FM 97.5MHz radio station signal is active in Kota Bharu, Kelantan, Malaysia, but no audio is carried. From Thailand or Malaysia?

Based on this video, FM 97.5MHz signal is detected in Kota Bharu,  Kelantan, Malaysia, but no audio is carried.

In addition, FM 97.5MHz is appeared its RDS information with "TEST RDS". 

Photo credit to Senn Lens Facebook

Regarding FM 97.5MHz unknown radio station detected in Kota Bharu, Kelantan, Malaysia, I strongly believe it is a Thailand radio station testing the frequency, instead of Malaysia radio station.

If I say that FM 97.5MHz is belonged to Malaysia radio station, it will cause interference to Kelantan FM 97.3MHz Bukit Bakar coverage as FM 97.3MHz covers most of Kelantan areas including Kota Bharu.

==RF analysis of FM 97.5MHz if the frequency is belonged to Malaysia==

97.3MHz: Kelantan FM Bukit Bakar

97.5MHz: Telipot

<200kHz, not ok>

97.5MHz: Telipot

97.5MHz: Sinar FM Bukit Besar

<0kHz, not ok. Minimum is 100kHz>

97.5MHz: Telipot

97.8MHz: Ai FM Bukit Bintang

<300kHz, OK> 

Above the RF analysis, FM 97.5MHz is not belonged to Malaysia, but this frequency can be belonged to Thailand radio station. In Kota Bharu, Thailand radio stations there are received from multiple transmitter site, such as:

1. Sungai Golok แม่น้ำโก-ลก

2. Narathiwat นราธิวาส

3. Tak Bai ตากใบ

4. Yala ยะลา (Khao Pokyo)

5. Sungai Padi สุไหงปาดี 

In Yala province, there is also a radio station using FM 97.5MHz, named 97.5 Modern Hit Peace FM, but this radio station is transmitted in Amphoe Mueang Yala (Tambon Sateng) where is capital of Yala province, instead of public radio stations' Khao Pokyo transmitter site. As 975 Peace FM is transmitted from Tambon Sateng, Yala province, Thailand, therefore it is impossible to be received in Kota Bharu, Malaysia.

Now we have ignored Yala as possibility of FM 97.5MHz transmitter site.

Next, we go for next RF analysis between Kelantan FM 97.3MHz Bukit Bakar and Thailand Narathiwat transmission sites.

1. Sungai Golok

97.3MHz: Kelantan FM Bukit Bakar

97.5MHz: Sungai Golok, Thailand

<200kHz>

2.  Sungai Padi

97.3MHz: Kelantan FM Bukit Bakar

97.5MHz: Sungai Padi, Thailand

<200kHz>

3. Narathiwat

97.3MHz: Kelantan FM Bukit Bakar

97.5MHz: Narathiwat, Thailand

<200kHz>

4. Tak Bai

97.3MHz: Kelantan FM Bukit Bakar

97.5MHz: Tak Bai, Thailand

<200kHz>

FM 97.5MHz has some static in Kota Bharu, Kelantan. The biggest possibility is a radio station testing transmission in Amphoe Mueang Narathiwat on FM 97.5MHz.

Tak Bai, Sungai Golok and Sungai Padi FM radio receptions in Kota Bharu, Kelantan, Malaysia are clear without static. 

If I compare with one existing radio frequency study between Bukit Bakar and Narathiwat, there has 200kHz frequency separation between both stations.

99.1MHz: Satthanii Witthayu 912 Narathiwat (สถานีวิทยุ 912)

99.3MHz: Ai FM Bukit Bakar

<200kHz>

Satthanii Witthayu 912 Narathiwat former frequency was FM 99.25MHz, but due to interference with Ai FM Bukit Bakar 99.3MHz, so it changed to FM 99.1MHz. 

In addition, Radio Thailand Narathiwat FM 98.25MHz has 250kHz frequency separation from Traxx FM 98.5MHz Bukit Bakar, and it has no problem for interference. Then,
Siang Phan Fa Narathiwat {เสียงผ่านฟ้านราธิวาส} FM 96.75MHz has 250kHz separation from Nasional FM 96.5MHz Bukit Bakar too.

About FM 97.5MHz unknown transmission in Kota Bharu, Malaysia, Narathiwat is the biggest possibility of transmission site for the frequency. For the radio station's content, we don't know yet because FM 97.5MHz does not officially hit its airwaves yet.

 

==FM 97.5MHz possibility==

Narathiwat>>Tak Bai>>Sungai Golok/Sungai Padi

Thanks to Senn Lens for uploading the video clips.