Wireless Resources
Local Downloads & Resources
Remote Links
Microwave Propagation
Link Budget Calculation
- Can I reach an SVWUX access point?
You can make an estimate by
calculating a link budget in dBm. Sum the dB of the transmit power, antenna gains and cable losses at both ends with path loss. If your result is comfortably above -95 dBm, you have a reasonable hope of sustaining a multimegabit connection. You may fill in the form as follows:
- The SVWUX AP transmits at a net 12 dBm
- Cable loss is 4.4 dB, but net zero on transmit because we have a power amplifier which cancels out cable loss at the antenna feed
- SVWUX antenna gain is 18 dBi (The sum of the above three items will never exceed 30 dB as per Part 15 FCC Regs)
- Enter a distance at 2.8 GHz to calculate path loss
- Your FCC legal antenna gain, such as from one of these (Not an endorsement of this dealer or manufacturer.)
- Your site cable loss
- Your target receive strength for your desired bitrate. Higher bitrates demand stronger signals This Netgear Router has fairly typical receiver sensitivity and its specification sheet can be used as a rough guide to the data rate that can be expected for a given signal strength. Put that dBm value in this field and calculate your result.
Interference from obstacles or other transmitters may demand a greater cushion above the target values above. The greater your margin, the more reliable and faster will be your connection.
Links About 802.11
Software
- Kismet A cross platform, 802.11 layer2 wireless network detector, sniffer, and intrusion detection system
Radio Modulation Schemes
Links About APRS
Links About AX.25
Free Space Optical Technology
Battery Technology
Advanced RF Calculations
- Splat! An RF Signal Propagation, Loss, And Terrain analysis tool for the spectrum between 20 MHz and 20 GHz
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