Wednesday 27 May 2020

Can Malaysia (North Kedah and East Perlis) receive Thailand DAB+ radio from Songkhla?

Nearby Malaysia border, there is Thailand DAB+ radio trial transmission in Songkhla province, transmitted from Khao Kho Hong (Hat Yai) on the Channel 9C (VHF 206.352MHz) and 9D (VHF 208.064MHz).

A question here. Can Malaysia bordering areas such as North Kedah (Bukit Kayu Hitam and Changlun) and East Perlis (Chuping and Padang Besar) receive Thailand DAB+ radio stations from Khao Kho Hong, Songkhla?

Let's find out by showing Nautel RF Toolkit map with inserting some technical data from NBTC official website.



==Parameter of Thailand DAB+ in Songkhla==
- Frequency: VHF 206.352MHz (CH 9C) & VHF 208.064MHz (CH 9D)
- ERP: 200W (CH 9C) & 100W (CH 9D)
- Transmission site: Khao Kho Hong, Hat Yai, Songkhla province, Thailand
- GPS Coordination: 7.037696N, 100.518640E
- Antenna height: 80m
- Receiving antenna height: 10m

Khao Kho Hong tower (Hat Yai park side)


For the field strength, the minimum is 42dBuV/m for DAB+, compare to 30dBuV/m for FM transmission.

Here is the exact coverage of DAB+ trial transmission in Songkhla at maximum ERP 200W.


According to the coverage map which generated via Nautel RF Toolkit (presumed only), with the parameter of DAB+ transmission in Songkhla, Thailand at 200W ERP, Malaysia areas (North Kedah and East Perlis) cannot receive Thailand DAB+ stations from Khao Kho Hong, unless operates at 1kW transmitter power with 4.3dBd antenna (result 2.7kW power), so DAB+ from Thailand could be received in East Perlis and North Kedah of Malaysia, but weaker signal (42-59 dBuV/m).

If I increase the transmission power of DAB+ radio station, here are the coverage.




If I compare with FM radio coverage of Khao Kho Hong at 1kW, North Kedah and Perlis can receive it, but I can't receive the transmission on DAB+ platform. This is because FM and DAB+ operate at different frequency band, FM is on VHF Band II, meanwhile DAB+ is on VHF Band III, so DAB+ frequency is higher than FM, the coverage of DAB+ is smaller than FM.

In conclusion, for current situation, North Kedah and East Perlis of Malaysia cannot receive Thailand DAB+ radio from Songkhla (Khao Kho Hong) due to low ERP.

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