HFCC - International Broadcasting Delivery

Conferences and On-line Co-ordination

The close co-operation of all participants from the very beginning and further improvements of working methods had shown that the management of all frequency requirements in one single, global database was realistic. At present about 85 percent of the overall amount of global shortwave frequency requirements used for broadcasting is kept in this database. The missing 15 percent comprises some smaller stations in Africa and Latin America, as well as stations in the so called tropical broadcasting zone that employ shortwave transmissions for local listeners and are not interested in international co-ordination.

Face-to-face conferences facilitate the resolution of thousands of frequency collisions that are detected in the schedules at the start of every season. Informal personal contacts are established and they are extremely useful for effective and amicable agreements on the resolution of incompatibilities. Unfortunately some parts of the shortwave spectrum are so overloaded that a complete solution of all problems during a conference is only rarely reached. This is one of the reasons why co-ordination has to be ongoing.

Tools for ongoing co-ordination after - and during - the periods between conferences have been developed over the years. An automatic web-based system of processing and identification of collisions in seasonal databases is in place. It is located on the HFCC server and available to all co-ordinators. The results of the schedule updates and of new frequency submissions can be viewed by all, as soon as each of a number of processing cycles is finished. An automated system checks for any changes or additions every ten minutes. If any changes or additions are detected, the processing then starts automatically, and amends the database as well as the lists of frequency incompatibilities or "collisions".

The ongoing, web-based processing is especially useful for the members in the Asia-Pacific region for example. They organise e-mail co-ordination meetings for the "B" seasons of the year and they can use the on-line system for the solution of frequency incompatibilities. The flexibility of this system is beneficial for yet another reason: the possibility of updating frequency schedules at any time during a given season makes the existence of so-called "wooden", or reserve, frequencies that complicate co-ordination, completely unnecessary.

Another co-ordination feature that improved the accuracy of the frequency collision calculations was introduced in 2008. Software has been developed that is based on a direct comparison of signal-to-interference values calculated for every test point in each Ciraf zone of world broadcasting and for every hour of the transmission that is involved in a given frequency collision.

The severity of the collision is graded as a result of this. This can be useful during the the conferences for example, and co-ordinators are able to address the most important collisions first. The feedback has already indicated that the new method is capable of discovering hidden collisions undetected by the old system while some of the less severe collisions were left out.

What's New

[7-Jun-2024] - B24 upload opened. Please review and confirm your contact details prior to uploading the initial version of your B24 data.

[29-May-2024] - Questionnaire on Capacitors - please respond by 15 July 2024. Please, kindly submit the simple form repeatedly for every capacitor type you use.

[26-Feb-2024] - A24 plenary minutes

[5-Feb-2024] - ITU-BR Circular Letter CR/501 containing closing dates for receipt of ITU HFBC A24 and B24 schedules, info on coordination meetings in 2024/2025, IRDR and the new eHFBC platform

[28-Dec-2023] - IMPORTANT: New requirement for foreign citizens entering Malaysia effective January 1, 2024

[11-Dec-2023] - A24 upload opened. Please review and confirm your contact details prior to uploading the initial version of your A24 data.

[13-Nov-2023] - A24 registration and hotel booking opened on the A24 Conference Webpage in the Member's Area

[13-Nov-2023] - eHFBC - new ITU online platform for HF broadcasting

[30-Oct-2023] - B23 GOE report

[20-Oct-2023] - B23 plenary minutes

[9-Oct-2023] - B23 operational data snapshot

[10-Aug-2023] - Follow up on the questionnaire on transmitter tubes and table by CPI

[8-Aug-2023] - B23 initial tentative data snapshot

[26-May-2023] - Encompass Digital Media Ltd are broadcasting Democratic Voice of Burma (DVOB) 1230-1300 UTC (daily) from Dhabayya utilising IRDR frequency 21840kHz transmitting from 29th May for approximately 1 month, providing special programming to Myanmar in response to the recent cyclone

[20-May-2023] - Sad news about Tom Lucey

[5-May-2023] - Summary of the questionnaire on transmitter tubes. The Questionnaire remains open for further responses

[5-May-2023] - Steps to apply for standard (non-ETA) visa added to the B23 webpage

[1-May-2023] - Encompass Digital Media Ltd are broadcasting Agricultural Voices Syria 0300-0330 UTC (weekdays) from Dhabayya utilising IRDR frequency 11840kHz transmitting from 24th April for 2 weeks of special programming educating farmers on how to grow and manage crops within the disaster zone

[9-Mar-2023] - Deadline for answering the Questionnaire on Transmitter Tubes has been extended

[1-Mar-2023] - A23 GOE report

[28-Feb-2023] - A23 plenary minutes

Archive of Earlier News Items

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