

Description

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Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Performance improvement
• Code refactoring
• Test coverage improvement

Related Issues

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Changes Made

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• Change 2
• Change 3

Testing

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Test Configuration

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Test Results

# Command used to test
python -m pytest tests/

# Or validation command
python test_voacap_reference.py

• All existing tests pass
• New tests added for new functionality
• Validation pass rate maintained or improved
• No performance regression

Validation Checklist

• Code follows PEP 8 style guidelines
• Docstrings added/updated for public functions
• Type hints added where appropriate
• Comments added for complex logic
• Documentation updated (README, USAGE, etc.)
• CHANGELOG.md updated
• No new warnings or errors introduced

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• Code quality is acceptable
• Tests are comprehensive
• Documentation is clear
• Validation results are acceptable
• No security issues introduced
• Backward compatibility maintained (or breaking changes justified)