Difference between revisions of "Pathloss 5 - Revision history"

Revision as of 13:09, 12 May 2009

Pathloss 5 - revision date May 7, 2009

Create PTP and PTMP links

Clearance has been added as a rejection criteria. This is the clearance relative to the clearance criteria. A value of 0 means that the clearance criteria has been exactly met. A positive value is the excess clearance over the clearance criteria. A negative value is the additional clearance required to meet the clearance criteria.

A minimum and maximum value can be specified for each rejection criteria. In addition, the current link display can be saved to a group. This makes it possible to save the analysis into multiple groups. For example the group names could be as follows:

 clearance OK
 clearance within 10 meters
 clearance over 10 meters

The links can be saved with the original color legend.

Point to point equipment parameters now used the same standard data entry forms used in the transmission analysis section and include both lookup tables and the radio - antenna indexes.

Automatic Link Design

Diffraction loss is calculated at three values of K (4/3, the minimum expected value of K and a K of infinity). The infinity value was used in the transmission analysis under the assumption that heavy multipath fading is coincident with high values of K.

In this program build, the 4/3 value is used. Future program builds will expand on this and provide the probability of obstruction fading.

Lookup tables

Various data entry and conversion problems with antenna and radio data lookup tables were corrected dbm to microvolt conversion on the land mobile radio data entry form did not operate.

Pathloss 5 - revision date April 22, 2009

Multipath - reflection

Variable parameters calculations using ray tracing did not correctly save in the pl5 file.

Variable parameters calculations using ray tracing on paths which were blocked at the lowest value of the earth radius factor K could cause a program crash.

Transmission analysis

The vertical angle and azimuth were expressed as degrees minutes and seconds in report. The vertical angles were reported as positive values. These are now expressed as decimal degrees with the correct sign

The report format options for microwave total time below level showed the annual rain unavailability and the total annual rain + multipath unavailability in expressed in seconds. The actual report expresses the value in minutes. This provides compatibility with ITU conventions of expressing unavailability in minutes.

Loading a radio data file could could change several of the calculations options. These changes have been inhibited for the time being. The radio data files contain calculation methods such as selective outage and performance calculations in accordance with G826. A future release will prompt the user to make these changes and the changes will be immediately reflected in the radio data entry form.

FCC EIRP warnings were based on dBm instead of dBW

Vectors

A side effect of continuing development on shapefile features resulted in program crash when using vector shapefiles

Network display link list

If the link list was closed with the last row selected, the program would crash

Pathloss 5 - revision date March 26, 2009

Site list

Corrections made to the import/export CSV files operations.

Corrections made to column sorting.

Automatic link design

Antenna height greater than the tower height link rejection criteria has been added.

Tower heights have been added to the CSV report.

Finalize links did not correctly limit antenna heights to the tower heights

Diffraction module

Under some circumstances Fresnel zones could not be displayed.

Reports

This section is now under revision. The version 4 print profile report has been added.

Pathloss 5 - revision date March 10, 2009

Radio lookup tables can load version 4 microwave (mrd) and VHF-UHF (vrd) lookup files.

CSV Link reports have been added. They can be found under the Operations menu in the network display. The report can be customized by clicking the 'Edit' button and selecting CSV Link report from the dropdown list in the report settings window. (More report settings are available in the tree list on the left.)

Pathloss 5 - revision date February 24, 2009

Radio lookup tables

This has been added as an option to using the radio code index. If a code exists in the table, the, lookup table functions the same as the radio code index.

Other fixes

Loading pl4 files which contained Fresnel references became corrupted when saved as PL5 files.

Interference calculations for base stations without associated links has been implemented.

Pathloss 5 - revision date February 12, 2009

Base station sector frequency assignments

The TX channel table and frequency plan files are now used for frequency assignments.

Point to multipoint design

The base antenna height is not considered in the rejection criteria.

Google Earth kml export

General improvements to the overall display. Local and area studies are now exported as separate entities for each signal level.

Other fixes

Metric conversion problems - (feet and miles only).

Error in transmission line unit loss in ptmp link design corrected.

Error in tower heights corrected.