Mobile propagation measurements with low antennas for segmented wideband communications at VHF
Bibliographic record
Abstract
This paper reports propagation characteristics estimated from quasi-simultaneous channel measurements centered at the VHF frequencies 37.8, 57.0, and 77.5 MHz. The measurement experiments were conducted with low antenna heights (2 m) for both the base and mobile terminals and are therefore considered applicable to tactical and emergency communication scenarios. Multipath-induced time dispersion and fading are characterized respectively by root mean square (rms) delay spread and Ricean K ratio. For the area surveyed, rms delay spreads ranged from a few tens of ns to 2 μs and tended to increase with transmitter to receiver separation. Fading was predominantly Ricean rather than Rayleigh, and its severity was highly correlated with delay spread. A joint comparison of various propagation characteristics over frequency indicates a high degree of correlation between the three bands.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".