300 Mbps Outdoor Wireless Bridge. 4.9 GHz to 5.8 GHz Fixed and Mobile Wireless Outdoor Bridges for voice, data and video distribution. Proven, reliable and fast outdoor wireless video solutions for ITS, transportation, and Surveillance Applications. Have a Question? Ask an Expert
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Step 1: Check the distance (path) between locations to make sure "Fade Margin" is acceptable.  Change the "Path Length" value to start.  Use the "Tab" key to move between fields and update values.  Grey fields are calculated values.  Pressing "enter" will refresh (clear) the page. Note: Internet Explorer recommended for this VB Script application.  Longest active production WirelessGRID link - 62 miles (100km) with 6 foot parabolic dishes
1a. Enter Path Length in miles
     miles  =    km
1b. Select Frequency (GHz)
 
Free Space Path Loss (dB)
2. Select Radio Output Power (dBm) - Select the transmit power setting for both ends of the link.  "Local regulatory compliance required."
3. Select Radio Receiver Sensitivity (dBm) - Add range by selecting a higher sensitivity rate.  Higher negative values go farther, but at a reduced rate.
4. Select Antenna Gain (dBi) - Select the apropriate antenna gain (power) from available antenna options.
Free Space Receive Signal Level (dBm) - Calculation for the techies.
Effective Isotropic Radiated Power (EIRP) Note: EIRP varies by regulatory domain. Check with local regulatory authority for maximum EIRP allowed.
5. Review Fade Margin in dB - This value should not be less than 10 for a quality link. Higher values are better.
You should also check for path clearance of link by clicking here when you are done checking distance above. AIRAYA also recommends that you use a tool such as DUMeter to test your link for actual TCP/IP throughput.  It has a great graphical display, makes testing link speed and viewing results a very simple task, and is very low cost (approx. $20.00). 

Step 2 (optional) : When purchasing radios with N-Type Connectors, you'll need to do these additional calculations:
Length of cable between the antenna and radio bridge unit (ft.)
Cable loss (dB/100 ft) - The cable manufacturer will specify loss based on lengths of cable.
Total cable loss based on length of cable and dB loss/100 ft (dB)
Estimated Connector loss (dB) -Add .3 dB for each connector on external cables.
Divider and Combiner Loss (dB)  optional.  For international use only
Diffraction Loss (dB)Optional - Enter additional loss in dB here
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