eTools - Broadcasting planning tools.
Central and America region, the tool to be used is CA_compat.
CA_compat is a compatibility analysis tool, developed by the Radiocommunication Bureau, for parts of Region 2 including Central America and Caribbean countries. This tool, based on the software used at the RRC06 Conference and still in use for compatibility analyses in GE06 planning area, is intended to facilitate the planning of digital television assignments in the frequency bands 174-216 MHz and 470-698 MHz for Central American and Caribbean countries.
CA_compat is being developed gradually to take into account existing analogue and digital television assignments as well as frequency assignments to other primary services recorded in the MIFR in the above-mentioned frequency bands. It is based on the sharing and compatibility criteria of the digital frequency requirements contained in the relevant ITU-R Recommendations and Reports, mainly : Recommendations ITU-R BT.1368, ITU-R BT.2033, ITU-R BT.2036, ITU-R BT.655 and Reports ITU-R BT.2254, ITU-R BT.2383 as well as on assumptions made for the missing criteria:
- The technical parameters used in the compatibility analyses and submitted to ITU-R WP 6A for approval/revision, can be found at https://www.itu.int/md/R15-WP6A-C-0237/en .
- The propagation prediction model implemented by the Bureau is using the method described in Recommendation ITU-R P.1546-5, noting that it is valid only between 1% and 50% time probability. For 90% of time (needed for planning ATSC and ISDB‑T standards), the Bureau implemented the formula described in Report ITU-R BT.2383-1 (Note 19 on page 26) assuming that Recommendation ITU-R P.1546 can be applied also for 90% of time. For clarification, the Bureau also sent a Note to ITU-R WP 3K on this issue. This document can be found at: https://www.itu.int/md/R15-WP3K-C-0159/en
CA_compat does not use the Digital Terrain Model. However, the calculations are taking into account propagation conditions along the entire path between the transmitter and the receiver (land, sea, mixed) in accordance with the IDWM as well as the effective antenna height, which represents the height of the transmitting antenna above terrain height averaged between distances of 3 to 15 km, in the direction of the receiving antenna (SRTM: http://www.itu.int/SRTM3/index.html ).
- Software to read and analyze the results of the compatibility analysis done by CA_compat
SRTM3 - Online calculations of antenna effective height using data from publicly available SRTM3 digital terrain model.