RF analysis and vacant FM frequencies for Alor Setar, Kedah, Malaysia

Previously I listed FM 91.5MHz, FM 91.9MHz and FM 94.3MHz as vacant frequency for Alor Setar, Kedah as FM radio transmission.

In Alor Setar, FM 91.9MHz and FM 94.3MHz are not suitable to be used in Alor Setar Tower because interference from Radio Thailand Yala FM 92MHz and 94.25MHz. For your information, Radio Thailand Yala FM 92.0MHz is high power transmitted radio station.

In fact, Radio Thailand Yala FM 92.0MHz and FM 94.25MHz are quite clear and stable in Alor Setar, Kedah, Malaysia. However, there are another two vacant FM frequencies which can be used for Alor Setar radio transmission, such as FM 91.5MHz and FM 93.7MHz.

Let's study basic RF analysis by involving existing stations.

1. FM 91.5MHz

91.3MHz: Mix FM Bukit Larut

91.5MHz: Alor Setar Tower

<200kHz, OK>

91.5MHz: Alor Setar Tower

91.7MHz: Traxx FM Bukit Palong

<200kHz, OK>

2. FM 93.7MHz

93.5MHz: Ban Mai FM Hatyai

93.7MHz: Alor Setar Tower

<200kHz, OK>

93.6MHz: Hitz FM Bukit Larut

93.7MHz: Alor Setar Tower

<100kHz, OK>

93.7MHz: Alor Setar Tower

93.9MHz: Mutiara FM Gunung Jerai (Penang only)

<200kHz, OK>

93.7MHz: Alor Setar Tower

93.75MHz: Life FM La-Ngu, Satun

<50kHz, OK>

For Alor Setar transmission on FM 91.5MHz and 93.7MHz, it is enough to use less than 500W power transmitter, meanwhile as FM 93.7MHz is closer to Mutiara FM 93.9MHz Gunung Jerai (Penang only), so the transmission power of FM 93.7MHz in Alor Setar Tower must not be more than 250W to avoid unnecessary interference.

In conclusion, as May 2020 update, FM 91.5MHz and FM 93.7MHz are the only vacant frequencies for Alor Setar Tower radio transmission. (Presumed)