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nyan:link_budget

Link Budget

PRX=PTXLTX+GTXLfreespaceLmisc.propagationLpolarisation+GRXLRX

Polarisation loss from heal can be calculated. It might also be worth working out losses due to heal and aerial directivity.

Free space loss

Distance (km)	Distance (nautical miles)	Frequency (MHz)		Loss (dB)	Fresnel r (m)
1		0.54				434			-85.2		13.1
1		0.54				869			-91.2		9.3
10		5.40				434			-105.2		41.6
10		5.40				869			-111.2		29.4
20		10.80				434			-111.2		58.8
20		10.80				869			-117.2		41.5
30		16.20				434			-114.7		72.0
30		16.20				869			-120.8		50.9
40		21.60				434			-117.2		83.1
40		21.60				869			-123.3		58.7
50		27.00				434			-119.2		92.9
50		27.00				869			-125.2		65.7
60		32.40				434			-120.8		101.8
60		32.40				869			-126.8		71.9

Bibliography

nyan/link_budget.txt · Last modified: 2023/12/11 14:13 by river

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