Friday, August 10, 2012

Suggestions to Radio Bangladesh Betar

        Dear colleagues,
        We appeal you to read this letter. If you agree with it, your broadcasts would have much better coverage and would be heard much better in your coverage areas. You must change your frequency policy dramatically when choosing a specific frequency.
        We think that the frequency 7250kHz is unsuitable for your broadcasts, targeted to South-East and East Asia, because PBS Xizang is broadcasting in Tibetan on the adjacent frequency of 7255kHz and after 1500UTC, China Radio International in Nepali is broadcasting on 7250. All India Radio in Persian and Malayalam is broadcasting on 7250kHz after 1615UTC and is causing a co-channel interference to your broadcasts to the Middle East. Vatican Radio on 7250kHz in Latin language is causing co-channel interference to your broadcasts, targeted to Western Europe after 1840UTC. With the help of the FIELDPLOT 8.1 software, we figured out that you must use higher frequencies for all your broadcasts, except for the programs at 1230UTC. That's why we offer you to use the following frequencies with a signal strength of about 60-70dB:

1230-1300 on 7485 DKA 250 kW / 140 deg to SEAs English
1315-1345 on 9645 DKA 250 kW / 320 deg to SoAs Nepali
1400-1430 on 9605 DKA 250 kW / 290 deg to WeAs Urdu
1515-1545 on 9700 DKA 250 kW / 305 deg to SoAs Hindi
1600-1630 on 9450 DKA 250 kW / 290 deg to N/ME Arabic
1630-1730 on 9450 DKA 250 kW / 290 deg to N/ME Bangla
1745-1815 on 15520 DKA 250 kW / 320 deg to WeEu English (Voice of Islam)
1815-1900 on 15520 DKA 250 kW / 320 deg to WeEu English
1915-2000 on 13800 DKA 250 kW / 320 deg to WeEu Bangla

Surely, these frequencies should be registered in the HFCC database.

        From 8th August, you're running test broadcasts on the frequency of 15520kHz, 1630-1730UTC for the Middle East and 1745-1900UTC and 1915-200UTC for Western Europe. However, there are several problems:
 - co-channel interference from Voice Of Turkey in English for the Middle East until 1725UTC.
 - the frequency of 15520kHz is too high for broadcasts at 1915-200UTC, that's why we suggest you to use another one (see the frequency schedule above).
 - On some days, for example on 8th August, a proble occured during your broadcasts - a strong noise, probably a problem of the transmitter. With such a noise, the broadcasts are becoming very hard to listen to, that's why you should check for a solution of the problem. However, on some days the modulation is excellent and pretty clear.

        If you agree with this corrections and suggestions, we would be pleased to see your opinion. Greetings from Bulgaria and wish health, happiness, prosperity and peace to all the sincere staff at your station.

Ivo Ivanov,
Georgi Bancov

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